three#BufferAttribute JavaScript Examples

constructor( sphere, color = 0xffff00, angleSteps = 40 ) {

		const geometry = new BufferGeometry();
		const positions = [];
		for ( let i = 0; i < 3; i ++ ) {

			const axis1 = axes[ i ];
			const axis2 = axes[ ( i + 1 ) % 3 ];
			_vector.set( 0, 0, 0 );

			for ( let a = 0; a < angleSteps; a ++ ) {

				let angle;
				angle = 2 * Math.PI * a / ( angleSteps - 1 );
				_vector[ axis1 ] = Math.sin( angle );
				_vector[ axis2 ] = Math.cos( angle );

				positions.push( _vector.x, _vector.y, _vector.z );

				angle = 2 * Math.PI * ( a + 1 ) / ( angleSteps - 1 );
				_vector[ axis1 ] = Math.sin( angle );
				_vector[ axis2 ] = Math.cos( angle );

				positions.push( _vector.x, _vector.y, _vector.z );

			}


		}

		geometry.setAttribute( 'position', new BufferAttribute( new Float32Array( positions ), 3 ) );
		geometry.computeBoundingSphere();

		super( geometry, new LineBasicMaterial( { color: color, toneMapped: false } ) );
		this.sphere = sphere;
		this.type = 'SphereHelper';

	}

constructor() {
    const geometry = new BufferGeometry();
    const baPositions = new BufferAttribute(new Float32Array(24 * 3), 3);
    const baOpacities = new BufferAttribute(new Float32Array(24), 1);

    geometry.setAttribute('position', baPositions);
    geometry.setAttribute('opacity', baOpacities);

    const material = new RawShaderMaterial({
      vertexShader: vs,
      fragmentShader: fs,
      transparent: true
    });

    super(geometry, material);
  }

constructor() {
    const geometry = new BufferGeometry();
    const baPositions = new BufferAttribute(new Float32Array(17 * 3), 3);
    const baOpacities = new BufferAttribute(new Float32Array(17), 1);

    geometry.setAttribute('position', baPositions);
    geometry.setAttribute('opacity', baOpacities);

    const material = new RawShaderMaterial({
      vertexShader: vs,
      fragmentShader: fs,
      transparent: true
    });

    super(geometry, material);
  }

constructor() {
    // Define Geometry
    const geometry = new BufferGeometry();
    const baPositions = new BufferAttribute(new Float32Array(468 * 3), 3);
    const baIndices = new BufferAttribute(TRIANGULATION, 1);
    geometry.setAttribute('position', baPositions);
    geometry.setIndex(baIndices);

    // Define Material
    const material = new RawShaderMaterial({
      uniforms: {
        time: {
          value: 0
        },
        texture: {
          value: null
        }
      },
      vertexShader: vs,
      fragmentShader: fs,
      side: BackSide,
      transparent: true,
      blending: AdditiveBlending
    });

    super(geometry, material);
    this.size = new Vector2();
    this.imgRatio = new Vector2();
  }

/**
 * Returns a shared fullscreen triangle.
 *
 * The size of the screen is 2x2 units (NDC). A triangle that fills the screen
 * needs to be 4 units wide and 4 units tall.
 *
 * @private
 * @return {BufferGeometry} The fullscreen geometry.
 */

function getFullscreenTriangle() {

	if(geometry === null) {

		const vertices = new Float32Array([-1, -1, 0, 3, -1, 0, -1, 3, 0]);
		const uvs = new Float32Array([0, 0, 2, 0, 0, 2]);
		geometry = new BufferGeometry();

		// Added for backward compatibility (setAttribute was added in three r110).
		if(geometry.setAttribute !== undefined) {

			geometry.setAttribute("position", new BufferAttribute(vertices, 3));
			geometry.setAttribute("uv", new BufferAttribute(uvs, 2));

		} else {

			geometry.addAttribute("position", new BufferAttribute(vertices, 3));
			geometry.addAttribute("uv", new BufferAttribute(uvs, 2));

		}

	}

	return geometry;

}

createGeometry() {
    var trianglesCount =
      (this.lineShapeVertices.length - 1) * (this.blur ? 6 : 2);
    this.geometry = new BufferGeometry();
    this.positions = new Float32Array(trianglesCount * 3 * 3);
    // this.normals = new Float32Array(trianglesCount * 3 * 3);
    this.vertexColors = new Float32Array(trianglesCount * 3 * 4);

    var positionAttribute = new BufferAttribute(this.positions, 3);
    // var normalAttribute = new BufferAttribute(this.normals, 3);
    var colorAttribute = new BufferAttribute(this.vertexColors, 4);

    this.geometry.setAttribute('position', positionAttribute);
    // this.geometry.setAttribute('normal', normalAttribute);
    this.geometry.setAttribute('color', colorAttribute);
    this.geometry.computeBoundingSphere();
  }

function PositionalAudioHelper( audio, range, divisionsInnerAngle, divisionsOuterAngle ) {

	this.audio = audio;
	this.range = range || 1;
	this.divisionsInnerAngle = divisionsInnerAngle || 16;
	this.divisionsOuterAngle = divisionsOuterAngle || 2;

	var geometry = new BufferGeometry();
	var divisions = this.divisionsInnerAngle + this.divisionsOuterAngle * 2;
	var positions = new Float32Array( ( divisions * 3 + 3 ) * 3 );
	geometry.setAttribute( 'position', new BufferAttribute( positions, 3 ) );

	var materialInnerAngle = new LineBasicMaterial( { color: 0x00ff00 } );
	var materialOuterAngle = new LineBasicMaterial( { color: 0xffff00 } );

	Line.call( this, geometry, [ materialOuterAngle, materialInnerAngle ] );

	this.type = 'PositionalAudioHelper';

	this.update();

}

_createGeometry(geometryData) {
		try {
			var geometry = new BufferGeometry();
			var getBuffer = function (buf, type) {
				if (type === 'Uint8Array') {
					return new Uint8Array(buf);
				} else if (type === 'Uint16Array') {
					return new Uint16Array(buf);
				} else if (type === 'Uint32Array') {
					return new Uint32Array(buf);
				} else if (type === 'Int8Array') {
					return new Int8Array(buf);
				} else if (type === 'Int16Array') {
					return new Int16Array(buf);
				} else if (type === 'Int32Array') {
					return new Int32Array(buf);
				} else if (type === 'Float32Array') {
					return new Float32Array(buf);
				} else {
					return buf;
				}
			};
			if (geometryData.index) {
				geometry.setIndex(new BufferAttribute(getBuffer(geometryData.index.array, geometryData.indexType), 1));
			}

			for (var i = 0; i < geometryData.attributes.length; i++) {
				var attribute = geometryData.attributes[i];
				var name = attribute.name;
				var array = getBuffer(attribute.array, geometryData.attributeTypes[i]);
				var itemSize = attribute.itemSize;

				geometry.setAttribute(name, new BufferAttribute(array, itemSize));
			}
		} catch (e) {
			console.log('_createGeometry', e);
		}

		return geometry;
	}

addChunk (cellId, vert) {
    const geometry = new BufferGeometry()
    geometry.setAttribute('position', new BufferAttribute(new Float32Array(vert.positions), 3))
    geometry.setAttribute('normal', new BufferAttribute(new Float32Array(vert.normals), 3))
    geometry.setAttribute('uv', new BufferAttribute(new Float32Array(vert.uvs), 2))
    geometry.setAttribute('color', new BufferAttribute(new Float32Array(vert.colors), 3))
    geometry.matrixAutoUpdate = true

    const mesh = this.cellMesh.get(cellId)
    if (mesh === undefined) {
      const newMesh = new Mesh(geometry, this.game.world.material)
      newMesh.matrixAutoUpdate = true
      newMesh.frustumCulled = false
      newMesh.onAfterRender = () => {
        newMesh.frustumCulled = true
        newMesh.onAfterRender = function () {}
      }
      this.cellMesh.set(cellId, newMesh)
      this.game.scene.add(newMesh)
      if (this.smooth) {
        newMesh.position.y = -32
        const to = {
          y: 0
        }
        new TWEEN.Tween(newMesh.position)
          .to(to, 1000)
          .easing(TWEEN.Easing.Quadratic.Out)
          .onComplete(() => {
            newMesh.matrixAutoUpdate = true
            newMesh.geometry.matrixAutoUpdate = true
          })
          .start()
      }
      if (this.game.world.lastPlayerChunk !== null) {
        this.updateRenderOrder(JSON.parse(this.game.world.lastPlayerChunk))
      }
    } else {
      this.cellMesh.get(cellId).geometry = geometry
    }
  }

constructor(scene, world, options = {}) {
     this.scene = scene;
     this.world = world;
     this.options = options;
     this.debugDrawMode = options.debugDrawMode || AmmoDebugConstants.DrawWireframe;
     const drawOnTop = this.debugDrawMode & AmmoDebugConstants.DrawOnTop || false;
     const maxBufferSize = options.maxBufferSize || 1000000;
 
     this.geometry = new BufferGeometry()
     const vertices = new Float32Array(maxBufferSize * 3)
     const colors = new Float32Array(maxBufferSize * 3)
 
     /*
     I do not know the difference, just using the first one.
     export const StaticDrawUsage: Usage;
     export const DynamicDrawUsage: Usage;
     export const StreamDrawUsage: Usage;
     export const StaticReadUsage: Usage;
     export const DynamicReadUsage: Usage;
     export const StreamReadUsage: Usage;
     export const StaticCopyUsage: Usage;
     export const DynamicCopyUsage: Usage;
     export const StreamCopyUsage: Usage;
      */
     this.geometry.setAttribute('position', new BufferAttribute(vertices, 3).setUsage(StaticDrawUsage))
     this.geometry.setAttribute('color', new BufferAttribute(colors, 3).setUsage(StaticDrawUsage))
 
     this.index = 0
 
     const material = new LineBasicMaterial({
       vertexColors: true,
       depthTest: !drawOnTop
     });
 
     this.mesh = new LineSegments(this.geometry, material);
     if (drawOnTop) this.mesh.renderOrder = 999;
     this.mesh.frustumCulled = false;
 
     this.enabled = false;
 
     this.debugDrawer = new Ammo.DebugDrawer();
     this.debugDrawer.drawLine = this.drawLine.bind(this);
     this.debugDrawer.drawContactPoint = this.drawContactPoint.bind(this);
     this.debugDrawer.reportErrorWarning = this.reportErrorWarning.bind(this);
     this.debugDrawer.draw3dText = this.draw3dText.bind(this);
     this.debugDrawer.setDebugMode = this.setDebugMode.bind(this);
     this.debugDrawer.getDebugMode = this.getDebugMode.bind(this);
 
     this.world.setDebugDrawer(this.debugDrawer);
   }

setUv(arr) {
    const uvs = arr.reduce((pre, current) => {
      pre.push(...current);
      return pre;
    }, []);
    const baUvs = new BufferAttribute(new Float32Array(uvs), 2);
    this.geometry.setAttribute('uv', baUvs);
  }

constructor() {
    // Define Geometry
    const geometry = new BufferGeometry();

    // Define attributes of the geometry
    const baPositions = new BufferAttribute(new Float32Array(NUM * 3), 3);
    const baDelays = new BufferAttribute(new Float32Array(NUM), 1);
    const baStartY = new BufferAttribute(new Float32Array(NUM), 1);
    for (var i = 0, ul = NUM; i < ul; i++) {
      const radian = MathEx.radians(Math.random() * 360);
      const radius = Math.random() * 2 + 1;
      baPositions.setXYZ(
        i,
        Math.cos(radian) * radius,
        0,
        Math.sin(radian) * radius
      );
      baDelays.setX(i, Math.random() * DURATION);
      baStartY.setX(i, Math.random() * 1);
    }
    geometry.setAttribute('position', baPositions);
    geometry.setAttribute('delay', baDelays);
    geometry.setAttribute('startY', baStartY);

    // Define Material
    const material = new RawShaderMaterial({
      uniforms: {
        time: {
          value: 0
        },
        duration: {
          value: DURATION
        },
        noiseTex: {
          value: null
        },
        alphaShow: {
          value: 0
        },
        alphaHide: {
          value: 0
        }
      },
      vertexShader: vs,
      fragmentShader: fs,
      transparent: true,
      blending: AdditiveBlending,
      depthWrite: false
    });

    // Create Object3D
    super(geometry, material);
    this.name = 'FireBallPoints';
  }

parse( buffer ) {

		return super
			.parse( buffer )
			.then( result => {

				const { featureTable } = result;

				const POINTS_LENGTH = featureTable.getData( 'POINTS_LENGTH' );
				const POSITION = featureTable.getData( 'POSITION', POINTS_LENGTH, 'FLOAT', 'VEC3' );
				const RGB = featureTable.getData( 'RGB', POINTS_LENGTH, 'UNSIGNED_BYTE', 'VEC3' );

				[
					'QUANTIZED_VOLUME_OFFSET',
					'QUANTIZED_VOLUME_SCALE',
					'CONSTANT_RGBA',
					'BATCH_LENGTH',
					'POSITION_QUANTIZED',
					'RGBA',
					'RGB565',
					'NORMAL',
					'NORMAL_OCT16P',
				].forEach( feature => {

					if ( feature in featureTable.header ) {

						console.warn( `PNTSLoader: Unsupported FeatureTable feature "${ feature }" detected.` );

					}

				} );

				const geometry = new BufferGeometry();
				geometry.setAttribute( 'position', new BufferAttribute( POSITION, 3, false ) );

				const material = new PointsMaterial();
				material.size = 2;
				material.sizeAttenuation = false;

				if ( RGB !== null ) {

					geometry.setAttribute( 'color', new BufferAttribute( RGB, 3, true ) );
					material.vertexColors = true;

				}

				const object = new Points( geometry, material );
				result.scene = object;
				result.scene.featureTable = featureTable;

				const rtcCenter = featureTable.getData( 'RTC_CENTER' );

				if ( rtcCenter ) {

					result.scene.position.x += rtcCenter[ 0 ];
					result.scene.position.y += rtcCenter[ 1 ];
					result.scene.position.z += rtcCenter[ 2 ];

				}

				return result;

			} );

	}

GLTFLoader = ( function () {

	function GLTFLoader( manager ) {

		Loader.call( this, manager );

		this.dracoLoader = null;
		this.ddsLoader = null;

	}

	GLTFLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: GLTFLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			var scope = this;

			var resourcePath;

			if ( this.resourcePath !== '' ) {

				resourcePath = this.resourcePath;

			} else if ( this.path !== '' ) {

				resourcePath = this.path;

			} else {

				resourcePath = LoaderUtils.extractUrlBase( url );

			}

			// Tells the LoadingManager to track an extra item, which resolves after
			// the model is fully loaded. This means the count of items loaded will
			// be incorrect, but ensures manager.onLoad() does not fire early.
			scope.manager.itemStart( url );

			var _onError = function ( e ) {

				if ( onError ) {

					onError( e );

				} else {

					console.error( e );

				}

				scope.manager.itemError( url );
				scope.manager.itemEnd( url );

			};

			var loader = new FileLoader( scope.manager );

			loader.setPath( this.path );
			loader.setResponseType( 'arraybuffer' );

			if ( scope.crossOrigin === 'use-credentials' ) {

				loader.setWithCredentials( true );

			}

			loader.load( url, function ( data ) {

				try {

					scope.parse( data, resourcePath, function ( gltf ) {

						onLoad( gltf );

						scope.manager.itemEnd( url );

					}, _onError );

				} catch ( e ) {

					_onError( e );

				}

			}, onProgress, _onError );

		},

		setDRACOLoader: function ( dracoLoader ) {

			this.dracoLoader = dracoLoader;
			return this;

		},

		setDDSLoader: function ( ddsLoader ) {

			this.ddsLoader = ddsLoader;
			return this;

		},

		parse: function ( data, path, onLoad, onError ) {

			var content;
			var extensions = {};

			if ( typeof data === 'string' ) {

				content = data;

			} else {

				var magic = LoaderUtils.decodeText( new Uint8Array( data, 0, 4 ) );

				if ( magic === BINARY_EXTENSION_HEADER_MAGIC ) {

					try {

						extensions[ EXTENSIONS.KHR_BINARY_GLTF ] = new GLTFBinaryExtension( data );

					} catch ( error ) {

						if ( onError ) onError( error );
						return;

					}

					content = extensions[ EXTENSIONS.KHR_BINARY_GLTF ].content;

				} else {

					content = LoaderUtils.decodeText( new Uint8Array( data ) );

				}

			}

			var json = JSON.parse( content );

			if ( json.asset === undefined || json.asset.version[ 0 ] < 2 ) {

				if ( onError ) onError( new Error( 'THREE.GLTFLoader: Unsupported asset. glTF versions >=2.0 are supported.' ) );
				return;

			}

			if ( json.extensionsUsed ) {

				for ( var i = 0; i < json.extensionsUsed.length; ++ i ) {

					var extensionName = json.extensionsUsed[ i ];
					var extensionsRequired = json.extensionsRequired || [];

					switch ( extensionName ) {

						case EXTENSIONS.KHR_LIGHTS_PUNCTUAL:
							extensions[ extensionName ] = new GLTFLightsExtension( json );
							break;

						case EXTENSIONS.KHR_MATERIALS_CLEARCOAT:
							extensions[ extensionName ] = new GLTFMaterialsClearcoatExtension();
							break;

						case EXTENSIONS.KHR_MATERIALS_UNLIT:
							extensions[ extensionName ] = new GLTFMaterialsUnlitExtension();
							break;

						case EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS:
							extensions[ extensionName ] = new GLTFMaterialsPbrSpecularGlossinessExtension();
							break;

						case EXTENSIONS.KHR_DRACO_MESH_COMPRESSION:
							extensions[ extensionName ] = new GLTFDracoMeshCompressionExtension( json, this.dracoLoader );
							break;

						case EXTENSIONS.MSFT_TEXTURE_DDS:
							extensions[ extensionName ] = new GLTFTextureDDSExtension( this.ddsLoader );
							break;

						case EXTENSIONS.KHR_TEXTURE_TRANSFORM:
							extensions[ extensionName ] = new GLTFTextureTransformExtension();
							break;

						case EXTENSIONS.KHR_MESH_QUANTIZATION:
							extensions[ extensionName ] = new GLTFMeshQuantizationExtension();
							break;

						default:

							if ( extensionsRequired.indexOf( extensionName ) >= 0 ) {

								console.warn( 'THREE.GLTFLoader: Unknown extension "' + extensionName + '".' );

							}

					}

				}

			}

			var parser = new GLTFParser( json, extensions, {

				path: path || this.resourcePath || '',
				crossOrigin: this.crossOrigin,
				manager: this.manager

			} );

			parser.parse( onLoad, onError );

		}

	} );

	/* GLTFREGISTRY */

	function GLTFRegistry() {

		var objects = {};

		return	{

			get: function ( key ) {

				return objects[ key ];

			},

			add: function ( key, object ) {

				objects[ key ] = object;

			},

			remove: function ( key ) {

				delete objects[ key ];

			},

			removeAll: function () {

				objects = {};

			}

		};

	}

	/*********************************/
	/********** EXTENSIONS ***********/
	/*********************************/

	var EXTENSIONS = {
		KHR_BINARY_GLTF: 'KHR_binary_glTF',
		KHR_DRACO_MESH_COMPRESSION: 'KHR_draco_mesh_compression',
		KHR_LIGHTS_PUNCTUAL: 'KHR_lights_punctual',
		KHR_MATERIALS_CLEARCOAT: 'KHR_materials_clearcoat',
		KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS: 'KHR_materials_pbrSpecularGlossiness',
		KHR_MATERIALS_UNLIT: 'KHR_materials_unlit',
		KHR_TEXTURE_TRANSFORM: 'KHR_texture_transform',
		KHR_MESH_QUANTIZATION: 'KHR_mesh_quantization',
		MSFT_TEXTURE_DDS: 'MSFT_texture_dds'
	};

	/**
	 * DDS Texture Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/MSFT_texture_dds
	 *
	 */
	function GLTFTextureDDSExtension( ddsLoader ) {

		if ( ! ddsLoader ) {

			throw new Error( 'THREE.GLTFLoader: Attempting to load .dds texture without importing DDSLoader' );

		}

		this.name = EXTENSIONS.MSFT_TEXTURE_DDS;
		this.ddsLoader = ddsLoader;

	}

	/**
	 * Punctual Lights Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_lights_punctual
	 */
	function GLTFLightsExtension( json ) {

		this.name = EXTENSIONS.KHR_LIGHTS_PUNCTUAL;

		var extension = ( json.extensions && json.extensions[ EXTENSIONS.KHR_LIGHTS_PUNCTUAL ] ) || {};
		this.lightDefs = extension.lights || [];

	}

	GLTFLightsExtension.prototype.loadLight = function ( lightIndex ) {

		var lightDef = this.lightDefs[ lightIndex ];
		var lightNode;

		var color = new Color( 0xffffff );
		if ( lightDef.color !== undefined ) color.fromArray( lightDef.color );

		var range = lightDef.range !== undefined ? lightDef.range : 0;

		switch ( lightDef.type ) {

			case 'directional':
				lightNode = new DirectionalLight( color );
				lightNode.target.position.set( 0, 0, - 1 );
				lightNode.add( lightNode.target );
				break;

			case 'point':
				lightNode = new PointLight( color );
				lightNode.distance = range;
				break;

			case 'spot':
				lightNode = new SpotLight( color );
				lightNode.distance = range;
				// Handle spotlight properties.
				lightDef.spot = lightDef.spot || {};
				lightDef.spot.innerConeAngle = lightDef.spot.innerConeAngle !== undefined ? lightDef.spot.innerConeAngle : 0;
				lightDef.spot.outerConeAngle = lightDef.spot.outerConeAngle !== undefined ? lightDef.spot.outerConeAngle : Math.PI / 4.0;
				lightNode.angle = lightDef.spot.outerConeAngle;
				lightNode.penumbra = 1.0 - lightDef.spot.innerConeAngle / lightDef.spot.outerConeAngle;
				lightNode.target.position.set( 0, 0, - 1 );
				lightNode.add( lightNode.target );
				break;

			default:
				throw new Error( 'THREE.GLTFLoader: Unexpected light type, "' + lightDef.type + '".' );

		}

		// Some lights (e.g. spot) default to a position other than the origin. Reset the position
		// here, because node-level parsing will only override position if explicitly specified.
		lightNode.position.set( 0, 0, 0 );

		lightNode.decay = 2;

		if ( lightDef.intensity !== undefined ) lightNode.intensity = lightDef.intensity;

		lightNode.name = lightDef.name || ( 'light_' + lightIndex );

		return Promise.resolve( lightNode );

	};

	/**
	 * Unlit Materials Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_unlit
	 */
	function GLTFMaterialsUnlitExtension() {

		this.name = EXTENSIONS.KHR_MATERIALS_UNLIT;

	}

	GLTFMaterialsUnlitExtension.prototype.getMaterialType = function () {

		return MeshBasicMaterial;

	};

	GLTFMaterialsUnlitExtension.prototype.extendParams = function ( materialParams, materialDef, parser ) {

		var pending = [];

		materialParams.color = new Color( 1.0, 1.0, 1.0 );
		materialParams.opacity = 1.0;

		var metallicRoughness = materialDef.pbrMetallicRoughness;

		if ( metallicRoughness ) {

			if ( Array.isArray( metallicRoughness.baseColorFactor ) ) {

				var array = metallicRoughness.baseColorFactor;

				materialParams.color.fromArray( array );
				materialParams.opacity = array[ 3 ];

			}

			if ( metallicRoughness.baseColorTexture !== undefined ) {

				pending.push( parser.assignTexture( materialParams, 'map', metallicRoughness.baseColorTexture ) );

			}

		}

		return Promise.all( pending );

	};

	/**
	 * Clearcoat Materials Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_clearcoat
	 */
	function GLTFMaterialsClearcoatExtension() {

		this.name = EXTENSIONS.KHR_MATERIALS_CLEARCOAT;

	}

	GLTFMaterialsClearcoatExtension.prototype.getMaterialType = function () {

		return MeshPhysicalMaterial;

	};

	GLTFMaterialsClearcoatExtension.prototype.extendParams = function ( materialParams, materialDef, parser ) {

		var pending = [];

		var extension = materialDef.extensions[ this.name ];

		if ( extension.clearcoatFactor !== undefined ) {

			materialParams.clearcoat = extension.clearcoatFactor;

		}

		if ( extension.clearcoatTexture !== undefined ) {

			pending.push( parser.assignTexture( materialParams, 'clearcoatMap', extension.clearcoatTexture ) );

		}

		if ( extension.clearcoatRoughnessFactor !== undefined ) {

			materialParams.clearcoatRoughness = extension.clearcoatRoughnessFactor;

		}

		if ( extension.clearcoatRoughnessTexture !== undefined ) {

			pending.push( parser.assignTexture( materialParams, 'clearcoatRoughnessMap', extension.clearcoatRoughnessTexture ) );

		}

		if ( extension.clearcoatNormalTexture !== undefined ) {

			pending.push( parser.assignTexture( materialParams, 'clearcoatNormalMap', extension.clearcoatNormalTexture ) );

			if ( extension.clearcoatNormalTexture.scale !== undefined ) {

				var scale = extension.clearcoatNormalTexture.scale;

				materialParams.clearcoatNormalScale = new Vector2( scale, scale );

			}

		}

		return Promise.all( pending );

	};

	/* BINARY EXTENSION */
	var BINARY_EXTENSION_HEADER_MAGIC = 'glTF';
	var BINARY_EXTENSION_HEADER_LENGTH = 12;
	var BINARY_EXTENSION_CHUNK_TYPES = { JSON: 0x4E4F534A, BIN: 0x004E4942 };

	function GLTFBinaryExtension( data ) {

		this.name = EXTENSIONS.KHR_BINARY_GLTF;
		this.content = null;
		this.body = null;

		var headerView = new DataView( data, 0, BINARY_EXTENSION_HEADER_LENGTH );

		this.header = {
			magic: LoaderUtils.decodeText( new Uint8Array( data.slice( 0, 4 ) ) ),
			version: headerView.getUint32( 4, true ),
			length: headerView.getUint32( 8, true )
		};

		if ( this.header.magic !== BINARY_EXTENSION_HEADER_MAGIC ) {

			throw new Error( 'THREE.GLTFLoader: Unsupported glTF-Binary header.' );

		} else if ( this.header.version < 2.0 ) {

			throw new Error( 'THREE.GLTFLoader: Legacy binary file detected.' );

		}

		var chunkView = new DataView( data, BINARY_EXTENSION_HEADER_LENGTH );
		var chunkIndex = 0;

		while ( chunkIndex < chunkView.byteLength ) {

			var chunkLength = chunkView.getUint32( chunkIndex, true );
			chunkIndex += 4;

			var chunkType = chunkView.getUint32( chunkIndex, true );
			chunkIndex += 4;

			if ( chunkType === BINARY_EXTENSION_CHUNK_TYPES.JSON ) {

				var contentArray = new Uint8Array( data, BINARY_EXTENSION_HEADER_LENGTH + chunkIndex, chunkLength );
				this.content = LoaderUtils.decodeText( contentArray );

			} else if ( chunkType === BINARY_EXTENSION_CHUNK_TYPES.BIN ) {

				var byteOffset = BINARY_EXTENSION_HEADER_LENGTH + chunkIndex;
				this.body = data.slice( byteOffset, byteOffset + chunkLength );

			}

			// Clients must ignore chunks with unknown types.

			chunkIndex += chunkLength;

		}

		if ( this.content === null ) {

			throw new Error( 'THREE.GLTFLoader: JSON content not found.' );

		}

	}

	/**
	 * DRACO Mesh Compression Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_draco_mesh_compression
	 */
	function GLTFDracoMeshCompressionExtension( json, dracoLoader ) {

		if ( ! dracoLoader ) {

			throw new Error( 'THREE.GLTFLoader: No DRACOLoader instance provided.' );

		}

		this.name = EXTENSIONS.KHR_DRACO_MESH_COMPRESSION;
		this.json = json;
		this.dracoLoader = dracoLoader;
		this.dracoLoader.preload();

	}

	GLTFDracoMeshCompressionExtension.prototype.decodePrimitive = function ( primitive, parser ) {

		var json = this.json;
		var dracoLoader = this.dracoLoader;
		var bufferViewIndex = primitive.extensions[ this.name ].bufferView;
		var gltfAttributeMap = primitive.extensions[ this.name ].attributes;
		var threeAttributeMap = {};
		var attributeNormalizedMap = {};
		var attributeTypeMap = {};

		for ( var attributeName in gltfAttributeMap ) {

			var threeAttributeName = ATTRIBUTES[ attributeName ] || attributeName.toLowerCase();

			threeAttributeMap[ threeAttributeName ] = gltfAttributeMap[ attributeName ];

		}

		for ( attributeName in primitive.attributes ) {

			var threeAttributeName = ATTRIBUTES[ attributeName ] || attributeName.toLowerCase();

			if ( gltfAttributeMap[ attributeName ] !== undefined ) {

				var accessorDef = json.accessors[ primitive.attributes[ attributeName ] ];
				var componentType = WEBGL_COMPONENT_TYPES[ accessorDef.componentType ];

				attributeTypeMap[ threeAttributeName ] = componentType;
				attributeNormalizedMap[ threeAttributeName ] = accessorDef.normalized === true;

			}

		}

		return parser.getDependency( 'bufferView', bufferViewIndex ).then( function ( bufferView ) {

			return new Promise( function ( resolve ) {

				dracoLoader.decodeDracoFile( bufferView, function ( geometry ) {

					for ( var attributeName in geometry.attributes ) {

						var attribute = geometry.attributes[ attributeName ];
						var normalized = attributeNormalizedMap[ attributeName ];

						if ( normalized !== undefined ) attribute.normalized = normalized;

					}

					resolve( geometry );

				}, threeAttributeMap, attributeTypeMap );

			} );

		} );

	};

	/**
	 * Texture Transform Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_texture_transform
	 */
	function GLTFTextureTransformExtension() {

		this.name = EXTENSIONS.KHR_TEXTURE_TRANSFORM;

	}

	GLTFTextureTransformExtension.prototype.extendTexture = function ( texture, transform ) {

		texture = texture.clone();

		if ( transform.offset !== undefined ) {

			texture.offset.fromArray( transform.offset );

		}

		if ( transform.rotation !== undefined ) {

			texture.rotation = transform.rotation;

		}

		if ( transform.scale !== undefined ) {

			texture.repeat.fromArray( transform.scale );

		}

		if ( transform.texCoord !== undefined ) {

			console.warn( 'THREE.GLTFLoader: Custom UV sets in "' + this.name + '" extension not yet supported.' );

		}

		texture.needsUpdate = true;

		return texture;

	};

	/**
	 * Specular-Glossiness Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_pbrSpecularGlossiness
	 */

	/**
	 * A sub class of StandardMaterial with some of the functionality
	 * changed via the `onBeforeCompile` callback
	 * @pailhead
	 */

	function GLTFMeshStandardSGMaterial( params ) {

		MeshStandardMaterial.call( this );

		this.isGLTFSpecularGlossinessMaterial = true;

		//various chunks that need replacing
		var specularMapParsFragmentChunk = [
			'#ifdef USE_SPECULARMAP',
			'	uniform sampler2D specularMap;',
			'#endif'
		].join( '\n' );

		var glossinessMapParsFragmentChunk = [
			'#ifdef USE_GLOSSINESSMAP',
			'	uniform sampler2D glossinessMap;',
			'#endif'
		].join( '\n' );

		var specularMapFragmentChunk = [
			'vec3 specularFactor = specular;',
			'#ifdef USE_SPECULARMAP',
			'	vec4 texelSpecular = texture2D( specularMap, vUv );',
			'	texelSpecular = sRGBToLinear( texelSpecular );',
			'	// reads channel RGB, compatible with a glTF Specular-Glossiness (RGBA) texture',
			'	specularFactor *= texelSpecular.rgb;',
			'#endif'
		].join( '\n' );

		var glossinessMapFragmentChunk = [
			'float glossinessFactor = glossiness;',
			'#ifdef USE_GLOSSINESSMAP',
			'	vec4 texelGlossiness = texture2D( glossinessMap, vUv );',
			'	// reads channel A, compatible with a glTF Specular-Glossiness (RGBA) texture',
			'	glossinessFactor *= texelGlossiness.a;',
			'#endif'
		].join( '\n' );

		var lightPhysicalFragmentChunk = [
			'PhysicalMaterial material;',
			'material.diffuseColor = diffuseColor.rgb;',
			'vec3 dxy = max( abs( dFdx( geometryNormal ) ), abs( dFdy( geometryNormal ) ) );',
			'float geometryRoughness = max( max( dxy.x, dxy.y ), dxy.z );',
			'material.specularRoughness = max( 1.0 - glossinessFactor, 0.0525 );// 0.0525 corresponds to the base mip of a 256 cubemap.',
			'material.specularRoughness += geometryRoughness;',
			'material.specularRoughness = min( material.specularRoughness, 1.0 );',
			'material.specularColor = specularFactor.rgb;',
		].join( '\n' );

		var uniforms = {
			specular: { value: new Color().setHex( 0xffffff ) },
			glossiness: { value: 1 },
			specularMap: { value: null },
			glossinessMap: { value: null }
		};

		this._extraUniforms = uniforms;

		// please see #14031 or #13198 for an alternate approach
		this.onBeforeCompile = function ( shader ) {

			for ( var uniformName in uniforms ) {

				shader.uniforms[ uniformName ] = uniforms[ uniformName ];

			}

			shader.fragmentShader = shader.fragmentShader.replace( 'uniform float roughness;', 'uniform vec3 specular;' );
			shader.fragmentShader = shader.fragmentShader.replace( 'uniform float metalness;', 'uniform float glossiness;' );
			shader.fragmentShader = shader.fragmentShader.replace( '#include <roughnessmap_pars_fragment>', specularMapParsFragmentChunk );
			shader.fragmentShader = shader.fragmentShader.replace( '#include <metalnessmap_pars_fragment>', glossinessMapParsFragmentChunk );
			shader.fragmentShader = shader.fragmentShader.replace( '#include <roughnessmap_fragment>', specularMapFragmentChunk );
			shader.fragmentShader = shader.fragmentShader.replace( '#include <metalnessmap_fragment>', glossinessMapFragmentChunk );
			shader.fragmentShader = shader.fragmentShader.replace( '#include <lights_physical_fragment>', lightPhysicalFragmentChunk );

		};

		/*eslint-disable*/
		Object.defineProperties(
			this,
			{
				specular: {
					get: function () { return uniforms.specular.value; },
					set: function ( v ) { uniforms.specular.value = v; }
				},
				specularMap: {
					get: function () { return uniforms.specularMap.value; },
					set: function ( v ) { uniforms.specularMap.value = v; }
				},
				glossiness: {
					get: function () { return uniforms.glossiness.value; },
					set: function ( v ) { uniforms.glossiness.value = v; }
				},
				glossinessMap: {
					get: function () { return uniforms.glossinessMap.value; },
					set: function ( v ) {

						uniforms.glossinessMap.value = v;
						//how about something like this - @pailhead
						if ( v ) {

							this.defines.USE_GLOSSINESSMAP = '';
							// set USE_ROUGHNESSMAP to enable vUv
							this.defines.USE_ROUGHNESSMAP = '';

						} else {

							delete this.defines.USE_ROUGHNESSMAP;
							delete this.defines.USE_GLOSSINESSMAP;

						}

					}
				}
			}
		);

		/*eslint-enable*/
		delete this.metalness;
		delete this.roughness;
		delete this.metalnessMap;
		delete this.roughnessMap;

		this.setValues( params );

	}

	GLTFMeshStandardSGMaterial.prototype = Object.create( MeshStandardMaterial.prototype );
	GLTFMeshStandardSGMaterial.prototype.constructor = GLTFMeshStandardSGMaterial;

	GLTFMeshStandardSGMaterial.prototype.copy = function ( source ) {

		MeshStandardMaterial.prototype.copy.call( this, source );
		this.specularMap = source.specularMap;
		this.specular.copy( source.specular );
		this.glossinessMap = source.glossinessMap;
		this.glossiness = source.glossiness;
		delete this.metalness;
		delete this.roughness;
		delete this.metalnessMap;
		delete this.roughnessMap;
		return this;

	};

	function GLTFMaterialsPbrSpecularGlossinessExtension() {

		return {

			name: EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS,

			specularGlossinessParams: [
				'color',
				'map',
				'lightMap',
				'lightMapIntensity',
				'aoMap',
				'aoMapIntensity',
				'emissive',
				'emissiveIntensity',
				'emissiveMap',
				'bumpMap',
				'bumpScale',
				'normalMap',
				'normalMapType',
				'displacementMap',
				'displacementScale',
				'displacementBias',
				'specularMap',
				'specular',
				'glossinessMap',
				'glossiness',
				'alphaMap',
				'envMap',
				'envMapIntensity',
				'refractionRatio',
			],

			getMaterialType: function () {

				return GLTFMeshStandardSGMaterial;

			},

			extendParams: function ( materialParams, materialDef, parser ) {

				var pbrSpecularGlossiness = materialDef.extensions[ this.name ];

				materialParams.color = new Color( 1.0, 1.0, 1.0 );
				materialParams.opacity = 1.0;

				var pending = [];

				if ( Array.isArray( pbrSpecularGlossiness.diffuseFactor ) ) {

					var array = pbrSpecularGlossiness.diffuseFactor;

					materialParams.color.fromArray( array );
					materialParams.opacity = array[ 3 ];

				}

				if ( pbrSpecularGlossiness.diffuseTexture !== undefined ) {

					pending.push( parser.assignTexture( materialParams, 'map', pbrSpecularGlossiness.diffuseTexture ) );

				}

				materialParams.emissive = new Color( 0.0, 0.0, 0.0 );
				materialParams.glossiness = pbrSpecularGlossiness.glossinessFactor !== undefined ? pbrSpecularGlossiness.glossinessFactor : 1.0;
				materialParams.specular = new Color( 1.0, 1.0, 1.0 );

				if ( Array.isArray( pbrSpecularGlossiness.specularFactor ) ) {

					materialParams.specular.fromArray( pbrSpecularGlossiness.specularFactor );

				}

				if ( pbrSpecularGlossiness.specularGlossinessTexture !== undefined ) {

					var specGlossMapDef = pbrSpecularGlossiness.specularGlossinessTexture;
					pending.push( parser.assignTexture( materialParams, 'glossinessMap', specGlossMapDef ) );
					pending.push( parser.assignTexture( materialParams, 'specularMap', specGlossMapDef ) );

				}

				return Promise.all( pending );

			},

			createMaterial: function ( materialParams ) {

				var material = new GLTFMeshStandardSGMaterial( materialParams );
				material.fog = true;

				material.color = materialParams.color;

				material.map = materialParams.map === undefined ? null : materialParams.map;

				material.lightMap = null;
				material.lightMapIntensity = 1.0;

				material.aoMap = materialParams.aoMap === undefined ? null : materialParams.aoMap;
				material.aoMapIntensity = 1.0;

				material.emissive = materialParams.emissive;
				material.emissiveIntensity = 1.0;
				material.emissiveMap = materialParams.emissiveMap === undefined ? null : materialParams.emissiveMap;

				material.bumpMap = materialParams.bumpMap === undefined ? null : materialParams.bumpMap;
				material.bumpScale = 1;

				material.normalMap = materialParams.normalMap === undefined ? null : materialParams.normalMap;
				material.normalMapType = TangentSpaceNormalMap;

				if ( materialParams.normalScale ) material.normalScale = materialParams.normalScale;

				material.displacementMap = null;
				material.displacementScale = 1;
				material.displacementBias = 0;

				material.specularMap = materialParams.specularMap === undefined ? null : materialParams.specularMap;
				material.specular = materialParams.specular;

				material.glossinessMap = materialParams.glossinessMap === undefined ? null : materialParams.glossinessMap;
				material.glossiness = materialParams.glossiness;

				material.alphaMap = null;

				material.envMap = materialParams.envMap === undefined ? null : materialParams.envMap;
				material.envMapIntensity = 1.0;

				material.refractionRatio = 0.98;

				return material;

			},

		};

	}

	/**
	 * Mesh Quantization Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_mesh_quantization
	 */
	function GLTFMeshQuantizationExtension() {

		this.name = EXTENSIONS.KHR_MESH_QUANTIZATION;

	}

	/*********************************/
	/********** INTERPOLATION ********/
	/*********************************/

	// Spline Interpolation
	// Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#appendix-c-spline-interpolation
	function GLTFCubicSplineInterpolant( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

		Interpolant.call( this, parameterPositions, sampleValues, sampleSize, resultBuffer );

	}

	GLTFCubicSplineInterpolant.prototype = Object.create( Interpolant.prototype );
	GLTFCubicSplineInterpolant.prototype.constructor = GLTFCubicSplineInterpolant;

	GLTFCubicSplineInterpolant.prototype.copySampleValue_ = function ( index ) {

		// Copies a sample value to the result buffer. See description of glTF
		// CUBICSPLINE values layout in interpolate_() function below.

		var result = this.resultBuffer,
			values = this.sampleValues,
			valueSize = this.valueSize,
			offset = index * valueSize * 3 + valueSize;

		for ( var i = 0; i !== valueSize; i ++ ) {

			result[ i ] = values[ offset + i ];

		}

		return result;

	};

	GLTFCubicSplineInterpolant.prototype.beforeStart_ = GLTFCubicSplineInterpolant.prototype.copySampleValue_;

	GLTFCubicSplineInterpolant.prototype.afterEnd_ = GLTFCubicSplineInterpolant.prototype.copySampleValue_;

	GLTFCubicSplineInterpolant.prototype.interpolate_ = function ( i1, t0, t, t1 ) {

		var result = this.resultBuffer;
		var values = this.sampleValues;
		var stride = this.valueSize;

		var stride2 = stride * 2;
		var stride3 = stride * 3;

		var td = t1 - t0;

		var p = ( t - t0 ) / td;
		var pp = p * p;
		var ppp = pp * p;

		var offset1 = i1 * stride3;
		var offset0 = offset1 - stride3;

		var s2 = - 2 * ppp + 3 * pp;
		var s3 = ppp - pp;
		var s0 = 1 - s2;
		var s1 = s3 - pp + p;

		// Layout of keyframe output values for CUBICSPLINE animations:
		//   [ inTangent_1, splineVertex_1, outTangent_1, inTangent_2, splineVertex_2, ... ]
		for ( var i = 0; i !== stride; i ++ ) {

			var p0 = values[ offset0 + i + stride ]; // splineVertex_k
			var m0 = values[ offset0 + i + stride2 ] * td; // outTangent_k * (t_k+1 - t_k)
			var p1 = values[ offset1 + i + stride ]; // splineVertex_k+1
			var m1 = values[ offset1 + i ] * td; // inTangent_k+1 * (t_k+1 - t_k)

			result[ i ] = s0 * p0 + s1 * m0 + s2 * p1 + s3 * m1;

		}

		return result;

	};

	/*********************************/
	/********** INTERNALS ************/
	/*********************************/

	/* CONSTANTS */

	var WEBGL_CONSTANTS = {
		FLOAT: 5126,
		//FLOAT_MAT2: 35674,
		FLOAT_MAT3: 35675,
		FLOAT_MAT4: 35676,
		FLOAT_VEC2: 35664,
		FLOAT_VEC3: 35665,
		FLOAT_VEC4: 35666,
		LINEAR: 9729,
		REPEAT: 10497,
		SAMPLER_2D: 35678,
		POINTS: 0,
		LINES: 1,
		LINE_LOOP: 2,
		LINE_STRIP: 3,
		TRIANGLES: 4,
		TRIANGLE_STRIP: 5,
		TRIANGLE_FAN: 6,
		UNSIGNED_BYTE: 5121,
		UNSIGNED_SHORT: 5123
	};

	var WEBGL_COMPONENT_TYPES = {
		5120: Int8Array,
		5121: Uint8Array,
		5122: Int16Array,
		5123: Uint16Array,
		5125: Uint32Array,
		5126: Float32Array
	};

	var WEBGL_FILTERS = {
		9728: NearestFilter,
		9729: LinearFilter,
		9984: NearestMipmapNearestFilter,
		9985: LinearMipmapNearestFilter,
		9986: NearestMipmapLinearFilter,
		9987: LinearMipmapLinearFilter
	};

	var WEBGL_WRAPPINGS = {
		33071: ClampToEdgeWrapping,
		33648: MirroredRepeatWrapping,
		10497: RepeatWrapping
	};

	var WEBGL_TYPE_SIZES = {
		'SCALAR': 1,
		'VEC2': 2,
		'VEC3': 3,
		'VEC4': 4,
		'MAT2': 4,
		'MAT3': 9,
		'MAT4': 16
	};

	var ATTRIBUTES = {
		POSITION: 'position',
		NORMAL: 'normal',
		TANGENT: 'tangent',
		TEXCOORD_0: 'uv',
		TEXCOORD_1: 'uv2',
		COLOR_0: 'color',
		WEIGHTS_0: 'skinWeight',
		JOINTS_0: 'skinIndex',
	};

	var PATH_PROPERTIES = {
		scale: 'scale',
		translation: 'position',
		rotation: 'quaternion',
		weights: 'morphTargetInfluences'
	};

	var INTERPOLATION = {
		CUBICSPLINE: undefined, // We use a custom interpolant (GLTFCubicSplineInterpolation) for CUBICSPLINE tracks. Each
		                        // keyframe track will be initialized with a default interpolation type, then modified.
		LINEAR: InterpolateLinear,
		STEP: InterpolateDiscrete
	};

	var ALPHA_MODES = {
		OPAQUE: 'OPAQUE',
		MASK: 'MASK',
		BLEND: 'BLEND'
	};

	var MIME_TYPE_FORMATS = {
		'image/png': RGBAFormat,
		'image/jpeg': RGBFormat
	};

	/* UTILITY FUNCTIONS */

	function resolveURL( url, path ) {

		// Invalid URL
		if ( typeof url !== 'string' || url === '' ) return '';

		// Host Relative URL
		if ( /^https?:\/\//i.test( path ) && /^\//.test( url ) ) {

			path = path.replace( /(^https?:\/\/[^\/]+).*/i, '$1' );

		}

		// Absolute URL http://,https://,//
		if ( /^(https?:)?\/\//i.test( url ) ) return url;

		// Data URI
		if ( /^data:.*,.*$/i.test( url ) ) return url;

		// Blob URL
		if ( /^blob:.*$/i.test( url ) ) return url;

		// Relative URL
		return path + url;

	}

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#default-material
	 */
	function createDefaultMaterial( cache ) {

		if ( cache[ 'DefaultMaterial' ] === undefined ) {

			cache[ 'DefaultMaterial' ] = new MeshStandardMaterial( {
				color: 0xFFFFFF,
				emissive: 0x000000,
				metalness: 1,
				roughness: 1,
				transparent: false,
				depthTest: true,
				side: FrontSide
			} );

		}

		return cache[ 'DefaultMaterial' ];

	}

	function addUnknownExtensionsToUserData( knownExtensions, object, objectDef ) {

		// Add unknown glTF extensions to an object's userData.

		for ( var name in objectDef.extensions ) {

			if ( knownExtensions[ name ] === undefined ) {

				object.userData.gltfExtensions = object.userData.gltfExtensions || {};
				object.userData.gltfExtensions[ name ] = objectDef.extensions[ name ];

			}

		}

	}

	/**
	 * @param {Object3D|Material|BufferGeometry} object
	 * @param {GLTF.definition} gltfDef
	 */
	function assignExtrasToUserData( object, gltfDef ) {

		if ( gltfDef.extras !== undefined ) {

			if ( typeof gltfDef.extras === 'object' ) {

				Object.assign( object.userData, gltfDef.extras );

			} else {

				console.warn( 'THREE.GLTFLoader: Ignoring primitive type .extras, ' + gltfDef.extras );

			}

		}

	}

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#morph-targets
	 *
	 * @param {BufferGeometry} geometry
	 * @param {Array<GLTF.Target>} targets
	 * @param {GLTFParser} parser
	 * @return {Promise<BufferGeometry>}
	 */
	function addMorphTargets( geometry, targets, parser ) {

		var hasMorphPosition = false;
		var hasMorphNormal = false;

		for ( var i = 0, il = targets.length; i < il; i ++ ) {

			var target = targets[ i ];

			if ( target.POSITION !== undefined ) hasMorphPosition = true;
			if ( target.NORMAL !== undefined ) hasMorphNormal = true;

			if ( hasMorphPosition && hasMorphNormal ) break;

		}

		if ( ! hasMorphPosition && ! hasMorphNormal ) return Promise.resolve( geometry );

		var pendingPositionAccessors = [];
		var pendingNormalAccessors = [];

		for ( var i = 0, il = targets.length; i < il; i ++ ) {

			var target = targets[ i ];

			if ( hasMorphPosition ) {

				var pendingAccessor = target.POSITION !== undefined
					? parser.getDependency( 'accessor', target.POSITION )
					: geometry.attributes.position;

				pendingPositionAccessors.push( pendingAccessor );

			}

			if ( hasMorphNormal ) {

				var pendingAccessor = target.NORMAL !== undefined
					? parser.getDependency( 'accessor', target.NORMAL )
					: geometry.attributes.normal;

				pendingNormalAccessors.push( pendingAccessor );

			}

		}

		return Promise.all( [
			Promise.all( pendingPositionAccessors ),
			Promise.all( pendingNormalAccessors )
		] ).then( function ( accessors ) {

			var morphPositions = accessors[ 0 ];
			var morphNormals = accessors[ 1 ];

			if ( hasMorphPosition ) geometry.morphAttributes.position = morphPositions;
			if ( hasMorphNormal ) geometry.morphAttributes.normal = morphNormals;
			geometry.morphTargetsRelative = true;

			return geometry;

		} );

	}

	/**
	 * @param {Mesh} mesh
	 * @param {GLTF.Mesh} meshDef
	 */
	function updateMorphTargets( mesh, meshDef ) {

		mesh.updateMorphTargets();

		if ( meshDef.weights !== undefined ) {

			for ( var i = 0, il = meshDef.weights.length; i < il; i ++ ) {

				mesh.morphTargetInfluences[ i ] = meshDef.weights[ i ];

			}

		}

		// .extras has user-defined data, so check that .extras.targetNames is an array.
		if ( meshDef.extras && Array.isArray( meshDef.extras.targetNames ) ) {

			var targetNames = meshDef.extras.targetNames;

			if ( mesh.morphTargetInfluences.length === targetNames.length ) {

				mesh.morphTargetDictionary = {};

				for ( var i = 0, il = targetNames.length; i < il; i ++ ) {

					mesh.morphTargetDictionary[ targetNames[ i ] ] = i;

				}

			} else {

				console.warn( 'THREE.GLTFLoader: Invalid extras.targetNames length. Ignoring names.' );

			}

		}

	}

	function createPrimitiveKey( primitiveDef ) {

		var dracoExtension = primitiveDef.extensions && primitiveDef.extensions[ EXTENSIONS.KHR_DRACO_MESH_COMPRESSION ];
		var geometryKey;

		if ( dracoExtension ) {

			geometryKey = 'draco:' + dracoExtension.bufferView
				+ ':' + dracoExtension.indices
				+ ':' + createAttributesKey( dracoExtension.attributes );

		} else {

			geometryKey = primitiveDef.indices + ':' + createAttributesKey( primitiveDef.attributes ) + ':' + primitiveDef.mode;

		}

		return geometryKey;

	}

	function createAttributesKey( attributes ) {

		var attributesKey = '';

		var keys = Object.keys( attributes ).sort();

		for ( var i = 0, il = keys.length; i < il; i ++ ) {

			attributesKey += keys[ i ] + ':' + attributes[ keys[ i ] ] + ';';

		}

		return attributesKey;

	}

	/* GLTF PARSER */

	function GLTFParser( json, extensions, options ) {

		this.json = json || {};
		this.extensions = extensions || {};
		this.options = options || {};

		// loader object cache
		this.cache = new GLTFRegistry();

		// BufferGeometry caching
		this.primitiveCache = {};

		this.textureLoader = new TextureLoader( this.options.manager );
		this.textureLoader.setCrossOrigin( this.options.crossOrigin );

		this.fileLoader = new FileLoader( this.options.manager );
		this.fileLoader.setResponseType( 'arraybuffer' );

		if ( this.options.crossOrigin === 'use-credentials' ) {

			this.fileLoader.setWithCredentials( true );

		}

	}

	GLTFParser.prototype.parse = function ( onLoad, onError ) {

		var parser = this;
		var json = this.json;
		var extensions = this.extensions;

		// Clear the loader cache
		this.cache.removeAll();

		// Mark the special nodes/meshes in json for efficient parse
		this.markDefs();

		Promise.all( [

			this.getDependencies( 'scene' ),
			this.getDependencies( 'animation' ),
			this.getDependencies( 'camera' ),

		] ).then( function ( dependencies ) {

			var result = {
				scene: dependencies[ 0 ][ json.scene || 0 ],
				scenes: dependencies[ 0 ],
				animations: dependencies[ 1 ],
				cameras: dependencies[ 2 ],
				asset: json.asset,
				parser: parser,
				userData: {}
			};

			addUnknownExtensionsToUserData( extensions, result, json );

			assignExtrasToUserData( result, json );

			onLoad( result );

		} ).catch( onError );

	};

	/**
	 * Marks the special nodes/meshes in json for efficient parse.
	 */
	GLTFParser.prototype.markDefs = function () {

		var nodeDefs = this.json.nodes || [];
		var skinDefs = this.json.skins || [];
		var meshDefs = this.json.meshes || [];

		var meshReferences = {};
		var meshUses = {};

		// Nothing in the node definition indicates whether it is a Bone or an
		// Object3D. Use the skins' joint references to mark bones.
		for ( var skinIndex = 0, skinLength = skinDefs.length; skinIndex < skinLength; skinIndex ++ ) {

			var joints = skinDefs[ skinIndex ].joints;

			for ( var i = 0, il = joints.length; i < il; i ++ ) {

				nodeDefs[ joints[ i ] ].isBone = true;

			}

		}

		// Meshes can (and should) be reused by multiple nodes in a glTF asset. To
		// avoid having more than one Mesh with the same name, count
		// references and rename instances below.
		//
		// Example: CesiumMilkTruck sample model reuses "Wheel" meshes.
		for ( var nodeIndex = 0, nodeLength = nodeDefs.length; nodeIndex < nodeLength; nodeIndex ++ ) {

			var nodeDef = nodeDefs[ nodeIndex ];

			if ( nodeDef.mesh !== undefined ) {

				if ( meshReferences[ nodeDef.mesh ] === undefined ) {

					meshReferences[ nodeDef.mesh ] = meshUses[ nodeDef.mesh ] = 0;

				}

				meshReferences[ nodeDef.mesh ] ++;

				// Nothing in the mesh definition indicates whether it is
				// a SkinnedMesh or Mesh. Use the node's mesh reference
				// to mark SkinnedMesh if node has skin.
				if ( nodeDef.skin !== undefined ) {

					meshDefs[ nodeDef.mesh ].isSkinnedMesh = true;

				}

			}

		}

		this.json.meshReferences = meshReferences;
		this.json.meshUses = meshUses;

	};

	/**
	 * Requests the specified dependency asynchronously, with caching.
	 * @param {string} type
	 * @param {number} index
	 * @return {Promise<Object3D|Material|THREE.Texture|AnimationClip|ArrayBuffer|Object>}
	 */
	GLTFParser.prototype.getDependency = function ( type, index ) {

		var cacheKey = type + ':' + index;
		var dependency = this.cache.get( cacheKey );

		if ( ! dependency ) {

			switch ( type ) {

				case 'scene':
					dependency = this.loadScene( index );
					break;

				case 'node':
					dependency = this.loadNode( index );
					break;

				case 'mesh':
					dependency = this.loadMesh( index );
					break;

				case 'accessor':
					dependency = this.loadAccessor( index );
					break;

				case 'bufferView':
					dependency = this.loadBufferView( index );
					break;

				case 'buffer':
					dependency = this.loadBuffer( index );
					break;

				case 'material':
					dependency = this.loadMaterial( index );
					break;

				case 'texture':
					dependency = this.loadTexture( index );
					break;

				case 'skin':
					dependency = this.loadSkin( index );
					break;

				case 'animation':
					dependency = this.loadAnimation( index );
					break;

				case 'camera':
					dependency = this.loadCamera( index );
					break;

				case 'light':
					dependency = this.extensions[ EXTENSIONS.KHR_LIGHTS_PUNCTUAL ].loadLight( index );
					break;

				default:
					throw new Error( 'Unknown type: ' + type );

			}

			this.cache.add( cacheKey, dependency );

		}

		return dependency;

	};

	/**
	 * Requests all dependencies of the specified type asynchronously, with caching.
	 * @param {string} type
	 * @return {Promise<Array<Object>>}
	 */
	GLTFParser.prototype.getDependencies = function ( type ) {

		var dependencies = this.cache.get( type );

		if ( ! dependencies ) {

			var parser = this;
			var defs = this.json[ type + ( type === 'mesh' ? 'es' : 's' ) ] || [];

			dependencies = Promise.all( defs.map( function ( def, index ) {

				return parser.getDependency( type, index );

			} ) );

			this.cache.add( type, dependencies );

		}

		return dependencies;

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#buffers-and-buffer-views
	 * @param {number} bufferIndex
	 * @return {Promise<ArrayBuffer>}
	 */
	GLTFParser.prototype.loadBuffer = function ( bufferIndex ) {

		var bufferDef = this.json.buffers[ bufferIndex ];
		var loader = this.fileLoader;

		if ( bufferDef.type && bufferDef.type !== 'arraybuffer' ) {

			throw new Error( 'THREE.GLTFLoader: ' + bufferDef.type + ' buffer type is not supported.' );

		}

		// If present, GLB container is required to be the first buffer.
		if ( bufferDef.uri === undefined && bufferIndex === 0 ) {

			return Promise.resolve( this.extensions[ EXTENSIONS.KHR_BINARY_GLTF ].body );

		}

		var options = this.options;

		return new Promise( function ( resolve, reject ) {

			loader.load( resolveURL( bufferDef.uri, options.path ), resolve, undefined, function () {

				reject( new Error( 'THREE.GLTFLoader: Failed to load buffer "' + bufferDef.uri + '".' ) );

			} );

		} );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#buffers-and-buffer-views
	 * @param {number} bufferViewIndex
	 * @return {Promise<ArrayBuffer>}
	 */
	GLTFParser.prototype.loadBufferView = function ( bufferViewIndex ) {

		var bufferViewDef = this.json.bufferViews[ bufferViewIndex ];

		return this.getDependency( 'buffer', bufferViewDef.buffer ).then( function ( buffer ) {

			var byteLength = bufferViewDef.byteLength || 0;
			var byteOffset = bufferViewDef.byteOffset || 0;
			return buffer.slice( byteOffset, byteOffset + byteLength );

		} );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#accessors
	 * @param {number} accessorIndex
	 * @return {Promise<BufferAttribute|InterleavedBufferAttribute>}
	 */
	GLTFParser.prototype.loadAccessor = function ( accessorIndex ) {

		var parser = this;
		var json = this.json;

		var accessorDef = this.json.accessors[ accessorIndex ];

		if ( accessorDef.bufferView === undefined && accessorDef.sparse === undefined ) {

			// Ignore empty accessors, which may be used to declare runtime
			// information about attributes coming from another source (e.g. Draco
			// compression extension).
			return Promise.resolve( null );

		}

		var pendingBufferViews = [];

		if ( accessorDef.bufferView !== undefined ) {

			pendingBufferViews.push( this.getDependency( 'bufferView', accessorDef.bufferView ) );

		} else {

			pendingBufferViews.push( null );

		}

		if ( accessorDef.sparse !== undefined ) {

			pendingBufferViews.push( this.getDependency( 'bufferView', accessorDef.sparse.indices.bufferView ) );
			pendingBufferViews.push( this.getDependency( 'bufferView', accessorDef.sparse.values.bufferView ) );

		}

		return Promise.all( pendingBufferViews ).then( function ( bufferViews ) {

			var bufferView = bufferViews[ 0 ];

			var itemSize = WEBGL_TYPE_SIZES[ accessorDef.type ];
			var TypedArray = WEBGL_COMPONENT_TYPES[ accessorDef.componentType ];

			// For VEC3: itemSize is 3, elementBytes is 4, itemBytes is 12.
			var elementBytes = TypedArray.BYTES_PER_ELEMENT;
			var itemBytes = elementBytes * itemSize;
			var byteOffset = accessorDef.byteOffset || 0;
			var byteStride = accessorDef.bufferView !== undefined ? json.bufferViews[ accessorDef.bufferView ].byteStride : undefined;
			var normalized = accessorDef.normalized === true;
			var array, bufferAttribute;

			// The buffer is not interleaved if the stride is the item size in bytes.
			if ( byteStride && byteStride !== itemBytes ) {

				// Each "slice" of the buffer, as defined by 'count' elements of 'byteStride' bytes, gets its own InterleavedBuffer
				// This makes sure that IBA.count reflects accessor.count properly
				var ibSlice = Math.floor( byteOffset / byteStride );
				var ibCacheKey = 'InterleavedBuffer:' + accessorDef.bufferView + ':' + accessorDef.componentType + ':' + ibSlice + ':' + accessorDef.count;
				var ib = parser.cache.get( ibCacheKey );

				if ( ! ib ) {

					array = new TypedArray( bufferView, ibSlice * byteStride, accessorDef.count * byteStride / elementBytes );

					// Integer parameters to IB/IBA are in array elements, not bytes.
					ib = new InterleavedBuffer( array, byteStride / elementBytes );

					parser.cache.add( ibCacheKey, ib );

				}

				bufferAttribute = new InterleavedBufferAttribute( ib, itemSize, ( byteOffset % byteStride ) / elementBytes, normalized );

			} else {

				if ( bufferView === null ) {

					array = new TypedArray( accessorDef.count * itemSize );

				} else {

					array = new TypedArray( bufferView, byteOffset, accessorDef.count * itemSize );

				}

				bufferAttribute = new BufferAttribute( array, itemSize, normalized );

			}

			// https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#sparse-accessors
			if ( accessorDef.sparse !== undefined ) {

				var itemSizeIndices = WEBGL_TYPE_SIZES.SCALAR;
				var TypedArrayIndices = WEBGL_COMPONENT_TYPES[ accessorDef.sparse.indices.componentType ];

				var byteOffsetIndices = accessorDef.sparse.indices.byteOffset || 0;
				var byteOffsetValues = accessorDef.sparse.values.byteOffset || 0;

				var sparseIndices = new TypedArrayIndices( bufferViews[ 1 ], byteOffsetIndices, accessorDef.sparse.count * itemSizeIndices );
				var sparseValues = new TypedArray( bufferViews[ 2 ], byteOffsetValues, accessorDef.sparse.count * itemSize );

				if ( bufferView !== null ) {

					// Avoid modifying the original ArrayBuffer, if the bufferView wasn't initialized with zeroes.
					bufferAttribute = new BufferAttribute( bufferAttribute.array.slice(), bufferAttribute.itemSize, bufferAttribute.normalized );

				}

				for ( var i = 0, il = sparseIndices.length; i < il; i ++ ) {

					var index = sparseIndices[ i ];

					bufferAttribute.setX( index, sparseValues[ i * itemSize ] );
					if ( itemSize >= 2 ) bufferAttribute.setY( index, sparseValues[ i * itemSize + 1 ] );
					if ( itemSize >= 3 ) bufferAttribute.setZ( index, sparseValues[ i * itemSize + 2 ] );
					if ( itemSize >= 4 ) bufferAttribute.setW( index, sparseValues[ i * itemSize + 3 ] );
					if ( itemSize >= 5 ) throw new Error( 'THREE.GLTFLoader: Unsupported itemSize in sparse BufferAttribute.' );

				}

			}

			return bufferAttribute;

		} );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#textures
	 * @param {number} textureIndex
	 * @return {Promise<THREE.Texture>}
	 */
	GLTFParser.prototype.loadTexture = function ( textureIndex ) {

		var parser = this;
		var json = this.json;
		var options = this.options;
		var textureLoader = this.textureLoader;

		var URL = self.URL || self.webkitURL;

		var textureDef = json.textures[ textureIndex ];

		var textureExtensions = textureDef.extensions || {};

		var source;

		if ( textureExtensions[ EXTENSIONS.MSFT_TEXTURE_DDS ] ) {

			source = json.images[ textureExtensions[ EXTENSIONS.MSFT_TEXTURE_DDS ].source ];

		} else {

			source = json.images[ textureDef.source ];

		}

		var sourceURI = source.uri;
		var isObjectURL = false;

		if ( source.bufferView !== undefined ) {

			// Load binary image data from bufferView, if provided.

			sourceURI = parser.getDependency( 'bufferView', source.bufferView ).then( function ( bufferView ) {

				isObjectURL = true;
				var blob = new Blob( [ bufferView ], { type: source.mimeType } );
				sourceURI = URL.createObjectURL( blob );
				return sourceURI;

			} );

		}

		return Promise.resolve( sourceURI ).then( function ( sourceURI ) {

			// Load Texture resource.

			var loader = options.manager.getHandler( sourceURI );

			if ( ! loader ) {

				loader = textureExtensions[ EXTENSIONS.MSFT_TEXTURE_DDS ]
					? parser.extensions[ EXTENSIONS.MSFT_TEXTURE_DDS ].ddsLoader
					: textureLoader;

			}

			return new Promise( function ( resolve, reject ) {

				loader.load( resolveURL( sourceURI, options.path ), resolve, undefined, reject );

			} );

		} ).then( function ( texture ) {

			// Clean up resources and configure Texture.

			if ( isObjectURL === true ) {

				URL.revokeObjectURL( sourceURI );

			}

			texture.flipY = false;

			if ( textureDef.name ) texture.name = textureDef.name;

			// Ignore unknown mime types, like DDS files.
			if ( source.mimeType in MIME_TYPE_FORMATS ) {

				texture.format = MIME_TYPE_FORMATS[ source.mimeType ];

			}

			var samplers = json.samplers || {};
			var sampler = samplers[ textureDef.sampler ] || {};

			texture.magFilter = WEBGL_FILTERS[ sampler.magFilter ] || LinearFilter;
			texture.minFilter = WEBGL_FILTERS[ sampler.minFilter ] || LinearMipmapLinearFilter;
			texture.wrapS = WEBGL_WRAPPINGS[ sampler.wrapS ] || RepeatWrapping;
			texture.wrapT = WEBGL_WRAPPINGS[ sampler.wrapT ] || RepeatWrapping;

			return texture;

		} );

	};

	/**
	 * Asynchronously assigns a texture to the given material parameters.
	 * @param {Object} materialParams
	 * @param {string} mapName
	 * @param {Object} mapDef
	 * @return {Promise}
	 */
	GLTFParser.prototype.assignTexture = function ( materialParams, mapName, mapDef ) {

		var parser = this;

		return this.getDependency( 'texture', mapDef.index ).then( function ( texture ) {

			if ( ! texture.isCompressedTexture ) {

				switch ( mapName ) {

					case 'aoMap':
					case 'emissiveMap':
					case 'metalnessMap':
					case 'normalMap':
					case 'roughnessMap':
						texture.format = RGBFormat;
						break;

				}

			}

			// Materials sample aoMap from UV set 1 and other maps from UV set 0 - this can't be configured
			// However, we will copy UV set 0 to UV set 1 on demand for aoMap
			if ( mapDef.texCoord !== undefined && mapDef.texCoord != 0 && ! ( mapName === 'aoMap' && mapDef.texCoord == 1 ) ) {

				console.warn( 'THREE.GLTFLoader: Custom UV set ' + mapDef.texCoord + ' for texture ' + mapName + ' not yet supported.' );

			}

			if ( parser.extensions[ EXTENSIONS.KHR_TEXTURE_TRANSFORM ] ) {

				var transform = mapDef.extensions !== undefined ? mapDef.extensions[ EXTENSIONS.KHR_TEXTURE_TRANSFORM ] : undefined;

				if ( transform ) {

					texture = parser.extensions[ EXTENSIONS.KHR_TEXTURE_TRANSFORM ].extendTexture( texture, transform );

				}

			}

			materialParams[ mapName ] = texture;

		} );

	};

	/**
	 * Assigns final material to a Mesh, Line, or Points instance. The instance
	 * already has a material (generated from the glTF material options alone)
	 * but reuse of the same glTF material may require multiple threejs materials
	 * to accomodate different primitive types, defines, etc. New materials will
	 * be created if necessary, and reused from a cache.
	 * @param  {Object3D} mesh Mesh, Line, or Points instance.
	 */
	GLTFParser.prototype.assignFinalMaterial = function ( mesh ) {

		var geometry = mesh.geometry;
		var material = mesh.material;

		var useVertexTangents = geometry.attributes.tangent !== undefined;
		var useVertexColors = geometry.attributes.color !== undefined;
		var useFlatShading = geometry.attributes.normal === undefined;
		var useSkinning = mesh.isSkinnedMesh === true;
		var useMorphTargets = Object.keys( geometry.morphAttributes ).length > 0;
		var useMorphNormals = useMorphTargets && geometry.morphAttributes.normal !== undefined;

		if ( mesh.isPoints ) {

			var cacheKey = 'PointsMaterial:' + material.uuid;

			var pointsMaterial = this.cache.get( cacheKey );

			if ( ! pointsMaterial ) {

				pointsMaterial = new PointsMaterial();
				Material.prototype.copy.call( pointsMaterial, material );
				pointsMaterial.color.copy( material.color );
				pointsMaterial.map = material.map;
				pointsMaterial.sizeAttenuation = false; // glTF spec says points should be 1px

				this.cache.add( cacheKey, pointsMaterial );

			}

			material = pointsMaterial;

		} else if ( mesh.isLine ) {

			var cacheKey = 'LineBasicMaterial:' + material.uuid;

			var lineMaterial = this.cache.get( cacheKey );

			if ( ! lineMaterial ) {

				lineMaterial = new LineBasicMaterial();
				Material.prototype.copy.call( lineMaterial, material );
				lineMaterial.color.copy( material.color );

				this.cache.add( cacheKey, lineMaterial );

			}

			material = lineMaterial;

		}

		// Clone the material if it will be modified
		if ( useVertexTangents || useVertexColors || useFlatShading || useSkinning || useMorphTargets ) {

			var cacheKey = 'ClonedMaterial:' + material.uuid + ':';

			if ( material.isGLTFSpecularGlossinessMaterial ) cacheKey += 'specular-glossiness:';
			if ( useSkinning ) cacheKey += 'skinning:';
			if ( useVertexTangents ) cacheKey += 'vertex-tangents:';
			if ( useVertexColors ) cacheKey += 'vertex-colors:';
			if ( useFlatShading ) cacheKey += 'flat-shading:';
			if ( useMorphTargets ) cacheKey += 'morph-targets:';
			if ( useMorphNormals ) cacheKey += 'morph-normals:';

			var cachedMaterial = this.cache.get( cacheKey );

			if ( ! cachedMaterial ) {

				cachedMaterial = material.clone();

				if ( useSkinning ) cachedMaterial.skinning = true;
				if ( useVertexTangents ) cachedMaterial.vertexTangents = true;
				if ( useVertexColors ) cachedMaterial.vertexColors = true;
				if ( useFlatShading ) cachedMaterial.flatShading = true;
				if ( useMorphTargets ) cachedMaterial.morphTargets = true;
				if ( useMorphNormals ) cachedMaterial.morphNormals = true;

				this.cache.add( cacheKey, cachedMaterial );

			}

			material = cachedMaterial;

		}

		// workarounds for mesh and geometry

		if ( material.aoMap && geometry.attributes.uv2 === undefined && geometry.attributes.uv !== undefined ) {

			geometry.setAttribute( 'uv2', geometry.attributes.uv );

		}

		// https://github.com/mrdoob/three.js/issues/11438#issuecomment-507003995
		if ( material.normalScale && ! useVertexTangents ) {

			material.normalScale.y = - material.normalScale.y;

		}

		if ( material.clearcoatNormalScale && ! useVertexTangents ) {

			material.clearcoatNormalScale.y = - material.clearcoatNormalScale.y;

		}

		mesh.material = material;

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#materials
	 * @param {number} materialIndex
	 * @return {Promise<Material>}
	 */
	GLTFParser.prototype.loadMaterial = function ( materialIndex ) {

		var parser = this;
		var json = this.json;
		var extensions = this.extensions;
		var materialDef = json.materials[ materialIndex ];

		var materialType;
		var materialParams = {};
		var materialExtensions = materialDef.extensions || {};

		var pending = [];

		if ( materialExtensions[ EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS ] ) {

			var sgExtension = extensions[ EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS ];
			materialType = sgExtension.getMaterialType();
			pending.push( sgExtension.extendParams( materialParams, materialDef, parser ) );

		} else if ( materialExtensions[ EXTENSIONS.KHR_MATERIALS_UNLIT ] ) {

			var kmuExtension = extensions[ EXTENSIONS.KHR_MATERIALS_UNLIT ];
			materialType = kmuExtension.getMaterialType();
			pending.push( kmuExtension.extendParams( materialParams, materialDef, parser ) );

		} else {

			// Specification:
			// https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#metallic-roughness-material

			materialType = MeshStandardMaterial;

			var metallicRoughness = materialDef.pbrMetallicRoughness || {};

			materialParams.color = new Color( 1.0, 1.0, 1.0 );
			materialParams.opacity = 1.0;

			if ( Array.isArray( metallicRoughness.baseColorFactor ) ) {

				var array = metallicRoughness.baseColorFactor;

				materialParams.color.fromArray( array );
				materialParams.opacity = array[ 3 ];

			}

			if ( metallicRoughness.baseColorTexture !== undefined ) {

				pending.push( parser.assignTexture( materialParams, 'map', metallicRoughness.baseColorTexture ) );

			}

			materialParams.metalness = metallicRoughness.metallicFactor !== undefined ? metallicRoughness.metallicFactor : 1.0;
			materialParams.roughness = metallicRoughness.roughnessFactor !== undefined ? metallicRoughness.roughnessFactor : 1.0;

			if ( metallicRoughness.metallicRoughnessTexture !== undefined ) {

				pending.push( parser.assignTexture( materialParams, 'metalnessMap', metallicRoughness.metallicRoughnessTexture ) );
				pending.push( parser.assignTexture( materialParams, 'roughnessMap', metallicRoughness.metallicRoughnessTexture ) );

			}

		}

		if ( materialDef.doubleSided === true ) {

			materialParams.side = DoubleSide;

		}

		var alphaMode = materialDef.alphaMode || ALPHA_MODES.OPAQUE;

		if ( alphaMode === ALPHA_MODES.BLEND ) {

			materialParams.transparent = true;

			// See: https://github.com/mrdoob/three.js/issues/17706
			materialParams.depthWrite = false;

		} else {

			materialParams.transparent = false;

			if ( alphaMode === ALPHA_MODES.MASK ) {

				materialParams.alphaTest = materialDef.alphaCutoff !== undefined ? materialDef.alphaCutoff : 0.5;

			}

		}

		if ( materialDef.normalTexture !== undefined && materialType !== MeshBasicMaterial ) {

			pending.push( parser.assignTexture( materialParams, 'normalMap', materialDef.normalTexture ) );

			materialParams.normalScale = new Vector2( 1, 1 );

			if ( materialDef.normalTexture.scale !== undefined ) {

				materialParams.normalScale.set( materialDef.normalTexture.scale, materialDef.normalTexture.scale );

			}

		}

		if ( materialDef.occlusionTexture !== undefined && materialType !== MeshBasicMaterial ) {

			pending.push( parser.assignTexture( materialParams, 'aoMap', materialDef.occlusionTexture ) );

			if ( materialDef.occlusionTexture.strength !== undefined ) {

				materialParams.aoMapIntensity = materialDef.occlusionTexture.strength;

			}

		}

		if ( materialDef.emissiveFactor !== undefined && materialType !== MeshBasicMaterial ) {

			materialParams.emissive = new Color().fromArray( materialDef.emissiveFactor );

		}

		if ( materialDef.emissiveTexture !== undefined && materialType !== MeshBasicMaterial ) {

			pending.push( parser.assignTexture( materialParams, 'emissiveMap', materialDef.emissiveTexture ) );

		}

		if ( materialExtensions[ EXTENSIONS.KHR_MATERIALS_CLEARCOAT ] ) {

			var clearcoatExtension = extensions[ EXTENSIONS.KHR_MATERIALS_CLEARCOAT ];
			materialType = clearcoatExtension.getMaterialType();
			pending.push( clearcoatExtension.extendParams( materialParams, { extensions: materialExtensions }, parser ) );

		}

		return Promise.all( pending ).then( function () {

			var material;

			if ( materialType === GLTFMeshStandardSGMaterial ) {

				material = extensions[ EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS ].createMaterial( materialParams );

			} else {

				material = new materialType( materialParams );

			}

			if ( materialDef.name ) material.name = materialDef.name;

			// baseColorTexture, emissiveTexture, and specularGlossinessTexture use sRGB encoding.
			if ( material.map ) material.map.encoding = sRGBEncoding;
			if ( material.emissiveMap ) material.emissiveMap.encoding = sRGBEncoding;

			assignExtrasToUserData( material, materialDef );

			if ( materialDef.extensions ) addUnknownExtensionsToUserData( extensions, material, materialDef );

			return material;

		} );

	};

	/**
	 * @param {BufferGeometry} geometry
	 * @param {GLTF.Primitive} primitiveDef
	 * @param {GLTFParser} parser
	 */
	function computeBounds( geometry, primitiveDef, parser ) {

		var attributes = primitiveDef.attributes;

		var box = new Box3();

		if ( attributes.POSITION !== undefined ) {

			var accessor = parser.json.accessors[ attributes.POSITION ];

			var min = accessor.min;
			var max = accessor.max;

			// glTF requires 'min' and 'max', but VRM (which extends glTF) currently ignores that requirement.

			if ( min !== undefined && max !== undefined ) {

				box.set(
					new Vector3( min[ 0 ], min[ 1 ], min[ 2 ] ),
					new Vector3( max[ 0 ], max[ 1 ], max[ 2 ] ) );

			} else {

				console.warn( 'THREE.GLTFLoader: Missing min/max properties for accessor POSITION.' );

				return;

			}

		} else {

			return;

		}

		var targets = primitiveDef.targets;

		if ( targets !== undefined ) {

			var maxDisplacement = new Vector3();
			var vector = new Vector3();

			for ( var i = 0, il = targets.length; i < il; i ++ ) {

				var target = targets[ i ];

				if ( target.POSITION !== undefined ) {

					var accessor = parser.json.accessors[ target.POSITION ];
					var min = accessor.min;
					var max = accessor.max;

					// glTF requires 'min' and 'max', but VRM (which extends glTF) currently ignores that requirement.

					if ( min !== undefined && max !== undefined ) {

						// we need to get max of absolute components because target weight is [-1,1]
						vector.setX( Math.max( Math.abs( min[ 0 ] ), Math.abs( max[ 0 ] ) ) );
						vector.setY( Math.max( Math.abs( min[ 1 ] ), Math.abs( max[ 1 ] ) ) );
						vector.setZ( Math.max( Math.abs( min[ 2 ] ), Math.abs( max[ 2 ] ) ) );

						// Note: this assumes that the sum of all weights is at most 1. This isn't quite correct - it's more conservative
						// to assume that each target can have a max weight of 1. However, for some use cases - notably, when morph targets
						// are used to implement key-frame animations and as such only two are active at a time - this results in very large
						// boxes. So for now we make a box that's sometimes a touch too small but is hopefully mostly of reasonable size.
						maxDisplacement.max( vector );

					} else {

						console.warn( 'THREE.GLTFLoader: Missing min/max properties for accessor POSITION.' );

					}

				}

			}

			// As per comment above this box isn't conservative, but has a reasonable size for a very large number of morph targets.
			box.expandByVector( maxDisplacement );

		}

		geometry.boundingBox = box;

		var sphere = new Sphere();

		box.getCenter( sphere.center );
		sphere.radius = box.min.distanceTo( box.max ) / 2;

		geometry.boundingSphere = sphere;

	}

	/**
	 * @param {BufferGeometry} geometry
	 * @param {GLTF.Primitive} primitiveDef
	 * @param {GLTFParser} parser
	 * @return {Promise<BufferGeometry>}
	 */
	function addPrimitiveAttributes( geometry, primitiveDef, parser ) {

		var attributes = primitiveDef.attributes;

		var pending = [];

		function assignAttributeAccessor( accessorIndex, attributeName ) {

			return parser.getDependency( 'accessor', accessorIndex )
				.then( function ( accessor ) {

					geometry.setAttribute( attributeName, accessor );

				} );

		}

		for ( var gltfAttributeName in attributes ) {

			var threeAttributeName = ATTRIBUTES[ gltfAttributeName ] || gltfAttributeName.toLowerCase();

			// Skip attributes already provided by e.g. Draco extension.
			if ( threeAttributeName in geometry.attributes ) continue;

			pending.push( assignAttributeAccessor( attributes[ gltfAttributeName ], threeAttributeName ) );

		}

		if ( primitiveDef.indices !== undefined && ! geometry.index ) {

			var accessor = parser.getDependency( 'accessor', primitiveDef.indices ).then( function ( accessor ) {

				geometry.setIndex( accessor );

			} );

			pending.push( accessor );

		}

		assignExtrasToUserData( geometry, primitiveDef );

		computeBounds( geometry, primitiveDef, parser );

		return Promise.all( pending ).then( function () {

			return primitiveDef.targets !== undefined
				? addMorphTargets( geometry, primitiveDef.targets, parser )
				: geometry;

		} );

	}

	/**
	 * @param {BufferGeometry} geometry
	 * @param {Number} drawMode
	 * @return {BufferGeometry}
	 */
	function toTrianglesDrawMode( geometry, drawMode ) {

		var index = geometry.getIndex();

		// generate index if not present

		if ( index === null ) {

			var indices = [];

			var position = geometry.getAttribute( 'position' );

			if ( position !== undefined ) {

				for ( var i = 0; i < position.count; i ++ ) {

					indices.push( i );

				}

				geometry.setIndex( indices );
				index = geometry.getIndex();

			} else {

				console.error( 'THREE.GLTFLoader.toTrianglesDrawMode(): Undefined position attribute. Processing not possible.' );
				return geometry;

			}

		}

		//

		var numberOfTriangles = index.count - 2;
		var newIndices = [];

		if ( drawMode === TriangleFanDrawMode ) {

			// gl.TRIANGLE_FAN

			for ( var i = 1; i <= numberOfTriangles; i ++ ) {

				newIndices.push( index.getX( 0 ) );
				newIndices.push( index.getX( i ) );
				newIndices.push( index.getX( i + 1 ) );

			}

		} else {

			// gl.TRIANGLE_STRIP

			for ( var i = 0; i < numberOfTriangles; i ++ ) {

				if ( i % 2 === 0 ) {

					newIndices.push( index.getX( i ) );
					newIndices.push( index.getX( i + 1 ) );
					newIndices.push( index.getX( i + 2 ) );


				} else {

					newIndices.push( index.getX( i + 2 ) );
					newIndices.push( index.getX( i + 1 ) );
					newIndices.push( index.getX( i ) );

				}

			}

		}

		if ( ( newIndices.length / 3 ) !== numberOfTriangles ) {

			console.error( 'THREE.GLTFLoader.toTrianglesDrawMode(): Unable to generate correct amount of triangles.' );

		}

		// build final geometry

		var newGeometry = geometry.clone();
		newGeometry.setIndex( newIndices );

		return newGeometry;

	}

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#geometry
	 *
	 * Creates BufferGeometries from primitives.
	 *
	 * @param {Array<GLTF.Primitive>} primitives
	 * @return {Promise<Array<BufferGeometry>>}
	 */
	GLTFParser.prototype.loadGeometries = function ( primitives ) {

		var parser = this;
		var extensions = this.extensions;
		var cache = this.primitiveCache;

		function createDracoPrimitive( primitive ) {

			return extensions[ EXTENSIONS.KHR_DRACO_MESH_COMPRESSION ]
				.decodePrimitive( primitive, parser )
				.then( function ( geometry ) {

					return addPrimitiveAttributes( geometry, primitive, parser );

				} );

		}

		var pending = [];

		for ( var i = 0, il = primitives.length; i < il; i ++ ) {

			var primitive = primitives[ i ];
			var cacheKey = createPrimitiveKey( primitive );

			// See if we've already created this geometry
			var cached = cache[ cacheKey ];

			if ( cached ) {

				// Use the cached geometry if it exists
				pending.push( cached.promise );

			} else {

				var geometryPromise;

				if ( primitive.extensions && primitive.extensions[ EXTENSIONS.KHR_DRACO_MESH_COMPRESSION ] ) {

					// Use DRACO geometry if available
					geometryPromise = createDracoPrimitive( primitive );

				} else {

					// Otherwise create a new geometry
					geometryPromise = addPrimitiveAttributes( new BufferGeometry(), primitive, parser );

				}

				// Cache this geometry
				cache[ cacheKey ] = { primitive: primitive, promise: geometryPromise };

				pending.push( geometryPromise );

			}

		}

		return Promise.all( pending );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#meshes
	 * @param {number} meshIndex
	 * @return {Promise<Group|Mesh|SkinnedMesh>}
	 */
	GLTFParser.prototype.loadMesh = function ( meshIndex ) {

		var parser = this;
		var json = this.json;

		var meshDef = json.meshes[ meshIndex ];
		var primitives = meshDef.primitives;

		var pending = [];

		for ( var i = 0, il = primitives.length; i < il; i ++ ) {

			var material = primitives[ i ].material === undefined
				? createDefaultMaterial( this.cache )
				: this.getDependency( 'material', primitives[ i ].material );

			pending.push( material );

		}

		pending.push( parser.loadGeometries( primitives ) );

		return Promise.all( pending ).then( function ( results ) {

			var materials = results.slice( 0, results.length - 1 );
			var geometries = results[ results.length - 1 ];

			var meshes = [];

			for ( var i = 0, il = geometries.length; i < il; i ++ ) {

				var geometry = geometries[ i ];
				var primitive = primitives[ i ];

				// 1. create Mesh

				var mesh;

				var material = materials[ i ];

				if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLES ||
					primitive.mode === WEBGL_CONSTANTS.TRIANGLE_STRIP ||
					primitive.mode === WEBGL_CONSTANTS.TRIANGLE_FAN ||
					primitive.mode === undefined ) {

					// .isSkinnedMesh isn't in glTF spec. See .markDefs()
					mesh = meshDef.isSkinnedMesh === true
						? new SkinnedMesh( geometry, material )
						: new Mesh( geometry, material );

					if ( mesh.isSkinnedMesh === true && ! mesh.geometry.attributes.skinWeight.normalized ) {

						// we normalize floating point skin weight array to fix malformed assets (see #15319)
						// it's important to skip this for non-float32 data since normalizeSkinWeights assumes non-normalized inputs
						mesh.normalizeSkinWeights();

					}

					if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLE_STRIP ) {

						mesh.geometry = toTrianglesDrawMode( mesh.geometry, TriangleStripDrawMode );

					} else if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLE_FAN ) {

						mesh.geometry = toTrianglesDrawMode( mesh.geometry, TriangleFanDrawMode );

					}

				} else if ( primitive.mode === WEBGL_CONSTANTS.LINES ) {

					mesh = new LineSegments( geometry, material );

				} else if ( primitive.mode === WEBGL_CONSTANTS.LINE_STRIP ) {

					mesh = new Line( geometry, material );

				} else if ( primitive.mode === WEBGL_CONSTANTS.LINE_LOOP ) {

					mesh = new LineLoop( geometry, material );

				} else if ( primitive.mode === WEBGL_CONSTANTS.POINTS ) {

					mesh = new Points( geometry, material );

				} else {

					throw new Error( 'THREE.GLTFLoader: Primitive mode unsupported: ' + primitive.mode );

				}

				if ( Object.keys( mesh.geometry.morphAttributes ).length > 0 ) {

					updateMorphTargets( mesh, meshDef );

				}

				mesh.name = meshDef.name || ( 'mesh_' + meshIndex );

				if ( geometries.length > 1 ) mesh.name += '_' + i;

				assignExtrasToUserData( mesh, meshDef );

				parser.assignFinalMaterial( mesh );

				meshes.push( mesh );

			}

			if ( meshes.length === 1 ) {

				return meshes[ 0 ];

			}

			var group = new Group();

			for ( var i = 0, il = meshes.length; i < il; i ++ ) {

				group.add( meshes[ i ] );

			}

			return group;

		} );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#cameras
	 * @param {number} cameraIndex
	 * @return {Promise<THREE.Camera>}
	 */
	GLTFParser.prototype.loadCamera = function ( cameraIndex ) {

		var camera;
		var cameraDef = this.json.cameras[ cameraIndex ];
		var params = cameraDef[ cameraDef.type ];

		if ( ! params ) {

			console.warn( 'THREE.GLTFLoader: Missing camera parameters.' );
			return;

		}

		if ( cameraDef.type === 'perspective' ) {

			camera = new PerspectiveCamera( MathUtils.radToDeg( params.yfov ), params.aspectRatio || 1, params.znear || 1, params.zfar || 2e6 );

		} else if ( cameraDef.type === 'orthographic' ) {

			camera = new OrthographicCamera( - params.xmag, params.xmag, params.ymag, - params.ymag, params.znear, params.zfar );

		}

		if ( cameraDef.name ) camera.name = cameraDef.name;

		assignExtrasToUserData( camera, cameraDef );

		return Promise.resolve( camera );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#skins
	 * @param {number} skinIndex
	 * @return {Promise<Object>}
	 */
	GLTFParser.prototype.loadSkin = function ( skinIndex ) {

		var skinDef = this.json.skins[ skinIndex ];

		var skinEntry = { joints: skinDef.joints };

		if ( skinDef.inverseBindMatrices === undefined ) {

			return Promise.resolve( skinEntry );

		}

		return this.getDependency( 'accessor', skinDef.inverseBindMatrices ).then( function ( accessor ) {

			skinEntry.inverseBindMatrices = accessor;

			return skinEntry;

		} );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#animations
	 * @param {number} animationIndex
	 * @return {Promise<AnimationClip>}
	 */
	GLTFParser.prototype.loadAnimation = function ( animationIndex ) {

		var json = this.json;

		var animationDef = json.animations[ animationIndex ];

		var pendingNodes = [];
		var pendingInputAccessors = [];
		var pendingOutputAccessors = [];
		var pendingSamplers = [];
		var pendingTargets = [];

		for ( var i = 0, il = animationDef.channels.length; i < il; i ++ ) {

			var channel = animationDef.channels[ i ];
			var sampler = animationDef.samplers[ channel.sampler ];
			var target = channel.target;
			var name = target.node !== undefined ? target.node : target.id; // NOTE: target.id is deprecated.
			var input = animationDef.parameters !== undefined ? animationDef.parameters[ sampler.input ] : sampler.input;
			var output = animationDef.parameters !== undefined ? animationDef.parameters[ sampler.output ] : sampler.output;

			pendingNodes.push( this.getDependency( 'node', name ) );
			pendingInputAccessors.push( this.getDependency( 'accessor', input ) );
			pendingOutputAccessors.push( this.getDependency( 'accessor', output ) );
			pendingSamplers.push( sampler );
			pendingTargets.push( target );

		}

		return Promise.all( [

			Promise.all( pendingNodes ),
			Promise.all( pendingInputAccessors ),
			Promise.all( pendingOutputAccessors ),
			Promise.all( pendingSamplers ),
			Promise.all( pendingTargets )

		] ).then( function ( dependencies ) {

			var nodes = dependencies[ 0 ];
			var inputAccessors = dependencies[ 1 ];
			var outputAccessors = dependencies[ 2 ];
			var samplers = dependencies[ 3 ];
			var targets = dependencies[ 4 ];

			var tracks = [];

			for ( var i = 0, il = nodes.length; i < il; i ++ ) {

				var node = nodes[ i ];
				var inputAccessor = inputAccessors[ i ];
				var outputAccessor = outputAccessors[ i ];
				var sampler = samplers[ i ];
				var target = targets[ i ];

				if ( node === undefined ) continue;

				node.updateMatrix();
				node.matrixAutoUpdate = true;

				var TypedKeyframeTrack;

				switch ( PATH_PROPERTIES[ target.path ] ) {

					case PATH_PROPERTIES.weights:

						TypedKeyframeTrack = NumberKeyframeTrack;
						break;

					case PATH_PROPERTIES.rotation:

						TypedKeyframeTrack = QuaternionKeyframeTrack;
						break;

					case PATH_PROPERTIES.position:
					case PATH_PROPERTIES.scale:
					default:

						TypedKeyframeTrack = VectorKeyframeTrack;
						break;

				}

				var targetName = node.name ? node.name : node.uuid;

				var interpolation = sampler.interpolation !== undefined ? INTERPOLATION[ sampler.interpolation ] : InterpolateLinear;

				var targetNames = [];

				if ( PATH_PROPERTIES[ target.path ] === PATH_PROPERTIES.weights ) {

					// Node may be a Group (glTF mesh with several primitives) or a Mesh.
					node.traverse( function ( object ) {

						if ( object.isMesh === true && object.morphTargetInfluences ) {

							targetNames.push( object.name ? object.name : object.uuid );

						}

					} );

				} else {

					targetNames.push( targetName );

				}

				var outputArray = outputAccessor.array;

				if ( outputAccessor.normalized ) {

					var scale;

					if ( outputArray.constructor === Int8Array ) {

						scale = 1 / 127;

					} else if ( outputArray.constructor === Uint8Array ) {

						scale = 1 / 255;

					} else if ( outputArray.constructor == Int16Array ) {

						scale = 1 / 32767;

					} else if ( outputArray.constructor === Uint16Array ) {

						scale = 1 / 65535;

					} else {

						throw new Error( 'THREE.GLTFLoader: Unsupported output accessor component type.' );

					}

					var scaled = new Float32Array( outputArray.length );

					for ( var j = 0, jl = outputArray.length; j < jl; j ++ ) {

						scaled[ j ] = outputArray[ j ] * scale;

					}

					outputArray = scaled;

				}

				for ( var j = 0, jl = targetNames.length; j < jl; j ++ ) {

					var track = new TypedKeyframeTrack(
						targetNames[ j ] + '.' + PATH_PROPERTIES[ target.path ],
						inputAccessor.array,
						outputArray,
						interpolation
					);

					// Override interpolation with custom factory method.
					if ( sampler.interpolation === 'CUBICSPLINE' ) {

						track.createInterpolant = function InterpolantFactoryMethodGLTFCubicSpline( result ) {

							// A CUBICSPLINE keyframe in glTF has three output values for each input value,
							// representing inTangent, splineVertex, and outTangent. As a result, track.getValueSize()
							// must be divided by three to get the interpolant's sampleSize argument.

							return new GLTFCubicSplineInterpolant( this.times, this.values, this.getValueSize() / 3, result );

						};

						// Mark as CUBICSPLINE. `track.getInterpolation()` doesn't support custom interpolants.
						track.createInterpolant.isInterpolantFactoryMethodGLTFCubicSpline = true;

					}

					tracks.push( track );

				}

			}

			var name = animationDef.name ? animationDef.name : 'animation_' + animationIndex;

			return new AnimationClip( name, undefined, tracks );

		} );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#nodes-and-hierarchy
	 * @param {number} nodeIndex
	 * @return {Promise<Object3D>}
	 */
	GLTFParser.prototype.loadNode = function ( nodeIndex ) {

		var json = this.json;
		var extensions = this.extensions;
		var parser = this;

		var meshReferences = json.meshReferences;
		var meshUses = json.meshUses;

		var nodeDef = json.nodes[ nodeIndex ];

		return ( function () {

			var pending = [];

			if ( nodeDef.mesh !== undefined ) {

				pending.push( parser.getDependency( 'mesh', nodeDef.mesh ).then( function ( mesh ) {

					var node;

					if ( meshReferences[ nodeDef.mesh ] > 1 ) {

						var instanceNum = meshUses[ nodeDef.mesh ] ++;

						node = mesh.clone();
						node.name += '_instance_' + instanceNum;

					} else {

						node = mesh;

					}

					// if weights are provided on the node, override weights on the mesh.
					if ( nodeDef.weights !== undefined ) {

						node.traverse( function ( o ) {

							if ( ! o.isMesh ) return;

							for ( var i = 0, il = nodeDef.weights.length; i < il; i ++ ) {

								o.morphTargetInfluences[ i ] = nodeDef.weights[ i ];

							}

						} );

					}

					return node;

				} ) );

			}

			if ( nodeDef.camera !== undefined ) {

				pending.push( parser.getDependency( 'camera', nodeDef.camera ) );

			}

			if ( nodeDef.extensions
				&& nodeDef.extensions[ EXTENSIONS.KHR_LIGHTS_PUNCTUAL ]
				&& nodeDef.extensions[ EXTENSIONS.KHR_LIGHTS_PUNCTUAL ].light !== undefined ) {

				pending.push( parser.getDependency( 'light', nodeDef.extensions[ EXTENSIONS.KHR_LIGHTS_PUNCTUAL ].light ) );

			}

			return Promise.all( pending );

		}() ).then( function ( objects ) {

			var node;

			// .isBone isn't in glTF spec. See .markDefs
			if ( nodeDef.isBone === true ) {

				node = new Bone();

			} else if ( objects.length > 1 ) {

				node = new Group();

			} else if ( objects.length === 1 ) {

				node = objects[ 0 ];

			} else {

				node = new Object3D();

			}

			if ( node !== objects[ 0 ] ) {

				for ( var i = 0, il = objects.length; i < il; i ++ ) {

					node.add( objects[ i ] );

				}

			}

			if ( nodeDef.name ) {

				node.userData.name = nodeDef.name;
				node.name = PropertyBinding.sanitizeNodeName( nodeDef.name );

			}

			assignExtrasToUserData( node, nodeDef );

			if ( nodeDef.extensions ) addUnknownExtensionsToUserData( extensions, node, nodeDef );

			if ( nodeDef.matrix !== undefined ) {

				var matrix = new Matrix4();
				matrix.fromArray( nodeDef.matrix );
				node.applyMatrix4( matrix );

			} else {

				if ( nodeDef.translation !== undefined ) {

					node.position.fromArray( nodeDef.translation );

				}

				if ( nodeDef.rotation !== undefined ) {

					node.quaternion.fromArray( nodeDef.rotation );

				}

				if ( nodeDef.scale !== undefined ) {

					node.scale.fromArray( nodeDef.scale );

				}

			}

			return node;

		} );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#scenes
	 * @param {number} sceneIndex
	 * @return {Promise<Group>}
	 */
	GLTFParser.prototype.loadScene = function () {

		// scene node hierachy builder

		function buildNodeHierachy( nodeId, parentObject, json, parser ) {

			var nodeDef = json.nodes[ nodeId ];

			return parser.getDependency( 'node', nodeId ).then( function ( node ) {

				if ( nodeDef.skin === undefined ) return node;

				// build skeleton here as well

				var skinEntry;

				return parser.getDependency( 'skin', nodeDef.skin ).then( function ( skin ) {

					skinEntry = skin;

					var pendingJoints = [];

					for ( var i = 0, il = skinEntry.joints.length; i < il; i ++ ) {

						pendingJoints.push( parser.getDependency( 'node', skinEntry.joints[ i ] ) );

					}

					return Promise.all( pendingJoints );

				} ).then( function ( jointNodes ) {

					node.traverse( function ( mesh ) {

						if ( ! mesh.isMesh ) return;

						var bones = [];
						var boneInverses = [];

						for ( var j = 0, jl = jointNodes.length; j < jl; j ++ ) {

							var jointNode = jointNodes[ j ];

							if ( jointNode ) {

								bones.push( jointNode );

								var mat = new Matrix4();

								if ( skinEntry.inverseBindMatrices !== undefined ) {

									mat.fromArray( skinEntry.inverseBindMatrices.array, j * 16 );

								}

								boneInverses.push( mat );

							} else {

								console.warn( 'THREE.GLTFLoader: Joint "%s" could not be found.', skinEntry.joints[ j ] );

							}

						}

						mesh.bind( new Skeleton( bones, boneInverses ), mesh.matrixWorld );

					} );

					return node;

				} );

			} ).then( function ( node ) {

				// build node hierachy

				parentObject.add( node );

				var pending = [];

				if ( nodeDef.children ) {

					var children = nodeDef.children;

					for ( var i = 0, il = children.length; i < il; i ++ ) {

						var child = children[ i ];
						pending.push( buildNodeHierachy( child, node, json, parser ) );

					}

				}

				return Promise.all( pending );

			} );

		}

		return function loadScene( sceneIndex ) {

			var json = this.json;
			var extensions = this.extensions;
			var sceneDef = this.json.scenes[ sceneIndex ];
			var parser = this;

			// Loader returns Group, not Scene.
			// See: https://github.com/mrdoob/three.js/issues/18342#issuecomment-578981172
			var scene = new Group();
			if ( sceneDef.name ) scene.name = sceneDef.name;

			assignExtrasToUserData( scene, sceneDef );

			if ( sceneDef.extensions ) addUnknownExtensionsToUserData( extensions, scene, sceneDef );

			var nodeIds = sceneDef.nodes || [];

			var pending = [];

			for ( var i = 0, il = nodeIds.length; i < il; i ++ ) {

				pending.push( buildNodeHierachy( nodeIds[ i ], scene, json, parser ) );

			}

			return Promise.all( pending ).then( function () {

				return scene;

			} );

		};

	}();

	return GLTFLoader;

} )()

BufferGeometryUtils = {

	computeTangents: function ( geometry ) {

		var index = geometry.index;
		var attributes = geometry.attributes;

		// based on http://www.terathon.com/code/tangent.html
		// (per vertex tangents)

		if ( index === null ||
			 attributes.position === undefined ||
			 attributes.normal === undefined ||
			 attributes.uv === undefined ) {

			console.error( 'THREE.BufferGeometryUtils: .computeTangents() failed. Missing required attributes (index, position, normal or uv)' );
			return;

		}

		var indices = index.array;
		var positions = attributes.position.array;
		var normals = attributes.normal.array;
		var uvs = attributes.uv.array;

		var nVertices = positions.length / 3;

		if ( attributes.tangent === undefined ) {

			geometry.setAttribute( 'tangent', new BufferAttribute( new Float32Array( 4 * nVertices ), 4 ) );

		}

		var tangents = attributes.tangent.array;

		var tan1 = [], tan2 = [];

		for ( var i = 0; i < nVertices; i ++ ) {

			tan1[ i ] = new Vector3();
			tan2[ i ] = new Vector3();

		}

		var vA = new Vector3(),
			vB = new Vector3(),
			vC = new Vector3(),

			uvA = new Vector2(),
			uvB = new Vector2(),
			uvC = new Vector2(),

			sdir = new Vector3(),
			tdir = new Vector3();

		function handleTriangle( a, b, c ) {

			vA.fromArray( positions, a * 3 );
			vB.fromArray( positions, b * 3 );
			vC.fromArray( positions, c * 3 );

			uvA.fromArray( uvs, a * 2 );
			uvB.fromArray( uvs, b * 2 );
			uvC.fromArray( uvs, c * 2 );

			vB.sub( vA );
			vC.sub( vA );

			uvB.sub( uvA );
			uvC.sub( uvA );

			var r = 1.0 / ( uvB.x * uvC.y - uvC.x * uvB.y );

			// silently ignore degenerate uv triangles having coincident or colinear vertices

			if ( ! isFinite( r ) ) return;

			sdir.copy( vB ).multiplyScalar( uvC.y ).addScaledVector( vC, - uvB.y ).multiplyScalar( r );
			tdir.copy( vC ).multiplyScalar( uvB.x ).addScaledVector( vB, - uvC.x ).multiplyScalar( r );

			tan1[ a ].add( sdir );
			tan1[ b ].add( sdir );
			tan1[ c ].add( sdir );

			tan2[ a ].add( tdir );
			tan2[ b ].add( tdir );
			tan2[ c ].add( tdir );

		}

		var groups = geometry.groups;

		if ( groups.length === 0 ) {

			groups = [ {
				start: 0,
				count: indices.length
			} ];

		}

		for ( var i = 0, il = groups.length; i < il; ++ i ) {

			var group = groups[ i ];

			var start = group.start;
			var count = group.count;

			for ( var j = start, jl = start + count; j < jl; j += 3 ) {

				handleTriangle(
					indices[ j + 0 ],
					indices[ j + 1 ],
					indices[ j + 2 ]
				);

			}

		}

		var tmp = new Vector3(), tmp2 = new Vector3();
		var n = new Vector3(), n2 = new Vector3();
		var w, t, test;

		function handleVertex( v ) {

			n.fromArray( normals, v * 3 );
			n2.copy( n );

			t = tan1[ v ];

			// Gram-Schmidt orthogonalize

			tmp.copy( t );
			tmp.sub( n.multiplyScalar( n.dot( t ) ) ).normalize();

			// Calculate handedness

			tmp2.crossVectors( n2, t );
			test = tmp2.dot( tan2[ v ] );
			w = ( test < 0.0 ) ? - 1.0 : 1.0;

			tangents[ v * 4 ] = tmp.x;
			tangents[ v * 4 + 1 ] = tmp.y;
			tangents[ v * 4 + 2 ] = tmp.z;
			tangents[ v * 4 + 3 ] = w;

		}

		for ( var i = 0, il = groups.length; i < il; ++ i ) {

			var group = groups[ i ];

			var start = group.start;
			var count = group.count;

			for ( var j = start, jl = start + count; j < jl; j += 3 ) {

				handleVertex( indices[ j + 0 ] );
				handleVertex( indices[ j + 1 ] );
				handleVertex( indices[ j + 2 ] );

			}

		}

	},

	/**
	 * @param  {Array<BufferGeometry>} geometries
	 * @param  {Boolean} useGroups
	 * @return {BufferGeometry}
	 */
	mergeBufferGeometries: function ( geometries, useGroups ) {

		var isIndexed = geometries[ 0 ].index !== null;

		var attributesUsed = new Set( Object.keys( geometries[ 0 ].attributes ) );
		var morphAttributesUsed = new Set( Object.keys( geometries[ 0 ].morphAttributes ) );

		var attributes = {};
		var morphAttributes = {};

		var morphTargetsRelative = geometries[ 0 ].morphTargetsRelative;

		var mergedGeometry = new BufferGeometry();

		var offset = 0;

		for ( var i = 0; i < geometries.length; ++ i ) {

			var geometry = geometries[ i ];
			var attributesCount = 0;

			// ensure that all geometries are indexed, or none

			if ( isIndexed !== ( geometry.index !== null ) ) {

				console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' + i + '. All geometries must have compatible attributes; make sure index attribute exists among all geometries, or in none of them.' );
				return null;

			}

			// gather attributes, exit early if they're different

			for ( var name in geometry.attributes ) {

				if ( ! attributesUsed.has( name ) ) {

					console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' + i + '. All geometries must have compatible attributes; make sure "' + name + '" attribute exists among all geometries, or in none of them.' );
					return null;

				}

				if ( attributes[ name ] === undefined ) attributes[ name ] = [];

				attributes[ name ].push( geometry.attributes[ name ] );

				attributesCount ++;

			}

			// ensure geometries have the same number of attributes

			if ( attributesCount !== attributesUsed.size ) {

				console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' + i + '. Make sure all geometries have the same number of attributes.' );
				return null;

			}

			// gather morph attributes, exit early if they're different

			if ( morphTargetsRelative !== geometry.morphTargetsRelative ) {

				console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' + i + '. .morphTargetsRelative must be consistent throughout all geometries.' );
				return null;

			}

			for ( var name in geometry.morphAttributes ) {

				if ( ! morphAttributesUsed.has( name ) ) {

					console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' + i + '.  .morphAttributes must be consistent throughout all geometries.' );
					return null;

				}

				if ( morphAttributes[ name ] === undefined ) morphAttributes[ name ] = [];

				morphAttributes[ name ].push( geometry.morphAttributes[ name ] );

			}

			// gather .userData

			mergedGeometry.userData.mergedUserData = mergedGeometry.userData.mergedUserData || [];
			mergedGeometry.userData.mergedUserData.push( geometry.userData );

			if ( useGroups ) {

				var count;

				if ( isIndexed ) {

					count = geometry.index.count;

				} else if ( geometry.attributes.position !== undefined ) {

					count = geometry.attributes.position.count;

				} else {

					console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' + i + '. The geometry must have either an index or a position attribute' );
					return null;

				}

				mergedGeometry.addGroup( offset, count, i );

				offset += count;

			}

		}

		// merge indices

		if ( isIndexed ) {

			var indexOffset = 0;
			var mergedIndex = [];

			for ( var i = 0; i < geometries.length; ++ i ) {

				var index = geometries[ i ].index;

				for ( var j = 0; j < index.count; ++ j ) {

					mergedIndex.push( index.getX( j ) + indexOffset );

				}

				indexOffset += geometries[ i ].attributes.position.count;

			}

			mergedGeometry.setIndex( mergedIndex );

		}

		// merge attributes

		for ( var name in attributes ) {

			var mergedAttribute = this.mergeBufferAttributes( attributes[ name ] );

			if ( ! mergedAttribute ) {

				console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed while trying to merge the ' + name + ' attribute.' );
				return null;

			}

			mergedGeometry.setAttribute( name, mergedAttribute );

		}

		// merge morph attributes

		for ( var name in morphAttributes ) {

			var numMorphTargets = morphAttributes[ name ][ 0 ].length;

			if ( numMorphTargets === 0 ) break;

			mergedGeometry.morphAttributes = mergedGeometry.morphAttributes || {};
			mergedGeometry.morphAttributes[ name ] = [];

			for ( var i = 0; i < numMorphTargets; ++ i ) {

				var morphAttributesToMerge = [];

				for ( var j = 0; j < morphAttributes[ name ].length; ++ j ) {

					morphAttributesToMerge.push( morphAttributes[ name ][ j ][ i ] );

				}

				var mergedMorphAttribute = this.mergeBufferAttributes( morphAttributesToMerge );

				if ( ! mergedMorphAttribute ) {

					console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed while trying to merge the ' + name + ' morphAttribute.' );
					return null;

				}

				mergedGeometry.morphAttributes[ name ].push( mergedMorphAttribute );

			}

		}

		return mergedGeometry;

	},

	/**
	 * @param {Array<BufferAttribute>} attributes
	 * @return {BufferAttribute}
	 */
	mergeBufferAttributes: function ( attributes ) {

		var TypedArray;
		var itemSize;
		var normalized;
		var arrayLength = 0;

		for ( var i = 0; i < attributes.length; ++ i ) {

			var attribute = attributes[ i ];

			if ( attribute.isInterleavedBufferAttribute ) {

				console.error( 'THREE.BufferGeometryUtils: .mergeBufferAttributes() failed. InterleavedBufferAttributes are not supported.' );
				return null;

			}

			if ( TypedArray === undefined ) TypedArray = attribute.array.constructor;
			if ( TypedArray !== attribute.array.constructor ) {

				console.error( 'THREE.BufferGeometryUtils: .mergeBufferAttributes() failed. BufferAttribute.array must be of consistent array types across matching attributes.' );
				return null;

			}

			if ( itemSize === undefined ) itemSize = attribute.itemSize;
			if ( itemSize !== attribute.itemSize ) {

				console.error( 'THREE.BufferGeometryUtils: .mergeBufferAttributes() failed. BufferAttribute.itemSize must be consistent across matching attributes.' );
				return null;

			}

			if ( normalized === undefined ) normalized = attribute.normalized;
			if ( normalized !== attribute.normalized ) {

				console.error( 'THREE.BufferGeometryUtils: .mergeBufferAttributes() failed. BufferAttribute.normalized must be consistent across matching attributes.' );
				return null;

			}

			arrayLength += attribute.array.length;

		}

		var array = new TypedArray( arrayLength );
		var offset = 0;

		for ( var i = 0; i < attributes.length; ++ i ) {

			array.set( attributes[ i ].array, offset );

			offset += attributes[ i ].array.length;

		}

		return new BufferAttribute( array, itemSize, normalized );

	},

	/**
	 * @param {Array<BufferAttribute>} attributes
	 * @return {Array<InterleavedBufferAttribute>}
	 */
	interleaveAttributes: function ( attributes ) {

		// Interleaves the provided attributes into an InterleavedBuffer and returns
		// a set of InterleavedBufferAttributes for each attribute
		var TypedArray;
		var arrayLength = 0;
		var stride = 0;

		// calculate the the length and type of the interleavedBuffer
		for ( var i = 0, l = attributes.length; i < l; ++ i ) {

			var attribute = attributes[ i ];

			if ( TypedArray === undefined ) TypedArray = attribute.array.constructor;
			if ( TypedArray !== attribute.array.constructor ) {

				console.error( 'AttributeBuffers of different types cannot be interleaved' );
				return null;

			}

			arrayLength += attribute.array.length;
			stride += attribute.itemSize;

		}

		// Create the set of buffer attributes
		var interleavedBuffer = new InterleavedBuffer( new TypedArray( arrayLength ), stride );
		var offset = 0;
		var res = [];
		var getters = [ 'getX', 'getY', 'getZ', 'getW' ];
		var setters = [ 'setX', 'setY', 'setZ', 'setW' ];

		for ( var j = 0, l = attributes.length; j < l; j ++ ) {

			var attribute = attributes[ j ];
			var itemSize = attribute.itemSize;
			var count = attribute.count;
			var iba = new InterleavedBufferAttribute( interleavedBuffer, itemSize, offset, attribute.normalized );
			res.push( iba );

			offset += itemSize;

			// Move the data for each attribute into the new interleavedBuffer
			// at the appropriate offset
			for ( var c = 0; c < count; c ++ ) {

				for ( var k = 0; k < itemSize; k ++ ) {

					iba[ setters[ k ] ]( c, attribute[ getters[ k ] ]( c ) );

				}

			}

		}

		return res;

	},

	/**
	 * @param {Array<BufferGeometry>} geometry
	 * @return {number}
	 */
	estimateBytesUsed: function ( geometry ) {

		// Return the estimated memory used by this geometry in bytes
		// Calculate using itemSize, count, and BYTES_PER_ELEMENT to account
		// for InterleavedBufferAttributes.
		var mem = 0;
		for ( var name in geometry.attributes ) {

			var attr = geometry.getAttribute( name );
			mem += attr.count * attr.itemSize * attr.array.BYTES_PER_ELEMENT;

		}

		var indices = geometry.getIndex();
		mem += indices ? indices.count * indices.itemSize * indices.array.BYTES_PER_ELEMENT : 0;
		return mem;

	},

	/**
	 * @param {BufferGeometry} geometry
	 * @param {number} tolerance
	 * @return {BufferGeometry>}
	 */
	mergeVertices: function ( geometry, tolerance = 1e-4 ) {

		tolerance = Math.max( tolerance, Number.EPSILON );

		// Generate an index buffer if the geometry doesn't have one, or optimize it
		// if it's already available.
		var hashToIndex = {};
		var indices = geometry.getIndex();
		var positions = geometry.getAttribute( 'position' );
		var vertexCount = indices ? indices.count : positions.count;

		// next value for triangle indices
		var nextIndex = 0;

		// attributes and new attribute arrays
		var attributeNames = Object.keys( geometry.attributes );
		var attrArrays = {};
		var morphAttrsArrays = {};
		var newIndices = [];
		var getters = [ 'getX', 'getY', 'getZ', 'getW' ];

		// initialize the arrays
		for ( var i = 0, l = attributeNames.length; i < l; i ++ ) {

			var name = attributeNames[ i ];

			attrArrays[ name ] = [];

			var morphAttr = geometry.morphAttributes[ name ];
			if ( morphAttr ) {

				morphAttrsArrays[ name ] = new Array( morphAttr.length ).fill().map( () => [] );

			}

		}

		// convert the error tolerance to an amount of decimal places to truncate to
		var decimalShift = Math.log10( 1 / tolerance );
		var shiftMultiplier = Math.pow( 10, decimalShift );
		for ( var i = 0; i < vertexCount; i ++ ) {

			var index = indices ? indices.getX( i ) : i;

			// Generate a hash for the vertex attributes at the current index 'i'
			var hash = '';
			for ( var j = 0, l = attributeNames.length; j < l; j ++ ) {

				var name = attributeNames[ j ];
				var attribute = geometry.getAttribute( name );
				var itemSize = attribute.itemSize;

				for ( var k = 0; k < itemSize; k ++ ) {

					// double tilde truncates the decimal value
					hash += `${ ~ ~ ( attribute[ getters[ k ] ]( index ) * shiftMultiplier ) },`;

				}

			}

			// Add another reference to the vertex if it's already
			// used by another index
			if ( hash in hashToIndex ) {

				newIndices.push( hashToIndex[ hash ] );

			} else {

				// copy data to the new index in the attribute arrays
				for ( var j = 0, l = attributeNames.length; j < l; j ++ ) {

					var name = attributeNames[ j ];
					var attribute = geometry.getAttribute( name );
					var morphAttr = geometry.morphAttributes[ name ];
					var itemSize = attribute.itemSize;
					var newarray = attrArrays[ name ];
					var newMorphArrays = morphAttrsArrays[ name ];

					for ( var k = 0; k < itemSize; k ++ ) {

						var getterFunc = getters[ k ];
						newarray.push( attribute[ getterFunc ]( index ) );

						if ( morphAttr ) {

							for ( var m = 0, ml = morphAttr.length; m < ml; m ++ ) {

								newMorphArrays[ m ].push( morphAttr[ m ][ getterFunc ]( index ) );

							}

						}

					}

				}

				hashToIndex[ hash ] = nextIndex;
				newIndices.push( nextIndex );
				nextIndex ++;

			}

		}

		// Generate typed arrays from new attribute arrays and update
		// the attributeBuffers
		const result = geometry.clone();
		for ( var i = 0, l = attributeNames.length; i < l; i ++ ) {

			var name = attributeNames[ i ];
			var oldAttribute = geometry.getAttribute( name );

			var buffer = new oldAttribute.array.constructor( attrArrays[ name ] );
			var attribute = new BufferAttribute( buffer, oldAttribute.itemSize, oldAttribute.normalized );

			result.setAttribute( name, attribute );

			// Update the attribute arrays
			if ( name in morphAttrsArrays ) {

				for ( var j = 0; j < morphAttrsArrays[ name ].length; j ++ ) {

					var oldMorphAttribute = geometry.morphAttributes[ name ][ j ];

					var buffer = new oldMorphAttribute.array.constructor( morphAttrsArrays[ name ][ j ] );
					var morphAttribute = new BufferAttribute( buffer, oldMorphAttribute.itemSize, oldMorphAttribute.normalized );
					result.morphAttributes[ name ][ j ] = morphAttribute;

				}

			}

		}

		// indices

		result.setIndex( newIndices );

		return result;

	},

	/**
	 * @param {BufferGeometry} geometry
	 * @param {number} drawMode
	 * @return {BufferGeometry>}
	 */
	toTrianglesDrawMode: function ( geometry, drawMode ) {

		if ( drawMode === TrianglesDrawMode ) {

			console.warn( 'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Geometry already defined as triangles.' );
			return geometry;

		}

		if ( drawMode === TriangleFanDrawMode || drawMode === TriangleStripDrawMode ) {

			var index = geometry.getIndex();

			// generate index if not present

			if ( index === null ) {

				var indices = [];

				var position = geometry.getAttribute( 'position' );

				if ( position !== undefined ) {

					for ( var i = 0; i < position.count; i ++ ) {

						indices.push( i );

					}

					geometry.setIndex( indices );
					index = geometry.getIndex();

				} else {

					console.error( 'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Undefined position attribute. Processing not possible.' );
					return geometry;

				}

			}

			//

			var numberOfTriangles = index.count - 2;
			var newIndices = [];

			if ( drawMode === TriangleFanDrawMode ) {

				// gl.TRIANGLE_FAN

				for ( var i = 1; i <= numberOfTriangles; i ++ ) {

					newIndices.push( index.getX( 0 ) );
					newIndices.push( index.getX( i ) );
					newIndices.push( index.getX( i + 1 ) );

				}

			} else {

				// gl.TRIANGLE_STRIP

				for ( var i = 0; i < numberOfTriangles; i ++ ) {

					if ( i % 2 === 0 ) {

						newIndices.push( index.getX( i ) );
						newIndices.push( index.getX( i + 1 ) );
						newIndices.push( index.getX( i + 2 ) );


					} else {

						newIndices.push( index.getX( i + 2 ) );
						newIndices.push( index.getX( i + 1 ) );
						newIndices.push( index.getX( i ) );

					}

				}

			}

			if ( ( newIndices.length / 3 ) !== numberOfTriangles ) {

				console.error( 'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Unable to generate correct amount of triangles.' );

			}

			// build final geometry

			var newGeometry = geometry.clone();
			newGeometry.setIndex( newIndices );
			newGeometry.clearGroups();

			return newGeometry;

		} else {

			console.error( 'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Unknown draw mode:', drawMode );
			return geometry;

		}

	}

}

GLTFLoader = ( function () {

	function GLTFLoader( manager ) {

		Loader.call( this, manager );

		this.dracoLoader = null;
		this.ddsLoader = null;

	}

	GLTFLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: GLTFLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			var scope = this;

			var resourcePath;

			if ( this.resourcePath !== '' ) {

				resourcePath = this.resourcePath;

			} else if ( this.path !== '' ) {

				resourcePath = this.path;

			} else {

				resourcePath = LoaderUtils.extractUrlBase( url );

			}

			// Tells the LoadingManager to track an extra item, which resolves after
			// the model is fully loaded. This means the count of items loaded will
			// be incorrect, but ensures manager.onLoad() does not fire early.
			scope.manager.itemStart( url );

			var _onError = function ( e ) {

				if ( onError ) {

					onError( e );

				} else {

					console.error( e );

				}

				scope.manager.itemError( url );
				scope.manager.itemEnd( url );

			};

			var loader = new FileLoader( scope.manager );

			loader.setPath( this.path );
			loader.setResponseType( 'arraybuffer' );

			if ( scope.crossOrigin === 'use-credentials' ) {

				loader.setWithCredentials( true );

			}

			loader.load( url, function ( data ) {

				try {

					scope.parse( data, resourcePath, function ( gltf ) {

						onLoad( gltf );

						scope.manager.itemEnd( url );

					}, _onError );

				} catch ( e ) {

					_onError( e );

				}

			}, onProgress, _onError );

		},

		setDRACOLoader: function ( dracoLoader ) {

			this.dracoLoader = dracoLoader;
			return this;

		},

		setDDSLoader: function ( ddsLoader ) {

			this.ddsLoader = ddsLoader;
			return this;

		},

		parse: function ( data, path, onLoad, onError ) {

			var content;
			var extensions = {};

			if ( typeof data === 'string' ) {

				content = data;

			} else {

				var magic = LoaderUtils.decodeText( new Uint8Array( data, 0, 4 ) );

				if ( magic === BINARY_EXTENSION_HEADER_MAGIC ) {

					try {

						extensions[ EXTENSIONS.KHR_BINARY_GLTF ] = new GLTFBinaryExtension( data );

					} catch ( error ) {

						if ( onError ) onError( error );
						return;

					}

					content = extensions[ EXTENSIONS.KHR_BINARY_GLTF ].content;

				} else {

					content = LoaderUtils.decodeText( new Uint8Array( data ) );

				}

			}

			var json = JSON.parse( content );

			if ( json.asset === undefined || json.asset.version[ 0 ] < 2 ) {

				if ( onError ) onError( new Error( 'THREE.GLTFLoader: Unsupported asset. glTF versions >=2.0 are supported.' ) );
				return;

			}

			if ( json.extensionsUsed ) {

				for ( var i = 0; i < json.extensionsUsed.length; ++ i ) {

					var extensionName = json.extensionsUsed[ i ];
					var extensionsRequired = json.extensionsRequired || [];

					switch ( extensionName ) {

						case EXTENSIONS.KHR_LIGHTS_PUNCTUAL:
							extensions[ extensionName ] = new GLTFLightsExtension( json );
							break;

						case EXTENSIONS.KHR_MATERIALS_CLEARCOAT:
							extensions[ extensionName ] = new GLTFMaterialsClearcoatExtension();
							break;

						case EXTENSIONS.KHR_MATERIALS_UNLIT:
							extensions[ extensionName ] = new GLTFMaterialsUnlitExtension();
							break;

						case EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS:
							extensions[ extensionName ] = new GLTFMaterialsPbrSpecularGlossinessExtension();
							break;

						case EXTENSIONS.KHR_DRACO_MESH_COMPRESSION:
							extensions[ extensionName ] = new GLTFDracoMeshCompressionExtension( json, this.dracoLoader );
							break;

						case EXTENSIONS.MSFT_TEXTURE_DDS:
							extensions[ extensionName ] = new GLTFTextureDDSExtension( this.ddsLoader );
							break;

						case EXTENSIONS.KHR_TEXTURE_TRANSFORM:
							extensions[ extensionName ] = new GLTFTextureTransformExtension();
							break;

						case EXTENSIONS.KHR_MESH_QUANTIZATION:
							extensions[ extensionName ] = new GLTFMeshQuantizationExtension();
							break;

						default:

							if ( extensionsRequired.indexOf( extensionName ) >= 0 ) {

								console.warn( 'THREE.GLTFLoader: Unknown extension "' + extensionName + '".' );

							}

					}

				}

			}

			var parser = new GLTFParser( json, extensions, {

				path: path || this.resourcePath || '',
				crossOrigin: this.crossOrigin,
				manager: this.manager

			} );

			parser.parse( onLoad, onError );

		}

	} );

	/* GLTFREGISTRY */

	function GLTFRegistry() {

		var objects = {};

		return	{

			get: function ( key ) {

				return objects[ key ];

			},

			add: function ( key, object ) {

				objects[ key ] = object;

			},

			remove: function ( key ) {

				delete objects[ key ];

			},

			removeAll: function () {

				objects = {};

			}

		};

	}

	/*********************************/
	/********** EXTENSIONS ***********/
	/*********************************/

	var EXTENSIONS = {
		KHR_BINARY_GLTF: 'KHR_binary_glTF',
		KHR_DRACO_MESH_COMPRESSION: 'KHR_draco_mesh_compression',
		KHR_LIGHTS_PUNCTUAL: 'KHR_lights_punctual',
		KHR_MATERIALS_CLEARCOAT: 'KHR_materials_clearcoat',
		KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS: 'KHR_materials_pbrSpecularGlossiness',
		KHR_MATERIALS_UNLIT: 'KHR_materials_unlit',
		KHR_TEXTURE_TRANSFORM: 'KHR_texture_transform',
		KHR_MESH_QUANTIZATION: 'KHR_mesh_quantization',
		MSFT_TEXTURE_DDS: 'MSFT_texture_dds'
	};

	/**
	 * DDS Texture Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/MSFT_texture_dds
	 *
	 */
	function GLTFTextureDDSExtension( ddsLoader ) {

		if ( ! ddsLoader ) {

			throw new Error( 'THREE.GLTFLoader: Attempting to load .dds texture without importing DDSLoader' );

		}

		this.name = EXTENSIONS.MSFT_TEXTURE_DDS;
		this.ddsLoader = ddsLoader;

	}

	/**
	 * Punctual Lights Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_lights_punctual
	 */
	function GLTFLightsExtension( json ) {

		this.name = EXTENSIONS.KHR_LIGHTS_PUNCTUAL;

		var extension = ( json.extensions && json.extensions[ EXTENSIONS.KHR_LIGHTS_PUNCTUAL ] ) || {};
		this.lightDefs = extension.lights || [];

	}

	GLTFLightsExtension.prototype.loadLight = function ( lightIndex ) {

		var lightDef = this.lightDefs[ lightIndex ];
		var lightNode;

		var color = new Color( 0xffffff );
		if ( lightDef.color !== undefined ) color.fromArray( lightDef.color );

		var range = lightDef.range !== undefined ? lightDef.range : 0;

		switch ( lightDef.type ) {

			case 'directional':
				lightNode = new DirectionalLight( color );
				lightNode.target.position.set( 0, 0, - 1 );
				lightNode.add( lightNode.target );
				break;

			case 'point':
				lightNode = new PointLight( color );
				lightNode.distance = range;
				break;

			case 'spot':
				lightNode = new SpotLight( color );
				lightNode.distance = range;
				// Handle spotlight properties.
				lightDef.spot = lightDef.spot || {};
				lightDef.spot.innerConeAngle = lightDef.spot.innerConeAngle !== undefined ? lightDef.spot.innerConeAngle : 0;
				lightDef.spot.outerConeAngle = lightDef.spot.outerConeAngle !== undefined ? lightDef.spot.outerConeAngle : Math.PI / 4.0;
				lightNode.angle = lightDef.spot.outerConeAngle;
				lightNode.penumbra = 1.0 - lightDef.spot.innerConeAngle / lightDef.spot.outerConeAngle;
				lightNode.target.position.set( 0, 0, - 1 );
				lightNode.add( lightNode.target );
				break;

			default:
				throw new Error( 'THREE.GLTFLoader: Unexpected light type, "' + lightDef.type + '".' );

		}

		// Some lights (e.g. spot) default to a position other than the origin. Reset the position
		// here, because node-level parsing will only override position if explicitly specified.
		lightNode.position.set( 0, 0, 0 );

		lightNode.decay = 2;

		if ( lightDef.intensity !== undefined ) lightNode.intensity = lightDef.intensity;

		lightNode.name = lightDef.name || ( 'light_' + lightIndex );

		return Promise.resolve( lightNode );

	};

	/**
	 * Unlit Materials Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_unlit
	 */
	function GLTFMaterialsUnlitExtension() {

		this.name = EXTENSIONS.KHR_MATERIALS_UNLIT;

	}

	GLTFMaterialsUnlitExtension.prototype.getMaterialType = function () {

		return MeshBasicMaterial;

	};

	GLTFMaterialsUnlitExtension.prototype.extendParams = function ( materialParams, materialDef, parser ) {

		var pending = [];

		materialParams.color = new Color( 1.0, 1.0, 1.0 );
		materialParams.opacity = 1.0;

		var metallicRoughness = materialDef.pbrMetallicRoughness;

		if ( metallicRoughness ) {

			if ( Array.isArray( metallicRoughness.baseColorFactor ) ) {

				var array = metallicRoughness.baseColorFactor;

				materialParams.color.fromArray( array );
				materialParams.opacity = array[ 3 ];

			}

			if ( metallicRoughness.baseColorTexture !== undefined ) {

				pending.push( parser.assignTexture( materialParams, 'map', metallicRoughness.baseColorTexture ) );

			}

		}

		return Promise.all( pending );

	};

	/**
	 * Clearcoat Materials Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_clearcoat
	 */
	function GLTFMaterialsClearcoatExtension() {

		this.name = EXTENSIONS.KHR_MATERIALS_CLEARCOAT;

	}

	GLTFMaterialsClearcoatExtension.prototype.getMaterialType = function () {

		return MeshPhysicalMaterial;

	};

	GLTFMaterialsClearcoatExtension.prototype.extendParams = function ( materialParams, materialDef, parser ) {

		var pending = [];

		var extension = materialDef.extensions[ this.name ];

		if ( extension.clearcoatFactor !== undefined ) {

			materialParams.clearcoat = extension.clearcoatFactor;

		}

		if ( extension.clearcoatTexture !== undefined ) {

			pending.push( parser.assignTexture( materialParams, 'clearcoatMap', extension.clearcoatTexture ) );

		}

		if ( extension.clearcoatRoughnessFactor !== undefined ) {

			materialParams.clearcoatRoughness = extension.clearcoatRoughnessFactor;

		}

		if ( extension.clearcoatRoughnessTexture !== undefined ) {

			pending.push( parser.assignTexture( materialParams, 'clearcoatRoughnessMap', extension.clearcoatRoughnessTexture ) );

		}

		if ( extension.clearcoatNormalTexture !== undefined ) {

			pending.push( parser.assignTexture( materialParams, 'clearcoatNormalMap', extension.clearcoatNormalTexture ) );

			if ( extension.clearcoatNormalTexture.scale !== undefined ) {

				var scale = extension.clearcoatNormalTexture.scale;

				materialParams.clearcoatNormalScale = new Vector2( scale, scale );

			}

		}

		return Promise.all( pending );

	};

	/* BINARY EXTENSION */
	var BINARY_EXTENSION_HEADER_MAGIC = 'glTF';
	var BINARY_EXTENSION_HEADER_LENGTH = 12;
	var BINARY_EXTENSION_CHUNK_TYPES = { JSON: 0x4E4F534A, BIN: 0x004E4942 };

	function GLTFBinaryExtension( data ) {

		this.name = EXTENSIONS.KHR_BINARY_GLTF;
		this.content = null;
		this.body = null;

		var headerView = new DataView( data, 0, BINARY_EXTENSION_HEADER_LENGTH );

		this.header = {
			magic: LoaderUtils.decodeText( new Uint8Array( data.slice( 0, 4 ) ) ),
			version: headerView.getUint32( 4, true ),
			length: headerView.getUint32( 8, true )
		};

		if ( this.header.magic !== BINARY_EXTENSION_HEADER_MAGIC ) {

			throw new Error( 'THREE.GLTFLoader: Unsupported glTF-Binary header.' );

		} else if ( this.header.version < 2.0 ) {

			throw new Error( 'THREE.GLTFLoader: Legacy binary file detected.' );

		}

		var chunkView = new DataView( data, BINARY_EXTENSION_HEADER_LENGTH );
		var chunkIndex = 0;

		while ( chunkIndex < chunkView.byteLength ) {

			var chunkLength = chunkView.getUint32( chunkIndex, true );
			chunkIndex += 4;

			var chunkType = chunkView.getUint32( chunkIndex, true );
			chunkIndex += 4;

			if ( chunkType === BINARY_EXTENSION_CHUNK_TYPES.JSON ) {

				var contentArray = new Uint8Array( data, BINARY_EXTENSION_HEADER_LENGTH + chunkIndex, chunkLength );
				this.content = LoaderUtils.decodeText( contentArray );

			} else if ( chunkType === BINARY_EXTENSION_CHUNK_TYPES.BIN ) {

				var byteOffset = BINARY_EXTENSION_HEADER_LENGTH + chunkIndex;
				this.body = data.slice( byteOffset, byteOffset + chunkLength );

			}

			// Clients must ignore chunks with unknown types.

			chunkIndex += chunkLength;

		}

		if ( this.content === null ) {

			throw new Error( 'THREE.GLTFLoader: JSON content not found.' );

		}

	}

	/**
	 * DRACO Mesh Compression Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_draco_mesh_compression
	 */
	function GLTFDracoMeshCompressionExtension( json, dracoLoader ) {

		if ( ! dracoLoader ) {

			throw new Error( 'THREE.GLTFLoader: No DRACOLoader instance provided.' );

		}

		this.name = EXTENSIONS.KHR_DRACO_MESH_COMPRESSION;
		this.json = json;
		this.dracoLoader = dracoLoader;
		this.dracoLoader.preload();

	}

	GLTFDracoMeshCompressionExtension.prototype.decodePrimitive = function ( primitive, parser ) {

		var json = this.json;
		var dracoLoader = this.dracoLoader;
		var bufferViewIndex = primitive.extensions[ this.name ].bufferView;
		var gltfAttributeMap = primitive.extensions[ this.name ].attributes;
		var threeAttributeMap = {};
		var attributeNormalizedMap = {};
		var attributeTypeMap = {};

		for ( var attributeName in gltfAttributeMap ) {

			var threeAttributeName = ATTRIBUTES[ attributeName ] || attributeName.toLowerCase();

			threeAttributeMap[ threeAttributeName ] = gltfAttributeMap[ attributeName ];

		}

		for ( attributeName in primitive.attributes ) {

			var threeAttributeName = ATTRIBUTES[ attributeName ] || attributeName.toLowerCase();

			if ( gltfAttributeMap[ attributeName ] !== undefined ) {

				var accessorDef = json.accessors[ primitive.attributes[ attributeName ] ];
				var componentType = WEBGL_COMPONENT_TYPES[ accessorDef.componentType ];

				attributeTypeMap[ threeAttributeName ] = componentType;
				attributeNormalizedMap[ threeAttributeName ] = accessorDef.normalized === true;

			}

		}

		return parser.getDependency( 'bufferView', bufferViewIndex ).then( function ( bufferView ) {

			return new Promise( function ( resolve ) {

				dracoLoader.decodeDracoFile( bufferView, function ( geometry ) {

					for ( var attributeName in geometry.attributes ) {

						var attribute = geometry.attributes[ attributeName ];
						var normalized = attributeNormalizedMap[ attributeName ];

						if ( normalized !== undefined ) attribute.normalized = normalized;

					}

					resolve( geometry );

				}, threeAttributeMap, attributeTypeMap );

			} );

		} );

	};

	/**
	 * Texture Transform Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_texture_transform
	 */
	function GLTFTextureTransformExtension() {

		this.name = EXTENSIONS.KHR_TEXTURE_TRANSFORM;

	}

	GLTFTextureTransformExtension.prototype.extendTexture = function ( texture, transform ) {

		texture = texture.clone();

		if ( transform.offset !== undefined ) {

			texture.offset.fromArray( transform.offset );

		}

		if ( transform.rotation !== undefined ) {

			texture.rotation = transform.rotation;

		}

		if ( transform.scale !== undefined ) {

			texture.repeat.fromArray( transform.scale );

		}

		if ( transform.texCoord !== undefined ) {

			console.warn( 'THREE.GLTFLoader: Custom UV sets in "' + this.name + '" extension not yet supported.' );

		}

		texture.needsUpdate = true;

		return texture;

	};

	/**
	 * Specular-Glossiness Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_pbrSpecularGlossiness
	 */

	/**
	 * A sub class of StandardMaterial with some of the functionality
	 * changed via the `onBeforeCompile` callback
	 * @pailhead
	 */

	function GLTFMeshStandardSGMaterial( params ) {

		MeshStandardMaterial.call( this );

		this.isGLTFSpecularGlossinessMaterial = true;

		//various chunks that need replacing
		var specularMapParsFragmentChunk = [
			'#ifdef USE_SPECULARMAP',
			'	uniform sampler2D specularMap;',
			'#endif'
		].join( '\n' );

		var glossinessMapParsFragmentChunk = [
			'#ifdef USE_GLOSSINESSMAP',
			'	uniform sampler2D glossinessMap;',
			'#endif'
		].join( '\n' );

		var specularMapFragmentChunk = [
			'vec3 specularFactor = specular;',
			'#ifdef USE_SPECULARMAP',
			'	vec4 texelSpecular = texture2D( specularMap, vUv );',
			'	texelSpecular = sRGBToLinear( texelSpecular );',
			'	// reads channel RGB, compatible with a glTF Specular-Glossiness (RGBA) texture',
			'	specularFactor *= texelSpecular.rgb;',
			'#endif'
		].join( '\n' );

		var glossinessMapFragmentChunk = [
			'float glossinessFactor = glossiness;',
			'#ifdef USE_GLOSSINESSMAP',
			'	vec4 texelGlossiness = texture2D( glossinessMap, vUv );',
			'	// reads channel A, compatible with a glTF Specular-Glossiness (RGBA) texture',
			'	glossinessFactor *= texelGlossiness.a;',
			'#endif'
		].join( '\n' );

		var lightPhysicalFragmentChunk = [
			'PhysicalMaterial material;',
			'material.diffuseColor = diffuseColor.rgb;',
			'vec3 dxy = max( abs( dFdx( geometryNormal ) ), abs( dFdy( geometryNormal ) ) );',
			'float geometryRoughness = max( max( dxy.x, dxy.y ), dxy.z );',
			'material.specularRoughness = max( 1.0 - glossinessFactor, 0.0525 );// 0.0525 corresponds to the base mip of a 256 cubemap.',
			'material.specularRoughness += geometryRoughness;',
			'material.specularRoughness = min( material.specularRoughness, 1.0 );',
			'material.specularColor = specularFactor.rgb;',
		].join( '\n' );

		var uniforms = {
			specular: { value: new Color().setHex( 0xffffff ) },
			glossiness: { value: 1 },
			specularMap: { value: null },
			glossinessMap: { value: null }
		};

		this._extraUniforms = uniforms;

		// please see #14031 or #13198 for an alternate approach
		this.onBeforeCompile = function ( shader ) {

			for ( var uniformName in uniforms ) {

				shader.uniforms[ uniformName ] = uniforms[ uniformName ];

			}

			shader.fragmentShader = shader.fragmentShader.replace( 'uniform float roughness;', 'uniform vec3 specular;' );
			shader.fragmentShader = shader.fragmentShader.replace( 'uniform float metalness;', 'uniform float glossiness;' );
			shader.fragmentShader = shader.fragmentShader.replace( '#include <roughnessmap_pars_fragment>', specularMapParsFragmentChunk );
			shader.fragmentShader = shader.fragmentShader.replace( '#include <metalnessmap_pars_fragment>', glossinessMapParsFragmentChunk );
			shader.fragmentShader = shader.fragmentShader.replace( '#include <roughnessmap_fragment>', specularMapFragmentChunk );
			shader.fragmentShader = shader.fragmentShader.replace( '#include <metalnessmap_fragment>', glossinessMapFragmentChunk );
			shader.fragmentShader = shader.fragmentShader.replace( '#include <lights_physical_fragment>', lightPhysicalFragmentChunk );

		};

		/*eslint-disable*/
		Object.defineProperties(
			this,
			{
				specular: {
					get: function () { return uniforms.specular.value; },
					set: function ( v ) { uniforms.specular.value = v; }
				},
				specularMap: {
					get: function () { return uniforms.specularMap.value; },
					set: function ( v ) { uniforms.specularMap.value = v; }
				},
				glossiness: {
					get: function () { return uniforms.glossiness.value; },
					set: function ( v ) { uniforms.glossiness.value = v; }
				},
				glossinessMap: {
					get: function () { return uniforms.glossinessMap.value; },
					set: function ( v ) {

						uniforms.glossinessMap.value = v;
						//how about something like this - @pailhead
						if ( v ) {

							this.defines.USE_GLOSSINESSMAP = '';
							// set USE_ROUGHNESSMAP to enable vUv
							this.defines.USE_ROUGHNESSMAP = '';

						} else {

							delete this.defines.USE_ROUGHNESSMAP;
							delete this.defines.USE_GLOSSINESSMAP;

						}

					}
				}
			}
		);

		/*eslint-enable*/
		delete this.metalness;
		delete this.roughness;
		delete this.metalnessMap;
		delete this.roughnessMap;

		this.setValues( params );

	}

	GLTFMeshStandardSGMaterial.prototype = Object.create( MeshStandardMaterial.prototype );
	GLTFMeshStandardSGMaterial.prototype.constructor = GLTFMeshStandardSGMaterial;

	GLTFMeshStandardSGMaterial.prototype.copy = function ( source ) {

		MeshStandardMaterial.prototype.copy.call( this, source );
		this.specularMap = source.specularMap;
		this.specular.copy( source.specular );
		this.glossinessMap = source.glossinessMap;
		this.glossiness = source.glossiness;
		delete this.metalness;
		delete this.roughness;
		delete this.metalnessMap;
		delete this.roughnessMap;
		return this;

	};

	function GLTFMaterialsPbrSpecularGlossinessExtension() {

		return {

			name: EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS,

			specularGlossinessParams: [
				'color',
				'map',
				'lightMap',
				'lightMapIntensity',
				'aoMap',
				'aoMapIntensity',
				'emissive',
				'emissiveIntensity',
				'emissiveMap',
				'bumpMap',
				'bumpScale',
				'normalMap',
				'normalMapType',
				'displacementMap',
				'displacementScale',
				'displacementBias',
				'specularMap',
				'specular',
				'glossinessMap',
				'glossiness',
				'alphaMap',
				'envMap',
				'envMapIntensity',
				'refractionRatio',
			],

			getMaterialType: function () {

				return GLTFMeshStandardSGMaterial;

			},

			extendParams: function ( materialParams, materialDef, parser ) {

				var pbrSpecularGlossiness = materialDef.extensions[ this.name ];

				materialParams.color = new Color( 1.0, 1.0, 1.0 );
				materialParams.opacity = 1.0;

				var pending = [];

				if ( Array.isArray( pbrSpecularGlossiness.diffuseFactor ) ) {

					var array = pbrSpecularGlossiness.diffuseFactor;

					materialParams.color.fromArray( array );
					materialParams.opacity = array[ 3 ];

				}

				if ( pbrSpecularGlossiness.diffuseTexture !== undefined ) {

					pending.push( parser.assignTexture( materialParams, 'map', pbrSpecularGlossiness.diffuseTexture ) );

				}

				materialParams.emissive = new Color( 0.0, 0.0, 0.0 );
				materialParams.glossiness = pbrSpecularGlossiness.glossinessFactor !== undefined ? pbrSpecularGlossiness.glossinessFactor : 1.0;
				materialParams.specular = new Color( 1.0, 1.0, 1.0 );

				if ( Array.isArray( pbrSpecularGlossiness.specularFactor ) ) {

					materialParams.specular.fromArray( pbrSpecularGlossiness.specularFactor );

				}

				if ( pbrSpecularGlossiness.specularGlossinessTexture !== undefined ) {

					var specGlossMapDef = pbrSpecularGlossiness.specularGlossinessTexture;
					pending.push( parser.assignTexture( materialParams, 'glossinessMap', specGlossMapDef ) );
					pending.push( parser.assignTexture( materialParams, 'specularMap', specGlossMapDef ) );

				}

				return Promise.all( pending );

			},

			createMaterial: function ( materialParams ) {

				var material = new GLTFMeshStandardSGMaterial( materialParams );
				material.fog = true;

				material.color = materialParams.color;

				material.map = materialParams.map === undefined ? null : materialParams.map;

				material.lightMap = null;
				material.lightMapIntensity = 1.0;

				material.aoMap = materialParams.aoMap === undefined ? null : materialParams.aoMap;
				material.aoMapIntensity = 1.0;

				material.emissive = materialParams.emissive;
				material.emissiveIntensity = 1.0;
				material.emissiveMap = materialParams.emissiveMap === undefined ? null : materialParams.emissiveMap;

				material.bumpMap = materialParams.bumpMap === undefined ? null : materialParams.bumpMap;
				material.bumpScale = 1;

				material.normalMap = materialParams.normalMap === undefined ? null : materialParams.normalMap;
				material.normalMapType = TangentSpaceNormalMap;

				if ( materialParams.normalScale ) material.normalScale = materialParams.normalScale;

				material.displacementMap = null;
				material.displacementScale = 1;
				material.displacementBias = 0;

				material.specularMap = materialParams.specularMap === undefined ? null : materialParams.specularMap;
				material.specular = materialParams.specular;

				material.glossinessMap = materialParams.glossinessMap === undefined ? null : materialParams.glossinessMap;
				material.glossiness = materialParams.glossiness;

				material.alphaMap = null;

				material.envMap = materialParams.envMap === undefined ? null : materialParams.envMap;
				material.envMapIntensity = 1.0;

				material.refractionRatio = 0.98;

				return material;

			},

		};

	}

	/**
	 * Mesh Quantization Extension
	 *
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_mesh_quantization
	 */
	function GLTFMeshQuantizationExtension() {

		this.name = EXTENSIONS.KHR_MESH_QUANTIZATION;

	}

	/*********************************/
	/********** INTERPOLATION ********/
	/*********************************/

	// Spline Interpolation
	// Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#appendix-c-spline-interpolation
	function GLTFCubicSplineInterpolant( parameterPositions, sampleValues, sampleSize, resultBuffer ) {

		Interpolant.call( this, parameterPositions, sampleValues, sampleSize, resultBuffer );

	}

	GLTFCubicSplineInterpolant.prototype = Object.create( Interpolant.prototype );
	GLTFCubicSplineInterpolant.prototype.constructor = GLTFCubicSplineInterpolant;

	GLTFCubicSplineInterpolant.prototype.copySampleValue_ = function ( index ) {

		// Copies a sample value to the result buffer. See description of glTF
		// CUBICSPLINE values layout in interpolate_() function below.

		var result = this.resultBuffer,
			values = this.sampleValues,
			valueSize = this.valueSize,
			offset = index * valueSize * 3 + valueSize;

		for ( var i = 0; i !== valueSize; i ++ ) {

			result[ i ] = values[ offset + i ];

		}

		return result;

	};

	GLTFCubicSplineInterpolant.prototype.beforeStart_ = GLTFCubicSplineInterpolant.prototype.copySampleValue_;

	GLTFCubicSplineInterpolant.prototype.afterEnd_ = GLTFCubicSplineInterpolant.prototype.copySampleValue_;

	GLTFCubicSplineInterpolant.prototype.interpolate_ = function ( i1, t0, t, t1 ) {

		var result = this.resultBuffer;
		var values = this.sampleValues;
		var stride = this.valueSize;

		var stride2 = stride * 2;
		var stride3 = stride * 3;

		var td = t1 - t0;

		var p = ( t - t0 ) / td;
		var pp = p * p;
		var ppp = pp * p;

		var offset1 = i1 * stride3;
		var offset0 = offset1 - stride3;

		var s2 = - 2 * ppp + 3 * pp;
		var s3 = ppp - pp;
		var s0 = 1 - s2;
		var s1 = s3 - pp + p;

		// Layout of keyframe output values for CUBICSPLINE animations:
		//   [ inTangent_1, splineVertex_1, outTangent_1, inTangent_2, splineVertex_2, ... ]
		for ( var i = 0; i !== stride; i ++ ) {

			var p0 = values[ offset0 + i + stride ]; // splineVertex_k
			var m0 = values[ offset0 + i + stride2 ] * td; // outTangent_k * (t_k+1 - t_k)
			var p1 = values[ offset1 + i + stride ]; // splineVertex_k+1
			var m1 = values[ offset1 + i ] * td; // inTangent_k+1 * (t_k+1 - t_k)

			result[ i ] = s0 * p0 + s1 * m0 + s2 * p1 + s3 * m1;

		}

		return result;

	};

	/*********************************/
	/********** INTERNALS ************/
	/*********************************/

	/* CONSTANTS */

	var WEBGL_CONSTANTS = {
		FLOAT: 5126,
		//FLOAT_MAT2: 35674,
		FLOAT_MAT3: 35675,
		FLOAT_MAT4: 35676,
		FLOAT_VEC2: 35664,
		FLOAT_VEC3: 35665,
		FLOAT_VEC4: 35666,
		LINEAR: 9729,
		REPEAT: 10497,
		SAMPLER_2D: 35678,
		POINTS: 0,
		LINES: 1,
		LINE_LOOP: 2,
		LINE_STRIP: 3,
		TRIANGLES: 4,
		TRIANGLE_STRIP: 5,
		TRIANGLE_FAN: 6,
		UNSIGNED_BYTE: 5121,
		UNSIGNED_SHORT: 5123
	};

	var WEBGL_COMPONENT_TYPES = {
		5120: Int8Array,
		5121: Uint8Array,
		5122: Int16Array,
		5123: Uint16Array,
		5125: Uint32Array,
		5126: Float32Array
	};

	var WEBGL_FILTERS = {
		9728: NearestFilter,
		9729: LinearFilter,
		9984: NearestMipmapNearestFilter,
		9985: LinearMipmapNearestFilter,
		9986: NearestMipmapLinearFilter,
		9987: LinearMipmapLinearFilter
	};

	var WEBGL_WRAPPINGS = {
		33071: ClampToEdgeWrapping,
		33648: MirroredRepeatWrapping,
		10497: RepeatWrapping
	};

	var WEBGL_TYPE_SIZES = {
		'SCALAR': 1,
		'VEC2': 2,
		'VEC3': 3,
		'VEC4': 4,
		'MAT2': 4,
		'MAT3': 9,
		'MAT4': 16
	};

	var ATTRIBUTES = {
		POSITION: 'position',
		NORMAL: 'normal',
		TANGENT: 'tangent',
		TEXCOORD_0: 'uv',
		TEXCOORD_1: 'uv2',
		COLOR_0: 'color',
		WEIGHTS_0: 'skinWeight',
		JOINTS_0: 'skinIndex',
	};

	var PATH_PROPERTIES = {
		scale: 'scale',
		translation: 'position',
		rotation: 'quaternion',
		weights: 'morphTargetInfluences'
	};

	var INTERPOLATION = {
		CUBICSPLINE: undefined, // We use a custom interpolant (GLTFCubicSplineInterpolation) for CUBICSPLINE tracks. Each
		                        // keyframe track will be initialized with a default interpolation type, then modified.
		LINEAR: InterpolateLinear,
		STEP: InterpolateDiscrete
	};

	var ALPHA_MODES = {
		OPAQUE: 'OPAQUE',
		MASK: 'MASK',
		BLEND: 'BLEND'
	};

	var MIME_TYPE_FORMATS = {
		'image/png': RGBAFormat,
		'image/jpeg': RGBFormat
	};

	/* UTILITY FUNCTIONS */

	function resolveURL( url, path ) {

		// Invalid URL
		if ( typeof url !== 'string' || url === '' ) return '';

		// Host Relative URL
		if ( /^https?:\/\//i.test( path ) && /^\//.test( url ) ) {

			path = path.replace( /(^https?:\/\/[^\/]+).*/i, '$1' );

		}

		// Absolute URL http://,https://,//
		if ( /^(https?:)?\/\//i.test( url ) ) return url;

		// Data URI
		if ( /^data:.*,.*$/i.test( url ) ) return url;

		// Blob URL
		if ( /^blob:.*$/i.test( url ) ) return url;

		// Relative URL
		return path + url;

	}

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#default-material
	 */
	function createDefaultMaterial( cache ) {

		if ( cache[ 'DefaultMaterial' ] === undefined ) {

			cache[ 'DefaultMaterial' ] = new MeshStandardMaterial( {
				color: 0xFFFFFF,
				emissive: 0x000000,
				metalness: 1,
				roughness: 1,
				transparent: false,
				depthTest: true,
				side: FrontSide
			} );

		}

		return cache[ 'DefaultMaterial' ];

	}

	function addUnknownExtensionsToUserData( knownExtensions, object, objectDef ) {

		// Add unknown glTF extensions to an object's userData.

		for ( var name in objectDef.extensions ) {

			if ( knownExtensions[ name ] === undefined ) {

				object.userData.gltfExtensions = object.userData.gltfExtensions || {};
				object.userData.gltfExtensions[ name ] = objectDef.extensions[ name ];

			}

		}

	}

	/**
	 * @param {Object3D|Material|BufferGeometry} object
	 * @param {GLTF.definition} gltfDef
	 */
	function assignExtrasToUserData( object, gltfDef ) {

		if ( gltfDef.extras !== undefined ) {

			if ( typeof gltfDef.extras === 'object' ) {

				Object.assign( object.userData, gltfDef.extras );

			} else {

				console.warn( 'THREE.GLTFLoader: Ignoring primitive type .extras, ' + gltfDef.extras );

			}

		}

	}

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#morph-targets
	 *
	 * @param {BufferGeometry} geometry
	 * @param {Array<GLTF.Target>} targets
	 * @param {GLTFParser} parser
	 * @return {Promise<BufferGeometry>}
	 */
	function addMorphTargets( geometry, targets, parser ) {

		var hasMorphPosition = false;
		var hasMorphNormal = false;

		for ( var i = 0, il = targets.length; i < il; i ++ ) {

			var target = targets[ i ];

			if ( target.POSITION !== undefined ) hasMorphPosition = true;
			if ( target.NORMAL !== undefined ) hasMorphNormal = true;

			if ( hasMorphPosition && hasMorphNormal ) break;

		}

		if ( ! hasMorphPosition && ! hasMorphNormal ) return Promise.resolve( geometry );

		var pendingPositionAccessors = [];
		var pendingNormalAccessors = [];

		for ( var i = 0, il = targets.length; i < il; i ++ ) {

			var target = targets[ i ];

			if ( hasMorphPosition ) {

				var pendingAccessor = target.POSITION !== undefined
					? parser.getDependency( 'accessor', target.POSITION )
					: geometry.attributes.position;

				pendingPositionAccessors.push( pendingAccessor );

			}

			if ( hasMorphNormal ) {

				var pendingAccessor = target.NORMAL !== undefined
					? parser.getDependency( 'accessor', target.NORMAL )
					: geometry.attributes.normal;

				pendingNormalAccessors.push( pendingAccessor );

			}

		}

		return Promise.all( [
			Promise.all( pendingPositionAccessors ),
			Promise.all( pendingNormalAccessors )
		] ).then( function ( accessors ) {

			var morphPositions = accessors[ 0 ];
			var morphNormals = accessors[ 1 ];

			if ( hasMorphPosition ) geometry.morphAttributes.position = morphPositions;
			if ( hasMorphNormal ) geometry.morphAttributes.normal = morphNormals;
			geometry.morphTargetsRelative = true;

			return geometry;

		} );

	}

	/**
	 * @param {Mesh} mesh
	 * @param {GLTF.Mesh} meshDef
	 */
	function updateMorphTargets( mesh, meshDef ) {

		mesh.updateMorphTargets();

		if ( meshDef.weights !== undefined ) {

			for ( var i = 0, il = meshDef.weights.length; i < il; i ++ ) {

				mesh.morphTargetInfluences[ i ] = meshDef.weights[ i ];

			}

		}

		// .extras has user-defined data, so check that .extras.targetNames is an array.
		if ( meshDef.extras && Array.isArray( meshDef.extras.targetNames ) ) {

			var targetNames = meshDef.extras.targetNames;

			if ( mesh.morphTargetInfluences.length === targetNames.length ) {

				mesh.morphTargetDictionary = {};

				for ( var i = 0, il = targetNames.length; i < il; i ++ ) {

					mesh.morphTargetDictionary[ targetNames[ i ] ] = i;

				}

			} else {

				console.warn( 'THREE.GLTFLoader: Invalid extras.targetNames length. Ignoring names.' );

			}

		}

	}

	function createPrimitiveKey( primitiveDef ) {

		var dracoExtension = primitiveDef.extensions && primitiveDef.extensions[ EXTENSIONS.KHR_DRACO_MESH_COMPRESSION ];
		var geometryKey;

		if ( dracoExtension ) {

			geometryKey = 'draco:' + dracoExtension.bufferView
				+ ':' + dracoExtension.indices
				+ ':' + createAttributesKey( dracoExtension.attributes );

		} else {

			geometryKey = primitiveDef.indices + ':' + createAttributesKey( primitiveDef.attributes ) + ':' + primitiveDef.mode;

		}

		return geometryKey;

	}

	function createAttributesKey( attributes ) {

		var attributesKey = '';

		var keys = Object.keys( attributes ).sort();

		for ( var i = 0, il = keys.length; i < il; i ++ ) {

			attributesKey += keys[ i ] + ':' + attributes[ keys[ i ] ] + ';';

		}

		return attributesKey;

	}

	/* GLTF PARSER */

	function GLTFParser( json, extensions, options ) {

		this.json = json || {};
		this.extensions = extensions || {};
		this.options = options || {};

		// loader object cache
		this.cache = new GLTFRegistry();

		// BufferGeometry caching
		this.primitiveCache = {};

		this.textureLoader = new TextureLoader( this.options.manager );
		this.textureLoader.setCrossOrigin( this.options.crossOrigin );

		this.fileLoader = new FileLoader( this.options.manager );
		this.fileLoader.setResponseType( 'arraybuffer' );

		if ( this.options.crossOrigin === 'use-credentials' ) {

			this.fileLoader.setWithCredentials( true );

		}

	}

	GLTFParser.prototype.parse = function ( onLoad, onError ) {

		var parser = this;
		var json = this.json;
		var extensions = this.extensions;

		// Clear the loader cache
		this.cache.removeAll();

		// Mark the special nodes/meshes in json for efficient parse
		this.markDefs();

		Promise.all( [

			this.getDependencies( 'scene' ),
			this.getDependencies( 'animation' ),
			this.getDependencies( 'camera' ),

		] ).then( function ( dependencies ) {

			var result = {
				scene: dependencies[ 0 ][ json.scene || 0 ],
				scenes: dependencies[ 0 ],
				animations: dependencies[ 1 ],
				cameras: dependencies[ 2 ],
				asset: json.asset,
				parser: parser,
				userData: {}
			};

			addUnknownExtensionsToUserData( extensions, result, json );

			assignExtrasToUserData( result, json );

			onLoad( result );

		} ).catch( onError );

	};

	/**
	 * Marks the special nodes/meshes in json for efficient parse.
	 */
	GLTFParser.prototype.markDefs = function () {

		var nodeDefs = this.json.nodes || [];
		var skinDefs = this.json.skins || [];
		var meshDefs = this.json.meshes || [];

		var meshReferences = {};
		var meshUses = {};

		// Nothing in the node definition indicates whether it is a Bone or an
		// Object3D. Use the skins' joint references to mark bones.
		for ( var skinIndex = 0, skinLength = skinDefs.length; skinIndex < skinLength; skinIndex ++ ) {

			var joints = skinDefs[ skinIndex ].joints;

			for ( var i = 0, il = joints.length; i < il; i ++ ) {

				nodeDefs[ joints[ i ] ].isBone = true;

			}

		}

		// Meshes can (and should) be reused by multiple nodes in a glTF asset. To
		// avoid having more than one Mesh with the same name, count
		// references and rename instances below.
		//
		// Example: CesiumMilkTruck sample model reuses "Wheel" meshes.
		for ( var nodeIndex = 0, nodeLength = nodeDefs.length; nodeIndex < nodeLength; nodeIndex ++ ) {

			var nodeDef = nodeDefs[ nodeIndex ];

			if ( nodeDef.mesh !== undefined ) {

				if ( meshReferences[ nodeDef.mesh ] === undefined ) {

					meshReferences[ nodeDef.mesh ] = meshUses[ nodeDef.mesh ] = 0;

				}

				meshReferences[ nodeDef.mesh ] ++;

				// Nothing in the mesh definition indicates whether it is
				// a SkinnedMesh or Mesh. Use the node's mesh reference
				// to mark SkinnedMesh if node has skin.
				if ( nodeDef.skin !== undefined ) {

					meshDefs[ nodeDef.mesh ].isSkinnedMesh = true;

				}

			}

		}

		this.json.meshReferences = meshReferences;
		this.json.meshUses = meshUses;

	};

	/**
	 * Requests the specified dependency asynchronously, with caching.
	 * @param {string} type
	 * @param {number} index
	 * @return {Promise<Object3D|Material|THREE.Texture|AnimationClip|ArrayBuffer|Object>}
	 */
	GLTFParser.prototype.getDependency = function ( type, index ) {

		var cacheKey = type + ':' + index;
		var dependency = this.cache.get( cacheKey );

		if ( ! dependency ) {

			switch ( type ) {

				case 'scene':
					dependency = this.loadScene( index );
					break;

				case 'node':
					dependency = this.loadNode( index );
					break;

				case 'mesh':
					dependency = this.loadMesh( index );
					break;

				case 'accessor':
					dependency = this.loadAccessor( index );
					break;

				case 'bufferView':
					dependency = this.loadBufferView( index );
					break;

				case 'buffer':
					dependency = this.loadBuffer( index );
					break;

				case 'material':
					dependency = this.loadMaterial( index );
					break;

				case 'texture':
					dependency = this.loadTexture( index );
					break;

				case 'skin':
					dependency = this.loadSkin( index );
					break;

				case 'animation':
					dependency = this.loadAnimation( index );
					break;

				case 'camera':
					dependency = this.loadCamera( index );
					break;

				case 'light':
					dependency = this.extensions[ EXTENSIONS.KHR_LIGHTS_PUNCTUAL ].loadLight( index );
					break;

				default:
					throw new Error( 'Unknown type: ' + type );

			}

			this.cache.add( cacheKey, dependency );

		}

		return dependency;

	};

	/**
	 * Requests all dependencies of the specified type asynchronously, with caching.
	 * @param {string} type
	 * @return {Promise<Array<Object>>}
	 */
	GLTFParser.prototype.getDependencies = function ( type ) {

		var dependencies = this.cache.get( type );

		if ( ! dependencies ) {

			var parser = this;
			var defs = this.json[ type + ( type === 'mesh' ? 'es' : 's' ) ] || [];

			dependencies = Promise.all( defs.map( function ( def, index ) {

				return parser.getDependency( type, index );

			} ) );

			this.cache.add( type, dependencies );

		}

		return dependencies;

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#buffers-and-buffer-views
	 * @param {number} bufferIndex
	 * @return {Promise<ArrayBuffer>}
	 */
	GLTFParser.prototype.loadBuffer = function ( bufferIndex ) {

		var bufferDef = this.json.buffers[ bufferIndex ];
		var loader = this.fileLoader;

		if ( bufferDef.type && bufferDef.type !== 'arraybuffer' ) {

			throw new Error( 'THREE.GLTFLoader: ' + bufferDef.type + ' buffer type is not supported.' );

		}

		// If present, GLB container is required to be the first buffer.
		if ( bufferDef.uri === undefined && bufferIndex === 0 ) {

			return Promise.resolve( this.extensions[ EXTENSIONS.KHR_BINARY_GLTF ].body );

		}

		var options = this.options;

		return new Promise( function ( resolve, reject ) {

			loader.load( resolveURL( bufferDef.uri, options.path ), resolve, undefined, function () {

				reject( new Error( 'THREE.GLTFLoader: Failed to load buffer "' + bufferDef.uri + '".' ) );

			} );

		} );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#buffers-and-buffer-views
	 * @param {number} bufferViewIndex
	 * @return {Promise<ArrayBuffer>}
	 */
	GLTFParser.prototype.loadBufferView = function ( bufferViewIndex ) {

		var bufferViewDef = this.json.bufferViews[ bufferViewIndex ];

		return this.getDependency( 'buffer', bufferViewDef.buffer ).then( function ( buffer ) {

			var byteLength = bufferViewDef.byteLength || 0;
			var byteOffset = bufferViewDef.byteOffset || 0;
			return buffer.slice( byteOffset, byteOffset + byteLength );

		} );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#accessors
	 * @param {number} accessorIndex
	 * @return {Promise<BufferAttribute|InterleavedBufferAttribute>}
	 */
	GLTFParser.prototype.loadAccessor = function ( accessorIndex ) {

		var parser = this;
		var json = this.json;

		var accessorDef = this.json.accessors[ accessorIndex ];

		if ( accessorDef.bufferView === undefined && accessorDef.sparse === undefined ) {

			// Ignore empty accessors, which may be used to declare runtime
			// information about attributes coming from another source (e.g. Draco
			// compression extension).
			return Promise.resolve( null );

		}

		var pendingBufferViews = [];

		if ( accessorDef.bufferView !== undefined ) {

			pendingBufferViews.push( this.getDependency( 'bufferView', accessorDef.bufferView ) );

		} else {

			pendingBufferViews.push( null );

		}

		if ( accessorDef.sparse !== undefined ) {

			pendingBufferViews.push( this.getDependency( 'bufferView', accessorDef.sparse.indices.bufferView ) );
			pendingBufferViews.push( this.getDependency( 'bufferView', accessorDef.sparse.values.bufferView ) );

		}

		return Promise.all( pendingBufferViews ).then( function ( bufferViews ) {

			var bufferView = bufferViews[ 0 ];

			var itemSize = WEBGL_TYPE_SIZES[ accessorDef.type ];
			var TypedArray = WEBGL_COMPONENT_TYPES[ accessorDef.componentType ];

			// For VEC3: itemSize is 3, elementBytes is 4, itemBytes is 12.
			var elementBytes = TypedArray.BYTES_PER_ELEMENT;
			var itemBytes = elementBytes * itemSize;
			var byteOffset = accessorDef.byteOffset || 0;
			var byteStride = accessorDef.bufferView !== undefined ? json.bufferViews[ accessorDef.bufferView ].byteStride : undefined;
			var normalized = accessorDef.normalized === true;
			var array, bufferAttribute;

			// The buffer is not interleaved if the stride is the item size in bytes.
			if ( byteStride && byteStride !== itemBytes ) {

				// Each "slice" of the buffer, as defined by 'count' elements of 'byteStride' bytes, gets its own InterleavedBuffer
				// This makes sure that IBA.count reflects accessor.count properly
				var ibSlice = Math.floor( byteOffset / byteStride );
				var ibCacheKey = 'InterleavedBuffer:' + accessorDef.bufferView + ':' + accessorDef.componentType + ':' + ibSlice + ':' + accessorDef.count;
				var ib = parser.cache.get( ibCacheKey );

				if ( ! ib ) {

					array = new TypedArray( bufferView, ibSlice * byteStride, accessorDef.count * byteStride / elementBytes );

					// Integer parameters to IB/IBA are in array elements, not bytes.
					ib = new InterleavedBuffer( array, byteStride / elementBytes );

					parser.cache.add( ibCacheKey, ib );

				}

				bufferAttribute = new InterleavedBufferAttribute( ib, itemSize, ( byteOffset % byteStride ) / elementBytes, normalized );

			} else {

				if ( bufferView === null ) {

					array = new TypedArray( accessorDef.count * itemSize );

				} else {

					array = new TypedArray( bufferView, byteOffset, accessorDef.count * itemSize );

				}

				bufferAttribute = new BufferAttribute( array, itemSize, normalized );

			}

			// https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#sparse-accessors
			if ( accessorDef.sparse !== undefined ) {

				var itemSizeIndices = WEBGL_TYPE_SIZES.SCALAR;
				var TypedArrayIndices = WEBGL_COMPONENT_TYPES[ accessorDef.sparse.indices.componentType ];

				var byteOffsetIndices = accessorDef.sparse.indices.byteOffset || 0;
				var byteOffsetValues = accessorDef.sparse.values.byteOffset || 0;

				var sparseIndices = new TypedArrayIndices( bufferViews[ 1 ], byteOffsetIndices, accessorDef.sparse.count * itemSizeIndices );
				var sparseValues = new TypedArray( bufferViews[ 2 ], byteOffsetValues, accessorDef.sparse.count * itemSize );

				if ( bufferView !== null ) {

					// Avoid modifying the original ArrayBuffer, if the bufferView wasn't initialized with zeroes.
					bufferAttribute = new BufferAttribute( bufferAttribute.array.slice(), bufferAttribute.itemSize, bufferAttribute.normalized );

				}

				for ( var i = 0, il = sparseIndices.length; i < il; i ++ ) {

					var index = sparseIndices[ i ];

					bufferAttribute.setX( index, sparseValues[ i * itemSize ] );
					if ( itemSize >= 2 ) bufferAttribute.setY( index, sparseValues[ i * itemSize + 1 ] );
					if ( itemSize >= 3 ) bufferAttribute.setZ( index, sparseValues[ i * itemSize + 2 ] );
					if ( itemSize >= 4 ) bufferAttribute.setW( index, sparseValues[ i * itemSize + 3 ] );
					if ( itemSize >= 5 ) throw new Error( 'THREE.GLTFLoader: Unsupported itemSize in sparse BufferAttribute.' );

				}

			}

			return bufferAttribute;

		} );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#textures
	 * @param {number} textureIndex
	 * @return {Promise<THREE.Texture>}
	 */
	GLTFParser.prototype.loadTexture = function ( textureIndex ) {

		var parser = this;
		var json = this.json;
		var options = this.options;
		var textureLoader = this.textureLoader;

		var URL = self.URL || self.webkitURL;

		var textureDef = json.textures[ textureIndex ];

		var textureExtensions = textureDef.extensions || {};

		var source;

		if ( textureExtensions[ EXTENSIONS.MSFT_TEXTURE_DDS ] ) {

			source = json.images[ textureExtensions[ EXTENSIONS.MSFT_TEXTURE_DDS ].source ];

		} else {

			source = json.images[ textureDef.source ];

		}

		var sourceURI = source.uri;
		var isObjectURL = false;

		if ( source.bufferView !== undefined ) {

			// Load binary image data from bufferView, if provided.

			sourceURI = parser.getDependency( 'bufferView', source.bufferView ).then( function ( bufferView ) {

				isObjectURL = true;
				var blob = new Blob( [ bufferView ], { type: source.mimeType } );
				sourceURI = URL.createObjectURL( blob );
				return sourceURI;

			} );

		}

		return Promise.resolve( sourceURI ).then( function ( sourceURI ) {

			// Load Texture resource.

			var loader = options.manager.getHandler( sourceURI );

			if ( ! loader ) {

				loader = textureExtensions[ EXTENSIONS.MSFT_TEXTURE_DDS ]
					? parser.extensions[ EXTENSIONS.MSFT_TEXTURE_DDS ].ddsLoader
					: textureLoader;

			}

			return new Promise( function ( resolve, reject ) {

				loader.load( resolveURL( sourceURI, options.path ), resolve, undefined, reject );

			} );

		} ).then( function ( texture ) {

			// Clean up resources and configure Texture.

			if ( isObjectURL === true ) {

				URL.revokeObjectURL( sourceURI );

			}

			texture.flipY = false;

			if ( textureDef.name ) texture.name = textureDef.name;

			// Ignore unknown mime types, like DDS files.
			if ( source.mimeType in MIME_TYPE_FORMATS ) {

				texture.format = MIME_TYPE_FORMATS[ source.mimeType ];

			}

			var samplers = json.samplers || {};
			var sampler = samplers[ textureDef.sampler ] || {};

			texture.magFilter = WEBGL_FILTERS[ sampler.magFilter ] || LinearFilter;
			texture.minFilter = WEBGL_FILTERS[ sampler.minFilter ] || LinearMipmapLinearFilter;
			texture.wrapS = WEBGL_WRAPPINGS[ sampler.wrapS ] || RepeatWrapping;
			texture.wrapT = WEBGL_WRAPPINGS[ sampler.wrapT ] || RepeatWrapping;

			return texture;

		} );

	};

	/**
	 * Asynchronously assigns a texture to the given material parameters.
	 * @param {Object} materialParams
	 * @param {string} mapName
	 * @param {Object} mapDef
	 * @return {Promise}
	 */
	GLTFParser.prototype.assignTexture = function ( materialParams, mapName, mapDef ) {

		var parser = this;

		return this.getDependency( 'texture', mapDef.index ).then( function ( texture ) {

			if ( ! texture.isCompressedTexture ) {

				switch ( mapName ) {

					case 'aoMap':
					case 'emissiveMap':
					case 'metalnessMap':
					case 'normalMap':
					case 'roughnessMap':
						texture.format = RGBFormat;
						break;

				}

			}

			// Materials sample aoMap from UV set 1 and other maps from UV set 0 - this can't be configured
			// However, we will copy UV set 0 to UV set 1 on demand for aoMap
			if ( mapDef.texCoord !== undefined && mapDef.texCoord != 0 && ! ( mapName === 'aoMap' && mapDef.texCoord == 1 ) ) {

				console.warn( 'THREE.GLTFLoader: Custom UV set ' + mapDef.texCoord + ' for texture ' + mapName + ' not yet supported.' );

			}

			if ( parser.extensions[ EXTENSIONS.KHR_TEXTURE_TRANSFORM ] ) {

				var transform = mapDef.extensions !== undefined ? mapDef.extensions[ EXTENSIONS.KHR_TEXTURE_TRANSFORM ] : undefined;

				if ( transform ) {

					texture = parser.extensions[ EXTENSIONS.KHR_TEXTURE_TRANSFORM ].extendTexture( texture, transform );

				}

			}

			materialParams[ mapName ] = texture;

		} );

	};

	/**
	 * Assigns final material to a Mesh, Line, or Points instance. The instance
	 * already has a material (generated from the glTF material options alone)
	 * but reuse of the same glTF material may require multiple threejs materials
	 * to accomodate different primitive types, defines, etc. New materials will
	 * be created if necessary, and reused from a cache.
	 * @param  {Object3D} mesh Mesh, Line, or Points instance.
	 */
	GLTFParser.prototype.assignFinalMaterial = function ( mesh ) {

		var geometry = mesh.geometry;
		var material = mesh.material;

		var useVertexTangents = geometry.attributes.tangent !== undefined;
		var useVertexColors = geometry.attributes.color !== undefined;
		var useFlatShading = geometry.attributes.normal === undefined;
		var useSkinning = mesh.isSkinnedMesh === true;
		var useMorphTargets = Object.keys( geometry.morphAttributes ).length > 0;
		var useMorphNormals = useMorphTargets && geometry.morphAttributes.normal !== undefined;

		if ( mesh.isPoints ) {

			var cacheKey = 'PointsMaterial:' + material.uuid;

			var pointsMaterial = this.cache.get( cacheKey );

			if ( ! pointsMaterial ) {

				pointsMaterial = new PointsMaterial();
				Material.prototype.copy.call( pointsMaterial, material );
				pointsMaterial.color.copy( material.color );
				pointsMaterial.map = material.map;
				pointsMaterial.sizeAttenuation = false; // glTF spec says points should be 1px

				this.cache.add( cacheKey, pointsMaterial );

			}

			material = pointsMaterial;

		} else if ( mesh.isLine ) {

			var cacheKey = 'LineBasicMaterial:' + material.uuid;

			var lineMaterial = this.cache.get( cacheKey );

			if ( ! lineMaterial ) {

				lineMaterial = new LineBasicMaterial();
				Material.prototype.copy.call( lineMaterial, material );
				lineMaterial.color.copy( material.color );

				this.cache.add( cacheKey, lineMaterial );

			}

			material = lineMaterial;

		}

		// Clone the material if it will be modified
		if ( useVertexTangents || useVertexColors || useFlatShading || useSkinning || useMorphTargets ) {

			var cacheKey = 'ClonedMaterial:' + material.uuid + ':';

			if ( material.isGLTFSpecularGlossinessMaterial ) cacheKey += 'specular-glossiness:';
			if ( useSkinning ) cacheKey += 'skinning:';
			if ( useVertexTangents ) cacheKey += 'vertex-tangents:';
			if ( useVertexColors ) cacheKey += 'vertex-colors:';
			if ( useFlatShading ) cacheKey += 'flat-shading:';
			if ( useMorphTargets ) cacheKey += 'morph-targets:';
			if ( useMorphNormals ) cacheKey += 'morph-normals:';

			var cachedMaterial = this.cache.get( cacheKey );

			if ( ! cachedMaterial ) {

				cachedMaterial = material.clone();

				if ( useSkinning ) cachedMaterial.skinning = true;
				if ( useVertexTangents ) cachedMaterial.vertexTangents = true;
				if ( useVertexColors ) cachedMaterial.vertexColors = true;
				if ( useFlatShading ) cachedMaterial.flatShading = true;
				if ( useMorphTargets ) cachedMaterial.morphTargets = true;
				if ( useMorphNormals ) cachedMaterial.morphNormals = true;

				this.cache.add( cacheKey, cachedMaterial );

			}

			material = cachedMaterial;

		}

		// workarounds for mesh and geometry

		if ( material.aoMap && geometry.attributes.uv2 === undefined && geometry.attributes.uv !== undefined ) {

			geometry.setAttribute( 'uv2', new BufferAttribute( geometry.attributes.uv.array, 2 ) );

		}

		// https://github.com/mrdoob/three.js/issues/11438#issuecomment-507003995
		if ( material.normalScale && ! useVertexTangents ) {

			material.normalScale.y = - material.normalScale.y;

		}

		if ( material.clearcoatNormalScale && ! useVertexTangents ) {

			material.clearcoatNormalScale.y = - material.clearcoatNormalScale.y;

		}

		mesh.material = material;

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#materials
	 * @param {number} materialIndex
	 * @return {Promise<Material>}
	 */
	GLTFParser.prototype.loadMaterial = function ( materialIndex ) {

		var parser = this;
		var json = this.json;
		var extensions = this.extensions;
		var materialDef = json.materials[ materialIndex ];

		var materialType;
		var materialParams = {};
		var materialExtensions = materialDef.extensions || {};

		var pending = [];

		if ( materialExtensions[ EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS ] ) {

			var sgExtension = extensions[ EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS ];
			materialType = sgExtension.getMaterialType();
			pending.push( sgExtension.extendParams( materialParams, materialDef, parser ) );

		} else if ( materialExtensions[ EXTENSIONS.KHR_MATERIALS_UNLIT ] ) {

			var kmuExtension = extensions[ EXTENSIONS.KHR_MATERIALS_UNLIT ];
			materialType = kmuExtension.getMaterialType();
			pending.push( kmuExtension.extendParams( materialParams, materialDef, parser ) );

		} else {

			// Specification:
			// https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#metallic-roughness-material

			materialType = MeshStandardMaterial;

			var metallicRoughness = materialDef.pbrMetallicRoughness || {};

			materialParams.color = new Color( 1.0, 1.0, 1.0 );
			materialParams.opacity = 1.0;

			if ( Array.isArray( metallicRoughness.baseColorFactor ) ) {

				var array = metallicRoughness.baseColorFactor;

				materialParams.color.fromArray( array );
				materialParams.opacity = array[ 3 ];

			}

			if ( metallicRoughness.baseColorTexture !== undefined ) {

				pending.push( parser.assignTexture( materialParams, 'map', metallicRoughness.baseColorTexture ) );

			}

			materialParams.metalness = metallicRoughness.metallicFactor !== undefined ? metallicRoughness.metallicFactor : 1.0;
			materialParams.roughness = metallicRoughness.roughnessFactor !== undefined ? metallicRoughness.roughnessFactor : 1.0;

			if ( metallicRoughness.metallicRoughnessTexture !== undefined ) {

				pending.push( parser.assignTexture( materialParams, 'metalnessMap', metallicRoughness.metallicRoughnessTexture ) );
				pending.push( parser.assignTexture( materialParams, 'roughnessMap', metallicRoughness.metallicRoughnessTexture ) );

			}

		}

		if ( materialDef.doubleSided === true ) {

			materialParams.side = DoubleSide;

		}

		var alphaMode = materialDef.alphaMode || ALPHA_MODES.OPAQUE;

		if ( alphaMode === ALPHA_MODES.BLEND ) {

			materialParams.transparent = true;

			// See: https://github.com/mrdoob/three.js/issues/17706
			materialParams.depthWrite = false;

		} else {

			materialParams.transparent = false;

			if ( alphaMode === ALPHA_MODES.MASK ) {

				materialParams.alphaTest = materialDef.alphaCutoff !== undefined ? materialDef.alphaCutoff : 0.5;

			}

		}

		if ( materialDef.normalTexture !== undefined && materialType !== MeshBasicMaterial ) {

			pending.push( parser.assignTexture( materialParams, 'normalMap', materialDef.normalTexture ) );

			materialParams.normalScale = new Vector2( 1, 1 );

			if ( materialDef.normalTexture.scale !== undefined ) {

				materialParams.normalScale.set( materialDef.normalTexture.scale, materialDef.normalTexture.scale );

			}

		}

		if ( materialDef.occlusionTexture !== undefined && materialType !== MeshBasicMaterial ) {

			pending.push( parser.assignTexture( materialParams, 'aoMap', materialDef.occlusionTexture ) );

			if ( materialDef.occlusionTexture.strength !== undefined ) {

				materialParams.aoMapIntensity = materialDef.occlusionTexture.strength;

			}

		}

		if ( materialDef.emissiveFactor !== undefined && materialType !== MeshBasicMaterial ) {

			materialParams.emissive = new Color().fromArray( materialDef.emissiveFactor );

		}

		if ( materialDef.emissiveTexture !== undefined && materialType !== MeshBasicMaterial ) {

			pending.push( parser.assignTexture( materialParams, 'emissiveMap', materialDef.emissiveTexture ) );

		}

		if ( materialExtensions[ EXTENSIONS.KHR_MATERIALS_CLEARCOAT ] ) {

			var clearcoatExtension = extensions[ EXTENSIONS.KHR_MATERIALS_CLEARCOAT ];
			materialType = clearcoatExtension.getMaterialType();
			pending.push( clearcoatExtension.extendParams( materialParams, { extensions: materialExtensions }, parser ) );

		}

		return Promise.all( pending ).then( function () {

			var material;

			if ( materialType === GLTFMeshStandardSGMaterial ) {

				material = extensions[ EXTENSIONS.KHR_MATERIALS_PBR_SPECULAR_GLOSSINESS ].createMaterial( materialParams );

			} else {

				material = new materialType( materialParams );

			}

			if ( materialDef.name ) material.name = materialDef.name;

			// baseColorTexture, emissiveTexture, and specularGlossinessTexture use sRGB encoding.
			if ( material.map ) material.map.encoding = sRGBEncoding;
			if ( material.emissiveMap ) material.emissiveMap.encoding = sRGBEncoding;

			assignExtrasToUserData( material, materialDef );

			if ( materialDef.extensions ) addUnknownExtensionsToUserData( extensions, material, materialDef );

			return material;

		} );

	};

	/**
	 * @param {BufferGeometry} geometry
	 * @param {GLTF.Primitive} primitiveDef
	 * @param {GLTFParser} parser
	 */
	function computeBounds( geometry, primitiveDef, parser ) {

		var attributes = primitiveDef.attributes;

		var box = new Box3();

		if ( attributes.POSITION !== undefined ) {

			var accessor = parser.json.accessors[ attributes.POSITION ];

			var min = accessor.min;
			var max = accessor.max;

			// glTF requires 'min' and 'max', but VRM (which extends glTF) currently ignores that requirement.

			if ( min !== undefined && max !== undefined ) {

				box.set(
					new Vector3( min[ 0 ], min[ 1 ], min[ 2 ] ),
					new Vector3( max[ 0 ], max[ 1 ], max[ 2 ] ) );

			} else {

				console.warn( 'THREE.GLTFLoader: Missing min/max properties for accessor POSITION.' );

				return;

			}

		} else {

			return;

		}

		var targets = primitiveDef.targets;

		if ( targets !== undefined ) {

			var maxDisplacement = new Vector3();
			var vector = new Vector3();

			for ( var i = 0, il = targets.length; i < il; i ++ ) {

				var target = targets[ i ];

				if ( target.POSITION !== undefined ) {

					var accessor = parser.json.accessors[ target.POSITION ];
					var min = accessor.min;
					var max = accessor.max;

					// glTF requires 'min' and 'max', but VRM (which extends glTF) currently ignores that requirement.

					if ( min !== undefined && max !== undefined ) {

						// we need to get max of absolute components because target weight is [-1,1]
						vector.setX( Math.max( Math.abs( min[ 0 ] ), Math.abs( max[ 0 ] ) ) );
						vector.setY( Math.max( Math.abs( min[ 1 ] ), Math.abs( max[ 1 ] ) ) );
						vector.setZ( Math.max( Math.abs( min[ 2 ] ), Math.abs( max[ 2 ] ) ) );

						// Note: this assumes that the sum of all weights is at most 1. This isn't quite correct - it's more conservative
						// to assume that each target can have a max weight of 1. However, for some use cases - notably, when morph targets
						// are used to implement key-frame animations and as such only two are active at a time - this results in very large
						// boxes. So for now we make a box that's sometimes a touch too small but is hopefully mostly of reasonable size.
						maxDisplacement.max( vector );

					} else {

						console.warn( 'THREE.GLTFLoader: Missing min/max properties for accessor POSITION.' );

					}

				}

			}

			// As per comment above this box isn't conservative, but has a reasonable size for a very large number of morph targets.
			box.expandByVector( maxDisplacement );

		}

		geometry.boundingBox = box;

		var sphere = new Sphere();

		box.getCenter( sphere.center );
		sphere.radius = box.min.distanceTo( box.max ) / 2;

		geometry.boundingSphere = sphere;

	}

	/**
	 * @param {BufferGeometry} geometry
	 * @param {GLTF.Primitive} primitiveDef
	 * @param {GLTFParser} parser
	 * @return {Promise<BufferGeometry>}
	 */
	function addPrimitiveAttributes( geometry, primitiveDef, parser ) {

		var attributes = primitiveDef.attributes;

		var pending = [];

		function assignAttributeAccessor( accessorIndex, attributeName ) {

			return parser.getDependency( 'accessor', accessorIndex )
				.then( function ( accessor ) {

					geometry.setAttribute( attributeName, accessor );

				} );

		}

		for ( var gltfAttributeName in attributes ) {

			var threeAttributeName = ATTRIBUTES[ gltfAttributeName ] || gltfAttributeName.toLowerCase();

			// Skip attributes already provided by e.g. Draco extension.
			if ( threeAttributeName in geometry.attributes ) continue;

			pending.push( assignAttributeAccessor( attributes[ gltfAttributeName ], threeAttributeName ) );

		}

		if ( primitiveDef.indices !== undefined && ! geometry.index ) {

			var accessor = parser.getDependency( 'accessor', primitiveDef.indices ).then( function ( accessor ) {

				geometry.setIndex( accessor );

			} );

			pending.push( accessor );

		}

		assignExtrasToUserData( geometry, primitiveDef );

		computeBounds( geometry, primitiveDef, parser );

		return Promise.all( pending ).then( function () {

			return primitiveDef.targets !== undefined
				? addMorphTargets( geometry, primitiveDef.targets, parser )
				: geometry;

		} );

	}

	/**
	 * @param {BufferGeometry} geometry
	 * @param {Number} drawMode
	 * @return {BufferGeometry}
	 */
	function toTrianglesDrawMode( geometry, drawMode ) {

		var index = geometry.getIndex();

		// generate index if not present

		if ( index === null ) {

			var indices = [];

			var position = geometry.getAttribute( 'position' );

			if ( position !== undefined ) {

				for ( var i = 0; i < position.count; i ++ ) {

					indices.push( i );

				}

				geometry.setIndex( indices );
				index = geometry.getIndex();

			} else {

				console.error( 'THREE.GLTFLoader.toTrianglesDrawMode(): Undefined position attribute. Processing not possible.' );
				return geometry;

			}

		}

		//

		var numberOfTriangles = index.count - 2;
		var newIndices = [];

		if ( drawMode === TriangleFanDrawMode ) {

			// gl.TRIANGLE_FAN

			for ( var i = 1; i <= numberOfTriangles; i ++ ) {

				newIndices.push( index.getX( 0 ) );
				newIndices.push( index.getX( i ) );
				newIndices.push( index.getX( i + 1 ) );

			}

		} else {

			// gl.TRIANGLE_STRIP

			for ( var i = 0; i < numberOfTriangles; i ++ ) {

				if ( i % 2 === 0 ) {

					newIndices.push( index.getX( i ) );
					newIndices.push( index.getX( i + 1 ) );
					newIndices.push( index.getX( i + 2 ) );


				} else {

					newIndices.push( index.getX( i + 2 ) );
					newIndices.push( index.getX( i + 1 ) );
					newIndices.push( index.getX( i ) );

				}

			}

		}

		if ( ( newIndices.length / 3 ) !== numberOfTriangles ) {

			console.error( 'THREE.GLTFLoader.toTrianglesDrawMode(): Unable to generate correct amount of triangles.' );

		}

		// build final geometry

		var newGeometry = geometry.clone();
		newGeometry.setIndex( newIndices );

		return newGeometry;

	}

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#geometry
	 *
	 * Creates BufferGeometries from primitives.
	 *
	 * @param {Array<GLTF.Primitive>} primitives
	 * @return {Promise<Array<BufferGeometry>>}
	 */
	GLTFParser.prototype.loadGeometries = function ( primitives ) {

		var parser = this;
		var extensions = this.extensions;
		var cache = this.primitiveCache;

		function createDracoPrimitive( primitive ) {

			return extensions[ EXTENSIONS.KHR_DRACO_MESH_COMPRESSION ]
				.decodePrimitive( primitive, parser )
				.then( function ( geometry ) {

					return addPrimitiveAttributes( geometry, primitive, parser );

				} );

		}

		var pending = [];

		for ( var i = 0, il = primitives.length; i < il; i ++ ) {

			var primitive = primitives[ i ];
			var cacheKey = createPrimitiveKey( primitive );

			// See if we've already created this geometry
			var cached = cache[ cacheKey ];

			if ( cached ) {

				// Use the cached geometry if it exists
				pending.push( cached.promise );

			} else {

				var geometryPromise;

				if ( primitive.extensions && primitive.extensions[ EXTENSIONS.KHR_DRACO_MESH_COMPRESSION ] ) {

					// Use DRACO geometry if available
					geometryPromise = createDracoPrimitive( primitive );

				} else {

					// Otherwise create a new geometry
					geometryPromise = addPrimitiveAttributes( new BufferGeometry(), primitive, parser );

				}

				// Cache this geometry
				cache[ cacheKey ] = { primitive: primitive, promise: geometryPromise };

				pending.push( geometryPromise );

			}

		}

		return Promise.all( pending );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#meshes
	 * @param {number} meshIndex
	 * @return {Promise<Group|Mesh|SkinnedMesh>}
	 */
	GLTFParser.prototype.loadMesh = function ( meshIndex ) {

		var parser = this;
		var json = this.json;

		var meshDef = json.meshes[ meshIndex ];
		var primitives = meshDef.primitives;

		var pending = [];

		for ( var i = 0, il = primitives.length; i < il; i ++ ) {

			var material = primitives[ i ].material === undefined
				? createDefaultMaterial( this.cache )
				: this.getDependency( 'material', primitives[ i ].material );

			pending.push( material );

		}

		pending.push( parser.loadGeometries( primitives ) );

		return Promise.all( pending ).then( function ( results ) {

			var materials = results.slice( 0, results.length - 1 );
			var geometries = results[ results.length - 1 ];

			var meshes = [];

			for ( var i = 0, il = geometries.length; i < il; i ++ ) {

				var geometry = geometries[ i ];
				var primitive = primitives[ i ];

				// 1. create Mesh

				var mesh;

				var material = materials[ i ];

				if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLES ||
					primitive.mode === WEBGL_CONSTANTS.TRIANGLE_STRIP ||
					primitive.mode === WEBGL_CONSTANTS.TRIANGLE_FAN ||
					primitive.mode === undefined ) {

					// .isSkinnedMesh isn't in glTF spec. See .markDefs()
					mesh = meshDef.isSkinnedMesh === true
						? new SkinnedMesh( geometry, material )
						: new Mesh( geometry, material );

					if ( mesh.isSkinnedMesh === true && ! mesh.geometry.attributes.skinWeight.normalized ) {

						// we normalize floating point skin weight array to fix malformed assets (see #15319)
						// it's important to skip this for non-float32 data since normalizeSkinWeights assumes non-normalized inputs
						mesh.normalizeSkinWeights();

					}

					if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLE_STRIP ) {

						mesh.geometry = toTrianglesDrawMode( mesh.geometry, TriangleStripDrawMode );

					} else if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLE_FAN ) {

						mesh.geometry = toTrianglesDrawMode( mesh.geometry, TriangleFanDrawMode );

					}

				} else if ( primitive.mode === WEBGL_CONSTANTS.LINES ) {

					mesh = new LineSegments( geometry, material );

				} else if ( primitive.mode === WEBGL_CONSTANTS.LINE_STRIP ) {

					mesh = new Line( geometry, material );

				} else if ( primitive.mode === WEBGL_CONSTANTS.LINE_LOOP ) {

					mesh = new LineLoop( geometry, material );

				} else if ( primitive.mode === WEBGL_CONSTANTS.POINTS ) {

					mesh = new Points( geometry, material );

				} else {

					throw new Error( 'THREE.GLTFLoader: Primitive mode unsupported: ' + primitive.mode );

				}

				if ( Object.keys( mesh.geometry.morphAttributes ).length > 0 ) {

					updateMorphTargets( mesh, meshDef );

				}

				mesh.name = meshDef.name || ( 'mesh_' + meshIndex );

				if ( geometries.length > 1 ) mesh.name += '_' + i;

				assignExtrasToUserData( mesh, meshDef );

				parser.assignFinalMaterial( mesh );

				meshes.push( mesh );

			}

			if ( meshes.length === 1 ) {

				return meshes[ 0 ];

			}

			var group = new Group();

			for ( var i = 0, il = meshes.length; i < il; i ++ ) {

				group.add( meshes[ i ] );

			}

			return group;

		} );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#cameras
	 * @param {number} cameraIndex
	 * @return {Promise<THREE.Camera>}
	 */
	GLTFParser.prototype.loadCamera = function ( cameraIndex ) {

		var camera;
		var cameraDef = this.json.cameras[ cameraIndex ];
		var params = cameraDef[ cameraDef.type ];

		if ( ! params ) {

			console.warn( 'THREE.GLTFLoader: Missing camera parameters.' );
			return;

		}

		if ( cameraDef.type === 'perspective' ) {

			camera = new PerspectiveCamera( MathUtils.radToDeg( params.yfov ), params.aspectRatio || 1, params.znear || 1, params.zfar || 2e6 );

		} else if ( cameraDef.type === 'orthographic' ) {

			camera = new OrthographicCamera( params.xmag / - 2, params.xmag / 2, params.ymag / 2, params.ymag / - 2, params.znear, params.zfar );

		}

		if ( cameraDef.name ) camera.name = cameraDef.name;

		assignExtrasToUserData( camera, cameraDef );

		return Promise.resolve( camera );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#skins
	 * @param {number} skinIndex
	 * @return {Promise<Object>}
	 */
	GLTFParser.prototype.loadSkin = function ( skinIndex ) {

		var skinDef = this.json.skins[ skinIndex ];

		var skinEntry = { joints: skinDef.joints };

		if ( skinDef.inverseBindMatrices === undefined ) {

			return Promise.resolve( skinEntry );

		}

		return this.getDependency( 'accessor', skinDef.inverseBindMatrices ).then( function ( accessor ) {

			skinEntry.inverseBindMatrices = accessor;

			return skinEntry;

		} );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#animations
	 * @param {number} animationIndex
	 * @return {Promise<AnimationClip>}
	 */
	GLTFParser.prototype.loadAnimation = function ( animationIndex ) {

		var json = this.json;

		var animationDef = json.animations[ animationIndex ];

		var pendingNodes = [];
		var pendingInputAccessors = [];
		var pendingOutputAccessors = [];
		var pendingSamplers = [];
		var pendingTargets = [];

		for ( var i = 0, il = animationDef.channels.length; i < il; i ++ ) {

			var channel = animationDef.channels[ i ];
			var sampler = animationDef.samplers[ channel.sampler ];
			var target = channel.target;
			var name = target.node !== undefined ? target.node : target.id; // NOTE: target.id is deprecated.
			var input = animationDef.parameters !== undefined ? animationDef.parameters[ sampler.input ] : sampler.input;
			var output = animationDef.parameters !== undefined ? animationDef.parameters[ sampler.output ] : sampler.output;

			pendingNodes.push( this.getDependency( 'node', name ) );
			pendingInputAccessors.push( this.getDependency( 'accessor', input ) );
			pendingOutputAccessors.push( this.getDependency( 'accessor', output ) );
			pendingSamplers.push( sampler );
			pendingTargets.push( target );

		}

		return Promise.all( [

			Promise.all( pendingNodes ),
			Promise.all( pendingInputAccessors ),
			Promise.all( pendingOutputAccessors ),
			Promise.all( pendingSamplers ),
			Promise.all( pendingTargets )

		] ).then( function ( dependencies ) {

			var nodes = dependencies[ 0 ];
			var inputAccessors = dependencies[ 1 ];
			var outputAccessors = dependencies[ 2 ];
			var samplers = dependencies[ 3 ];
			var targets = dependencies[ 4 ];

			var tracks = [];

			for ( var i = 0, il = nodes.length; i < il; i ++ ) {

				var node = nodes[ i ];
				var inputAccessor = inputAccessors[ i ];
				var outputAccessor = outputAccessors[ i ];
				var sampler = samplers[ i ];
				var target = targets[ i ];

				if ( node === undefined ) continue;

				node.updateMatrix();
				node.matrixAutoUpdate = true;

				var TypedKeyframeTrack;

				switch ( PATH_PROPERTIES[ target.path ] ) {

					case PATH_PROPERTIES.weights:

						TypedKeyframeTrack = NumberKeyframeTrack;
						break;

					case PATH_PROPERTIES.rotation:

						TypedKeyframeTrack = QuaternionKeyframeTrack;
						break;

					case PATH_PROPERTIES.position:
					case PATH_PROPERTIES.scale:
					default:

						TypedKeyframeTrack = VectorKeyframeTrack;
						break;

				}

				var targetName = node.name ? node.name : node.uuid;

				var interpolation = sampler.interpolation !== undefined ? INTERPOLATION[ sampler.interpolation ] : InterpolateLinear;

				var targetNames = [];

				if ( PATH_PROPERTIES[ target.path ] === PATH_PROPERTIES.weights ) {

					// Node may be a Group (glTF mesh with several primitives) or a Mesh.
					node.traverse( function ( object ) {

						if ( object.isMesh === true && object.morphTargetInfluences ) {

							targetNames.push( object.name ? object.name : object.uuid );

						}

					} );

				} else {

					targetNames.push( targetName );

				}

				var outputArray = outputAccessor.array;

				if ( outputAccessor.normalized ) {

					var scale;

					if ( outputArray.constructor === Int8Array ) {

						scale = 1 / 127;

					} else if ( outputArray.constructor === Uint8Array ) {

						scale = 1 / 255;

					} else if ( outputArray.constructor == Int16Array ) {

						scale = 1 / 32767;

					} else if ( outputArray.constructor === Uint16Array ) {

						scale = 1 / 65535;

					} else {

						throw new Error( 'THREE.GLTFLoader: Unsupported output accessor component type.' );

					}

					var scaled = new Float32Array( outputArray.length );

					for ( var j = 0, jl = outputArray.length; j < jl; j ++ ) {

						scaled[ j ] = outputArray[ j ] * scale;

					}

					outputArray = scaled;

				}

				for ( var j = 0, jl = targetNames.length; j < jl; j ++ ) {

					var track = new TypedKeyframeTrack(
						targetNames[ j ] + '.' + PATH_PROPERTIES[ target.path ],
						inputAccessor.array,
						outputArray,
						interpolation
					);

					// Override interpolation with custom factory method.
					if ( sampler.interpolation === 'CUBICSPLINE' ) {

						track.createInterpolant = function InterpolantFactoryMethodGLTFCubicSpline( result ) {

							// A CUBICSPLINE keyframe in glTF has three output values for each input value,
							// representing inTangent, splineVertex, and outTangent. As a result, track.getValueSize()
							// must be divided by three to get the interpolant's sampleSize argument.

							return new GLTFCubicSplineInterpolant( this.times, this.values, this.getValueSize() / 3, result );

						};

						// Mark as CUBICSPLINE. `track.getInterpolation()` doesn't support custom interpolants.
						track.createInterpolant.isInterpolantFactoryMethodGLTFCubicSpline = true;

					}

					tracks.push( track );

				}

			}

			var name = animationDef.name ? animationDef.name : 'animation_' + animationIndex;

			return new AnimationClip( name, undefined, tracks );

		} );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#nodes-and-hierarchy
	 * @param {number} nodeIndex
	 * @return {Promise<Object3D>}
	 */
	GLTFParser.prototype.loadNode = function ( nodeIndex ) {

		var json = this.json;
		var extensions = this.extensions;
		var parser = this;

		var meshReferences = json.meshReferences;
		var meshUses = json.meshUses;

		var nodeDef = json.nodes[ nodeIndex ];

		return ( function () {

			var pending = [];

			if ( nodeDef.mesh !== undefined ) {

				pending.push( parser.getDependency( 'mesh', nodeDef.mesh ).then( function ( mesh ) {

					var node;

					if ( meshReferences[ nodeDef.mesh ] > 1 ) {

						var instanceNum = meshUses[ nodeDef.mesh ] ++;

						node = mesh.clone();
						node.name += '_instance_' + instanceNum;

					} else {

						node = mesh;

					}

					// if weights are provided on the node, override weights on the mesh.
					if ( nodeDef.weights !== undefined ) {

						node.traverse( function ( o ) {

							if ( ! o.isMesh ) return;

							for ( var i = 0, il = nodeDef.weights.length; i < il; i ++ ) {

								o.morphTargetInfluences[ i ] = nodeDef.weights[ i ];

							}

						} );

					}

					return node;

				} ) );

			}

			if ( nodeDef.camera !== undefined ) {

				pending.push( parser.getDependency( 'camera', nodeDef.camera ) );

			}

			if ( nodeDef.extensions
				&& nodeDef.extensions[ EXTENSIONS.KHR_LIGHTS_PUNCTUAL ]
				&& nodeDef.extensions[ EXTENSIONS.KHR_LIGHTS_PUNCTUAL ].light !== undefined ) {

				pending.push( parser.getDependency( 'light', nodeDef.extensions[ EXTENSIONS.KHR_LIGHTS_PUNCTUAL ].light ) );

			}

			return Promise.all( pending );

		}() ).then( function ( objects ) {

			var node;

			// .isBone isn't in glTF spec. See .markDefs
			if ( nodeDef.isBone === true ) {

				node = new Bone();

			} else if ( objects.length > 1 ) {

				node = new Group();

			} else if ( objects.length === 1 ) {

				node = objects[ 0 ];

			} else {

				node = new Object3D();

			}

			if ( node !== objects[ 0 ] ) {

				for ( var i = 0, il = objects.length; i < il; i ++ ) {

					node.add( objects[ i ] );

				}

			}

			if ( nodeDef.name ) {

				node.userData.name = nodeDef.name;
				node.name = PropertyBinding.sanitizeNodeName( nodeDef.name );

			}

			assignExtrasToUserData( node, nodeDef );

			if ( nodeDef.extensions ) addUnknownExtensionsToUserData( extensions, node, nodeDef );

			if ( nodeDef.matrix !== undefined ) {

				var matrix = new Matrix4();
				matrix.fromArray( nodeDef.matrix );
				node.applyMatrix4( matrix );

			} else {

				if ( nodeDef.translation !== undefined ) {

					node.position.fromArray( nodeDef.translation );

				}

				if ( nodeDef.rotation !== undefined ) {

					node.quaternion.fromArray( nodeDef.rotation );

				}

				if ( nodeDef.scale !== undefined ) {

					node.scale.fromArray( nodeDef.scale );

				}

			}

			return node;

		} );

	};

	/**
	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#scenes
	 * @param {number} sceneIndex
	 * @return {Promise<Group>}
	 */
	GLTFParser.prototype.loadScene = function () {

		// scene node hierachy builder

		function buildNodeHierachy( nodeId, parentObject, json, parser ) {

			var nodeDef = json.nodes[ nodeId ];

			return parser.getDependency( 'node', nodeId ).then( function ( node ) {

				if ( nodeDef.skin === undefined ) return node;

				// build skeleton here as well

				var skinEntry;

				return parser.getDependency( 'skin', nodeDef.skin ).then( function ( skin ) {

					skinEntry = skin;

					var pendingJoints = [];

					for ( var i = 0, il = skinEntry.joints.length; i < il; i ++ ) {

						pendingJoints.push( parser.getDependency( 'node', skinEntry.joints[ i ] ) );

					}

					return Promise.all( pendingJoints );

				} ).then( function ( jointNodes ) {

					node.traverse( function ( mesh ) {

						if ( ! mesh.isMesh ) return;

						var bones = [];
						var boneInverses = [];

						for ( var j = 0, jl = jointNodes.length; j < jl; j ++ ) {

							var jointNode = jointNodes[ j ];

							if ( jointNode ) {

								bones.push( jointNode );

								var mat = new Matrix4();

								if ( skinEntry.inverseBindMatrices !== undefined ) {

									mat.fromArray( skinEntry.inverseBindMatrices.array, j * 16 );

								}

								boneInverses.push( mat );

							} else {

								console.warn( 'THREE.GLTFLoader: Joint "%s" could not be found.', skinEntry.joints[ j ] );

							}

						}

						mesh.bind( new Skeleton( bones, boneInverses ), mesh.matrixWorld );

					} );

					return node;

				} );

			} ).then( function ( node ) {

				// build node hierachy

				parentObject.add( node );

				var pending = [];

				if ( nodeDef.children ) {

					var children = nodeDef.children;

					for ( var i = 0, il = children.length; i < il; i ++ ) {

						var child = children[ i ];
						pending.push( buildNodeHierachy( child, node, json, parser ) );

					}

				}

				return Promise.all( pending );

			} );

		}

		return function loadScene( sceneIndex ) {

			var json = this.json;
			var extensions = this.extensions;
			var sceneDef = this.json.scenes[ sceneIndex ];
			var parser = this;

			// Loader returns Group, not Scene.
			// See: https://github.com/mrdoob/three.js/issues/18342#issuecomment-578981172
			var scene = new Group();
			if ( sceneDef.name ) scene.name = sceneDef.name;

			assignExtrasToUserData( scene, sceneDef );

			if ( sceneDef.extensions ) addUnknownExtensionsToUserData( extensions, scene, sceneDef );

			var nodeIds = sceneDef.nodes || [];

			var pending = [];

			for ( var i = 0, il = nodeIds.length; i < il; i ++ ) {

				pending.push( buildNodeHierachy( nodeIds[ i ], scene, json, parser ) );

			}

			return Promise.all( pending ).then( function () {

				return scene;

			} );

		};

	}();

	return GLTFLoader;

} )()

FBXLoader = ( function () {

	var fbxTree;
	var connections;
	var sceneGraph;

	function FBXLoader( manager ) {

		Loader.call( this, manager );

	}

	FBXLoader.prototype = Object.assign( Object.create( Loader.prototype ), {

		constructor: FBXLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			var scope = this;

			var path = ( scope.path === '' ) ? LoaderUtils.extractUrlBase( url ) : scope.path;

			var loader = new FileLoader( this.manager );
			loader.setPath( scope.path );
			loader.setResponseType( 'arraybuffer' );

			loader.load( url, function ( buffer ) {

				try {

					onLoad( scope.parse( buffer, path ) );

				} catch ( error ) {

					setTimeout( function () {

						if ( onError ) onError( error );

						scope.manager.itemError( url );

					}, 0 );

				}

			}, onProgress, onError );

		},

		parse: function ( FBXBuffer, path ) {

			if ( isFbxFormatBinary( FBXBuffer ) ) {

				fbxTree = new BinaryParser().parse( FBXBuffer );

			} else {

				var FBXText = convertArrayBufferToString( FBXBuffer );

				if ( ! isFbxFormatASCII( FBXText ) ) {

					throw new Error( 'THREE.FBXLoader: Unknown format.' );

				}

				if ( getFbxVersion( FBXText ) < 7000 ) {

					throw new Error( 'THREE.FBXLoader: FBX version not supported, FileVersion: ' + getFbxVersion( FBXText ) );

				}

				fbxTree = new TextParser().parse( FBXText );

			}

			// console.log( fbxTree );

			var textureLoader = new TextureLoader( this.manager ).setPath( this.resourcePath || path ).setCrossOrigin( this.crossOrigin );

			return new FBXTreeParser( textureLoader, this.manager ).parse( fbxTree );

		}

	} );

	// Parse the FBXTree object returned by the BinaryParser or TextParser and return a Group
	function FBXTreeParser( textureLoader, manager ) {

		this.textureLoader = textureLoader;
		this.manager = manager;

	}

	FBXTreeParser.prototype = {

		constructor: FBXTreeParser,

		parse: function () {

			connections = this.parseConnections();

			var images = this.parseImages();
			var textures = this.parseTextures( images );
			var materials = this.parseMaterials( textures );
			var deformers = this.parseDeformers();
			var geometryMap = new GeometryParser().parse( deformers );

			this.parseScene( deformers, geometryMap, materials );

			return sceneGraph;

		},

		// Parses FBXTree.Connections which holds parent-child connections between objects (e.g. material -> texture, model->geometry )
		// and details the connection type
		parseConnections: function () {

			var connectionMap = new Map();

			if ( 'Connections' in fbxTree ) {

				var rawConnections = fbxTree.Connections.connections;

				rawConnections.forEach( function ( rawConnection ) {

					var fromID = rawConnection[ 0 ];
					var toID = rawConnection[ 1 ];
					var relationship = rawConnection[ 2 ];

					if ( ! connectionMap.has( fromID ) ) {

						connectionMap.set( fromID, {
							parents: [],
							children: []
						} );

					}

					var parentRelationship = { ID: toID, relationship: relationship };
					connectionMap.get( fromID ).parents.push( parentRelationship );

					if ( ! connectionMap.has( toID ) ) {

						connectionMap.set( toID, {
							parents: [],
							children: []
						} );

					}

					var childRelationship = { ID: fromID, relationship: relationship };
					connectionMap.get( toID ).children.push( childRelationship );

				} );

			}

			return connectionMap;

		},

		// Parse FBXTree.Objects.Video for embedded image data
		// These images are connected to textures in FBXTree.Objects.Textures
		// via FBXTree.Connections.
		parseImages: function () {

			var images = {};
			var blobs = {};

			if ( 'Video' in fbxTree.Objects ) {

				var videoNodes = fbxTree.Objects.Video;

				for ( var nodeID in videoNodes ) {

					var videoNode = videoNodes[ nodeID ];

					var id = parseInt( nodeID );

					images[ id ] = videoNode.RelativeFilename || videoNode.Filename;

					// raw image data is in videoNode.Content
					if ( 'Content' in videoNode ) {

						var arrayBufferContent = ( videoNode.Content instanceof ArrayBuffer ) && ( videoNode.Content.byteLength > 0 );
						var base64Content = ( typeof videoNode.Content === 'string' ) && ( videoNode.Content !== '' );

						if ( arrayBufferContent || base64Content ) {

							var image = this.parseImage( videoNodes[ nodeID ] );

							blobs[ videoNode.RelativeFilename || videoNode.Filename ] = image;

						}

					}

				}

			}

			for ( var id in images ) {

				var filename = images[ id ];

				if ( blobs[ filename ] !== undefined ) images[ id ] = blobs[ filename ];
				else images[ id ] = images[ id ].split( '\\' ).pop();

			}

			return images;

		},

		// Parse embedded image data in FBXTree.Video.Content
		parseImage: function ( videoNode ) {

			var content = videoNode.Content;
			var fileName = videoNode.RelativeFilename || videoNode.Filename;
			var extension = fileName.slice( fileName.lastIndexOf( '.' ) + 1 ).toLowerCase();

			var type;

			switch ( extension ) {

				case 'bmp':

					type = 'image/bmp';
					break;

				case 'jpg':
				case 'jpeg':

					type = 'image/jpeg';
					break;

				case 'png':

					type = 'image/png';
					break;

				case 'tif':

					type = 'image/tiff';
					break;

				case 'tga':

					if ( this.manager.getHandler( '.tga' ) === null ) {

						console.warn( 'FBXLoader: TGA loader not found, skipping ', fileName );

					}

					type = 'image/tga';
					break;

				default:

					console.warn( 'FBXLoader: Image type "' + extension + '" is not supported.' );
					return;

			}

			if ( typeof content === 'string' ) { // ASCII format

				return 'data:' + type + ';base64,' + content;

			} else { // Binary Format

				var array = new Uint8Array( content );
				return window.URL.createObjectURL( new Blob( [ array ], { type: type } ) );

			}

		},

		// Parse nodes in FBXTree.Objects.Texture
		// These contain details such as UV scaling, cropping, rotation etc and are connected
		// to images in FBXTree.Objects.Video
		parseTextures: function ( images ) {

			var textureMap = new Map();

			if ( 'Texture' in fbxTree.Objects ) {

				var textureNodes = fbxTree.Objects.Texture;
				for ( var nodeID in textureNodes ) {

					var texture = this.parseTexture( textureNodes[ nodeID ], images );
					textureMap.set( parseInt( nodeID ), texture );

				}

			}

			return textureMap;

		},

		// Parse individual node in FBXTree.Objects.Texture
		parseTexture: function ( textureNode, images ) {

			var texture = this.loadTexture( textureNode, images );

			texture.ID = textureNode.id;

			texture.name = textureNode.attrName;

			var wrapModeU = textureNode.WrapModeU;
			var wrapModeV = textureNode.WrapModeV;

			var valueU = wrapModeU !== undefined ? wrapModeU.value : 0;
			var valueV = wrapModeV !== undefined ? wrapModeV.value : 0;

			// http://download.autodesk.com/us/fbx/SDKdocs/FBX_SDK_Help/files/fbxsdkref/class_k_fbx_texture.html#889640e63e2e681259ea81061b85143a
			// 0: repeat(default), 1: clamp

			texture.wrapS = valueU === 0 ? RepeatWrapping : ClampToEdgeWrapping;
			texture.wrapT = valueV === 0 ? RepeatWrapping : ClampToEdgeWrapping;

			if ( 'Scaling' in textureNode ) {

				var values = textureNode.Scaling.value;

				texture.repeat.x = values[ 0 ];
				texture.repeat.y = values[ 1 ];

			}

			return texture;

		},

		// load a texture specified as a blob or data URI, or via an external URL using TextureLoader
		loadTexture: function ( textureNode, images ) {

			var fileName;

			var currentPath = this.textureLoader.path;

			var children = connections.get( textureNode.id ).children;

			if ( children !== undefined && children.length > 0 && images[ children[ 0 ].ID ] !== undefined ) {

				fileName = images[ children[ 0 ].ID ];

				if ( fileName.indexOf( 'blob:' ) === 0 || fileName.indexOf( 'data:' ) === 0 ) {

					this.textureLoader.setPath( undefined );

				}

			}

			var texture;

			var extension = textureNode.FileName.slice( - 3 ).toLowerCase();

			if ( extension === 'tga' ) {

				var loader = this.manager.getHandler( '.tga' );

				if ( loader === null ) {

					console.warn( 'FBXLoader: TGA loader not found, creating placeholder texture for', textureNode.RelativeFilename );
					texture = new Texture();

				} else {

					texture = loader.load( fileName );

				}

			} else if ( extension === 'psd' ) {

				console.warn( 'FBXLoader: PSD textures are not supported, creating placeholder texture for', textureNode.RelativeFilename );
				texture = new Texture();

			} else {

				texture = this.textureLoader.load( fileName );

			}

			this.textureLoader.setPath( currentPath );

			return texture;

		},

		// Parse nodes in FBXTree.Objects.Material
		parseMaterials: function ( textureMap ) {

			var materialMap = new Map();

			if ( 'Material' in fbxTree.Objects ) {

				var materialNodes = fbxTree.Objects.Material;

				for ( var nodeID in materialNodes ) {

					var material = this.parseMaterial( materialNodes[ nodeID ], textureMap );

					if ( material !== null ) materialMap.set( parseInt( nodeID ), material );

				}

			}

			return materialMap;

		},

		// Parse single node in FBXTree.Objects.Material
		// Materials are connected to texture maps in FBXTree.Objects.Textures
		// FBX format currently only supports Lambert and Phong shading models
		parseMaterial: function ( materialNode, textureMap ) {

			var ID = materialNode.id;
			var name = materialNode.attrName;
			var type = materialNode.ShadingModel;

			// Case where FBX wraps shading model in property object.
			if ( typeof type === 'object' ) {

				type = type.value;

			}

			// Ignore unused materials which don't have any connections.
			if ( ! connections.has( ID ) ) return null;

			var parameters = this.parseParameters( materialNode, textureMap, ID );

			var material;

			switch ( type.toLowerCase() ) {

				case 'phong':
					material = new MeshPhongMaterial();
					break;
				case 'lambert':
					material = new MeshLambertMaterial();
					break;
				default:
					console.warn( 'THREE.FBXLoader: unknown material type "%s". Defaulting to MeshPhongMaterial.', type );
					material = new MeshPhongMaterial();
					break;

			}

			material.setValues( parameters );
			material.name = name;

			return material;

		},

		// Parse FBX material and return parameters suitable for a three.js material
		// Also parse the texture map and return any textures associated with the material
		parseParameters: function ( materialNode, textureMap, ID ) {

			var parameters = {};

			if ( materialNode.BumpFactor ) {

				parameters.bumpScale = materialNode.BumpFactor.value;

			}

			if ( materialNode.Diffuse ) {

				parameters.color = new Color().fromArray( materialNode.Diffuse.value );

			} else if ( materialNode.DiffuseColor && materialNode.DiffuseColor.type === 'Color' ) {

				// The blender exporter exports diffuse here instead of in materialNode.Diffuse
				parameters.color = new Color().fromArray( materialNode.DiffuseColor.value );

			}

			if ( materialNode.DisplacementFactor ) {

				parameters.displacementScale = materialNode.DisplacementFactor.value;

			}

			if ( materialNode.Emissive ) {

				parameters.emissive = new Color().fromArray( materialNode.Emissive.value );

			} else if ( materialNode.EmissiveColor && materialNode.EmissiveColor.type === 'Color' ) {

				// The blender exporter exports emissive color here instead of in materialNode.Emissive
				parameters.emissive = new Color().fromArray( materialNode.EmissiveColor.value );

			}

			if ( materialNode.EmissiveFactor ) {

				parameters.emissiveIntensity = parseFloat( materialNode.EmissiveFactor.value );

			}

			if ( materialNode.Opacity ) {

				parameters.opacity = parseFloat( materialNode.Opacity.value );

			}

			if ( parameters.opacity < 1.0 ) {

				parameters.transparent = true;

			}

			if ( materialNode.ReflectionFactor ) {

				parameters.reflectivity = materialNode.ReflectionFactor.value;

			}

			if ( materialNode.Shininess ) {

				parameters.shininess = materialNode.Shininess.value;

			}

			if ( materialNode.Specular ) {

				parameters.specular = new Color().fromArray( materialNode.Specular.value );

			} else if ( materialNode.SpecularColor && materialNode.SpecularColor.type === 'Color' ) {

				// The blender exporter exports specular color here instead of in materialNode.Specular
				parameters.specular = new Color().fromArray( materialNode.SpecularColor.value );

			}

			var scope = this;
			connections.get( ID ).children.forEach( function ( child ) {

				var type = child.relationship;

				switch ( type ) {

					case 'Bump':
						parameters.bumpMap = scope.getTexture( textureMap, child.ID );
						break;

					case 'Maya|TEX_ao_map':
						parameters.aoMap = scope.getTexture( textureMap, child.ID );
						break;

					case 'DiffuseColor':
					case 'Maya|TEX_color_map':
						parameters.map = scope.getTexture( textureMap, child.ID );
						parameters.map.encoding = sRGBEncoding;
						break;

					case 'DisplacementColor':
						parameters.displacementMap = scope.getTexture( textureMap, child.ID );
						break;

					case 'EmissiveColor':
						parameters.emissiveMap = scope.getTexture( textureMap, child.ID );
						parameters.emissiveMap.encoding = sRGBEncoding;
						break;

					case 'NormalMap':
					case 'Maya|TEX_normal_map':
						parameters.normalMap = scope.getTexture( textureMap, child.ID );
						break;

					case 'ReflectionColor':
						parameters.envMap = scope.getTexture( textureMap, child.ID );
						parameters.envMap.mapping = EquirectangularReflectionMapping;
						parameters.envMap.encoding = sRGBEncoding;
						break;

					case 'SpecularColor':
						parameters.specularMap = scope.getTexture( textureMap, child.ID );
						parameters.specularMap.encoding = sRGBEncoding;
						break;

					case 'TransparentColor':
					case 'TransparencyFactor':
						parameters.alphaMap = scope.getTexture( textureMap, child.ID );
						parameters.transparent = true;
						break;

					case 'AmbientColor':
					case 'ShininessExponent': // AKA glossiness map
					case 'SpecularFactor': // AKA specularLevel
					case 'VectorDisplacementColor': // NOTE: Seems to be a copy of DisplacementColor
					default:
						console.warn( 'THREE.FBXLoader: %s map is not supported in three.js, skipping texture.', type );
						break;

				}

			} );

			return parameters;

		},

		// get a texture from the textureMap for use by a material.
		getTexture: function ( textureMap, id ) {

			// if the texture is a layered texture, just use the first layer and issue a warning
			if ( 'LayeredTexture' in fbxTree.Objects && id in fbxTree.Objects.LayeredTexture ) {

				console.warn( 'THREE.FBXLoader: layered textures are not supported in three.js. Discarding all but first layer.' );
				id = connections.get( id ).children[ 0 ].ID;

			}

			return textureMap.get( id );

		},

		// Parse nodes in FBXTree.Objects.Deformer
		// Deformer node can contain skinning or Vertex Cache animation data, however only skinning is supported here
		// Generates map of Skeleton-like objects for use later when generating and binding skeletons.
		parseDeformers: function () {

			var skeletons = {};
			var morphTargets = {};

			if ( 'Deformer' in fbxTree.Objects ) {

				var DeformerNodes = fbxTree.Objects.Deformer;

				for ( var nodeID in DeformerNodes ) {

					var deformerNode = DeformerNodes[ nodeID ];

					var relationships = connections.get( parseInt( nodeID ) );

					if ( deformerNode.attrType === 'Skin' ) {

						var skeleton = this.parseSkeleton( relationships, DeformerNodes );
						skeleton.ID = nodeID;

						if ( relationships.parents.length > 1 ) console.warn( 'THREE.FBXLoader: skeleton attached to more than one geometry is not supported.' );
						skeleton.geometryID = relationships.parents[ 0 ].ID;

						skeletons[ nodeID ] = skeleton;

					} else if ( deformerNode.attrType === 'BlendShape' ) {

						var morphTarget = {
							id: nodeID,
						};

						morphTarget.rawTargets = this.parseMorphTargets( relationships, DeformerNodes );
						morphTarget.id = nodeID;

						if ( relationships.parents.length > 1 ) console.warn( 'THREE.FBXLoader: morph target attached to more than one geometry is not supported.' );

						morphTargets[ nodeID ] = morphTarget;

					}

				}

			}

			return {

				skeletons: skeletons,
				morphTargets: morphTargets,

			};

		},

		// Parse single nodes in FBXTree.Objects.Deformer
		// The top level skeleton node has type 'Skin' and sub nodes have type 'Cluster'
		// Each skin node represents a skeleton and each cluster node represents a bone
		parseSkeleton: function ( relationships, deformerNodes ) {

			var rawBones = [];

			relationships.children.forEach( function ( child ) {

				var boneNode = deformerNodes[ child.ID ];

				if ( boneNode.attrType !== 'Cluster' ) return;

				var rawBone = {

					ID: child.ID,
					indices: [],
					weights: [],
					transformLink: new Matrix4().fromArray( boneNode.TransformLink.a ),
					// transform: new Matrix4().fromArray( boneNode.Transform.a ),
					// linkMode: boneNode.Mode,

				};

				if ( 'Indexes' in boneNode ) {

					rawBone.indices = boneNode.Indexes.a;
					rawBone.weights = boneNode.Weights.a;

				}

				rawBones.push( rawBone );

			} );

			return {

				rawBones: rawBones,
				bones: []

			};

		},

		// The top level morph deformer node has type "BlendShape" and sub nodes have type "BlendShapeChannel"
		parseMorphTargets: function ( relationships, deformerNodes ) {

			var rawMorphTargets = [];

			for ( var i = 0; i < relationships.children.length; i ++ ) {

				var child = relationships.children[ i ];

				var morphTargetNode = deformerNodes[ child.ID ];

				var rawMorphTarget = {

					name: morphTargetNode.attrName,
					initialWeight: morphTargetNode.DeformPercent,
					id: morphTargetNode.id,
					fullWeights: morphTargetNode.FullWeights.a

				};

				if ( morphTargetNode.attrType !== 'BlendShapeChannel' ) return;

				rawMorphTarget.geoID = connections.get( parseInt( child.ID ) ).children.filter( function ( child ) {

					return child.relationship === undefined;

				} )[ 0 ].ID;

				rawMorphTargets.push( rawMorphTarget );

			}

			return rawMorphTargets;

		},

		// create the main Group() to be returned by the loader
		parseScene: function ( deformers, geometryMap, materialMap ) {

			sceneGraph = new Group();

			var modelMap = this.parseModels( deformers.skeletons, geometryMap, materialMap );

			var modelNodes = fbxTree.Objects.Model;

			var scope = this;
			modelMap.forEach( function ( model ) {

				var modelNode = modelNodes[ model.ID ];
				scope.setLookAtProperties( model, modelNode );

				var parentConnections = connections.get( model.ID ).parents;

				parentConnections.forEach( function ( connection ) {

					var parent = modelMap.get( connection.ID );
					if ( parent !== undefined ) parent.add( model );

				} );

				if ( model.parent === null ) {

					sceneGraph.add( model );

				}


			} );

			this.bindSkeleton( deformers.skeletons, geometryMap, modelMap );

			this.createAmbientLight();

			this.setupMorphMaterials();

			sceneGraph.traverse( function ( node ) {

				if ( node.userData.transformData ) {

					if ( node.parent ) node.userData.transformData.parentMatrixWorld = node.parent.matrix;

					var transform = generateTransform( node.userData.transformData );

					node.applyMatrix4( transform );

				}

			} );

			var animations = new AnimationParser().parse();

			// if all the models where already combined in a single group, just return that
			if ( sceneGraph.children.length === 1 && sceneGraph.children[ 0 ].isGroup ) {

				sceneGraph.children[ 0 ].animations = animations;
				sceneGraph = sceneGraph.children[ 0 ];

			}

			sceneGraph.animations = animations;

		},

		// parse nodes in FBXTree.Objects.Model
		parseModels: function ( skeletons, geometryMap, materialMap ) {

			var modelMap = new Map();
			var modelNodes = fbxTree.Objects.Model;

			for ( var nodeID in modelNodes ) {

				var id = parseInt( nodeID );
				var node = modelNodes[ nodeID ];
				var relationships = connections.get( id );

				var model = this.buildSkeleton( relationships, skeletons, id, node.attrName );

				if ( ! model ) {

					switch ( node.attrType ) {

						case 'Camera':
							model = this.createCamera( relationships );
							break;
						case 'Light':
							model = this.createLight( relationships );
							break;
						case 'Mesh':
							model = this.createMesh( relationships, geometryMap, materialMap );
							break;
						case 'NurbsCurve':
							model = this.createCurve( relationships, geometryMap );
							break;
						case 'LimbNode':
						case 'Root':
							model = new Bone();
							break;
						case 'Null':
						default:
							model = new Group();
							break;

					}

					model.name = node.attrName ? PropertyBinding.sanitizeNodeName( node.attrName ) : '';

					model.ID = id;

				}

				this.getTransformData( model, node );
				modelMap.set( id, model );

			}

			return modelMap;

		},

		buildSkeleton: function ( relationships, skeletons, id, name ) {

			var bone = null;

			relationships.parents.forEach( function ( parent ) {

				for ( var ID in skeletons ) {

					var skeleton = skeletons[ ID ];

					skeleton.rawBones.forEach( function ( rawBone, i ) {

						if ( rawBone.ID === parent.ID ) {

							var subBone = bone;
							bone = new Bone();

							bone.matrixWorld.copy( rawBone.transformLink );

							// set name and id here - otherwise in cases where "subBone" is created it will not have a name / id

							bone.name = name ? PropertyBinding.sanitizeNodeName( name ) : '';
							bone.ID = id;

							skeleton.bones[ i ] = bone;

							// In cases where a bone is shared between multiple meshes
							// duplicate the bone here and and it as a child of the first bone
							if ( subBone !== null ) {

								bone.add( subBone );

							}

						}

					} );

				}

			} );

			return bone;

		},

		// create a PerspectiveCamera or OrthographicCamera
		createCamera: function ( relationships ) {

			var model;
			var cameraAttribute;

			relationships.children.forEach( function ( child ) {

				var attr = fbxTree.Objects.NodeAttribute[ child.ID ];

				if ( attr !== undefined ) {

					cameraAttribute = attr;

				}

			} );

			if ( cameraAttribute === undefined ) {

				model = new Object3D();

			} else {

				var type = 0;
				if ( cameraAttribute.CameraProjectionType !== undefined && cameraAttribute.CameraProjectionType.value === 1 ) {

					type = 1;

				}

				var nearClippingPlane = 1;
				if ( cameraAttribute.NearPlane !== undefined ) {

					nearClippingPlane = cameraAttribute.NearPlane.value / 1000;

				}

				var farClippingPlane = 1000;
				if ( cameraAttribute.FarPlane !== undefined ) {

					farClippingPlane = cameraAttribute.FarPlane.value / 1000;

				}


				var width = window.innerWidth;
				var height = window.innerHeight;

				if ( cameraAttribute.AspectWidth !== undefined && cameraAttribute.AspectHeight !== undefined ) {

					width = cameraAttribute.AspectWidth.value;
					height = cameraAttribute.AspectHeight.value;

				}

				var aspect = width / height;

				var fov = 45;
				if ( cameraAttribute.FieldOfView !== undefined ) {

					fov = cameraAttribute.FieldOfView.value;

				}

				var focalLength = cameraAttribute.FocalLength ? cameraAttribute.FocalLength.value : null;

				switch ( type ) {

					case 0: // Perspective
						model = new PerspectiveCamera( fov, aspect, nearClippingPlane, farClippingPlane );
						if ( focalLength !== null ) model.setFocalLength( focalLength );
						break;

					case 1: // Orthographic
						model = new OrthographicCamera( - width / 2, width / 2, height / 2, - height / 2, nearClippingPlane, farClippingPlane );
						break;

					default:
						console.warn( 'THREE.FBXLoader: Unknown camera type ' + type + '.' );
						model = new Object3D();
						break;

				}

			}

			return model;

		},

		// Create a DirectionalLight, PointLight or SpotLight
		createLight: function ( relationships ) {

			var model;
			var lightAttribute;

			relationships.children.forEach( function ( child ) {

				var attr = fbxTree.Objects.NodeAttribute[ child.ID ];

				if ( attr !== undefined ) {

					lightAttribute = attr;

				}

			} );

			if ( lightAttribute === undefined ) {

				model = new Object3D();

			} else {

				var type;

				// LightType can be undefined for Point lights
				if ( lightAttribute.LightType === undefined ) {

					type = 0;

				} else {

					type = lightAttribute.LightType.value;

				}

				var color = 0xffffff;

				if ( lightAttribute.Color !== undefined ) {

					color = new Color().fromArray( lightAttribute.Color.value );

				}

				var intensity = ( lightAttribute.Intensity === undefined ) ? 1 : lightAttribute.Intensity.value / 100;

				// light disabled
				if ( lightAttribute.CastLightOnObject !== undefined && lightAttribute.CastLightOnObject.value === 0 ) {

					intensity = 0;

				}

				var distance = 0;
				if ( lightAttribute.FarAttenuationEnd !== undefined ) {

					if ( lightAttribute.EnableFarAttenuation !== undefined && lightAttribute.EnableFarAttenuation.value === 0 ) {

						distance = 0;

					} else {

						distance = lightAttribute.FarAttenuationEnd.value;

					}

				}

				// TODO: could this be calculated linearly from FarAttenuationStart to FarAttenuationEnd?
				var decay = 1;

				switch ( type ) {

					case 0: // Point
						model = new PointLight( color, intensity, distance, decay );
						break;

					case 1: // Directional
						model = new DirectionalLight( color, intensity );
						break;

					case 2: // Spot
						var angle = Math.PI / 3;

						if ( lightAttribute.InnerAngle !== undefined ) {

							angle = MathUtils.degToRad( lightAttribute.InnerAngle.value );

						}

						var penumbra = 0;
						if ( lightAttribute.OuterAngle !== undefined ) {

							// TODO: this is not correct - FBX calculates outer and inner angle in degrees
							// with OuterAngle > InnerAngle && OuterAngle <= Math.PI
							// while three.js uses a penumbra between (0, 1) to attenuate the inner angle
							penumbra = MathUtils.degToRad( lightAttribute.OuterAngle.value );
							penumbra = Math.max( penumbra, 1 );

						}

						model = new SpotLight( color, intensity, distance, angle, penumbra, decay );
						break;

					default:
						console.warn( 'THREE.FBXLoader: Unknown light type ' + lightAttribute.LightType.value + ', defaulting to a PointLight.' );
						model = new PointLight( color, intensity );
						break;

				}

				if ( lightAttribute.CastShadows !== undefined && lightAttribute.CastShadows.value === 1 ) {

					model.castShadow = true;

				}

			}

			return model;

		},

		createMesh: function ( relationships, geometryMap, materialMap ) {

			var model;
			var geometry = null;
			var material = null;
			var materials = [];

			// get geometry and materials(s) from connections
			relationships.children.forEach( function ( child ) {

				if ( geometryMap.has( child.ID ) ) {

					geometry = geometryMap.get( child.ID );

				}

				if ( materialMap.has( child.ID ) ) {

					materials.push( materialMap.get( child.ID ) );

				}

			} );

			if ( materials.length > 1 ) {

				material = materials;

			} else if ( materials.length > 0 ) {

				material = materials[ 0 ];

			} else {

				material = new MeshPhongMaterial( { color: 0xcccccc } );
				materials.push( material );

			}

			if ( 'color' in geometry.attributes ) {

				materials.forEach( function ( material ) {

					material.vertexColors = true;

				} );

			}

			if ( geometry.FBX_Deformer ) {

				materials.forEach( function ( material ) {

					material.skinning = true;

				} );

				model = new SkinnedMesh( geometry, material );
				model.normalizeSkinWeights();

			} else {

				model = new Mesh( geometry, material );

			}

			return model;

		},

		createCurve: function ( relationships, geometryMap ) {

			var geometry = relationships.children.reduce( function ( geo, child ) {

				if ( geometryMap.has( child.ID ) ) geo = geometryMap.get( child.ID );

				return geo;

			}, null );

			// FBX does not list materials for Nurbs lines, so we'll just put our own in here.
			var material = new LineBasicMaterial( { color: 0x3300ff, linewidth: 1 } );
			return new Line( geometry, material );

		},

		// parse the model node for transform data
		getTransformData: function ( model, modelNode ) {

			var transformData = {};

			if ( 'InheritType' in modelNode ) transformData.inheritType = parseInt( modelNode.InheritType.value );

			if ( 'RotationOrder' in modelNode ) transformData.eulerOrder = getEulerOrder( modelNode.RotationOrder.value );
			else transformData.eulerOrder = 'ZYX';

			if ( 'Lcl_Translation' in modelNode ) transformData.translation = modelNode.Lcl_Translation.value;

			if ( 'PreRotation' in modelNode ) transformData.preRotation = modelNode.PreRotation.value;
			if ( 'Lcl_Rotation' in modelNode ) transformData.rotation = modelNode.Lcl_Rotation.value;
			if ( 'PostRotation' in modelNode ) transformData.postRotation = modelNode.PostRotation.value;

			if ( 'Lcl_Scaling' in modelNode ) transformData.scale = modelNode.Lcl_Scaling.value;

			if ( 'ScalingOffset' in modelNode ) transformData.scalingOffset = modelNode.ScalingOffset.value;
			if ( 'ScalingPivot' in modelNode ) transformData.scalingPivot = modelNode.ScalingPivot.value;

			if ( 'RotationOffset' in modelNode ) transformData.rotationOffset = modelNode.RotationOffset.value;
			if ( 'RotationPivot' in modelNode ) transformData.rotationPivot = modelNode.RotationPivot.value;

			model.userData.transformData = transformData;

		},

		setLookAtProperties: function ( model, modelNode ) {

			if ( 'LookAtProperty' in modelNode ) {

				var children = connections.get( model.ID ).children;

				children.forEach( function ( child ) {

					if ( child.relationship === 'LookAtProperty' ) {

						var lookAtTarget = fbxTree.Objects.Model[ child.ID ];

						if ( 'Lcl_Translation' in lookAtTarget ) {

							var pos = lookAtTarget.Lcl_Translation.value;

							// DirectionalLight, SpotLight
							if ( model.target !== undefined ) {

								model.target.position.fromArray( pos );
								sceneGraph.add( model.target );

							} else { // Cameras and other Object3Ds

								model.lookAt( new Vector3().fromArray( pos ) );

							}

						}

					}

				} );

			}

		},

		bindSkeleton: function ( skeletons, geometryMap, modelMap ) {

			var bindMatrices = this.parsePoseNodes();

			for ( var ID in skeletons ) {

				var skeleton = skeletons[ ID ];

				var parents = connections.get( parseInt( skeleton.ID ) ).parents;

				parents.forEach( function ( parent ) {

					if ( geometryMap.has( parent.ID ) ) {

						var geoID = parent.ID;
						var geoRelationships = connections.get( geoID );

						geoRelationships.parents.forEach( function ( geoConnParent ) {

							if ( modelMap.has( geoConnParent.ID ) ) {

								var model = modelMap.get( geoConnParent.ID );

								model.bind( new Skeleton( skeleton.bones ), bindMatrices[ geoConnParent.ID ] );

							}

						} );

					}

				} );

			}

		},

		parsePoseNodes: function () {

			var bindMatrices = {};

			if ( 'Pose' in fbxTree.Objects ) {

				var BindPoseNode = fbxTree.Objects.Pose;

				for ( var nodeID in BindPoseNode ) {

					if ( BindPoseNode[ nodeID ].attrType === 'BindPose' ) {

						var poseNodes = BindPoseNode[ nodeID ].PoseNode;

						if ( Array.isArray( poseNodes ) ) {

							poseNodes.forEach( function ( poseNode ) {

								bindMatrices[ poseNode.Node ] = new Matrix4().fromArray( poseNode.Matrix.a );

							} );

						} else {

							bindMatrices[ poseNodes.Node ] = new Matrix4().fromArray( poseNodes.Matrix.a );

						}

					}

				}

			}

			return bindMatrices;

		},

		// Parse ambient color in FBXTree.GlobalSettings - if it's not set to black (default), create an ambient light
		createAmbientLight: function () {

			if ( 'GlobalSettings' in fbxTree && 'AmbientColor' in fbxTree.GlobalSettings ) {

				var ambientColor = fbxTree.GlobalSettings.AmbientColor.value;
				var r = ambientColor[ 0 ];
				var g = ambientColor[ 1 ];
				var b = ambientColor[ 2 ];

				if ( r !== 0 || g !== 0 || b !== 0 ) {

					var color = new Color( r, g, b );
					sceneGraph.add( new AmbientLight( color, 1 ) );

				}

			}

		},

		setupMorphMaterials: function () {

			var scope = this;
			sceneGraph.traverse( function ( child ) {

				if ( child.isMesh ) {

					if ( child.geometry.morphAttributes.position && child.geometry.morphAttributes.position.length ) {

						if ( Array.isArray( child.material ) ) {

							child.material.forEach( function ( material, i ) {

								scope.setupMorphMaterial( child, material, i );

							} );

						} else {

							scope.setupMorphMaterial( child, child.material );

						}

					}

				}

			} );

		},

		setupMorphMaterial: function ( child, material, index ) {

			var uuid = child.uuid;
			var matUuid = material.uuid;

			// if a geometry has morph targets, it cannot share the material with other geometries
			var sharedMat = false;

			sceneGraph.traverse( function ( node ) {

				if ( node.isMesh ) {

					if ( Array.isArray( node.material ) ) {

						node.material.forEach( function ( mat ) {

							if ( mat.uuid === matUuid && node.uuid !== uuid ) sharedMat = true;

						} );

					} else if ( node.material.uuid === matUuid && node.uuid !== uuid ) sharedMat = true;

				}

			} );

			if ( sharedMat === true ) {

				var clonedMat = material.clone();
				clonedMat.morphTargets = true;

				if ( index === undefined ) child.material = clonedMat;
				else child.material[ index ] = clonedMat;

			} else material.morphTargets = true;

		}

	};

	// parse Geometry data from FBXTree and return map of BufferGeometries
	function GeometryParser() {}

	GeometryParser.prototype = {

		constructor: GeometryParser,

		// Parse nodes in FBXTree.Objects.Geometry
		parse: function ( deformers ) {

			var geometryMap = new Map();

			if ( 'Geometry' in fbxTree.Objects ) {

				var geoNodes = fbxTree.Objects.Geometry;

				for ( var nodeID in geoNodes ) {

					var relationships = connections.get( parseInt( nodeID ) );
					var geo = this.parseGeometry( relationships, geoNodes[ nodeID ], deformers );

					geometryMap.set( parseInt( nodeID ), geo );

				}

			}

			return geometryMap;

		},

		// Parse single node in FBXTree.Objects.Geometry
		parseGeometry: function ( relationships, geoNode, deformers ) {

			switch ( geoNode.attrType ) {

				case 'Mesh':
					return this.parseMeshGeometry( relationships, geoNode, deformers );
					break;

				case 'NurbsCurve':
					return this.parseNurbsGeometry( geoNode );
					break;

			}

		},


		// Parse single node mesh geometry in FBXTree.Objects.Geometry
		parseMeshGeometry: function ( relationships, geoNode, deformers ) {

			var skeletons = deformers.skeletons;
			var morphTargets = [];

			var modelNodes = relationships.parents.map( function ( parent ) {

				return fbxTree.Objects.Model[ parent.ID ];

			} );

			// don't create geometry if it is not associated with any models
			if ( modelNodes.length === 0 ) return;

			var skeleton = relationships.children.reduce( function ( skeleton, child ) {

				if ( skeletons[ child.ID ] !== undefined ) skeleton = skeletons[ child.ID ];

				return skeleton;

			}, null );

			relationships.children.forEach( function ( child ) {

				if ( deformers.morphTargets[ child.ID ] !== undefined ) {

					morphTargets.push( deformers.morphTargets[ child.ID ] );

				}

			} );

			// Assume one model and get the preRotation from that
			// if there is more than one model associated with the geometry this may cause problems
			var modelNode = modelNodes[ 0 ];

			var transformData = {};

			if ( 'RotationOrder' in modelNode ) transformData.eulerOrder = getEulerOrder( modelNode.RotationOrder.value );
			if ( 'InheritType' in modelNode ) transformData.inheritType = parseInt( modelNode.InheritType.value );

			if ( 'GeometricTranslation' in modelNode ) transformData.translation = modelNode.GeometricTranslation.value;
			if ( 'GeometricRotation' in modelNode ) transformData.rotation = modelNode.GeometricRotation.value;
			if ( 'GeometricScaling' in modelNode ) transformData.scale = modelNode.GeometricScaling.value;

			var transform = generateTransform( transformData );

			return this.genGeometry( geoNode, skeleton, morphTargets, transform );

		},

		// Generate a BufferGeometry from a node in FBXTree.Objects.Geometry
		genGeometry: function ( geoNode, skeleton, morphTargets, preTransform ) {

			var geo = new BufferGeometry();
			if ( geoNode.attrName ) geo.name = geoNode.attrName;

			var geoInfo = this.parseGeoNode( geoNode, skeleton );
			var buffers = this.genBuffers( geoInfo );

			var positionAttribute = new Float32BufferAttribute( buffers.vertex, 3 );

			positionAttribute.applyMatrix4( preTransform );

			geo.setAttribute( 'position', positionAttribute );

			if ( buffers.colors.length > 0 ) {

				geo.setAttribute( 'color', new Float32BufferAttribute( buffers.colors, 3 ) );

			}

			if ( skeleton ) {

				geo.setAttribute( 'skinIndex', new Uint16BufferAttribute( buffers.weightsIndices, 4 ) );

				geo.setAttribute( 'skinWeight', new Float32BufferAttribute( buffers.vertexWeights, 4 ) );

				// used later to bind the skeleton to the model
				geo.FBX_Deformer = skeleton;

			}

			if ( buffers.normal.length > 0 ) {

				var normalMatrix = new Matrix3().getNormalMatrix( preTransform );

				var normalAttribute = new Float32BufferAttribute( buffers.normal, 3 );
				normalAttribute.applyNormalMatrix( normalMatrix );

				geo.setAttribute( 'normal', normalAttribute );

			}

			buffers.uvs.forEach( function ( uvBuffer, i ) {

				// subsequent uv buffers are called 'uv1', 'uv2', ...
				var name = 'uv' + ( i + 1 ).toString();

				// the first uv buffer is just called 'uv'
				if ( i === 0 ) {

					name = 'uv';

				}

				geo.setAttribute( name, new Float32BufferAttribute( buffers.uvs[ i ], 2 ) );

			} );

			if ( geoInfo.material && geoInfo.material.mappingType !== 'AllSame' ) {

				// Convert the material indices of each vertex into rendering groups on the geometry.
				var prevMaterialIndex = buffers.materialIndex[ 0 ];
				var startIndex = 0;

				buffers.materialIndex.forEach( function ( currentIndex, i ) {

					if ( currentIndex !== prevMaterialIndex ) {

						geo.addGroup( startIndex, i - startIndex, prevMaterialIndex );

						prevMaterialIndex = currentIndex;
						startIndex = i;

					}

				} );

				// the loop above doesn't add the last group, do that here.
				if ( geo.groups.length > 0 ) {

					var lastGroup = geo.groups[ geo.groups.length - 1 ];
					var lastIndex = lastGroup.start + lastGroup.count;

					if ( lastIndex !== buffers.materialIndex.length ) {

						geo.addGroup( lastIndex, buffers.materialIndex.length - lastIndex, prevMaterialIndex );

					}

				}

				// case where there are multiple materials but the whole geometry is only
				// using one of them
				if ( geo.groups.length === 0 ) {

					geo.addGroup( 0, buffers.materialIndex.length, buffers.materialIndex[ 0 ] );

				}

			}

			this.addMorphTargets( geo, geoNode, morphTargets, preTransform );

			return geo;

		},

		parseGeoNode: function ( geoNode, skeleton ) {

			var geoInfo = {};

			geoInfo.vertexPositions = ( geoNode.Vertices !== undefined ) ? geoNode.Vertices.a : [];
			geoInfo.vertexIndices = ( geoNode.PolygonVertexIndex !== undefined ) ? geoNode.PolygonVertexIndex.a : [];

			if ( geoNode.LayerElementColor ) {

				geoInfo.color = this.parseVertexColors( geoNode.LayerElementColor[ 0 ] );

			}

			if ( geoNode.LayerElementMaterial ) {

				geoInfo.material = this.parseMaterialIndices( geoNode.LayerElementMaterial[ 0 ] );

			}

			if ( geoNode.LayerElementNormal ) {

				geoInfo.normal = this.parseNormals( geoNode.LayerElementNormal[ 0 ] );

			}

			if ( geoNode.LayerElementUV ) {

				geoInfo.uv = [];

				var i = 0;
				while ( geoNode.LayerElementUV[ i ] ) {

					geoInfo.uv.push( this.parseUVs( geoNode.LayerElementUV[ i ] ) );
					i ++;

				}

			}

			geoInfo.weightTable = {};

			if ( skeleton !== null ) {

				geoInfo.skeleton = skeleton;

				skeleton.rawBones.forEach( function ( rawBone, i ) {

					// loop over the bone's vertex indices and weights
					rawBone.indices.forEach( function ( index, j ) {

						if ( geoInfo.weightTable[ index ] === undefined ) geoInfo.weightTable[ index ] = [];

						geoInfo.weightTable[ index ].push( {

							id: i,
							weight: rawBone.weights[ j ],

						} );

					} );

				} );

			}

			return geoInfo;

		},

		genBuffers: function ( geoInfo ) {

			var buffers = {
				vertex: [],
				normal: [],
				colors: [],
				uvs: [],
				materialIndex: [],
				vertexWeights: [],
				weightsIndices: [],
			};

			var polygonIndex = 0;
			var faceLength = 0;
			var displayedWeightsWarning = false;

			// these will hold data for a single face
			var facePositionIndexes = [];
			var faceNormals = [];
			var faceColors = [];
			var faceUVs = [];
			var faceWeights = [];
			var faceWeightIndices = [];

			var scope = this;
			geoInfo.vertexIndices.forEach( function ( vertexIndex, polygonVertexIndex ) {

				var endOfFace = false;

				// Face index and vertex index arrays are combined in a single array
				// A cube with quad faces looks like this:
				// PolygonVertexIndex: *24 {
				//  a: 0, 1, 3, -3, 2, 3, 5, -5, 4, 5, 7, -7, 6, 7, 1, -1, 1, 7, 5, -4, 6, 0, 2, -5
				//  }
				// Negative numbers mark the end of a face - first face here is 0, 1, 3, -3
				// to find index of last vertex bit shift the index: ^ - 1
				if ( vertexIndex < 0 ) {

					vertexIndex = vertexIndex ^ - 1; // equivalent to ( x * -1 ) - 1
					endOfFace = true;

				}

				var weightIndices = [];
				var weights = [];

				facePositionIndexes.push( vertexIndex * 3, vertexIndex * 3 + 1, vertexIndex * 3 + 2 );

				if ( geoInfo.color ) {

					var data = getData( polygonVertexIndex, polygonIndex, vertexIndex, geoInfo.color );

					faceColors.push( data[ 0 ], data[ 1 ], data[ 2 ] );

				}

				if ( geoInfo.skeleton ) {

					if ( geoInfo.weightTable[ vertexIndex ] !== undefined ) {

						geoInfo.weightTable[ vertexIndex ].forEach( function ( wt ) {

							weights.push( wt.weight );
							weightIndices.push( wt.id );

						} );


					}

					if ( weights.length > 4 ) {

						if ( ! displayedWeightsWarning ) {

							console.warn( 'THREE.FBXLoader: Vertex has more than 4 skinning weights assigned to vertex. Deleting additional weights.' );
							displayedWeightsWarning = true;

						}

						var wIndex = [ 0, 0, 0, 0 ];
						var Weight = [ 0, 0, 0, 0 ];

						weights.forEach( function ( weight, weightIndex ) {

							var currentWeight = weight;
							var currentIndex = weightIndices[ weightIndex ];

							Weight.forEach( function ( comparedWeight, comparedWeightIndex, comparedWeightArray ) {

								if ( currentWeight > comparedWeight ) {

									comparedWeightArray[ comparedWeightIndex ] = currentWeight;
									currentWeight = comparedWeight;

									var tmp = wIndex[ comparedWeightIndex ];
									wIndex[ comparedWeightIndex ] = currentIndex;
									currentIndex = tmp;

								}

							} );

						} );

						weightIndices = wIndex;
						weights = Weight;

					}

					// if the weight array is shorter than 4 pad with 0s
					while ( weights.length < 4 ) {

						weights.push( 0 );
						weightIndices.push( 0 );

					}

					for ( var i = 0; i < 4; ++ i ) {

						faceWeights.push( weights[ i ] );
						faceWeightIndices.push( weightIndices[ i ] );

					}

				}

				if ( geoInfo.normal ) {

					var data = getData( polygonVertexIndex, polygonIndex, vertexIndex, geoInfo.normal );

					faceNormals.push( data[ 0 ], data[ 1 ], data[ 2 ] );

				}

				if ( geoInfo.material && geoInfo.material.mappingType !== 'AllSame' ) {

					var materialIndex = getData( polygonVertexIndex, polygonIndex, vertexIndex, geoInfo.material )[ 0 ];

				}

				if ( geoInfo.uv ) {

					geoInfo.uv.forEach( function ( uv, i ) {

						var data = getData( polygonVertexIndex, polygonIndex, vertexIndex, uv );

						if ( faceUVs[ i ] === undefined ) {

							faceUVs[ i ] = [];

						}

						faceUVs[ i ].push( data[ 0 ] );
						faceUVs[ i ].push( data[ 1 ] );

					} );

				}

				faceLength ++;

				if ( endOfFace ) {

					scope.genFace( buffers, geoInfo, facePositionIndexes, materialIndex, faceNormals, faceColors, faceUVs, faceWeights, faceWeightIndices, faceLength );

					polygonIndex ++;
					faceLength = 0;

					// reset arrays for the next face
					facePositionIndexes = [];
					faceNormals = [];
					faceColors = [];
					faceUVs = [];
					faceWeights = [];
					faceWeightIndices = [];

				}

			} );

			return buffers;

		},

		// Generate data for a single face in a geometry. If the face is a quad then split it into 2 tris
		genFace: function ( buffers, geoInfo, facePositionIndexes, materialIndex, faceNormals, faceColors, faceUVs, faceWeights, faceWeightIndices, faceLength ) {

			for ( var i = 2; i < faceLength; i ++ ) {

				buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ 0 ] ] );
				buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ 1 ] ] );
				buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ 2 ] ] );

				buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ ( i - 1 ) * 3 ] ] );
				buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ ( i - 1 ) * 3 + 1 ] ] );
				buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ ( i - 1 ) * 3 + 2 ] ] );

				buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ i * 3 ] ] );
				buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ i * 3 + 1 ] ] );
				buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ i * 3 + 2 ] ] );

				if ( geoInfo.skeleton ) {

					buffers.vertexWeights.push( faceWeights[ 0 ] );
					buffers.vertexWeights.push( faceWeights[ 1 ] );
					buffers.vertexWeights.push( faceWeights[ 2 ] );
					buffers.vertexWeights.push( faceWeights[ 3 ] );

					buffers.vertexWeights.push( faceWeights[ ( i - 1 ) * 4 ] );
					buffers.vertexWeights.push( faceWeights[ ( i - 1 ) * 4 + 1 ] );
					buffers.vertexWeights.push( faceWeights[ ( i - 1 ) * 4 + 2 ] );
					buffers.vertexWeights.push( faceWeights[ ( i - 1 ) * 4 + 3 ] );

					buffers.vertexWeights.push( faceWeights[ i * 4 ] );
					buffers.vertexWeights.push( faceWeights[ i * 4 + 1 ] );
					buffers.vertexWeights.push( faceWeights[ i * 4 + 2 ] );
					buffers.vertexWeights.push( faceWeights[ i * 4 + 3 ] );

					buffers.weightsIndices.push( faceWeightIndices[ 0 ] );
					buffers.weightsIndices.push( faceWeightIndices[ 1 ] );
					buffers.weightsIndices.push( faceWeightIndices[ 2 ] );
					buffers.weightsIndices.push( faceWeightIndices[ 3 ] );

					buffers.weightsIndices.push( faceWeightIndices[ ( i - 1 ) * 4 ] );
					buffers.weightsIndices.push( faceWeightIndices[ ( i - 1 ) * 4 + 1 ] );
					buffers.weightsIndices.push( faceWeightIndices[ ( i - 1 ) * 4 + 2 ] );
					buffers.weightsIndices.push( faceWeightIndices[ ( i - 1 ) * 4 + 3 ] );

					buffers.weightsIndices.push( faceWeightIndices[ i * 4 ] );
					buffers.weightsIndices.push( faceWeightIndices[ i * 4 + 1 ] );
					buffers.weightsIndices.push( faceWeightIndices[ i * 4 + 2 ] );
					buffers.weightsIndices.push( faceWeightIndices[ i * 4 + 3 ] );

				}

				if ( geoInfo.color ) {

					buffers.colors.push( faceColors[ 0 ] );
					buffers.colors.push( faceColors[ 1 ] );
					buffers.colors.push( faceColors[ 2 ] );

					buffers.colors.push( faceColors[ ( i - 1 ) * 3 ] );
					buffers.colors.push( faceColors[ ( i - 1 ) * 3 + 1 ] );
					buffers.colors.push( faceColors[ ( i - 1 ) * 3 + 2 ] );

					buffers.colors.push( faceColors[ i * 3 ] );
					buffers.colors.push( faceColors[ i * 3 + 1 ] );
					buffers.colors.push( faceColors[ i * 3 + 2 ] );

				}

				if ( geoInfo.material && geoInfo.material.mappingType !== 'AllSame' ) {

					buffers.materialIndex.push( materialIndex );
					buffers.materialIndex.push( materialIndex );
					buffers.materialIndex.push( materialIndex );

				}

				if ( geoInfo.normal ) {

					buffers.normal.push( faceNormals[ 0 ] );
					buffers.normal.push( faceNormals[ 1 ] );
					buffers.normal.push( faceNormals[ 2 ] );

					buffers.normal.push( faceNormals[ ( i - 1 ) * 3 ] );
					buffers.normal.push( faceNormals[ ( i - 1 ) * 3 + 1 ] );
					buffers.normal.push( faceNormals[ ( i - 1 ) * 3 + 2 ] );

					buffers.normal.push( faceNormals[ i * 3 ] );
					buffers.normal.push( faceNormals[ i * 3 + 1 ] );
					buffers.normal.push( faceNormals[ i * 3 + 2 ] );

				}

				if ( geoInfo.uv ) {

					geoInfo.uv.forEach( function ( uv, j ) {

						if ( buffers.uvs[ j ] === undefined ) buffers.uvs[ j ] = [];

						buffers.uvs[ j ].push( faceUVs[ j ][ 0 ] );
						buffers.uvs[ j ].push( faceUVs[ j ][ 1 ] );

						buffers.uvs[ j ].push( faceUVs[ j ][ ( i - 1 ) * 2 ] );
						buffers.uvs[ j ].push( faceUVs[ j ][ ( i - 1 ) * 2 + 1 ] );

						buffers.uvs[ j ].push( faceUVs[ j ][ i * 2 ] );
						buffers.uvs[ j ].push( faceUVs[ j ][ i * 2 + 1 ] );

					} );

				}

			}

		},

		addMorphTargets: function ( parentGeo, parentGeoNode, morphTargets, preTransform ) {

			if ( morphTargets.length === 0 ) return;

			parentGeo.morphTargetsRelative = true;

			parentGeo.morphAttributes.position = [];
			// parentGeo.morphAttributes.normal = []; // not implemented

			var scope = this;
			morphTargets.forEach( function ( morphTarget ) {

				morphTarget.rawTargets.forEach( function ( rawTarget ) {

					var morphGeoNode = fbxTree.Objects.Geometry[ rawTarget.geoID ];

					if ( morphGeoNode !== undefined ) {

						scope.genMorphGeometry( parentGeo, parentGeoNode, morphGeoNode, preTransform, rawTarget.name );

					}

				} );

			} );

		},

		// a morph geometry node is similar to a standard  node, and the node is also contained
		// in FBXTree.Objects.Geometry, however it can only have attributes for position, normal
		// and a special attribute Index defining which vertices of the original geometry are affected
		// Normal and position attributes only have data for the vertices that are affected by the morph
		genMorphGeometry: function ( parentGeo, parentGeoNode, morphGeoNode, preTransform, name ) {

			var vertexIndices = ( parentGeoNode.PolygonVertexIndex !== undefined ) ? parentGeoNode.PolygonVertexIndex.a : [];

			var morphPositionsSparse = ( morphGeoNode.Vertices !== undefined ) ? morphGeoNode.Vertices.a : [];
			var indices = ( morphGeoNode.Indexes !== undefined ) ? morphGeoNode.Indexes.a : [];

			var length = parentGeo.attributes.position.count * 3;
			var morphPositions = new Float32Array( length );

			for ( var i = 0; i < indices.length; i ++ ) {

				var morphIndex = indices[ i ] * 3;

				morphPositions[ morphIndex ] = morphPositionsSparse[ i * 3 ];
				morphPositions[ morphIndex + 1 ] = morphPositionsSparse[ i * 3 + 1 ];
				morphPositions[ morphIndex + 2 ] = morphPositionsSparse[ i * 3 + 2 ];

			}

			// TODO: add morph normal support
			var morphGeoInfo = {
				vertexIndices: vertexIndices,
				vertexPositions: morphPositions,

			};

			var morphBuffers = this.genBuffers( morphGeoInfo );

			var positionAttribute = new Float32BufferAttribute( morphBuffers.vertex, 3 );
			positionAttribute.name = name || morphGeoNode.attrName;

			positionAttribute.applyMatrix4( preTransform );

			parentGeo.morphAttributes.position.push( positionAttribute );

		},

		// Parse normal from FBXTree.Objects.Geometry.LayerElementNormal if it exists
		parseNormals: function ( NormalNode ) {

			var mappingType = NormalNode.MappingInformationType;
			var referenceType = NormalNode.ReferenceInformationType;
			var buffer = NormalNode.Normals.a;
			var indexBuffer = [];
			if ( referenceType === 'IndexToDirect' ) {

				if ( 'NormalIndex' in NormalNode ) {

					indexBuffer = NormalNode.NormalIndex.a;

				} else if ( 'NormalsIndex' in NormalNode ) {

					indexBuffer = NormalNode.NormalsIndex.a;

				}

			}

			return {
				dataSize: 3,
				buffer: buffer,
				indices: indexBuffer,
				mappingType: mappingType,
				referenceType: referenceType
			};

		},

		// Parse UVs from FBXTree.Objects.Geometry.LayerElementUV if it exists
		parseUVs: function ( UVNode ) {

			var mappingType = UVNode.MappingInformationType;
			var referenceType = UVNode.ReferenceInformationType;
			var buffer = UVNode.UV.a;
			var indexBuffer = [];
			if ( referenceType === 'IndexToDirect' ) {

				indexBuffer = UVNode.UVIndex.a;

			}

			return {
				dataSize: 2,
				buffer: buffer,
				indices: indexBuffer,
				mappingType: mappingType,
				referenceType: referenceType
			};

		},

		// Parse Vertex Colors from FBXTree.Objects.Geometry.LayerElementColor if it exists
		parseVertexColors: function ( ColorNode ) {

			var mappingType = ColorNode.MappingInformationType;
			var referenceType = ColorNode.ReferenceInformationType;
			var buffer = ColorNode.Colors.a;
			var indexBuffer = [];
			if ( referenceType === 'IndexToDirect' ) {

				indexBuffer = ColorNode.ColorIndex.a;

			}

			return {
				dataSize: 4,
				buffer: buffer,
				indices: indexBuffer,
				mappingType: mappingType,
				referenceType: referenceType
			};

		},

		// Parse mapping and material data in FBXTree.Objects.Geometry.LayerElementMaterial if it exists
		parseMaterialIndices: function ( MaterialNode ) {

			var mappingType = MaterialNode.MappingInformationType;
			var referenceType = MaterialNode.ReferenceInformationType;

			if ( mappingType === 'NoMappingInformation' ) {

				return {
					dataSize: 1,
					buffer: [ 0 ],
					indices: [ 0 ],
					mappingType: 'AllSame',
					referenceType: referenceType
				};

			}

			var materialIndexBuffer = MaterialNode.Materials.a;

			// Since materials are stored as indices, there's a bit of a mismatch between FBX and what
			// we expect.So we create an intermediate buffer that points to the index in the buffer,
			// for conforming with the other functions we've written for other data.
			var materialIndices = [];

			for ( var i = 0; i < materialIndexBuffer.length; ++ i ) {

				materialIndices.push( i );

			}

			return {
				dataSize: 1,
				buffer: materialIndexBuffer,
				indices: materialIndices,
				mappingType: mappingType,
				referenceType: referenceType
			};

		},

		// Generate a NurbGeometry from a node in FBXTree.Objects.Geometry
		parseNurbsGeometry: function ( geoNode ) {

			if ( NURBSCurve === undefined ) {

				console.error( 'THREE.FBXLoader: The loader relies on NURBSCurve for any nurbs present in the model. Nurbs will show up as empty geometry.' );
				return new BufferGeometry();

			}

			var order = parseInt( geoNode.Order );

			if ( isNaN( order ) ) {

				console.error( 'THREE.FBXLoader: Invalid Order %s given for geometry ID: %s', geoNode.Order, geoNode.id );
				return new BufferGeometry();

			}

			var degree = order - 1;

			var knots = geoNode.KnotVector.a;
			var controlPoints = [];
			var pointsValues = geoNode.Points.a;

			for ( var i = 0, l = pointsValues.length; i < l; i += 4 ) {

				controlPoints.push( new Vector4().fromArray( pointsValues, i ) );

			}

			var startKnot, endKnot;

			if ( geoNode.Form === 'Closed' ) {

				controlPoints.push( controlPoints[ 0 ] );

			} else if ( geoNode.Form === 'Periodic' ) {

				startKnot = degree;
				endKnot = knots.length - 1 - startKnot;

				for ( var i = 0; i < degree; ++ i ) {

					controlPoints.push( controlPoints[ i ] );

				}

			}

			var curve = new NURBSCurve( degree, knots, controlPoints, startKnot, endKnot );
			var vertices = curve.getPoints( controlPoints.length * 7 );

			var positions = new Float32Array( vertices.length * 3 );

			vertices.forEach( function ( vertex, i ) {

				vertex.toArray( positions, i * 3 );

			} );

			var geometry = new BufferGeometry();
			geometry.setAttribute( 'position', new BufferAttribute( positions, 3 ) );

			return geometry;

		},

	};

	// parse animation data from FBXTree
	function AnimationParser() {}

	AnimationParser.prototype = {

		constructor: AnimationParser,

		// take raw animation clips and turn them into three.js animation clips
		parse: function () {

			var animationClips = [];

			var rawClips = this.parseClips();

			if ( rawClips !== undefined ) {

				for ( var key in rawClips ) {

					var rawClip = rawClips[ key ];

					var clip = this.addClip( rawClip );

					animationClips.push( clip );

				}

			}

			return animationClips;

		},

		parseClips: function () {

			// since the actual transformation data is stored in FBXTree.Objects.AnimationCurve,
			// if this is undefined we can safely assume there are no animations
			if ( fbxTree.Objects.AnimationCurve === undefined ) return undefined;

			var curveNodesMap = this.parseAnimationCurveNodes();

			this.parseAnimationCurves( curveNodesMap );

			var layersMap = this.parseAnimationLayers( curveNodesMap );
			var rawClips = this.parseAnimStacks( layersMap );

			return rawClips;

		},

		// parse nodes in FBXTree.Objects.AnimationCurveNode
		// each AnimationCurveNode holds data for an animation transform for a model (e.g. left arm rotation )
		// and is referenced by an AnimationLayer
		parseAnimationCurveNodes: function () {

			var rawCurveNodes = fbxTree.Objects.AnimationCurveNode;

			var curveNodesMap = new Map();

			for ( var nodeID in rawCurveNodes ) {

				var rawCurveNode = rawCurveNodes[ nodeID ];

				if ( rawCurveNode.attrName.match( /S|R|T|DeformPercent/ ) !== null ) {

					var curveNode = {

						id: rawCurveNode.id,
						attr: rawCurveNode.attrName,
						curves: {},

					};

					curveNodesMap.set( curveNode.id, curveNode );

				}

			}

			return curveNodesMap;

		},

		// parse nodes in FBXTree.Objects.AnimationCurve and connect them up to
		// previously parsed AnimationCurveNodes. Each AnimationCurve holds data for a single animated
		// axis ( e.g. times and values of x rotation)
		parseAnimationCurves: function ( curveNodesMap ) {

			var rawCurves = fbxTree.Objects.AnimationCurve;

			// TODO: Many values are identical up to roundoff error, but won't be optimised
			// e.g. position times: [0, 0.4, 0. 8]
			// position values: [7.23538335023477e-7, 93.67518615722656, -0.9982695579528809, 7.23538335023477e-7, 93.67518615722656, -0.9982695579528809, 7.235384487103147e-7, 93.67520904541016, -0.9982695579528809]
			// clearly, this should be optimised to
			// times: [0], positions [7.23538335023477e-7, 93.67518615722656, -0.9982695579528809]
			// this shows up in nearly every FBX file, and generally time array is length > 100

			for ( var nodeID in rawCurves ) {

				var animationCurve = {

					id: rawCurves[ nodeID ].id,
					times: rawCurves[ nodeID ].KeyTime.a.map( convertFBXTimeToSeconds ),
					values: rawCurves[ nodeID ].KeyValueFloat.a,

				};

				var relationships = connections.get( animationCurve.id );

				if ( relationships !== undefined ) {

					var animationCurveID = relationships.parents[ 0 ].ID;
					var animationCurveRelationship = relationships.parents[ 0 ].relationship;

					if ( animationCurveRelationship.match( /X/ ) ) {

						curveNodesMap.get( animationCurveID ).curves[ 'x' ] = animationCurve;

					} else if ( animationCurveRelationship.match( /Y/ ) ) {

						curveNodesMap.get( animationCurveID ).curves[ 'y' ] = animationCurve;

					} else if ( animationCurveRelationship.match( /Z/ ) ) {

						curveNodesMap.get( animationCurveID ).curves[ 'z' ] = animationCurve;

					} else if ( animationCurveRelationship.match( /d|DeformPercent/ ) && curveNodesMap.has( animationCurveID ) ) {

						curveNodesMap.get( animationCurveID ).curves[ 'morph' ] = animationCurve;

					}

				}

			}

		},

		// parse nodes in FBXTree.Objects.AnimationLayer. Each layers holds references
		// to various AnimationCurveNodes and is referenced by an AnimationStack node
		// note: theoretically a stack can have multiple layers, however in practice there always seems to be one per stack
		parseAnimationLayers: function ( curveNodesMap ) {

			var rawLayers = fbxTree.Objects.AnimationLayer;

			var layersMap = new Map();

			for ( var nodeID in rawLayers ) {

				var layerCurveNodes = [];

				var connection = connections.get( parseInt( nodeID ) );

				if ( connection !== undefined ) {

					// all the animationCurveNodes used in the layer
					var children = connection.children;

					children.forEach( function ( child, i ) {

						if ( curveNodesMap.has( child.ID ) ) {

							var curveNode = curveNodesMap.get( child.ID );

							// check that the curves are defined for at least one axis, otherwise ignore the curveNode
							if ( curveNode.curves.x !== undefined || curveNode.curves.y !== undefined || curveNode.curves.z !== undefined ) {

								if ( layerCurveNodes[ i ] === undefined ) {

									var modelID = connections.get( child.ID ).parents.filter( function ( parent ) {

										return parent.relationship !== undefined;

									} )[ 0 ].ID;

									if ( modelID !== undefined ) {

										var rawModel = fbxTree.Objects.Model[ modelID.toString() ];

										var node = {

											modelName: rawModel.attrName ? PropertyBinding.sanitizeNodeName( rawModel.attrName ) : '',
											ID: rawModel.id,
											initialPosition: [ 0, 0, 0 ],
											initialRotation: [ 0, 0, 0 ],
											initialScale: [ 1, 1, 1 ],

										};

										sceneGraph.traverse( function ( child ) {

											if ( child.ID === rawModel.id ) {

												node.transform = child.matrix;

												if ( child.userData.transformData ) node.eulerOrder = child.userData.transformData.eulerOrder;

											}

										} );

										if ( ! node.transform ) node.transform = new Matrix4();

										// if the animated model is pre rotated, we'll have to apply the pre rotations to every
										// animation value as well
										if ( 'PreRotation' in rawModel ) node.preRotation = rawModel.PreRotation.value;
										if ( 'PostRotation' in rawModel ) node.postRotation = rawModel.PostRotation.value;

										layerCurveNodes[ i ] = node;

									}

								}

								if ( layerCurveNodes[ i ] ) layerCurveNodes[ i ][ curveNode.attr ] = curveNode;

							} else if ( curveNode.curves.morph !== undefined ) {

								if ( layerCurveNodes[ i ] === undefined ) {

									var deformerID = connections.get( child.ID ).parents.filter( function ( parent ) {

										return parent.relationship !== undefined;

									} )[ 0 ].ID;

									var morpherID = connections.get( deformerID ).parents[ 0 ].ID;
									var geoID = connections.get( morpherID ).parents[ 0 ].ID;

									// assuming geometry is not used in more than one model
									var modelID = connections.get( geoID ).parents[ 0 ].ID;

									var rawModel = fbxTree.Objects.Model[ modelID ];

									var node = {

										modelName: rawModel.attrName ? PropertyBinding.sanitizeNodeName( rawModel.attrName ) : '',
										morphName: fbxTree.Objects.Deformer[ deformerID ].attrName,

									};

									layerCurveNodes[ i ] = node;

								}

								layerCurveNodes[ i ][ curveNode.attr ] = curveNode;

							}

						}

					} );

					layersMap.set( parseInt( nodeID ), layerCurveNodes );

				}

			}

			return layersMap;

		},

		// parse nodes in FBXTree.Objects.AnimationStack. These are the top level node in the animation
		// hierarchy. Each Stack node will be used to create a AnimationClip
		parseAnimStacks: function ( layersMap ) {

			var rawStacks = fbxTree.Objects.AnimationStack;

			// connect the stacks (clips) up to the layers
			var rawClips = {};

			for ( var nodeID in rawStacks ) {

				var children = connections.get( parseInt( nodeID ) ).children;

				if ( children.length > 1 ) {

					// it seems like stacks will always be associated with a single layer. But just in case there are files
					// where there are multiple layers per stack, we'll display a warning
					console.warn( 'THREE.FBXLoader: Encountered an animation stack with multiple layers, this is currently not supported. Ignoring subsequent layers.' );

				}

				var layer = layersMap.get( children[ 0 ].ID );

				rawClips[ nodeID ] = {

					name: rawStacks[ nodeID ].attrName,
					layer: layer,

				};

			}

			return rawClips;

		},

		addClip: function ( rawClip ) {

			var tracks = [];

			var scope = this;
			rawClip.layer.forEach( function ( rawTracks ) {

				tracks = tracks.concat( scope.generateTracks( rawTracks ) );

			} );

			return new AnimationClip( rawClip.name, - 1, tracks );

		},

		generateTracks: function ( rawTracks ) {

			var tracks = [];

			var initialPosition = new Vector3();
			var initialRotation = new Quaternion();
			var initialScale = new Vector3();

			if ( rawTracks.transform ) rawTracks.transform.decompose( initialPosition, initialRotation, initialScale );

			initialPosition = initialPosition.toArray();
			initialRotation = new Euler().setFromQuaternion( initialRotation, rawTracks.eulerOrder ).toArray();
			initialScale = initialScale.toArray();

			if ( rawTracks.T !== undefined && Object.keys( rawTracks.T.curves ).length > 0 ) {

				var positionTrack = this.generateVectorTrack( rawTracks.modelName, rawTracks.T.curves, initialPosition, 'position' );
				if ( positionTrack !== undefined ) tracks.push( positionTrack );

			}

			if ( rawTracks.R !== undefined && Object.keys( rawTracks.R.curves ).length > 0 ) {

				var rotationTrack = this.generateRotationTrack( rawTracks.modelName, rawTracks.R.curves, initialRotation, rawTracks.preRotation, rawTracks.postRotation, rawTracks.eulerOrder );
				if ( rotationTrack !== undefined ) tracks.push( rotationTrack );

			}

			if ( rawTracks.S !== undefined && Object.keys( rawTracks.S.curves ).length > 0 ) {

				var scaleTrack = this.generateVectorTrack( rawTracks.modelName, rawTracks.S.curves, initialScale, 'scale' );
				if ( scaleTrack !== undefined ) tracks.push( scaleTrack );

			}

			if ( rawTracks.DeformPercent !== undefined ) {

				var morphTrack = this.generateMorphTrack( rawTracks );
				if ( morphTrack !== undefined ) tracks.push( morphTrack );

			}

			return tracks;

		},

		generateVectorTrack: function ( modelName, curves, initialValue, type ) {

			var times = this.getTimesForAllAxes( curves );
			var values = this.getKeyframeTrackValues( times, curves, initialValue );

			return new VectorKeyframeTrack( modelName + '.' + type, times, values );

		},

		generateRotationTrack: function ( modelName, curves, initialValue, preRotation, postRotation, eulerOrder ) {

			if ( curves.x !== undefined ) {

				this.interpolateRotations( curves.x );
				curves.x.values = curves.x.values.map( MathUtils.degToRad );

			}

			if ( curves.y !== undefined ) {

				this.interpolateRotations( curves.y );
				curves.y.values = curves.y.values.map( MathUtils.degToRad );

			}

			if ( curves.z !== undefined ) {

				this.interpolateRotations( curves.z );
				curves.z.values = curves.z.values.map( MathUtils.degToRad );

			}

			var times = this.getTimesForAllAxes( curves );
			var values = this.getKeyframeTrackValues( times, curves, initialValue );

			if ( preRotation !== undefined ) {

				preRotation = preRotation.map( MathUtils.degToRad );
				preRotation.push( eulerOrder );

				preRotation = new Euler().fromArray( preRotation );
				preRotation = new Quaternion().setFromEuler( preRotation );

			}

			if ( postRotation !== undefined ) {

				postRotation = postRotation.map( MathUtils.degToRad );
				postRotation.push( eulerOrder );

				postRotation = new Euler().fromArray( postRotation );
				postRotation = new Quaternion().setFromEuler( postRotation ).inverse();

			}

			var quaternion = new Quaternion();
			var euler = new Euler();

			var quaternionValues = [];

			for ( var i = 0; i < values.length; i += 3 ) {

				euler.set( values[ i ], values[ i + 1 ], values[ i + 2 ], eulerOrder );

				quaternion.setFromEuler( euler );

				if ( preRotation !== undefined ) quaternion.premultiply( preRotation );
				if ( postRotation !== undefined ) quaternion.multiply( postRotation );

				quaternion.toArray( quaternionValues, ( i / 3 ) * 4 );

			}

			return new QuaternionKeyframeTrack( modelName + '.quaternion', times, quaternionValues );

		},

		generateMorphTrack: function ( rawTracks ) {

			var curves = rawTracks.DeformPercent.curves.morph;
			var values = curves.values.map( function ( val ) {

				return val / 100;

			} );

			var morphNum = sceneGraph.getObjectByName( rawTracks.modelName ).morphTargetDictionary[ rawTracks.morphName ];

			return new NumberKeyframeTrack( rawTracks.modelName + '.morphTargetInfluences[' + morphNum + ']', curves.times, values );

		},

		// For all animated objects, times are defined separately for each axis
		// Here we'll combine the times into one sorted array without duplicates
		getTimesForAllAxes: function ( curves ) {

			var times = [];

			// first join together the times for each axis, if defined
			if ( curves.x !== undefined ) times = times.concat( curves.x.times );
			if ( curves.y !== undefined ) times = times.concat( curves.y.times );
			if ( curves.z !== undefined ) times = times.concat( curves.z.times );

			// then sort them and remove duplicates
			times = times.sort( function ( a, b ) {

				return a - b;

			} ).filter( function ( elem, index, array ) {

				return array.indexOf( elem ) == index;

			} );

			return times;

		},

		getKeyframeTrackValues: function ( times, curves, initialValue ) {

			var prevValue = initialValue;

			var values = [];

			var xIndex = - 1;
			var yIndex = - 1;
			var zIndex = - 1;

			times.forEach( function ( time ) {

				if ( curves.x ) xIndex = curves.x.times.indexOf( time );
				if ( curves.y ) yIndex = curves.y.times.indexOf( time );
				if ( curves.z ) zIndex = curves.z.times.indexOf( time );

				// if there is an x value defined for this frame, use that
				if ( xIndex !== - 1 ) {

					var xValue = curves.x.values[ xIndex ];
					values.push( xValue );
					prevValue[ 0 ] = xValue;

				} else {

					// otherwise use the x value from the previous frame
					values.push( prevValue[ 0 ] );

				}

				if ( yIndex !== - 1 ) {

					var yValue = curves.y.values[ yIndex ];
					values.push( yValue );
					prevValue[ 1 ] = yValue;

				} else {

					values.push( prevValue[ 1 ] );

				}

				if ( zIndex !== - 1 ) {

					var zValue = curves.z.values[ zIndex ];
					values.push( zValue );
					prevValue[ 2 ] = zValue;

				} else {

					values.push( prevValue[ 2 ] );

				}

			} );

			return values;

		},

		// Rotations are defined as Euler angles which can have values  of any size
		// These will be converted to quaternions which don't support values greater than
		// PI, so we'll interpolate large rotations
		interpolateRotations: function ( curve ) {

			for ( var i = 1; i < curve.values.length; i ++ ) {

				var initialValue = curve.values[ i - 1 ];
				var valuesSpan = curve.values[ i ] - initialValue;

				var absoluteSpan = Math.abs( valuesSpan );

				if ( absoluteSpan >= 180 ) {

					var numSubIntervals = absoluteSpan / 180;

					var step = valuesSpan / numSubIntervals;
					var nextValue = initialValue + step;

					var initialTime = curve.times[ i - 1 ];
					var timeSpan = curve.times[ i ] - initialTime;
					var interval = timeSpan / numSubIntervals;
					var nextTime = initialTime + interval;

					var interpolatedTimes = [];
					var interpolatedValues = [];

					while ( nextTime < curve.times[ i ] ) {

						interpolatedTimes.push( nextTime );
						nextTime += interval;

						interpolatedValues.push( nextValue );
						nextValue += step;

					}

					curve.times = inject( curve.times, i, interpolatedTimes );
					curve.values = inject( curve.values, i, interpolatedValues );

				}

			}

		},

	};

	// parse an FBX file in ASCII format
	function TextParser() {}

	TextParser.prototype = {

		constructor: TextParser,

		getPrevNode: function () {

			return this.nodeStack[ this.currentIndent - 2 ];

		},

		getCurrentNode: function () {

			return this.nodeStack[ this.currentIndent - 1 ];

		},

		getCurrentProp: function () {

			return this.currentProp;

		},

		pushStack: function ( node ) {

			this.nodeStack.push( node );
			this.currentIndent += 1;

		},

		popStack: function () {

			this.nodeStack.pop();
			this.currentIndent -= 1;

		},

		setCurrentProp: function ( val, name ) {

			this.currentProp = val;
			this.currentPropName = name;

		},

		parse: function ( text ) {

			this.currentIndent = 0;

			this.allNodes = new FBXTree();
			this.nodeStack = [];
			this.currentProp = [];
			this.currentPropName = '';

			var scope = this;

			var split = text.split( /[\r\n]+/ );

			split.forEach( function ( line, i ) {

				var matchComment = line.match( /^[\s\t]*;/ );
				var matchEmpty = line.match( /^[\s\t]*$/ );

				if ( matchComment || matchEmpty ) return;

				var matchBeginning = line.match( '^\\t{' + scope.currentIndent + '}(\\w+):(.*){', '' );
				var matchProperty = line.match( '^\\t{' + ( scope.currentIndent ) + '}(\\w+):[\\s\\t\\r\\n](.*)' );
				var matchEnd = line.match( '^\\t{' + ( scope.currentIndent - 1 ) + '}}' );

				if ( matchBeginning ) {

					scope.parseNodeBegin( line, matchBeginning );

				} else if ( matchProperty ) {

					scope.parseNodeProperty( line, matchProperty, split[ ++ i ] );

				} else if ( matchEnd ) {

					scope.popStack();

				} else if ( line.match( /^[^\s\t}]/ ) ) {

					// large arrays are split over multiple lines terminated with a ',' character
					// if this is encountered the line needs to be joined to the previous line
					scope.parseNodePropertyContinued( line );

				}

			} );

			return this.allNodes;

		},

		parseNodeBegin: function ( line, property ) {

			var nodeName = property[ 1 ].trim().replace( /^"/, '' ).replace( /"$/, '' );

			var nodeAttrs = property[ 2 ].split( ',' ).map( function ( attr ) {

				return attr.trim().replace( /^"/, '' ).replace( /"$/, '' );

			} );

			var node = { name: nodeName };
			var attrs = this.parseNodeAttr( nodeAttrs );

			var currentNode = this.getCurrentNode();

			// a top node
			if ( this.currentIndent === 0 ) {

				this.allNodes.add( nodeName, node );

			} else { // a subnode

				// if the subnode already exists, append it
				if ( nodeName in currentNode ) {

					// special case Pose needs PoseNodes as an array
					if ( nodeName === 'PoseNode' ) {

						currentNode.PoseNode.push( node );

					} else if ( currentNode[ nodeName ].id !== undefined ) {

						currentNode[ nodeName ] = {};
						currentNode[ nodeName ][ currentNode[ nodeName ].id ] = currentNode[ nodeName ];

					}

					if ( attrs.id !== '' ) currentNode[ nodeName ][ attrs.id ] = node;

				} else if ( typeof attrs.id === 'number' ) {

					currentNode[ nodeName ] = {};
					currentNode[ nodeName ][ attrs.id ] = node;

				} else if ( nodeName !== 'Properties70' ) {

					if ( nodeName === 'PoseNode' )	currentNode[ nodeName ] = [ node ];
					else currentNode[ nodeName ] = node;

				}

			}

			if ( typeof attrs.id === 'number' ) node.id = attrs.id;
			if ( attrs.name !== '' ) node.attrName = attrs.name;
			if ( attrs.type !== '' ) node.attrType = attrs.type;

			this.pushStack( node );

		},

		parseNodeAttr: function ( attrs ) {

			var id = attrs[ 0 ];

			if ( attrs[ 0 ] !== '' ) {

				id = parseInt( attrs[ 0 ] );

				if ( isNaN( id ) ) {

					id = attrs[ 0 ];

				}

			}

			var name = '', type = '';

			if ( attrs.length > 1 ) {

				name = attrs[ 1 ].replace( /^(\w+)::/, '' );
				type = attrs[ 2 ];

			}

			return { id: id, name: name, type: type };

		},

		parseNodeProperty: function ( line, property, contentLine ) {

			var propName = property[ 1 ].replace( /^"/, '' ).replace( /"$/, '' ).trim();
			var propValue = property[ 2 ].replace( /^"/, '' ).replace( /"$/, '' ).trim();

			// for special case: base64 image data follows "Content: ," line
			//	Content: ,
			//	 "/9j/4RDaRXhpZgAATU0A..."
			if ( propName === 'Content' && propValue === ',' ) {

				propValue = contentLine.replace( /"/g, '' ).replace( /,$/, '' ).trim();

			}

			var currentNode = this.getCurrentNode();
			var parentName = currentNode.name;

			if ( parentName === 'Properties70' ) {

				this.parseNodeSpecialProperty( line, propName, propValue );
				return;

			}

			// Connections
			if ( propName === 'C' ) {

				var connProps = propValue.split( ',' ).slice( 1 );
				var from = parseInt( connProps[ 0 ] );
				var to = parseInt( connProps[ 1 ] );

				var rest = propValue.split( ',' ).slice( 3 );

				rest = rest.map( function ( elem ) {

					return elem.trim().replace( /^"/, '' );

				} );

				propName = 'connections';
				propValue = [ from, to ];
				append( propValue, rest );

				if ( currentNode[ propName ] === undefined ) {

					currentNode[ propName ] = [];

				}

			}

			// Node
			if ( propName === 'Node' ) currentNode.id = propValue;

			// connections
			if ( propName in currentNode && Array.isArray( currentNode[ propName ] ) ) {

				currentNode[ propName ].push( propValue );

			} else {

				if ( propName !== 'a' ) currentNode[ propName ] = propValue;
				else currentNode.a = propValue;

			}

			this.setCurrentProp( currentNode, propName );

			// convert string to array, unless it ends in ',' in which case more will be added to it
			if ( propName === 'a' && propValue.slice( - 1 ) !== ',' ) {

				currentNode.a = parseNumberArray( propValue );

			}

		},

		parseNodePropertyContinued: function ( line ) {

			var currentNode = this.getCurrentNode();

			currentNode.a += line;

			// if the line doesn't end in ',' we have reached the end of the property value
			// so convert the string to an array
			if ( line.slice( - 1 ) !== ',' ) {

				currentNode.a = parseNumberArray( currentNode.a );

			}

		},

		// parse "Property70"
		parseNodeSpecialProperty: function ( line, propName, propValue ) {

			// split this
			// P: "Lcl Scaling", "Lcl Scaling", "", "A",1,1,1
			// into array like below
			// ["Lcl Scaling", "Lcl Scaling", "", "A", "1,1,1" ]
			var props = propValue.split( '",' ).map( function ( prop ) {

				return prop.trim().replace( /^\"/, '' ).replace( /\s/, '_' );

			} );

			var innerPropName = props[ 0 ];
			var innerPropType1 = props[ 1 ];
			var innerPropType2 = props[ 2 ];
			var innerPropFlag = props[ 3 ];
			var innerPropValue = props[ 4 ];

			// cast values where needed, otherwise leave as strings
			switch ( innerPropType1 ) {

				case 'int':
				case 'enum':
				case 'bool':
				case 'ULongLong':
				case 'double':
				case 'Number':
				case 'FieldOfView':
					innerPropValue = parseFloat( innerPropValue );
					break;

				case 'Color':
				case 'ColorRGB':
				case 'Vector3D':
				case 'Lcl_Translation':
				case 'Lcl_Rotation':
				case 'Lcl_Scaling':
					innerPropValue = parseNumberArray( innerPropValue );
					break;

			}

			// CAUTION: these props must append to parent's parent
			this.getPrevNode()[ innerPropName ] = {

				'type': innerPropType1,
				'type2': innerPropType2,
				'flag': innerPropFlag,
				'value': innerPropValue

			};

			this.setCurrentProp( this.getPrevNode(), innerPropName );

		},

	};

	// Parse an FBX file in Binary format
	function BinaryParser() {}

	BinaryParser.prototype = {

		constructor: BinaryParser,

		parse: function ( buffer ) {

			var reader = new BinaryReader( buffer );
			reader.skip( 23 ); // skip magic 23 bytes

			var version = reader.getUint32();

			console.log( 'THREE.FBXLoader: FBX binary version: ' + version );

			var allNodes = new FBXTree();

			while ( ! this.endOfContent( reader ) ) {

				var node = this.parseNode( reader, version );
				if ( node !== null ) allNodes.add( node.name, node );

			}

			return allNodes;

		},

		// Check if reader has reached the end of content.
		endOfContent: function ( reader ) {

			// footer size: 160bytes + 16-byte alignment padding
			// - 16bytes: magic
			// - padding til 16-byte alignment (at least 1byte?)
			//	(seems like some exporters embed fixed 15 or 16bytes?)
			// - 4bytes: magic
			// - 4bytes: version
			// - 120bytes: zero
			// - 16bytes: magic
			if ( reader.size() % 16 === 0 ) {

				return ( ( reader.getOffset() + 160 + 16 ) & ~ 0xf ) >= reader.size();

			} else {

				return reader.getOffset() + 160 + 16 >= reader.size();

			}

		},

		// recursively parse nodes until the end of the file is reached
		parseNode: function ( reader, version ) {

			var node = {};

			// The first three data sizes depends on version.
			var endOffset = ( version >= 7500 ) ? reader.getUint64() : reader.getUint32();
			var numProperties = ( version >= 7500 ) ? reader.getUint64() : reader.getUint32();

			( version >= 7500 ) ? reader.getUint64() : reader.getUint32(); // the returned propertyListLen is not used

			var nameLen = reader.getUint8();
			var name = reader.getString( nameLen );

			// Regards this node as NULL-record if endOffset is zero
			if ( endOffset === 0 ) return null;

			var propertyList = [];

			for ( var i = 0; i < numProperties; i ++ ) {

				propertyList.push( this.parseProperty( reader ) );

			}

			// Regards the first three elements in propertyList as id, attrName, and attrType
			var id = propertyList.length > 0 ? propertyList[ 0 ] : '';
			var attrName = propertyList.length > 1 ? propertyList[ 1 ] : '';
			var attrType = propertyList.length > 2 ? propertyList[ 2 ] : '';

			// check if this node represents just a single property
			// like (name, 0) set or (name2, [0, 1, 2]) set of {name: 0, name2: [0, 1, 2]}
			node.singleProperty = ( numProperties === 1 && reader.getOffset() === endOffset ) ? true : false;

			while ( endOffset > reader.getOffset() ) {

				var subNode = this.parseNode( reader, version );

				if ( subNode !== null ) this.parseSubNode( name, node, subNode );

			}

			node.propertyList = propertyList; // raw property list used by parent

			if ( typeof id === 'number' ) node.id = id;
			if ( attrName !== '' ) node.attrName = attrName;
			if ( attrType !== '' ) node.attrType = attrType;
			if ( name !== '' ) node.name = name;

			return node;

		},

		parseSubNode: function ( name, node, subNode ) {

			// special case: child node is single property
			if ( subNode.singleProperty === true ) {

				var value = subNode.propertyList[ 0 ];

				if ( Array.isArray( value ) ) {

					node[ subNode.name ] = subNode;

					subNode.a = value;

				} else {

					node[ subNode.name ] = value;

				}

			} else if ( name === 'Connections' && subNode.name === 'C' ) {

				var array = [];

				subNode.propertyList.forEach( function ( property, i ) {

					// first Connection is FBX type (OO, OP, etc.). We'll discard these
					if ( i !== 0 ) array.push( property );

				} );

				if ( node.connections === undefined ) {

					node.connections = [];

				}

				node.connections.push( array );

			} else if ( subNode.name === 'Properties70' ) {

				var keys = Object.keys( subNode );

				keys.forEach( function ( key ) {

					node[ key ] = subNode[ key ];

				} );

			} else if ( name === 'Properties70' && subNode.name === 'P' ) {

				var innerPropName = subNode.propertyList[ 0 ];
				var innerPropType1 = subNode.propertyList[ 1 ];
				var innerPropType2 = subNode.propertyList[ 2 ];
				var innerPropFlag = subNode.propertyList[ 3 ];
				var innerPropValue;

				if ( innerPropName.indexOf( 'Lcl ' ) === 0 ) innerPropName = innerPropName.replace( 'Lcl ', 'Lcl_' );
				if ( innerPropType1.indexOf( 'Lcl ' ) === 0 ) innerPropType1 = innerPropType1.replace( 'Lcl ', 'Lcl_' );

				if ( innerPropType1 === 'Color' || innerPropType1 === 'ColorRGB' || innerPropType1 === 'Vector' || innerPropType1 === 'Vector3D' || innerPropType1.indexOf( 'Lcl_' ) === 0 ) {

					innerPropValue = [
						subNode.propertyList[ 4 ],
						subNode.propertyList[ 5 ],
						subNode.propertyList[ 6 ]
					];

				} else {

					innerPropValue = subNode.propertyList[ 4 ];

				}

				// this will be copied to parent, see above
				node[ innerPropName ] = {

					'type': innerPropType1,
					'type2': innerPropType2,
					'flag': innerPropFlag,
					'value': innerPropValue

				};

			} else if ( node[ subNode.name ] === undefined ) {

				if ( typeof subNode.id === 'number' ) {

					node[ subNode.name ] = {};
					node[ subNode.name ][ subNode.id ] = subNode;

				} else {

					node[ subNode.name ] = subNode;

				}

			} else {

				if ( subNode.name === 'PoseNode' ) {

					if ( ! Array.isArray( node[ subNode.name ] ) ) {

						node[ subNode.name ] = [ node[ subNode.name ] ];

					}

					node[ subNode.name ].push( subNode );

				} else if ( node[ subNode.name ][ subNode.id ] === undefined ) {

					node[ subNode.name ][ subNode.id ] = subNode;

				}

			}

		},

		parseProperty: function ( reader ) {

			var type = reader.getString( 1 );

			switch ( type ) {

				case 'C':
					return reader.getBoolean();

				case 'D':
					return reader.getFloat64();

				case 'F':
					return reader.getFloat32();

				case 'I':
					return reader.getInt32();

				case 'L':
					return reader.getInt64();

				case 'R':
					var length = reader.getUint32();
					return reader.getArrayBuffer( length );

				case 'S':
					var length = reader.getUint32();
					return reader.getString( length );

				case 'Y':
					return reader.getInt16();

				case 'b':
				case 'c':
				case 'd':
				case 'f':
				case 'i':
				case 'l':

					var arrayLength = reader.getUint32();
					var encoding = reader.getUint32(); // 0: non-compressed, 1: compressed
					var compressedLength = reader.getUint32();

					if ( encoding === 0 ) {

						switch ( type ) {

							case 'b':
							case 'c':
								return reader.getBooleanArray( arrayLength );

							case 'd':
								return reader.getFloat64Array( arrayLength );

							case 'f':
								return reader.getFloat32Array( arrayLength );

							case 'i':
								return reader.getInt32Array( arrayLength );

							case 'l':
								return reader.getInt64Array( arrayLength );

						}

					}

					if ( typeof Zlib === 'undefined' ) {

						console.error( 'THREE.FBXLoader: External library Inflate.min.js required, obtain or import from https://github.com/imaya/zlib.js' );

					}

					var inflate = new Zlib.Inflate( new Uint8Array( reader.getArrayBuffer( compressedLength ) ) ); // eslint-disable-line no-undef
					var reader2 = new BinaryReader( inflate.decompress().buffer );

					switch ( type ) {

						case 'b':
						case 'c':
							return reader2.getBooleanArray( arrayLength );

						case 'd':
							return reader2.getFloat64Array( arrayLength );

						case 'f':
							return reader2.getFloat32Array( arrayLength );

						case 'i':
							return reader2.getInt32Array( arrayLength );

						case 'l':
							return reader2.getInt64Array( arrayLength );

					}

				default:
					throw new Error( 'THREE.FBXLoader: Unknown property type ' + type );

			}

		}

	};

	function BinaryReader( buffer, littleEndian ) {

		this.dv = new DataView( buffer );
		this.offset = 0;
		this.littleEndian = ( littleEndian !== undefined ) ? littleEndian : true;

	}

	BinaryReader.prototype = {

		constructor: BinaryReader,

		getOffset: function () {

			return this.offset;

		},

		size: function () {

			return this.dv.buffer.byteLength;

		},

		skip: function ( length ) {

			this.offset += length;

		},

		// seems like true/false representation depends on exporter.
		// true: 1 or 'Y'(=0x59), false: 0 or 'T'(=0x54)
		// then sees LSB.
		getBoolean: function () {

			return ( this.getUint8() & 1 ) === 1;

		},

		getBooleanArray: function ( size ) {

			var a = [];

			for ( var i = 0; i < size; i ++ ) {

				a.push( this.getBoolean() );

			}

			return a;

		},

		getUint8: function () {

			var value = this.dv.getUint8( this.offset );
			this.offset += 1;
			return value;

		},

		getInt16: function () {

			var value = this.dv.getInt16( this.offset, this.littleEndian );
			this.offset += 2;
			return value;

		},

		getInt32: function () {

			var value = this.dv.getInt32( this.offset, this.littleEndian );
			this.offset += 4;
			return value;

		},

		getInt32Array: function ( size ) {

			var a = [];

			for ( var i = 0; i < size; i ++ ) {

				a.push( this.getInt32() );

			}

			return a;

		},

		getUint32: function () {

			var value = this.dv.getUint32( this.offset, this.littleEndian );
			this.offset += 4;
			return value;

		},

		// JavaScript doesn't support 64-bit integer so calculate this here
		// 1 << 32 will return 1 so using multiply operation instead here.
		// There's a possibility that this method returns wrong value if the value
		// is out of the range between Number.MAX_SAFE_INTEGER and Number.MIN_SAFE_INTEGER.
		// TODO: safely handle 64-bit integer
		getInt64: function () {

			var low, high;

			if ( this.littleEndian ) {

				low = this.getUint32();
				high = this.getUint32();

			} else {

				high = this.getUint32();
				low = this.getUint32();

			}

			// calculate negative value
			if ( high & 0x80000000 ) {

				high = ~ high & 0xFFFFFFFF;
				low = ~ low & 0xFFFFFFFF;

				if ( low === 0xFFFFFFFF ) high = ( high + 1 ) & 0xFFFFFFFF;

				low = ( low + 1 ) & 0xFFFFFFFF;

				return - ( high * 0x100000000 + low );

			}

			return high * 0x100000000 + low;

		},

		getInt64Array: function ( size ) {

			var a = [];

			for ( var i = 0; i < size; i ++ ) {

				a.push( this.getInt64() );

			}

			return a;

		},

		// Note: see getInt64() comment
		getUint64: function () {

			var low, high;

			if ( this.littleEndian ) {

				low = this.getUint32();
				high = this.getUint32();

			} else {

				high = this.getUint32();
				low = this.getUint32();

			}

			return high * 0x100000000 + low;

		},

		getFloat32: function () {

			var value = this.dv.getFloat32( this.offset, this.littleEndian );
			this.offset += 4;
			return value;

		},

		getFloat32Array: function ( size ) {

			var a = [];

			for ( var i = 0; i < size; i ++ ) {

				a.push( this.getFloat32() );

			}

			return a;

		},

		getFloat64: function () {

			var value = this.dv.getFloat64( this.offset, this.littleEndian );
			this.offset += 8;
			return value;

		},

		getFloat64Array: function ( size ) {

			var a = [];

			for ( var i = 0; i < size; i ++ ) {

				a.push( this.getFloat64() );

			}

			return a;

		},

		getArrayBuffer: function ( size ) {

			var value = this.dv.buffer.slice( this.offset, this.offset + size );
			this.offset += size;
			return value;

		},

		getString: function ( size ) {

			// note: safari 9 doesn't support Uint8Array.indexOf; create intermediate array instead
			var a = [];

			for ( var i = 0; i < size; i ++ ) {

				a[ i ] = this.getUint8();

			}

			var nullByte = a.indexOf( 0 );
			if ( nullByte >= 0 ) a = a.slice( 0, nullByte );

			return LoaderUtils.decodeText( new Uint8Array( a ) );

		}

	};

	// FBXTree holds a representation of the FBX data, returned by the TextParser ( FBX ASCII format)
	// and BinaryParser( FBX Binary format)
	function FBXTree() {}

	FBXTree.prototype = {

		constructor: FBXTree,

		add: function ( key, val ) {

			this[ key ] = val;

		},

	};

	// ************** UTILITY FUNCTIONS **************

	function isFbxFormatBinary( buffer ) {

		var CORRECT = 'Kaydara FBX Binary  \0';

		return buffer.byteLength >= CORRECT.length && CORRECT === convertArrayBufferToString( buffer, 0, CORRECT.length );

	}

	function isFbxFormatASCII( text ) {

		var CORRECT = [ 'K', 'a', 'y', 'd', 'a', 'r', 'a', '\\', 'F', 'B', 'X', '\\', 'B', 'i', 'n', 'a', 'r', 'y', '\\', '\\' ];

		var cursor = 0;

		function read( offset ) {

			var result = text[ offset - 1 ];
			text = text.slice( cursor + offset );
			cursor ++;
			return result;

		}

		for ( var i = 0; i < CORRECT.length; ++ i ) {

			var num = read( 1 );
			if ( num === CORRECT[ i ] ) {

				return false;

			}

		}

		return true;

	}

	function getFbxVersion( text ) {

		var versionRegExp = /FBXVersion: (\d+)/;
		var match = text.match( versionRegExp );

		if ( match ) {

			var version = parseInt( match[ 1 ] );
			return version;

		}

		throw new Error( 'THREE.FBXLoader: Cannot find the version number for the file given.' );

	}

	// Converts FBX ticks into real time seconds.
	function convertFBXTimeToSeconds( time ) {

		return time / 46186158000;

	}

	var dataArray = [];

	// extracts the data from the correct position in the FBX array based on indexing type
	function getData( polygonVertexIndex, polygonIndex, vertexIndex, infoObject ) {

		var index;

		switch ( infoObject.mappingType ) {

			case 'ByPolygonVertex' :
				index = polygonVertexIndex;
				break;
			case 'ByPolygon' :
				index = polygonIndex;
				break;
			case 'ByVertice' :
				index = vertexIndex;
				break;
			case 'AllSame' :
				index = infoObject.indices[ 0 ];
				break;
			default :
				console.warn( 'THREE.FBXLoader: unknown attribute mapping type ' + infoObject.mappingType );

		}

		if ( infoObject.referenceType === 'IndexToDirect' ) index = infoObject.indices[ index ];

		var from = index * infoObject.dataSize;
		var to = from + infoObject.dataSize;

		return slice( dataArray, infoObject.buffer, from, to );

	}

	var tempEuler = new Euler();
	var tempVec = new Vector3();

	// generate transformation from FBX transform data
	// ref: https://help.autodesk.com/view/FBX/2017/ENU/?guid=__files_GUID_10CDD63C_79C1_4F2D_BB28_AD2BE65A02ED_htm
	// ref: http://docs.autodesk.com/FBX/2014/ENU/FBX-SDK-Documentation/index.html?url=cpp_ref/_transformations_2main_8cxx-example.html,topicNumber=cpp_ref__transformations_2main_8cxx_example_htmlfc10a1e1-b18d-4e72-9dc0-70d0f1959f5e
	function generateTransform( transformData ) {

		var lTranslationM = new Matrix4();
		var lPreRotationM = new Matrix4();
		var lRotationM = new Matrix4();
		var lPostRotationM = new Matrix4();

		var lScalingM = new Matrix4();
		var lScalingPivotM = new Matrix4();
		var lScalingOffsetM = new Matrix4();
		var lRotationOffsetM = new Matrix4();
		var lRotationPivotM = new Matrix4();

		var lParentGX = new Matrix4();
		var lGlobalT = new Matrix4();

		var inheritType = ( transformData.inheritType ) ? transformData.inheritType : 0;

		if ( transformData.translation ) lTranslationM.setPosition( tempVec.fromArray( transformData.translation ) );

		if ( transformData.preRotation ) {

			var array = transformData.preRotation.map( MathUtils.degToRad );
			array.push( transformData.eulerOrder );
			lPreRotationM.makeRotationFromEuler( tempEuler.fromArray( array ) );

		}

		if ( transformData.rotation ) {

			var array = transformData.rotation.map( MathUtils.degToRad );
			array.push( transformData.eulerOrder );
			lRotationM.makeRotationFromEuler( tempEuler.fromArray( array ) );

		}

		if ( transformData.postRotation ) {

			var array = transformData.postRotation.map( MathUtils.degToRad );
			array.push( transformData.eulerOrder );
			lPostRotationM.makeRotationFromEuler( tempEuler.fromArray( array ) );

		}

		if ( transformData.scale ) lScalingM.scale( tempVec.fromArray( transformData.scale ) );

		// Pivots and offsets
		if ( transformData.scalingOffset ) lScalingOffsetM.setPosition( tempVec.fromArray( transformData.scalingOffset ) );
		if ( transformData.scalingPivot ) lScalingPivotM.setPosition( tempVec.fromArray( transformData.scalingPivot ) );
		if ( transformData.rotationOffset ) lRotationOffsetM.setPosition( tempVec.fromArray( transformData.rotationOffset ) );
		if ( transformData.rotationPivot ) lRotationPivotM.setPosition( tempVec.fromArray( transformData.rotationPivot ) );

		// parent transform
		if ( transformData.parentMatrixWorld ) lParentGX = transformData.parentMatrixWorld;

		// Global Rotation
		var lLRM = lPreRotationM.multiply( lRotationM ).multiply( lPostRotationM );
		var lParentGRM = new Matrix4();
		lParentGX.extractRotation( lParentGRM );

		// Global Shear*Scaling
		var lParentTM = new Matrix4();
		lParentTM.copyPosition( lParentGX );

		var lParentGSM = new Matrix4();
		lParentGSM.getInverse( lParentGRM ).multiply( lParentGX );

		var lGlobalRS = new Matrix4();

		if ( inheritType === 0 ) {

			lGlobalRS.copy( lParentGRM ).multiply( lLRM ).multiply( lParentGSM ).multiply( lScalingM );

		} else if ( inheritType === 1 ) {

			lGlobalRS.copy( lParentGRM ).multiply( lParentGSM ).multiply( lLRM ).multiply( lScalingM );

		} else {

			var lParentLSM_inv = new Matrix4().getInverse( lScalingM );
			var lParentGSM_noLocal = new Matrix4().multiply( lParentGSM ).multiply( lParentLSM_inv );

			lGlobalRS.copy( lParentGRM ).multiply( lLRM ).multiply( lParentGSM_noLocal ).multiply( lScalingM );

		}

		var lRotationPivotM_inv = new Matrix4().getInverse( lRotationPivotM );
		var lScalingPivotM_inv = new Matrix4().getInverse( lScalingPivotM );
		// Calculate the local transform matrix
		var lTransform = new Matrix4();
		lTransform.copy( lTranslationM ).multiply( lRotationOffsetM ).multiply( lRotationPivotM ).multiply( lPreRotationM ).multiply( lRotationM ).multiply( lPostRotationM ).multiply( lRotationPivotM_inv ).multiply( lScalingOffsetM ).multiply( lScalingPivotM ).multiply( lScalingM ).multiply( lScalingPivotM_inv );

		var lLocalTWithAllPivotAndOffsetInfo = new Matrix4().copyPosition( lTransform );

		var lGlobalTranslation = new Matrix4().copy( lParentGX ).multiply( lLocalTWithAllPivotAndOffsetInfo );
		lGlobalT.copyPosition( lGlobalTranslation );

		lTransform = new Matrix4().multiply( lGlobalT ).multiply( lGlobalRS );

		return lTransform;

	}

	// Returns the three.js intrinsic Euler order corresponding to FBX extrinsic Euler order
	// ref: http://help.autodesk.com/view/FBX/2017/ENU/?guid=__cpp_ref_class_fbx_euler_html
	function getEulerOrder( order ) {

		order = order || 0;

		var enums = [
			'ZYX', // -> XYZ extrinsic
			'YZX', // -> XZY extrinsic
			'XZY', // -> YZX extrinsic
			'ZXY', // -> YXZ extrinsic
			'YXZ', // -> ZXY extrinsic
			'XYZ', // -> ZYX extrinsic
			//'SphericXYZ', // not possible to support
		];

		if ( order === 6 ) {

			console.warn( 'THREE.FBXLoader: unsupported Euler Order: Spherical XYZ. Animations and rotations may be incorrect.' );
			return enums[ 0 ];

		}

		return enums[ order ];

	}

	// Parses comma separated list of numbers and returns them an array.
	// Used internally by the TextParser
	function parseNumberArray( value ) {

		var array = value.split( ',' ).map( function ( val ) {

			return parseFloat( val );

		} );

		return array;

	}

	function convertArrayBufferToString( buffer, from, to ) {

		if ( from === undefined ) from = 0;
		if ( to === undefined ) to = buffer.byteLength;

		return LoaderUtils.decodeText( new Uint8Array( buffer, from, to ) );

	}

	function append( a, b ) {

		for ( var i = 0, j = a.length, l = b.length; i < l; i ++, j ++ ) {

			a[ j ] = b[ i ];

		}

	}

	function slice( a, b, from, to ) {

		for ( var i = from, j = 0; i < to; i ++, j ++ ) {

			a[ j ] = b[ i ];

		}

		return a;

	}

	// inject array a2 into array a1 at index
	function inject( a1, index, a2 ) {

		return a1.slice( 0, index ).concat( a2 ).concat( a1.slice( index ) );

	}

	return FBXLoader;

} )()