three#CanvasTexture JavaScript Examples

function makeBackgroundTexture() {

	if ( !defaultBgTexture ) {

		const ctx = document.createElement( 'canvas' ).getContext( '2d' );
		ctx.canvas.width = 1;
		ctx.canvas.height = 1;
		ctx.fillStyle = '#ffffff';
		ctx.fillRect( 0, 0, 1, 1 );
		defaultBgTexture = new CanvasTexture( ctx.canvas );
		defaultBgTexture.isDefault = true;

	}

	return defaultBgTexture;

}

constructor (game) {
    this.game = game

    this.atlasCreator = new TextureAtlasCreator({
      textureX: this.game.al.get('blocksAtlasFull'),
      textureMapping: this.game.al.get('blocksMappingFull')
    })
    const canvas = this.atlasCreator.gen(0)
    const texture = new CanvasTexture(canvas)
    texture.magFilter = NearestFilter
    texture.minFilter = NearestMipmapLinearFilter

    this.material = new MeshStandardMaterial({
      side: 0,
      map: texture,
      vertexColors: true,
      transparent: true,
      alphaTest: 0.1
    })
  }

/**
	 * Constructs an item.
	 *
	 * @param model
	 *            TODO
	 * @param metadata
	 *            TODO
	 * @param geometry
	 *            TODO
	 * @param material
	 *            TODO
	 * @param position
	 *            TODO
	 * @param rotation
	 *            TODO
	 * @param scale
	 *            TODO
	 */
	constructor(model, metadata, geometry, material, position, rotation, scale, isgltf=false)
	{
		super();

		this.model = model;
		this.metadata = metadata;

		/** */
		this.errorGlow = new Mesh();
		/** */
		this.hover = false;
		/** */
		this.selected = false;
		/** */
		this.highlighted = false;
		/** */
		this.error = false;
		/** */
		this.emissiveColor = 0x444444;
		/** Does this object affect other floor items */
		this.obstructFloorMoves = true;
		/** */
		this.position_set = false;
		/** Show rotate option in context menu */
		this.allowRotate = true;
		/** */
		this.fixed = false;
		/** dragging */
		this.dragOffset = new Vector3();
		/** */
		this.halfSize = new Vector3(0,0,0);
		this.bhelper = null;

		this.scene = this.model.scene;
		this._freePosition = true;

		if(!isgltf)
		{
				this.geometry = geometry;
				this.material = material;
				// center in its boundingbox
				this.geometry.computeBoundingBox();
				this.geometry.applyMatrix(new Matrix4().makeTranslation(- 0.5 * (this.geometry.boundingBox.max.x + this.geometry.boundingBox.min.x),- 0.5 * (this.geometry.boundingBox.max.y + this.geometry.boundingBox.min.y),- 0.5 * (this.geometry.boundingBox.max.z + this.geometry.boundingBox.min.z)));
				this.geometry.computeBoundingBox();
		}
		else
		{
				var objectBox = new Box3();
				objectBox.setFromObject(geometry);
				var hsize = objectBox.max.clone().sub(objectBox.min).multiplyScalar(0.5);
				this.geometry = new BoxGeometry(hsize.x*0.5, hsize.y*0.5, hsize.z*0.5);
				this.material =  new MeshStandardMaterial({color: 0x000000, wireframe: true, visible:false});
				this.geometry.computeBoundingBox();
				this.add(geometry);
		}

		if(!this.material.color)
		{
			this.material.color = new Color('#FFFFFF');
		}
		this.wirematerial = new MeshBasicMaterial({color: 0x000000, wireframe: true});

		this.errorColor = 0xff0000;

		this.resizable = metadata.resizable;

		this.castShadow = true;
		this.receiveShadow = false;

		this.originalmaterial = material;
		this.texture = this.material.texture;

		this.position_set = false;
		if (position)
		{
			this.position.copy(position);
			this.position_set = true;
		}

		this.halfSize = this.objectHalfSize();
		this.canvasWH = document.createElement('canvas');
		this.canvasWH.width = this.getWidth()+1.0;
		this.canvasWH.height = this.getHeight()+1.0;

		this.canvascontextWH = this.canvasWH.getContext('2d');
		this.canvasTextureWH = new CanvasTexture(this.canvasWH);
		this.canvasMaterialWH = new MeshBasicMaterial({map:this.canvasTextureWH, side: DoubleSide, transparent:true});
		this.canvasPlaneWH = new Mesh(new PlaneGeometry(this.getWidth(), this.getHeight(), 1, 1), this.canvasMaterialWH);
		this.canvasPlaneWH.scale.set(1, 1, 1);
		this.canvasPlaneWH.position.set(0, 0, this.getDepth()*0.5 + 0.3);

		this.canvasWD = document.createElement('canvas');
		this.canvasWD.width = this.getWidth()+1.0;
		this.canvasWD.height = this.getDepth()+1.0;

		this.canvascontextWD = this.canvasWD.getContext('2d');
		this.canvasTextureWD = new CanvasTexture(this.canvasWD);
		this.canvasMaterialWD = new MeshBasicMaterial({map:this.canvasTextureWD, side: DoubleSide, transparent:true});
		this.canvasPlaneWD = new Mesh(new PlaneGeometry(this.getWidth(), this.getDepth(), 1, 1), this.canvasMaterialWD);
		this.canvasPlaneWD.rotateX(-Math.PI * 0.5);
		this.canvasPlaneWD.scale.set(1, 1, 1);
		this.canvasPlaneWD.position.set(0, this.getHeight()*0.5 + 0.3, 0);
		this.canvasPlaneWH.visible = this.canvasPlaneWD.visible = false;

    this.add(this.canvasPlaneWH);
		this.add(this.canvasPlaneWD);
		this.resizeProportionally = true;

		if (rotation)
		{
			this.rotation.y = rotation;
		}

		if (scale != null)
		{
			this.setScale(scale.x, scale.y, scale.z);
		}

		if(this.metadata.materialColors)
		{
			if(this.metadata.materialColors.length)
			{
				if(this.material.length)
				{
					for (var i=0;i<this.metadata.materialColors.length;i++)
					{
						this.material[i].color = new Color(this.metadata.materialColors[i]);
					}
				}
				else
				{
					this.material.color = new Color(this.metadata.materialColors[0]);
				}
			}
		}
	}