three#TOUCH JavaScript Examples

MapControls = function (object, domElement) {
  OrbitControls.call(this, object, domElement);

  this.mouseButtons.LEFT = MOUSE.PAN;
  this.mouseButtons.RIGHT = MOUSE.ROTATE;

  this.touches.ONE = TOUCH.PAN;
  this.touches.TWO = TOUCH.DOLLY_ROTATE;
}

MapControls = function ( object, domElement ) {

	OrbitControls.call( this, object, domElement );

	this.mouseButtons.LEFT = MOUSE.PAN;
	this.mouseButtons.RIGHT = MOUSE.ROTATE;

	this.touches.ONE = TOUCH.PAN;
	this.touches.TWO = TOUCH.DOLLY_ROTATE;

}

MapControls = function (object, domElement) {
    OrbitControls.call(this, object, domElement);

    this.mouseButtons.LEFT = MOUSE.PAN;
    this.mouseButtons.RIGHT = MOUSE.ROTATE;

    this.touches.ONE = TOUCH.PAN;
    this.touches.TWO = TOUCH.DOLLY_ROTATE;
}

MapControls = function ( object, domElement ) {

	OrbitControls.call( this, object, domElement );

	this.mouseButtons.LEFT = MOUSE.PAN;
	this.mouseButtons.RIGHT = MOUSE.ROTATE;

	this.touches.ONE = TOUCH.PAN;
	this.touches.TWO = TOUCH.DOLLY_ROTATE;

}

MapControls = function ( object, domElement ) {

	OrbitControls.call( this, object, domElement );

	this.mouseButtons.LEFT = MOUSE.PAN;
	this.mouseButtons.RIGHT = MOUSE.ROTATE;

	this.touches.ONE = TOUCH.PAN;
	this.touches.TWO = TOUCH.DOLLY_ROTATE;

}

OrbitControls = function (object, domElement) {
  if (domElement === undefined)
    console.warn(
      'THREE.OrbitControls: The second parameter "domElement" is now mandatory.'
    );
  if (domElement === document)
    console.error(
      'THREE.OrbitControls: "document" should not be used as the target "domElement". Please use "renderer.domElement" instead.'
    );

  this.object = object;
  this.domElement = domElement;

  // Set to false to disable this control
  this.enabled = true;

  // "target" sets the location of focus, where the object orbits around
  this.target = new Vector3();

  // How far you can dolly in and out ( PerspectiveCamera only )
  this.minDistance = 0;
  this.maxDistance = Infinity;

  // How far you can zoom in and out ( OrthographicCamera only )
  this.minZoom = 0;
  this.maxZoom = Infinity;

  // How far you can orbit vertically, upper and lower limits.
  // Range is 0 to Math.PI radians.
  this.minPolarAngle = 0; // radians
  this.maxPolarAngle = Math.PI; // radians

  // How far you can orbit horizontally, upper and lower limits.
  // If set, must be a sub-interval of the interval [ - Math.PI, Math.PI ].
  this.minAzimuthAngle = -Infinity; // radians
  this.maxAzimuthAngle = Infinity; // radians

  // Set to true to enable damping (inertia)
  // If damping is enabled, you must call controls.update() in your animation loop
  this.enableDamping = false;
  this.dampingFactor = 0.05;

  // This option actually enables dollying in and out; left as "zoom" for backwards compatibility.
  // Set to false to disable zooming
  this.enableZoom = true;
  this.zoomSpeed = 1.0;

  // Set to false to disable rotating
  this.enableRotate = true;
  this.rotateSpeed = 1.0;

  // Set to false to disable panning
  this.enablePan = true;
  this.panSpeed = 1.0;
  this.screenSpacePanning = false; // if true, pan in screen-space
  this.keyPanSpeed = 7.0; // pixels moved per arrow key push

  // Set to true to automatically rotate around the target
  // If auto-rotate is enabled, you must call controls.update() in your animation loop
  this.autoRotate = false;
  this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60

  // Set to false to disable use of the keys
  this.enableKeys = true;

  // The four arrow keys
  this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 };

  // Mouse buttons
  this.mouseButtons = {
    LEFT: MOUSE.ROTATE,
    MIDDLE: MOUSE.DOLLY,
    RIGHT: MOUSE.PAN,
  };

  // Touch fingers
  this.touches = { ONE: TOUCH.ROTATE, TWO: TOUCH.DOLLY_PAN };

  // for reset
  this.target0 = this.target.clone();
  this.position0 = this.object.position.clone();
  this.zoom0 = this.object.zoom;

  //
  // public methods
  //

  this.getPolarAngle = function () {
    return spherical.phi;
  };

  this.getAzimuthalAngle = function () {
    return spherical.theta;
  };

  this.saveState = function () {
    scope.target0.copy(scope.target);
    scope.position0.copy(scope.object.position);
    scope.zoom0 = scope.object.zoom;
  };

  this.reset = function () {
    scope.target.copy(scope.target0);
    scope.object.position.copy(scope.position0);
    scope.object.zoom = scope.zoom0;

    scope.object.updateProjectionMatrix();
    scope.dispatchEvent(changeEvent);

    scope.update();

    state = STATE.NONE;
  };

  // this method is exposed, but perhaps it would be better if we can make it private...
  this.update = (function () {
    var offset = new Vector3();

    // so camera.up is the orbit axis
    var quat = new Quaternion().setFromUnitVectors(
      object.up,
      new Vector3(0, 1, 0)
    );
    var quatInverse = quat.clone().inverse();

    var lastPosition = new Vector3();
    var lastQuaternion = new Quaternion();

    return function update() {
      var position = scope.object.position;

      offset.copy(position).sub(scope.target);

      // rotate offset to "y-axis-is-up" space
      offset.applyQuaternion(quat);

      // angle from z-axis around y-axis
      spherical.setFromVector3(offset);

      if (scope.autoRotate && state === STATE.NONE) {
        rotateLeft(getAutoRotationAngle());
      }

      if (scope.enableDamping) {
        spherical.theta += sphericalDelta.theta * scope.dampingFactor;
        spherical.phi += sphericalDelta.phi * scope.dampingFactor;
      } else {
        spherical.theta += sphericalDelta.theta;
        spherical.phi += sphericalDelta.phi;
      }

      // restrict theta to be between desired limits
      spherical.theta = Math.max(
        scope.minAzimuthAngle,
        Math.min(scope.maxAzimuthAngle, spherical.theta)
      );

      // restrict phi to be between desired limits
      spherical.phi = Math.max(
        scope.minPolarAngle,
        Math.min(scope.maxPolarAngle, spherical.phi)
      );

      spherical.makeSafe();

      spherical.radius *= scale;

      // restrict radius to be between desired limits
      spherical.radius = Math.max(
        scope.minDistance,
        Math.min(scope.maxDistance, spherical.radius)
      );

      // move target to panned location

      if (scope.enableDamping === true) {
        scope.target.addScaledVector(panOffset, scope.dampingFactor);
      } else {
        scope.target.add(panOffset);
      }

      offset.setFromSpherical(spherical);

      // rotate offset back to "camera-up-vector-is-up" space
      offset.applyQuaternion(quatInverse);

      position.copy(scope.target).add(offset);

      scope.object.lookAt(scope.target);

      if (scope.enableDamping === true) {
        sphericalDelta.theta *= 1 - scope.dampingFactor;
        sphericalDelta.phi *= 1 - scope.dampingFactor;

        panOffset.multiplyScalar(1 - scope.dampingFactor);
      } else {
        sphericalDelta.set(0, 0, 0);

        panOffset.set(0, 0, 0);
      }

      scale = 1;

      // update condition is:
      // min(camera displacement, camera rotation in radians)^2 > EPS
      // using small-angle approximation cos(x/2) = 1 - x^2 / 8

      if (
        zoomChanged ||
        lastPosition.distanceToSquared(scope.object.position) > EPS ||
        8 * (1 - lastQuaternion.dot(scope.object.quaternion)) > EPS
      ) {
        scope.dispatchEvent(changeEvent);

        lastPosition.copy(scope.object.position);
        lastQuaternion.copy(scope.object.quaternion);
        zoomChanged = false;

        return true;
      }

      return false;
    };
  })();

  this.dispose = function () {
    scope.domElement.removeEventListener("contextmenu", onContextMenu, false);
    scope.domElement.removeEventListener("mousedown", onMouseDown, false);
    scope.domElement.removeEventListener("wheel", onMouseWheel, false);

    scope.domElement.removeEventListener("touchstart", onTouchStart, false);
    scope.domElement.removeEventListener("touchend", onTouchEnd, false);
    scope.domElement.removeEventListener("touchmove", onTouchMove, false);

    document.removeEventListener("mousemove", onMouseMove, false);
    document.removeEventListener("mouseup", onMouseUp, false);

    scope.domElement.removeEventListener("keydown", onKeyDown, false);

    //scope.dispatchEvent( { type: 'dispose' } ); // should this be added here?
  };

  //
  // internals
  //

  var scope = this;

  var changeEvent = { type: "change" };
  var startEvent = { type: "start" };
  var endEvent = { type: "end" };

  var STATE = {
    NONE: -1,
    ROTATE: 0,
    DOLLY: 1,
    PAN: 2,
    TOUCH_ROTATE: 3,
    TOUCH_PAN: 4,
    TOUCH_DOLLY_PAN: 5,
    TOUCH_DOLLY_ROTATE: 6,
  };

  var state = STATE.NONE;

  var EPS = 0.000001;

  // current position in spherical coordinates
  var spherical = new Spherical();
  var sphericalDelta = new Spherical();

  var scale = 1;
  var panOffset = new Vector3();
  var zoomChanged = false;

  var rotateStart = new Vector2();
  var rotateEnd = new Vector2();
  var rotateDelta = new Vector2();

  var panStart = new Vector2();
  var panEnd = new Vector2();
  var panDelta = new Vector2();

  var dollyStart = new Vector2();
  var dollyEnd = new Vector2();
  var dollyDelta = new Vector2();

  function getAutoRotationAngle() {
    return ((2 * Math.PI) / 60 / 60) * scope.autoRotateSpeed;
  }

  function getZoomScale() {
    return Math.pow(0.95, scope.zoomSpeed);
  }

  function rotateLeft(angle) {
    sphericalDelta.theta -= angle;
  }

  function rotateUp(angle) {
    sphericalDelta.phi -= angle;
  }

  var panLeft = (function () {
    var v = new Vector3();

    return function panLeft(distance, objectMatrix) {
      v.setFromMatrixColumn(objectMatrix, 0); // get X column of objectMatrix
      v.multiplyScalar(-distance);

      panOffset.add(v);
    };
  })();

  var panUp = (function () {
    var v = new Vector3();

    return function panUp(distance, objectMatrix) {
      if (scope.screenSpacePanning === true) {
        v.setFromMatrixColumn(objectMatrix, 1);
      } else {
        v.setFromMatrixColumn(objectMatrix, 0);
        v.crossVectors(scope.object.up, v);
      }

      v.multiplyScalar(distance);

      panOffset.add(v);
    };
  })();

  // deltaX and deltaY are in pixels; right and down are positive
  var pan = (function () {
    var offset = new Vector3();

    return function pan(deltaX, deltaY) {
      var element = scope.domElement;

      if (scope.object.isPerspectiveCamera) {
        // perspective
        var position = scope.object.position;
        offset.copy(position).sub(scope.target);
        var targetDistance = offset.length();

        // half of the fov is center to top of screen
        targetDistance *= Math.tan(((scope.object.fov / 2) * Math.PI) / 180.0);

        // we use only clientHeight here so aspect ratio does not distort speed
        panLeft(
          (2 * deltaX * targetDistance) / element.clientHeight,
          scope.object.matrix
        );
        panUp(
          (2 * deltaY * targetDistance) / element.clientHeight,
          scope.object.matrix
        );
      } else if (scope.object.isOrthographicCamera) {
        // orthographic
        panLeft(
          (deltaX * (scope.object.right - scope.object.left)) /
            scope.object.zoom /
            element.clientWidth,
          scope.object.matrix
        );
        panUp(
          (deltaY * (scope.object.top - scope.object.bottom)) /
            scope.object.zoom /
            element.clientHeight,
          scope.object.matrix
        );
      } else {
        // camera neither orthographic nor perspective
        console.warn(
          "WARNING: OrbitControls.js encountered an unknown camera type - pan disabled."
        );
        scope.enablePan = false;
      }
    };
  })();

  function dollyOut(dollyScale) {
    if (scope.object.isPerspectiveCamera) {
      scale /= dollyScale;
    } else if (scope.object.isOrthographicCamera) {
      scope.object.zoom = Math.max(
        scope.minZoom,
        Math.min(scope.maxZoom, scope.object.zoom * dollyScale)
      );
      scope.object.updateProjectionMatrix();
      zoomChanged = true;
    } else {
      console.warn(
        "WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled."
      );
      scope.enableZoom = false;
    }
  }

  function dollyIn(dollyScale) {
    if (scope.object.isPerspectiveCamera) {
      scale *= dollyScale;
    } else if (scope.object.isOrthographicCamera) {
      scope.object.zoom = Math.max(
        scope.minZoom,
        Math.min(scope.maxZoom, scope.object.zoom / dollyScale)
      );
      scope.object.updateProjectionMatrix();
      zoomChanged = true;
    } else {
      console.warn(
        "WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled."
      );
      scope.enableZoom = false;
    }
  }

  //
  // event callbacks - update the object state
  //

  function handleMouseDownRotate(event) {
    rotateStart.set(event.clientX, event.clientY);
  }

  function handleMouseDownDolly(event) {
    dollyStart.set(event.clientX, event.clientY);
  }

  function handleMouseDownPan(event) {
    panStart.set(event.clientX, event.clientY);
  }

  function handleMouseMoveRotate(event) {
    rotateEnd.set(event.clientX, event.clientY);

    rotateDelta
      .subVectors(rotateEnd, rotateStart)
      .multiplyScalar(scope.rotateSpeed);

    var element = scope.domElement;

    rotateLeft((2 * Math.PI * rotateDelta.x) / element.clientHeight); // yes, height

    rotateUp((2 * Math.PI * rotateDelta.y) / element.clientHeight);

    rotateStart.copy(rotateEnd);

    scope.update();
  }

  function handleMouseMoveDolly(event) {
    dollyEnd.set(event.clientX, event.clientY);

    dollyDelta.subVectors(dollyEnd, dollyStart);

    if (dollyDelta.y > 0) {
      dollyOut(getZoomScale());
    } else if (dollyDelta.y < 0) {
      dollyIn(getZoomScale());
    }

    dollyStart.copy(dollyEnd);

    scope.update();
  }

  function handleMouseMovePan(event) {
    panEnd.set(event.clientX, event.clientY);

    panDelta.subVectors(panEnd, panStart).multiplyScalar(scope.panSpeed);

    pan(panDelta.x, panDelta.y);

    panStart.copy(panEnd);

    scope.update();
  }

  function handleMouseUp(/*event*/) {
    // no-op
  }

  function handleMouseWheel(event) {
    if (event.deltaY < 0) {
      dollyIn(getZoomScale());
    } else if (event.deltaY > 0) {
      dollyOut(getZoomScale());
    }

    scope.update();
  }

  function handleKeyDown(event) {
    var needsUpdate = false;

    switch (event.keyCode) {
      case scope.keys.UP:
        pan(0, scope.keyPanSpeed);
        needsUpdate = true;
        break;

      case scope.keys.BOTTOM:
        pan(0, -scope.keyPanSpeed);
        needsUpdate = true;
        break;

      case scope.keys.LEFT:
        pan(scope.keyPanSpeed, 0);
        needsUpdate = true;
        break;

      case scope.keys.RIGHT:
        pan(-scope.keyPanSpeed, 0);
        needsUpdate = true;
        break;
    }

    if (needsUpdate) {
      // prevent the browser from scrolling on cursor keys
      event.preventDefault();

      scope.update();
    }
  }

  function handleTouchStartRotate(event) {
    if (event.touches.length == 1) {
      rotateStart.set(event.touches[0].pageX, event.touches[0].pageY);
    } else {
      var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX);
      var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY);

      rotateStart.set(x, y);
    }
  }

  function handleTouchStartPan(event) {
    if (event.touches.length == 1) {
      panStart.set(event.touches[0].pageX, event.touches[0].pageY);
    } else {
      var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX);
      var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY);

      panStart.set(x, y);
    }
  }

  function handleTouchStartDolly(event) {
    var dx = event.touches[0].pageX - event.touches[1].pageX;
    var dy = event.touches[0].pageY - event.touches[1].pageY;

    var distance = Math.sqrt(dx * dx + dy * dy);

    dollyStart.set(0, distance);
  }

  function handleTouchStartDollyPan(event) {
    if (scope.enableZoom) handleTouchStartDolly(event);

    if (scope.enablePan) handleTouchStartPan(event);
  }

  function handleTouchStartDollyRotate(event) {
    if (scope.enableZoom) handleTouchStartDolly(event);

    if (scope.enableRotate) handleTouchStartRotate(event);
  }

  function handleTouchMoveRotate(event) {
    if (event.touches.length == 1) {
      rotateEnd.set(event.touches[0].pageX, event.touches[0].pageY);
    } else {
      var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX);
      var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY);

      rotateEnd.set(x, y);
    }

    rotateDelta
      .subVectors(rotateEnd, rotateStart)
      .multiplyScalar(scope.rotateSpeed);

    var element = scope.domElement;

    rotateLeft((2 * Math.PI * rotateDelta.x) / element.clientHeight); // yes, height

    rotateUp((2 * Math.PI * rotateDelta.y) / element.clientHeight);

    rotateStart.copy(rotateEnd);
  }

  function handleTouchMovePan(event) {
    if (event.touches.length == 1) {
      panEnd.set(event.touches[0].pageX, event.touches[0].pageY);
    } else {
      var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX);
      var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY);

      panEnd.set(x, y);
    }

    panDelta.subVectors(panEnd, panStart).multiplyScalar(scope.panSpeed);

    pan(panDelta.x, panDelta.y);

    panStart.copy(panEnd);
  }

  function handleTouchMoveDolly(event) {
    var dx = event.touches[0].pageX - event.touches[1].pageX;
    var dy = event.touches[0].pageY - event.touches[1].pageY;

    var distance = Math.sqrt(dx * dx + dy * dy);

    dollyEnd.set(0, distance);

    dollyDelta.set(0, Math.pow(dollyEnd.y / dollyStart.y, scope.zoomSpeed));

    dollyOut(dollyDelta.y);

    dollyStart.copy(dollyEnd);
  }

  function handleTouchMoveDollyPan(event) {
    if (scope.enableZoom) handleTouchMoveDolly(event);

    if (scope.enablePan) handleTouchMovePan(event);
  }

  function handleTouchMoveDollyRotate(event) {
    if (scope.enableZoom) handleTouchMoveDolly(event);

    if (scope.enableRotate) handleTouchMoveRotate(event);
  }

  function handleTouchEnd(/*event*/) {
    // no-op
  }

  //
  // event handlers - FSM: listen for events and reset state
  //

  function onMouseDown(event) {
    if (scope.enabled === false) return;

    // Prevent the browser from scrolling.
    event.preventDefault();

    // Manually set the focus since calling preventDefault above
    // prevents the browser from setting it automatically.

    scope.domElement.focus ? scope.domElement.focus() : window.focus();

    var mouseAction;

    switch (event.button) {
      case 0:
        mouseAction = scope.mouseButtons.LEFT;
        break;

      case 1:
        mouseAction = scope.mouseButtons.MIDDLE;
        break;

      case 2:
        mouseAction = scope.mouseButtons.RIGHT;
        break;

      default:
        mouseAction = -1;
    }

    switch (mouseAction) {
      case MOUSE.DOLLY:
        if (scope.enableZoom === false) return;

        handleMouseDownDolly(event);

        state = STATE.DOLLY;

        break;

      case MOUSE.ROTATE:
        if (event.ctrlKey || event.metaKey || event.shiftKey) {
          if (scope.enablePan === false) return;

          handleMouseDownPan(event);

          state = STATE.PAN;
        } else {
          if (scope.enableRotate === false) return;

          handleMouseDownRotate(event);

          state = STATE.ROTATE;
        }

        break;

      case MOUSE.PAN:
        if (event.ctrlKey || event.metaKey || event.shiftKey) {
          if (scope.enableRotate === false) return;

          handleMouseDownRotate(event);

          state = STATE.ROTATE;
        } else {
          if (scope.enablePan === false) return;

          handleMouseDownPan(event);

          state = STATE.PAN;
        }

        break;

      default:
        state = STATE.NONE;
    }

    if (state !== STATE.NONE) {
      document.addEventListener("mousemove", onMouseMove, false);
      document.addEventListener("mouseup", onMouseUp, false);

      scope.dispatchEvent(startEvent);
    }
  }

  function onMouseMove(event) {
    if (scope.enabled === false) return;

    event.preventDefault();

    switch (state) {
      case STATE.ROTATE:
        if (scope.enableRotate === false) return;

        handleMouseMoveRotate(event);

        break;

      case STATE.DOLLY:
        if (scope.enableZoom === false) return;

        handleMouseMoveDolly(event);

        break;

      case STATE.PAN:
        if (scope.enablePan === false) return;

        handleMouseMovePan(event);

        break;
    }
  }

  function onMouseUp(event) {
    if (scope.enabled === false) return;

    handleMouseUp(event);

    document.removeEventListener("mousemove", onMouseMove, false);
    document.removeEventListener("mouseup", onMouseUp, false);

    scope.dispatchEvent(endEvent);

    state = STATE.NONE;
  }

  function onMouseWheel(event) {
    if (
      scope.enabled === false ||
      scope.enableZoom === false ||
      (state !== STATE.NONE && state !== STATE.ROTATE)
    )
      return;

    event.preventDefault();
    event.stopPropagation();

    scope.dispatchEvent(startEvent);

    handleMouseWheel(event);

    scope.dispatchEvent(endEvent);
  }

  function onKeyDown(event) {
    if (
      scope.enabled === false ||
      scope.enableKeys === false ||
      scope.enablePan === false
    )
      return;

    handleKeyDown(event);
  }

  function onTouchStart(event) {
    if (scope.enabled === false) return;

    event.preventDefault(); // prevent scrolling

    switch (event.touches.length) {
      case 1:
        switch (scope.touches.ONE) {
          case TOUCH.ROTATE:
            if (scope.enableRotate === false) return;

            handleTouchStartRotate(event);

            state = STATE.TOUCH_ROTATE;

            break;

          case TOUCH.PAN:
            if (scope.enablePan === false) return;

            handleTouchStartPan(event);

            state = STATE.TOUCH_PAN;

            break;

          default:
            state = STATE.NONE;
        }

        break;

      case 2:
        switch (scope.touches.TWO) {
          case TOUCH.DOLLY_PAN:
            if (scope.enableZoom === false && scope.enablePan === false) return;

            handleTouchStartDollyPan(event);

            state = STATE.TOUCH_DOLLY_PAN;

            break;

          case TOUCH.DOLLY_ROTATE:
            if (scope.enableZoom === false && scope.enableRotate === false)
              return;

            handleTouchStartDollyRotate(event);

            state = STATE.TOUCH_DOLLY_ROTATE;

            break;

          default:
            state = STATE.NONE;
        }

        break;

      default:
        state = STATE.NONE;
    }

    if (state !== STATE.NONE) {
      scope.dispatchEvent(startEvent);
    }
  }

  function onTouchMove(event) {
    if (scope.enabled === false) return;

    event.preventDefault(); // prevent scrolling
    event.stopPropagation();

    switch (state) {
      case STATE.TOUCH_ROTATE:
        if (scope.enableRotate === false) return;

        handleTouchMoveRotate(event);

        scope.update();

        break;

      case STATE.TOUCH_PAN:
        if (scope.enablePan === false) return;

        handleTouchMovePan(event);

        scope.update();

        break;

      case STATE.TOUCH_DOLLY_PAN:
        if (scope.enableZoom === false && scope.enablePan === false) return;

        handleTouchMoveDollyPan(event);

        scope.update();

        break;

      case STATE.TOUCH_DOLLY_ROTATE:
        if (scope.enableZoom === false && scope.enableRotate === false) return;

        handleTouchMoveDollyRotate(event);

        scope.update();

        break;

      default:
        state = STATE.NONE;
    }
  }

  function onTouchEnd(event) {
    if (scope.enabled === false) return;

    handleTouchEnd(event);

    scope.dispatchEvent(endEvent);

    state = STATE.NONE;
  }

  function onContextMenu(event) {
    if (scope.enabled === false) return;

    event.preventDefault();
  }

  //

  scope.domElement.addEventListener("contextmenu", onContextMenu, false);

  scope.domElement.addEventListener("mousedown", onMouseDown, false);
  scope.domElement.addEventListener("wheel", onMouseWheel, false);

  scope.domElement.addEventListener("touchstart", onTouchStart, false);
  scope.domElement.addEventListener("touchend", onTouchEnd, false);
  scope.domElement.addEventListener("touchmove", onTouchMove, false);

  scope.domElement.addEventListener("keydown", onKeyDown, false);

  // make sure element can receive keys.

  if (scope.domElement.tabIndex === -1) {
    scope.domElement.tabIndex = 0;
  }

  // force an update at start

  this.update();
}

OrbitControls = function ( object, domElement ) {

	if ( domElement === undefined ) console.warn( 'THREE.OrbitControls: The second parameter "domElement" is now mandatory.' );
	if ( domElement === document ) console.error( 'THREE.OrbitControls: "document" should not be used as the target "domElement". Please use "renderer.domElement" instead.' );

	this.object = object;
	this.domElement = domElement;

	// Set to false to disable this control
	this.enabled = true;

	// "target" sets the location of focus, where the object orbits around
	this.target = new Vector3();

	// How far you can dolly in and out ( PerspectiveCamera only )
	this.minDistance = 0;
	this.maxDistance = Infinity;

	// How far you can zoom in and out ( OrthographicCamera only )
	this.minZoom = 0;
	this.maxZoom = Infinity;

	// How far you can orbit vertically, upper and lower limits.
	// Range is 0 to Math.PI radians.
	this.minPolarAngle = 0; // radians
	this.maxPolarAngle = Math.PI; // radians

	// How far you can orbit horizontally, upper and lower limits.
	// If set, must be a sub-interval of the interval [ - Math.PI, Math.PI ].
	this.minAzimuthAngle = - Infinity; // radians
	this.maxAzimuthAngle = Infinity; // radians

	// Set to true to enable damping (inertia)
	// If damping is enabled, you must call controls.update() in your animation loop
	this.enableDamping = false;
	this.dampingFactor = 0.05;

	// This option actually enables dollying in and out; left as "zoom" for backwards compatibility.
	// Set to false to disable zooming
	this.enableZoom = true;
	this.zoomSpeed = 1.0;

	// Set to false to disable rotating
	this.enableRotate = true;
	this.rotateSpeed = 1.0;

	// Set to false to disable panning
	this.enablePan = true;
	this.panSpeed = 1.0;
	this.screenSpacePanning = false; // if true, pan in screen-space
	this.keyPanSpeed = 7.0;	// pixels moved per arrow key push

	// Set to true to automatically rotate around the target
	// If auto-rotate is enabled, you must call controls.update() in your animation loop
	this.autoRotate = false;
	this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60

	// Set to false to disable use of the keys
	this.enableKeys = true;

	// The four arrow keys
	this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 };

	// Mouse buttons
	this.mouseButtons = { LEFT: MOUSE.ROTATE, MIDDLE: MOUSE.DOLLY, RIGHT: MOUSE.PAN };

	// Touch fingers
	this.touches = { ONE: TOUCH.ROTATE, TWO: TOUCH.DOLLY_PAN };

	// for reset
	this.target0 = this.target.clone();
	this.position0 = this.object.position.clone();
	this.zoom0 = this.object.zoom;

	//
	// public methods
	//

	this.getPolarAngle = function () {

		return spherical.phi;

	};

	this.getAzimuthalAngle = function () {

		return spherical.theta;

	};

	this.saveState = function () {

		scope.target0.copy( scope.target );
		scope.position0.copy( scope.object.position );
		scope.zoom0 = scope.object.zoom;

	};

	this.reset = function () {

		scope.target.copy( scope.target0 );
		scope.object.position.copy( scope.position0 );
		scope.object.zoom = scope.zoom0;

		scope.object.updateProjectionMatrix();
		scope.dispatchEvent( changeEvent );

		scope.update();

		state = STATE.NONE;

	};

	// this method is exposed, but perhaps it would be better if we can make it private...
	this.update = function () {

		var offset = new Vector3();

		// so camera.up is the orbit axis
		var quat = new Quaternion().setFromUnitVectors( object.up, new Vector3( 0, 1, 0 ) );
		var quatInverse = quat.clone().inverse();

		var lastPosition = new Vector3();
		var lastQuaternion = new Quaternion();

		return function update() {

			var position = scope.object.position;

			offset.copy( position ).sub( scope.target );

			// rotate offset to "y-axis-is-up" space
			offset.applyQuaternion( quat );

			// angle from z-axis around y-axis
			spherical.setFromVector3( offset );

			if ( scope.autoRotate && state === STATE.NONE ) {

				rotateLeft( getAutoRotationAngle() );

			}

			if ( scope.enableDamping ) {

				spherical.theta += sphericalDelta.theta * scope.dampingFactor;
				spherical.phi += sphericalDelta.phi * scope.dampingFactor;

			} else {

				spherical.theta += sphericalDelta.theta;
				spherical.phi += sphericalDelta.phi;

			}

			// restrict theta to be between desired limits
			spherical.theta = Math.max( scope.minAzimuthAngle, Math.min( scope.maxAzimuthAngle, spherical.theta ) );

			// restrict phi to be between desired limits
			spherical.phi = Math.max( scope.minPolarAngle, Math.min( scope.maxPolarAngle, spherical.phi ) );

			spherical.makeSafe();


			spherical.radius *= scale;

			// restrict radius to be between desired limits
			spherical.radius = Math.max( scope.minDistance, Math.min( scope.maxDistance, spherical.radius ) );

			// move target to panned location

			if ( scope.enableDamping === true ) {

				scope.target.addScaledVector( panOffset, scope.dampingFactor );

			} else {

				scope.target.add( panOffset );

			}

			offset.setFromSpherical( spherical );

			// rotate offset back to "camera-up-vector-is-up" space
			offset.applyQuaternion( quatInverse );

			position.copy( scope.target ).add( offset );

			scope.object.lookAt( scope.target );

			if ( scope.enableDamping === true ) {

				sphericalDelta.theta *= ( 1 - scope.dampingFactor );
				sphericalDelta.phi *= ( 1 - scope.dampingFactor );

				panOffset.multiplyScalar( 1 - scope.dampingFactor );

			} else {

				sphericalDelta.set( 0, 0, 0 );

				panOffset.set( 0, 0, 0 );

			}

			scale = 1;

			// update condition is:
			// min(camera displacement, camera rotation in radians)^2 > EPS
			// using small-angle approximation cos(x/2) = 1 - x^2 / 8

			if ( zoomChanged ||
				lastPosition.distanceToSquared( scope.object.position ) > EPS ||
				8 * ( 1 - lastQuaternion.dot( scope.object.quaternion ) ) > EPS ) {

				scope.dispatchEvent( changeEvent );

				lastPosition.copy( scope.object.position );
				lastQuaternion.copy( scope.object.quaternion );
				zoomChanged = false;

				return true;

			}

			return false;

		};

	}();

	this.dispose = function () {

		scope.domElement.removeEventListener( 'contextmenu', onContextMenu, false );
		scope.domElement.removeEventListener( 'mousedown', onMouseDown, false );
		scope.domElement.removeEventListener( 'wheel', onMouseWheel, false );

		scope.domElement.removeEventListener( 'touchstart', onTouchStart, false );
		scope.domElement.removeEventListener( 'touchend', onTouchEnd, false );
		scope.domElement.removeEventListener( 'touchmove', onTouchMove, false );

		document.removeEventListener( 'mousemove', onMouseMove, false );
		document.removeEventListener( 'mouseup', onMouseUp, false );

		scope.domElement.removeEventListener( 'keydown', onKeyDown, false );

		//scope.dispatchEvent( { type: 'dispose' } ); // should this be added here?

	};

	//
	// internals
	//

	var scope = this;

	var changeEvent = { type: 'change' };
	var startEvent = { type: 'start' };
	var endEvent = { type: 'end' };

	var STATE = {
		NONE: - 1,
		ROTATE: 0,
		DOLLY: 1,
		PAN: 2,
		TOUCH_ROTATE: 3,
		TOUCH_PAN: 4,
		TOUCH_DOLLY_PAN: 5,
		TOUCH_DOLLY_ROTATE: 6
	};

	var state = STATE.NONE;

	var EPS = 0.000001;

	// current position in spherical coordinates
	var spherical = new Spherical();
	var sphericalDelta = new Spherical();

	var scale = 1;
	var panOffset = new Vector3();
	var zoomChanged = false;

	var rotateStart = new Vector2();
	var rotateEnd = new Vector2();
	var rotateDelta = new Vector2();

	var panStart = new Vector2();
	var panEnd = new Vector2();
	var panDelta = new Vector2();

	var dollyStart = new Vector2();
	var dollyEnd = new Vector2();
	var dollyDelta = new Vector2();

	function getAutoRotationAngle() {

		return 2 * Math.PI / 60 / 60 * scope.autoRotateSpeed;

	}

	function getZoomScale() {

		return Math.pow( 0.95, scope.zoomSpeed );

	}

	function rotateLeft( angle ) {

		sphericalDelta.theta -= angle;

	}

	function rotateUp( angle ) {

		sphericalDelta.phi -= angle;

	}

	var panLeft = function () {

		var v = new Vector3();

		return function panLeft( distance, objectMatrix ) {

			v.setFromMatrixColumn( objectMatrix, 0 ); // get X column of objectMatrix
			v.multiplyScalar( - distance );

			panOffset.add( v );

		};

	}();

	var panUp = function () {

		var v = new Vector3();

		return function panUp( distance, objectMatrix ) {

			if ( scope.screenSpacePanning === true ) {

				v.setFromMatrixColumn( objectMatrix, 1 );

			} else {

				v.setFromMatrixColumn( objectMatrix, 0 );
				v.crossVectors( scope.object.up, v );

			}

			v.multiplyScalar( distance );

			panOffset.add( v );

		};

	}();

	// deltaX and deltaY are in pixels; right and down are positive
	var pan = function () {

		var offset = new Vector3();

		return function pan( deltaX, deltaY ) {

			var element = scope.domElement;

			if ( scope.object.isPerspectiveCamera ) {

				// perspective
				var position = scope.object.position;
				offset.copy( position ).sub( scope.target );
				var targetDistance = offset.length();

				// half of the fov is center to top of screen
				targetDistance *= Math.tan( ( scope.object.fov / 2 ) * Math.PI / 180.0 );

				// we use only clientHeight here so aspect ratio does not distort speed
				panLeft( 2 * deltaX * targetDistance / element.clientHeight, scope.object.matrix );
				panUp( 2 * deltaY * targetDistance / element.clientHeight, scope.object.matrix );

			} else if ( scope.object.isOrthographicCamera ) {

				// orthographic
				panLeft( deltaX * ( scope.object.right - scope.object.left ) / scope.object.zoom / element.clientWidth, scope.object.matrix );
				panUp( deltaY * ( scope.object.top - scope.object.bottom ) / scope.object.zoom / element.clientHeight, scope.object.matrix );

			} else {

				// camera neither orthographic nor perspective
				console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - pan disabled.' );
				scope.enablePan = false;

			}

		};

	}();

	function dollyOut( dollyScale ) {

		if ( scope.object.isPerspectiveCamera ) {

			scale /= dollyScale;

		} else if ( scope.object.isOrthographicCamera ) {

			scope.object.zoom = Math.max( scope.minZoom, Math.min( scope.maxZoom, scope.object.zoom * dollyScale ) );
			scope.object.updateProjectionMatrix();
			zoomChanged = true;

		} else {

			console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.' );
			scope.enableZoom = false;

		}

	}

	function dollyIn( dollyScale ) {

		if ( scope.object.isPerspectiveCamera ) {

			scale *= dollyScale;

		} else if ( scope.object.isOrthographicCamera ) {

			scope.object.zoom = Math.max( scope.minZoom, Math.min( scope.maxZoom, scope.object.zoom / dollyScale ) );
			scope.object.updateProjectionMatrix();
			zoomChanged = true;

		} else {

			console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.' );
			scope.enableZoom = false;

		}

	}

	//
	// event callbacks - update the object state
	//

	function handleMouseDownRotate( event ) {

		rotateStart.set( event.clientX, event.clientY );

	}

	function handleMouseDownDolly( event ) {

		dollyStart.set( event.clientX, event.clientY );

	}

	function handleMouseDownPan( event ) {

		panStart.set( event.clientX, event.clientY );

	}

	function handleMouseMoveRotate( event ) {

		rotateEnd.set( event.clientX, event.clientY );

		rotateDelta.subVectors( rotateEnd, rotateStart ).multiplyScalar( scope.rotateSpeed );

		var element = scope.domElement;

		rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientHeight ); // yes, height

		rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight );

		rotateStart.copy( rotateEnd );

		scope.update();

	}

	function handleMouseMoveDolly( event ) {

		dollyEnd.set( event.clientX, event.clientY );

		dollyDelta.subVectors( dollyEnd, dollyStart );

		if ( dollyDelta.y > 0 ) {

			dollyOut( getZoomScale() );

		} else if ( dollyDelta.y < 0 ) {

			dollyIn( getZoomScale() );

		}

		dollyStart.copy( dollyEnd );

		scope.update();

	}

	function handleMouseMovePan( event ) {

		panEnd.set( event.clientX, event.clientY );

		panDelta.subVectors( panEnd, panStart ).multiplyScalar( scope.panSpeed );

		pan( panDelta.x, panDelta.y );

		panStart.copy( panEnd );

		scope.update();

	}

	function handleMouseUp( /*event*/ ) {

		// no-op

	}

	function handleMouseWheel( event ) {

		if ( event.deltaY < 0 ) {

			dollyIn( getZoomScale() );

		} else if ( event.deltaY > 0 ) {

			dollyOut( getZoomScale() );

		}

		scope.update();

	}

	function handleKeyDown( event ) {

		var needsUpdate = false;

		switch ( event.keyCode ) {

			case scope.keys.UP:
				pan( 0, scope.keyPanSpeed );
				needsUpdate = true;
				break;

			case scope.keys.BOTTOM:
				pan( 0, - scope.keyPanSpeed );
				needsUpdate = true;
				break;

			case scope.keys.LEFT:
				pan( scope.keyPanSpeed, 0 );
				needsUpdate = true;
				break;

			case scope.keys.RIGHT:
				pan( - scope.keyPanSpeed, 0 );
				needsUpdate = true;
				break;

		}

		if ( needsUpdate ) {

			// prevent the browser from scrolling on cursor keys
			event.preventDefault();

			scope.update();

		}


	}

	function handleTouchStartRotate( event ) {

		if ( event.touches.length == 1 ) {

			rotateStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

		} else {

			var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
			var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );

			rotateStart.set( x, y );

		}

	}

	function handleTouchStartPan( event ) {

		if ( event.touches.length == 1 ) {

			panStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

		} else {

			var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
			var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );

			panStart.set( x, y );

		}

	}

	function handleTouchStartDolly( event ) {

		var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
		var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;

		var distance = Math.sqrt( dx * dx + dy * dy );

		dollyStart.set( 0, distance );

	}

	function handleTouchStartDollyPan( event ) {

		if ( scope.enableZoom ) handleTouchStartDolly( event );

		if ( scope.enablePan ) handleTouchStartPan( event );

	}

	function handleTouchStartDollyRotate( event ) {

		if ( scope.enableZoom ) handleTouchStartDolly( event );

		if ( scope.enableRotate ) handleTouchStartRotate( event );

	}

	function handleTouchMoveRotate( event ) {

		if ( event.touches.length == 1 ) {

			rotateEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

		} else {

			var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
			var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );

			rotateEnd.set( x, y );

		}

		rotateDelta.subVectors( rotateEnd, rotateStart ).multiplyScalar( scope.rotateSpeed );

		var element = scope.domElement;

		rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientHeight ); // yes, height

		rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight );

		rotateStart.copy( rotateEnd );

	}

	function handleTouchMovePan( event ) {

		if ( event.touches.length == 1 ) {

			panEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

		} else {

			var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
			var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );

			panEnd.set( x, y );

		}

		panDelta.subVectors( panEnd, panStart ).multiplyScalar( scope.panSpeed );

		pan( panDelta.x, panDelta.y );

		panStart.copy( panEnd );

	}

	function handleTouchMoveDolly( event ) {

		var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
		var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;

		var distance = Math.sqrt( dx * dx + dy * dy );

		dollyEnd.set( 0, distance );

		dollyDelta.set( 0, Math.pow( dollyEnd.y / dollyStart.y, scope.zoomSpeed ) );

		dollyOut( dollyDelta.y );

		dollyStart.copy( dollyEnd );

	}

	function handleTouchMoveDollyPan( event ) {

		if ( scope.enableZoom ) handleTouchMoveDolly( event );

		if ( scope.enablePan ) handleTouchMovePan( event );

	}

	function handleTouchMoveDollyRotate( event ) {

		if ( scope.enableZoom ) handleTouchMoveDolly( event );

		if ( scope.enableRotate ) handleTouchMoveRotate( event );

	}

	function handleTouchEnd( /*event*/ ) {

		// no-op

	}

	//
	// event handlers - FSM: listen for events and reset state
	//

	function onMouseDown( event ) {

		if ( scope.enabled === false ) return;

		// Prevent the browser from scrolling.
		event.preventDefault();

		// Manually set the focus since calling preventDefault above
		// prevents the browser from setting it automatically.

		scope.domElement.focus ? scope.domElement.focus() : window.focus();

		var mouseAction;

		switch ( event.button ) {

			case 0:

				mouseAction = scope.mouseButtons.LEFT;
				break;

			case 1:

				mouseAction = scope.mouseButtons.MIDDLE;
				break;

			case 2:

				mouseAction = scope.mouseButtons.RIGHT;
				break;

			default:

				mouseAction = - 1;

		}

		switch ( mouseAction ) {

			case MOUSE.DOLLY:

				if ( scope.enableZoom === false ) return;

				handleMouseDownDolly( event );

				state = STATE.DOLLY;

				break;

			case MOUSE.ROTATE:

				if ( event.ctrlKey || event.metaKey || event.shiftKey ) {

					if ( scope.enablePan === false ) return;

					handleMouseDownPan( event );

					state = STATE.PAN;

				} else {

					if ( scope.enableRotate === false ) return;

					handleMouseDownRotate( event );

					state = STATE.ROTATE;

				}

				break;

			case MOUSE.PAN:

				if ( event.ctrlKey || event.metaKey || event.shiftKey ) {

					if ( scope.enableRotate === false ) return;

					handleMouseDownRotate( event );

					state = STATE.ROTATE;

				} else {

					if ( scope.enablePan === false ) return;

					handleMouseDownPan( event );

					state = STATE.PAN;

				}

				break;

			default:

				state = STATE.NONE;

		}

		if ( state !== STATE.NONE ) {

			document.addEventListener( 'mousemove', onMouseMove, false );
			document.addEventListener( 'mouseup', onMouseUp, false );

			scope.dispatchEvent( startEvent );

		}

	}

	function onMouseMove( event ) {

		if ( scope.enabled === false ) return;

		event.preventDefault();

		switch ( state ) {

			case STATE.ROTATE:

				if ( scope.enableRotate === false ) return;

				handleMouseMoveRotate( event );

				break;

			case STATE.DOLLY:

				if ( scope.enableZoom === false ) return;

				handleMouseMoveDolly( event );

				break;

			case STATE.PAN:

				if ( scope.enablePan === false ) return;

				handleMouseMovePan( event );

				break;

		}

	}

	function onMouseUp( event ) {

		if ( scope.enabled === false ) return;

		handleMouseUp( event );

		document.removeEventListener( 'mousemove', onMouseMove, false );
		document.removeEventListener( 'mouseup', onMouseUp, false );

		scope.dispatchEvent( endEvent );

		state = STATE.NONE;

	}

	function onMouseWheel( event ) {

		if ( scope.enabled === false || scope.enableZoom === false || ( state !== STATE.NONE && state !== STATE.ROTATE ) ) return;

		event.preventDefault();
		event.stopPropagation();

		scope.dispatchEvent( startEvent );

		handleMouseWheel( event );

		scope.dispatchEvent( endEvent );

	}

	function onKeyDown( event ) {

		if ( scope.enabled === false || scope.enableKeys === false || scope.enablePan === false ) return;

		handleKeyDown( event );

	}

	function onTouchStart( event ) {

		if ( scope.enabled === false ) return;

		event.preventDefault(); // prevent scrolling

		switch ( event.touches.length ) {

			case 1:

				switch ( scope.touches.ONE ) {

					case TOUCH.ROTATE:

						if ( scope.enableRotate === false ) return;

						handleTouchStartRotate( event );

						state = STATE.TOUCH_ROTATE;

						break;

					case TOUCH.PAN:

						if ( scope.enablePan === false ) return;

						handleTouchStartPan( event );

						state = STATE.TOUCH_PAN;

						break;

					default:

						state = STATE.NONE;

				}

				break;

			case 2:

				switch ( scope.touches.TWO ) {

					case TOUCH.DOLLY_PAN:

						if ( scope.enableZoom === false && scope.enablePan === false ) return;

						handleTouchStartDollyPan( event );

						state = STATE.TOUCH_DOLLY_PAN;

						break;

					case TOUCH.DOLLY_ROTATE:

						if ( scope.enableZoom === false && scope.enableRotate === false ) return;

						handleTouchStartDollyRotate( event );

						state = STATE.TOUCH_DOLLY_ROTATE;

						break;

					default:

						state = STATE.NONE;

				}

				break;

			default:

				state = STATE.NONE;

		}

		if ( state !== STATE.NONE ) {

			scope.dispatchEvent( startEvent );

		}

	}

	function onTouchMove( event ) {

		if ( scope.enabled === false ) return;

		event.preventDefault(); // prevent scrolling
		event.stopPropagation();

		switch ( state ) {

			case STATE.TOUCH_ROTATE:

				if ( scope.enableRotate === false ) return;

				handleTouchMoveRotate( event );

				scope.update();

				break;

			case STATE.TOUCH_PAN:

				if ( scope.enablePan === false ) return;

				handleTouchMovePan( event );

				scope.update();

				break;

			case STATE.TOUCH_DOLLY_PAN:

				if ( scope.enableZoom === false && scope.enablePan === false ) return;

				handleTouchMoveDollyPan( event );

				scope.update();

				break;

			case STATE.TOUCH_DOLLY_ROTATE:

				if ( scope.enableZoom === false && scope.enableRotate === false ) return;

				handleTouchMoveDollyRotate( event );

				scope.update();

				break;

			default:

				state = STATE.NONE;

		}

	}

	function onTouchEnd( event ) {

		if ( scope.enabled === false ) return;

		handleTouchEnd( event );

		scope.dispatchEvent( endEvent );

		state = STATE.NONE;

	}

	function onContextMenu( event ) {

		if ( scope.enabled === false ) return;

		event.preventDefault();

	}

	//

	scope.domElement.addEventListener( 'contextmenu', onContextMenu, false );

	scope.domElement.addEventListener( 'mousedown', onMouseDown, false );
	scope.domElement.addEventListener( 'wheel', onMouseWheel, false );

	scope.domElement.addEventListener( 'touchstart', onTouchStart, false );
	scope.domElement.addEventListener( 'touchend', onTouchEnd, false );
	scope.domElement.addEventListener( 'touchmove', onTouchMove, false );

	scope.domElement.addEventListener( 'keydown', onKeyDown, false );

	// make sure element can receive keys.

	if ( scope.domElement.tabIndex === - 1 ) {

		scope.domElement.tabIndex = 0;

	}

	// force an update at start

	this.update();

}

OrbitControls = function (object, domElement) {
    if (domElement === undefined)
        console.warn(
            'THREE.OrbitControls: The second parameter "domElement" is now mandatory.'
        );
    if (domElement === document)
        console.error(
            'THREE.OrbitControls: "document" should not be used as the target "domElement". Please use "renderer.domElement" instead.'
        );

    this.object = object;
    this.domElement = domElement;

    // Set to false to disable this control
    this.enabled = true;

    // "target" sets the location of focus, where the object orbits around
    this.target = new Vector3();

    // How far you can dolly in and out ( PerspectiveCamera only )
    this.minDistance = 0;
    this.maxDistance = Infinity;

    // How far you can zoom in and out ( OrthographicCamera only )
    this.minZoom = 0;
    this.maxZoom = Infinity;

    // How far you can orbit vertically, upper and lower limits.
    // Range is 0 to Math.PI radians.
    this.minPolarAngle = 0; // radians
    this.maxPolarAngle = Math.PI; // radians

    // How far you can orbit horizontally, upper and lower limits.
    // If set, must be a sub-interval of the interval [ - Math.PI, Math.PI ].
    this.minAzimuthAngle = -Infinity; // radians
    this.maxAzimuthAngle = Infinity; // radians

    // Set to true to enable damping (inertia)
    // If damping is enabled, you must call controls.update() in your animation loop
    this.enableDamping = false;
    this.dampingFactor = 0.05;

    // This option actually enables dollying in and out; left as "zoom" for backwards compatibility.
    // Set to false to disable zooming
    this.enableZoom = true;
    this.zoomSpeed = 1.0;

    // Set to false to disable rotating
    this.enableRotate = true;
    this.rotateSpeed = 1.0;

    // Set to false to disable panning
    this.enablePan = true;
    this.panSpeed = 1.0;
    this.screenSpacePanning = false; // if true, pan in screen-space
    this.keyPanSpeed = 7.0; // pixels moved per arrow key push

    // Set to true to automatically rotate around the target
    // If auto-rotate is enabled, you must call controls.update() in your animation loop
    this.autoRotate = false;
    this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60

    // Set to false to disable use of the keys
    this.enableKeys = true;

    // The four arrow keys
    this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 };

    // Mouse buttons
    this.mouseButtons = {
        LEFT: MOUSE.ROTATE,
        MIDDLE: MOUSE.DOLLY,
        RIGHT: MOUSE.PAN,
    };

    // Touch fingers
    this.touches = { ONE: TOUCH.ROTATE, TWO: TOUCH.DOLLY_PAN };

    // for reset
    this.target0 = this.target.clone();
    this.position0 = this.object.position.clone();
    this.zoom0 = this.object.zoom;

    //
    // public methods
    //

    this.getPolarAngle = function () {
        return spherical.phi;
    };

    this.getAzimuthalAngle = function () {
        return spherical.theta;
    };

    this.saveState = function () {
        scope.target0.copy(scope.target);
        scope.position0.copy(scope.object.position);
        scope.zoom0 = scope.object.zoom;
    };

    this.reset = function () {
        scope.target.copy(scope.target0);
        scope.object.position.copy(scope.position0);
        scope.object.zoom = scope.zoom0;

        scope.object.updateProjectionMatrix();
        scope.dispatchEvent(changeEvent);

        scope.update();

        state = STATE.NONE;
    };

    // this method is exposed, but perhaps it would be better if we can make it private...
    this.update = (function () {
        var offset = new Vector3();

        // so camera.up is the orbit axis
        var quat = new Quaternion().setFromUnitVectors(
            object.up,
            new Vector3(0, 1, 0)
        );
        var quatInverse = quat.clone().inverse();

        var lastPosition = new Vector3();
        var lastQuaternion = new Quaternion();

        return function update() {
            var position = scope.object.position;

            offset.copy(position).sub(scope.target);

            // rotate offset to "y-axis-is-up" space
            offset.applyQuaternion(quat);

            // angle from z-axis around y-axis
            spherical.setFromVector3(offset);

            if (scope.autoRotate && state === STATE.NONE) {
                rotateLeft(getAutoRotationAngle());
            }

            if (scope.enableDamping) {
                spherical.theta += sphericalDelta.theta * scope.dampingFactor;
                spherical.phi += sphericalDelta.phi * scope.dampingFactor;
            } else {
                spherical.theta += sphericalDelta.theta;
                spherical.phi += sphericalDelta.phi;
            }

            // restrict theta to be between desired limits
            spherical.theta = Math.max(
                scope.minAzimuthAngle,
                Math.min(scope.maxAzimuthAngle, spherical.theta)
            );

            // restrict phi to be between desired limits
            spherical.phi = Math.max(
                scope.minPolarAngle,
                Math.min(scope.maxPolarAngle, spherical.phi)
            );

            spherical.makeSafe();

            spherical.radius *= scale;

            // restrict radius to be between desired limits
            spherical.radius = Math.max(
                scope.minDistance,
                Math.min(scope.maxDistance, spherical.radius)
            );

            // move target to panned location

            if (scope.enableDamping === true) {
                scope.target.addScaledVector(panOffset, scope.dampingFactor);
            } else {
                scope.target.add(panOffset);
            }

            offset.setFromSpherical(spherical);

            // rotate offset back to "camera-up-vector-is-up" space
            offset.applyQuaternion(quatInverse);

            position.copy(scope.target).add(offset);

            scope.object.lookAt(scope.target);

            if (scope.enableDamping === true) {
                sphericalDelta.theta *= 1 - scope.dampingFactor;
                sphericalDelta.phi *= 1 - scope.dampingFactor;

                panOffset.multiplyScalar(1 - scope.dampingFactor);
            } else {
                sphericalDelta.set(0, 0, 0);

                panOffset.set(0, 0, 0);
            }

            scale = 1;

            // update condition is:
            // min(camera displacement, camera rotation in radians)^2 > EPS
            // using small-angle approximation cos(x/2) = 1 - x^2 / 8

            if (
                zoomChanged ||
                lastPosition.distanceToSquared(scope.object.position) > EPS ||
                8 * (1 - lastQuaternion.dot(scope.object.quaternion)) > EPS
            ) {
                scope.dispatchEvent(changeEvent);

                lastPosition.copy(scope.object.position);
                lastQuaternion.copy(scope.object.quaternion);
                zoomChanged = false;

                return true;
            }

            return false;
        };
    })();

    this.dispose = function () {
        scope.domElement.removeEventListener(
            "contextmenu",
            onContextMenu,
            false
        );
        scope.domElement.removeEventListener("mousedown", onMouseDown, false);
        scope.domElement.removeEventListener("wheel", onMouseWheel, false);

        scope.domElement.removeEventListener("touchstart", onTouchStart, false);
        scope.domElement.removeEventListener("touchend", onTouchEnd, false);
        scope.domElement.removeEventListener("touchmove", onTouchMove, false);

        document.removeEventListener("mousemove", onMouseMove, false);
        document.removeEventListener("mouseup", onMouseUp, false);

        scope.domElement.removeEventListener("keydown", onKeyDown, false);

        //scope.dispatchEvent( { type: 'dispose' } ); // should this be added here?
    };

    //
    // internals
    //

    var scope = this;

    var changeEvent = { type: "change" };
    var startEvent = { type: "start" };
    var endEvent = { type: "end" };

    var STATE = {
        NONE: -1,
        ROTATE: 0,
        DOLLY: 1,
        PAN: 2,
        TOUCH_ROTATE: 3,
        TOUCH_PAN: 4,
        TOUCH_DOLLY_PAN: 5,
        TOUCH_DOLLY_ROTATE: 6,
    };

    var state = STATE.NONE;

    var EPS = 0.000001;

    // current position in spherical coordinates
    var spherical = new Spherical();
    var sphericalDelta = new Spherical();

    var scale = 1;
    var panOffset = new Vector3();
    var zoomChanged = false;

    var rotateStart = new Vector2();
    var rotateEnd = new Vector2();
    var rotateDelta = new Vector2();

    var panStart = new Vector2();
    var panEnd = new Vector2();
    var panDelta = new Vector2();

    var dollyStart = new Vector2();
    var dollyEnd = new Vector2();
    var dollyDelta = new Vector2();

    function getAutoRotationAngle() {
        return ((2 * Math.PI) / 60 / 60) * scope.autoRotateSpeed;
    }

    function getZoomScale() {
        return Math.pow(0.95, scope.zoomSpeed);
    }

    function rotateLeft(angle) {
        sphericalDelta.theta -= angle;
    }

    function rotateUp(angle) {
        sphericalDelta.phi -= angle;
    }

    var panLeft = (function () {
        var v = new Vector3();

        return function panLeft(distance, objectMatrix) {
            v.setFromMatrixColumn(objectMatrix, 0); // get X column of objectMatrix
            v.multiplyScalar(-distance);

            panOffset.add(v);
        };
    })();

    var panUp = (function () {
        var v = new Vector3();

        return function panUp(distance, objectMatrix) {
            if (scope.screenSpacePanning === true) {
                v.setFromMatrixColumn(objectMatrix, 1);
            } else {
                v.setFromMatrixColumn(objectMatrix, 0);
                v.crossVectors(scope.object.up, v);
            }

            v.multiplyScalar(distance);

            panOffset.add(v);
        };
    })();

    // deltaX and deltaY are in pixels; right and down are positive
    var pan = (function () {
        var offset = new Vector3();

        return function pan(deltaX, deltaY) {
            var element = scope.domElement;

            if (scope.object.isPerspectiveCamera) {
                // perspective
                var position = scope.object.position;
                offset.copy(position).sub(scope.target);
                var targetDistance = offset.length();

                // half of the fov is center to top of screen
                targetDistance *= Math.tan(
                    ((scope.object.fov / 2) * Math.PI) / 180.0
                );

                // we use only clientHeight here so aspect ratio does not distort speed
                panLeft(
                    (2 * deltaX * targetDistance) / element.clientHeight,
                    scope.object.matrix
                );
                panUp(
                    (2 * deltaY * targetDistance) / element.clientHeight,
                    scope.object.matrix
                );
            } else if (scope.object.isOrthographicCamera) {
                // orthographic
                panLeft(
                    (deltaX * (scope.object.right - scope.object.left)) /
                        scope.object.zoom /
                        element.clientWidth,
                    scope.object.matrix
                );
                panUp(
                    (deltaY * (scope.object.top - scope.object.bottom)) /
                        scope.object.zoom /
                        element.clientHeight,
                    scope.object.matrix
                );
            } else {
                // camera neither orthographic nor perspective
                console.warn(
                    "WARNING: OrbitControls.js encountered an unknown camera type - pan disabled."
                );
                scope.enablePan = false;
            }
        };
    })();

    function dollyOut(dollyScale) {
        if (scope.object.isPerspectiveCamera) {
            scale /= dollyScale;
        } else if (scope.object.isOrthographicCamera) {
            scope.object.zoom = Math.max(
                scope.minZoom,
                Math.min(scope.maxZoom, scope.object.zoom * dollyScale)
            );
            scope.object.updateProjectionMatrix();
            zoomChanged = true;
        } else {
            console.warn(
                "WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled."
            );
            scope.enableZoom = false;
        }
    }

    function dollyIn(dollyScale) {
        if (scope.object.isPerspectiveCamera) {
            scale *= dollyScale;
        } else if (scope.object.isOrthographicCamera) {
            scope.object.zoom = Math.max(
                scope.minZoom,
                Math.min(scope.maxZoom, scope.object.zoom / dollyScale)
            );
            scope.object.updateProjectionMatrix();
            zoomChanged = true;
        } else {
            console.warn(
                "WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled."
            );
            scope.enableZoom = false;
        }
    }

    //
    // event callbacks - update the object state
    //

    function handleMouseDownRotate(event) {
        rotateStart.set(event.clientX, event.clientY);
    }

    function handleMouseDownDolly(event) {
        dollyStart.set(event.clientX, event.clientY);
    }

    function handleMouseDownPan(event) {
        panStart.set(event.clientX, event.clientY);
    }

    function handleMouseMoveRotate(event) {
        rotateEnd.set(event.clientX, event.clientY);

        rotateDelta
            .subVectors(rotateEnd, rotateStart)
            .multiplyScalar(scope.rotateSpeed);

        var element = scope.domElement;

        rotateLeft((2 * Math.PI * rotateDelta.x) / element.clientHeight); // yes, height

        rotateUp((2 * Math.PI * rotateDelta.y) / element.clientHeight);

        rotateStart.copy(rotateEnd);

        scope.update();
    }

    function handleMouseMoveDolly(event) {
        dollyEnd.set(event.clientX, event.clientY);

        dollyDelta.subVectors(dollyEnd, dollyStart);

        if (dollyDelta.y > 0) {
            dollyOut(getZoomScale());
        } else if (dollyDelta.y < 0) {
            dollyIn(getZoomScale());
        }

        dollyStart.copy(dollyEnd);

        scope.update();
    }

    function handleMouseMovePan(event) {
        panEnd.set(event.clientX, event.clientY);

        panDelta.subVectors(panEnd, panStart).multiplyScalar(scope.panSpeed);

        pan(panDelta.x, panDelta.y);

        panStart.copy(panEnd);

        scope.update();
    }

    function handleMouseUp(/*event*/) {
        // no-op
    }

    function handleMouseWheel(event) {
        //设置相机缩放比数值越大缩放越明显
        let factor = 1;
        //从鼠标位置转化为webgl屏幕坐标位置
        let glScreenX = (event.clientX / scope.domElement.width) * 2 - 1;
        let glScreenY = -(event.clientY / scope.domElement.height) * 2 + 1;
        let vector = new Vector3(glScreenX, glScreenY, 0);
        //从屏幕向量转为3d空间向量
        vector.unproject(scope.object);
        //相机偏移量
        vector.sub(scope.object.position).setLength(factor);
        if (event.deltaY < 0) {
            scope.object.position.add(vector);
            scope.target.add(vector);
        } else {
            scope.object.position.sub(vector);
            scope.target.sub(vector);
        }
        scope.update();
    }

    function handleKeyDown(event) {
        var needsUpdate = false;

        switch (event.keyCode) {
            case scope.keys.UP:
                pan(0, scope.keyPanSpeed);
                needsUpdate = true;
                break;

            case scope.keys.BOTTOM:
                pan(0, -scope.keyPanSpeed);
                needsUpdate = true;
                break;

            case scope.keys.LEFT:
                pan(scope.keyPanSpeed, 0);
                needsUpdate = true;
                break;

            case scope.keys.RIGHT:
                pan(-scope.keyPanSpeed, 0);
                needsUpdate = true;
                break;
        }

        if (needsUpdate) {
            // prevent the browser from scrolling on cursor keys
            event.preventDefault();

            scope.update();
        }
    }

    function handleTouchStartRotate(event) {
        if (event.touches.length == 1) {
            rotateStart.set(event.touches[0].pageX, event.touches[0].pageY);
        } else {
            var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX);
            var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY);

            rotateStart.set(x, y);
        }
    }

    function handleTouchStartPan(event) {
        if (event.touches.length == 1) {
            panStart.set(event.touches[0].pageX, event.touches[0].pageY);
        } else {
            var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX);
            var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY);

            panStart.set(x, y);
        }
    }

    function handleTouchStartDolly(event) {
        var dx = event.touches[0].pageX - event.touches[1].pageX;
        var dy = event.touches[0].pageY - event.touches[1].pageY;

        var distance = Math.sqrt(dx * dx + dy * dy);

        dollyStart.set(0, distance);
    }

    function handleTouchStartDollyPan(event) {
        if (scope.enableZoom) handleTouchStartDolly(event);

        if (scope.enablePan) handleTouchStartPan(event);
    }

    function handleTouchStartDollyRotate(event) {
        if (scope.enableZoom) handleTouchStartDolly(event);

        if (scope.enableRotate) handleTouchStartRotate(event);
    }

    function handleTouchMoveRotate(event) {
        if (event.touches.length == 1) {
            rotateEnd.set(event.touches[0].pageX, event.touches[0].pageY);
        } else {
            var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX);
            var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY);

            rotateEnd.set(x, y);
        }

        rotateDelta
            .subVectors(rotateEnd, rotateStart)
            .multiplyScalar(scope.rotateSpeed);

        var element = scope.domElement;

        rotateLeft((2 * Math.PI * rotateDelta.x) / element.clientHeight); // yes, height

        rotateUp((2 * Math.PI * rotateDelta.y) / element.clientHeight);

        rotateStart.copy(rotateEnd);
    }

    function handleTouchMovePan(event) {
        if (event.touches.length == 1) {
            panEnd.set(event.touches[0].pageX, event.touches[0].pageY);
        } else {
            var x = 0.5 * (event.touches[0].pageX + event.touches[1].pageX);
            var y = 0.5 * (event.touches[0].pageY + event.touches[1].pageY);

            panEnd.set(x, y);
        }

        panDelta.subVectors(panEnd, panStart).multiplyScalar(scope.panSpeed);

        pan(panDelta.x, panDelta.y);

        panStart.copy(panEnd);
    }

    function handleTouchMoveDolly(event) {
        var dx = event.touches[0].pageX - event.touches[1].pageX;
        var dy = event.touches[0].pageY - event.touches[1].pageY;

        var distance = Math.sqrt(dx * dx + dy * dy);

        dollyEnd.set(0, distance);

        dollyDelta.set(0, Math.pow(dollyEnd.y / dollyStart.y, scope.zoomSpeed));

        dollyOut(dollyDelta.y);

        dollyStart.copy(dollyEnd);
    }

    function handleTouchMoveDollyPan(event) {
        if (scope.enableZoom) handleTouchMoveDolly(event);

        if (scope.enablePan) handleTouchMovePan(event);
    }

    function handleTouchMoveDollyRotate(event) {
        if (scope.enableZoom) handleTouchMoveDolly(event);

        if (scope.enableRotate) handleTouchMoveRotate(event);
    }

    function handleTouchEnd(/*event*/) {
        // no-op
    }

    //
    // event handlers - FSM: listen for events and reset state
    //

    function onMouseDown(event) {
        if (scope.enabled === false) return;

        // Prevent the browser from scrolling.
        event.preventDefault();

        // Manually set the focus since calling preventDefault above
        // prevents the browser from setting it automatically.

        scope.domElement.focus ? scope.domElement.focus() : window.focus();

        var mouseAction;

        switch (event.button) {
            case 0:
                mouseAction = scope.mouseButtons.LEFT;
                break;

            case 1:
                mouseAction = scope.mouseButtons.MIDDLE;
                break;

            case 2:
                mouseAction = scope.mouseButtons.RIGHT;
                break;

            default:
                mouseAction = -1;
        }

        switch (mouseAction) {
            case MOUSE.DOLLY:
                if (scope.enableZoom === false) return;

                handleMouseDownDolly(event);

                state = STATE.DOLLY;

                break;

            case MOUSE.ROTATE:
                if (event.ctrlKey || event.metaKey || event.shiftKey) {
                    if (scope.enablePan === false) return;

                    handleMouseDownPan(event);

                    state = STATE.PAN;
                } else {
                    if (scope.enableRotate === false) return;

                    handleMouseDownRotate(event);

                    state = STATE.ROTATE;
                }

                break;

            case MOUSE.PAN:
                if (event.ctrlKey || event.metaKey || event.shiftKey) {
                    if (scope.enableRotate === false) return;

                    handleMouseDownRotate(event);

                    state = STATE.ROTATE;
                } else {
                    if (scope.enablePan === false) return;

                    handleMouseDownPan(event);

                    state = STATE.PAN;
                }

                break;

            default:
                state = STATE.NONE;
        }

        if (state !== STATE.NONE) {
            document.addEventListener("mousemove", onMouseMove, false);
            document.addEventListener("mouseup", onMouseUp, false);

            scope.dispatchEvent(startEvent);
        }
    }

    function onMouseMove(event) {
        if (scope.enabled === false) return;

        event.preventDefault();

        switch (state) {
            case STATE.ROTATE:
                if (scope.enableRotate === false) return;

                handleMouseMoveRotate(event);

                break;

            case STATE.DOLLY:
                if (scope.enableZoom === false) return;

                handleMouseMoveDolly(event);

                break;

            case STATE.PAN:
                if (scope.enablePan === false) return;

                handleMouseMovePan(event);

                break;
        }
    }

    function onMouseUp(event) {
        if (scope.enabled === false) return;

        handleMouseUp(event);

        document.removeEventListener("mousemove", onMouseMove, false);
        document.removeEventListener("mouseup", onMouseUp, false);

        scope.dispatchEvent(endEvent);

        state = STATE.NONE;
    }

    function onMouseWheel(event) {
        if (
            scope.enabled === false ||
            scope.enableZoom === false ||
            (state !== STATE.NONE && state !== STATE.ROTATE)
        )
            return;

        event.preventDefault();
        event.stopPropagation();

        scope.dispatchEvent(startEvent);

        handleMouseWheel(event);

        scope.dispatchEvent(endEvent);
    }

    function onKeyDown(event) {
        if (
            scope.enabled === false ||
            scope.enableKeys === false ||
            scope.enablePan === false
        )
            return;

        handleKeyDown(event);
    }

    function onTouchStart(event) {
        if (scope.enabled === false) return;

        event.preventDefault(); // prevent scrolling

        switch (event.touches.length) {
            case 1:
                switch (scope.touches.ONE) {
                    case TOUCH.ROTATE:
                        if (scope.enableRotate === false) return;

                        handleTouchStartRotate(event);

                        state = STATE.TOUCH_ROTATE;

                        break;

                    case TOUCH.PAN:
                        if (scope.enablePan === false) return;

                        handleTouchStartPan(event);

                        state = STATE.TOUCH_PAN;

                        break;

                    default:
                        state = STATE.NONE;
                }

                break;

            case 2:
                switch (scope.touches.TWO) {
                    case TOUCH.DOLLY_PAN:
                        if (
                            scope.enableZoom === false &&
                            scope.enablePan === false
                        )
                            return;

                        handleTouchStartDollyPan(event);

                        state = STATE.TOUCH_DOLLY_PAN;

                        break;

                    case TOUCH.DOLLY_ROTATE:
                        if (
                            scope.enableZoom === false &&
                            scope.enableRotate === false
                        )
                            return;

                        handleTouchStartDollyRotate(event);

                        state = STATE.TOUCH_DOLLY_ROTATE;

                        break;

                    default:
                        state = STATE.NONE;
                }

                break;

            default:
                state = STATE.NONE;
        }

        if (state !== STATE.NONE) {
            scope.dispatchEvent(startEvent);
        }
    }

    function onTouchMove(event) {
        if (scope.enabled === false) return;

        event.preventDefault(); // prevent scrolling
        event.stopPropagation();

        switch (state) {
            case STATE.TOUCH_ROTATE:
                if (scope.enableRotate === false) return;

                handleTouchMoveRotate(event);

                scope.update();

                break;

            case STATE.TOUCH_PAN:
                if (scope.enablePan === false) return;

                handleTouchMovePan(event);

                scope.update();

                break;

            case STATE.TOUCH_DOLLY_PAN:
                if (scope.enableZoom === false && scope.enablePan === false)
                    return;

                handleTouchMoveDollyPan(event);

                scope.update();

                break;

            case STATE.TOUCH_DOLLY_ROTATE:
                if (scope.enableZoom === false && scope.enableRotate === false)
                    return;

                handleTouchMoveDollyRotate(event);

                scope.update();

                break;

            default:
                state = STATE.NONE;
        }
    }

    function onTouchEnd(event) {
        if (scope.enabled === false) return;

        handleTouchEnd(event);

        scope.dispatchEvent(endEvent);

        state = STATE.NONE;
    }

    function onContextMenu(event) {
        if (scope.enabled === false) return;

        event.preventDefault();
    }

    //

    scope.domElement.addEventListener("contextmenu", onContextMenu, false);

    scope.domElement.addEventListener("mousedown", onMouseDown, false);
    scope.domElement.addEventListener("wheel", onMouseWheel, false);

    scope.domElement.addEventListener("touchstart", onTouchStart, false);
    scope.domElement.addEventListener("touchend", onTouchEnd, false);
    scope.domElement.addEventListener("touchmove", onTouchMove, false);

    scope.domElement.addEventListener("keydown", onKeyDown, false);

    // make sure element can receive keys.

    if (scope.domElement.tabIndex === -1) {
        scope.domElement.tabIndex = 0;
    }

    // force an update at start

    this.update();
}

OrbitControls = function ( object, domElement ) {

	if ( domElement === undefined ) console.warn( 'THREE.OrbitControls: The second parameter "domElement" is now mandatory.' );
	if ( domElement === document ) console.error( 'THREE.OrbitControls: "document" should not be used as the target "domElement". Please use "renderer.domElement" instead.' );

	this.object = object;
	this.domElement = domElement;

	// Set to false to disable this control
	this.enabled = true;

	// "target" sets the location of focus, where the object orbits around
	this.target = new Vector3();

	// How far you can dolly in and out ( PerspectiveCamera only )
	this.minDistance = 0;
	this.maxDistance = Infinity;

	// How far you can zoom in and out ( OrthographicCamera only )
	this.minZoom = 0;
	this.maxZoom = Infinity;

	// How far you can orbit vertically, upper and lower limits.
	// Range is 0 to Math.PI radians.
	this.minPolarAngle = 0; // radians
	this.maxPolarAngle = Math.PI; // radians

	// How far you can orbit horizontally, upper and lower limits.
	// If set, must be a sub-interval of the interval [ - Math.PI, Math.PI ].
	this.minAzimuthAngle = - Infinity; // radians
	this.maxAzimuthAngle = Infinity; // radians

	// Set to true to enable damping (inertia)
	// If damping is enabled, you must call controls.update() in your animation loop
	this.enableDamping = false;
	this.dampingFactor = 0.05;

	// This option actually enables dollying in and out; left as "zoom" for backwards compatibility.
	// Set to false to disable zooming
	this.enableZoom = true;
	this.zoomSpeed = 1.0;

	// Set to false to disable rotating
	this.enableRotate = true;
	this.rotateSpeed = 1.0;

	// Set to false to disable panning
	this.enablePan = true;
	this.panSpeed = 1.0;
	this.screenSpacePanning = false; // if true, pan in screen-space
	this.keyPanSpeed = 7.0;	// pixels moved per arrow key push

	// Set to true to automatically rotate around the target
	// If auto-rotate is enabled, you must call controls.update() in your animation loop
	this.autoRotate = false;
	this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60

	// Set to false to disable use of the keys
	this.enableKeys = true;

	// The four arrow keys
	this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 };

	// Mouse buttons
	this.mouseButtons = { LEFT: MOUSE.ROTATE, MIDDLE: MOUSE.DOLLY, RIGHT: MOUSE.PAN };

	// Touch fingers
	this.touches = { ONE: TOUCH.ROTATE, TWO: TOUCH.DOLLY_PAN };

	// for reset
	this.target0 = this.target.clone();
	this.position0 = this.object.position.clone();
	this.zoom0 = this.object.zoom;

	//
	// public methods
	//

	this.getPolarAngle = function () {

		return spherical.phi;

	};

	this.getAzimuthalAngle = function () {

		return spherical.theta;

	};

	this.saveState = function () {

		scope.target0.copy( scope.target );
		scope.position0.copy( scope.object.position );
		scope.zoom0 = scope.object.zoom;

	};

	this.reset = function () {

		scope.target.copy( scope.target0 );
		scope.object.position.copy( scope.position0 );
		scope.object.zoom = scope.zoom0;

		scope.object.updateProjectionMatrix();
		scope.dispatchEvent( changeEvent );

		scope.update();

		state = STATE.NONE;

	};

	// this method is exposed, but perhaps it would be better if we can make it private...
	this.update = function () {

		var offset = new Vector3();

		// so camera.up is the orbit axis
		var quat = new Quaternion().setFromUnitVectors( object.up, new Vector3( 0, 1, 0 ) );
		var quatInverse = quat.clone().inverse();

		var lastPosition = new Vector3();
		var lastQuaternion = new Quaternion();

		return function update() {

			var position = scope.object.position;

			offset.copy( position ).sub( scope.target );

			// rotate offset to "y-axis-is-up" space
			offset.applyQuaternion( quat );

			// angle from z-axis around y-axis
			spherical.setFromVector3( offset );

			if ( scope.autoRotate && state === STATE.NONE ) {

				rotateLeft( getAutoRotationAngle() );

			}

			if ( scope.enableDamping ) {

				spherical.theta += sphericalDelta.theta * scope.dampingFactor;
				spherical.phi += sphericalDelta.phi * scope.dampingFactor;

			} else {

				spherical.theta += sphericalDelta.theta;
				spherical.phi += sphericalDelta.phi;

			}

			// restrict theta to be between desired limits
			spherical.theta = Math.max( scope.minAzimuthAngle, Math.min( scope.maxAzimuthAngle, spherical.theta ) );

			// restrict phi to be between desired limits
			spherical.phi = Math.max( scope.minPolarAngle, Math.min( scope.maxPolarAngle, spherical.phi ) );

			spherical.makeSafe();


			spherical.radius *= scale;

			// restrict radius to be between desired limits
			spherical.radius = Math.max( scope.minDistance, Math.min( scope.maxDistance, spherical.radius ) );

			// move target to panned location

			if ( scope.enableDamping === true ) {

				scope.target.addScaledVector( panOffset, scope.dampingFactor );

			} else {

				scope.target.add( panOffset );

			}

			offset.setFromSpherical( spherical );

			// rotate offset back to "camera-up-vector-is-up" space
			offset.applyQuaternion( quatInverse );

			position.copy( scope.target ).add( offset );

			scope.object.lookAt( scope.target );

			if ( scope.enableDamping === true ) {

				sphericalDelta.theta *= ( 1 - scope.dampingFactor );
				sphericalDelta.phi *= ( 1 - scope.dampingFactor );

				panOffset.multiplyScalar( 1 - scope.dampingFactor );

			} else {

				sphericalDelta.set( 0, 0, 0 );

				panOffset.set( 0, 0, 0 );

			}

			scale = 1;

			// update condition is:
			// min(camera displacement, camera rotation in radians)^2 > EPS
			// using small-angle approximation cos(x/2) = 1 - x^2 / 8

			if ( zoomChanged ||
				lastPosition.distanceToSquared( scope.object.position ) > EPS ||
				8 * ( 1 - lastQuaternion.dot( scope.object.quaternion ) ) > EPS ) {

				scope.dispatchEvent( changeEvent );

				lastPosition.copy( scope.object.position );
				lastQuaternion.copy( scope.object.quaternion );
				zoomChanged = false;

				return true;

			}

			return false;

		};

	}();

	this.dispose = function () {

		scope.domElement.removeEventListener( 'contextmenu', onContextMenu, false );
		scope.domElement.removeEventListener( 'mousedown', onMouseDown, false );
		scope.domElement.removeEventListener( 'wheel', onMouseWheel, false );

		scope.domElement.removeEventListener( 'touchstart', onTouchStart, false );
		scope.domElement.removeEventListener( 'touchend', onTouchEnd, false );
		scope.domElement.removeEventListener( 'touchmove', onTouchMove, false );

		document.removeEventListener( 'mousemove', onMouseMove, false );
		document.removeEventListener( 'mouseup', onMouseUp, false );

		scope.domElement.removeEventListener( 'keydown', onKeyDown, false );

		//scope.dispatchEvent( { type: 'dispose' } ); // should this be added here?

	};

	//
	// internals
	//

	var scope = this;

	var changeEvent = { type: 'change' };
	var startEvent = { type: 'start' };
	var endEvent = { type: 'end' };

	var STATE = {
		NONE: - 1,
		ROTATE: 0,
		DOLLY: 1,
		PAN: 2,
		TOUCH_ROTATE: 3,
		TOUCH_PAN: 4,
		TOUCH_DOLLY_PAN: 5,
		TOUCH_DOLLY_ROTATE: 6
	};

	var state = STATE.NONE;

	var EPS = 0.000001;

	// current position in spherical coordinates
	var spherical = new Spherical();
	var sphericalDelta = new Spherical();

	var scale = 1;
	var panOffset = new Vector3();
	var zoomChanged = false;

	var rotateStart = new Vector2();
	var rotateEnd = new Vector2();
	var rotateDelta = new Vector2();

	var panStart = new Vector2();
	var panEnd = new Vector2();
	var panDelta = new Vector2();

	var dollyStart = new Vector2();
	var dollyEnd = new Vector2();
	var dollyDelta = new Vector2();

	function getAutoRotationAngle() {

		return 2 * Math.PI / 60 / 60 * scope.autoRotateSpeed;

	}

	function getZoomScale() {

		return Math.pow( 0.95, scope.zoomSpeed );

	}

	function rotateLeft( angle ) {

		sphericalDelta.theta -= angle;

	}

	function rotateUp( angle ) {

		sphericalDelta.phi -= angle;

	}

	var panLeft = function () {

		var v = new Vector3();

		return function panLeft( distance, objectMatrix ) {

			v.setFromMatrixColumn( objectMatrix, 0 ); // get X column of objectMatrix
			v.multiplyScalar( - distance );

			panOffset.add( v );

		};

	}();

	var panUp = function () {

		var v = new Vector3();

		return function panUp( distance, objectMatrix ) {

			if ( scope.screenSpacePanning === true ) {

				v.setFromMatrixColumn( objectMatrix, 1 );

			} else {

				v.setFromMatrixColumn( objectMatrix, 0 );
				v.crossVectors( scope.object.up, v );

			}

			v.multiplyScalar( distance );

			panOffset.add( v );

		};

	}();

	// deltaX and deltaY are in pixels; right and down are positive
	var pan = function () {

		var offset = new Vector3();

		return function pan( deltaX, deltaY ) {

			var element = scope.domElement;

			if ( scope.object.isPerspectiveCamera ) {

				// perspective
				var position = scope.object.position;
				offset.copy( position ).sub( scope.target );
				var targetDistance = offset.length();

				// half of the fov is center to top of screen
				targetDistance *= Math.tan( ( scope.object.fov / 2 ) * Math.PI / 180.0 );

				// we use only clientHeight here so aspect ratio does not distort speed
				panLeft( 2 * deltaX * targetDistance / element.clientHeight, scope.object.matrix );
				panUp( 2 * deltaY * targetDistance / element.clientHeight, scope.object.matrix );

			} else if ( scope.object.isOrthographicCamera ) {

				// orthographic
				panLeft( deltaX * ( scope.object.right - scope.object.left ) / scope.object.zoom / element.clientWidth, scope.object.matrix );
				panUp( deltaY * ( scope.object.top - scope.object.bottom ) / scope.object.zoom / element.clientHeight, scope.object.matrix );

			} else {

				// camera neither orthographic nor perspective
				console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - pan disabled.' );
				scope.enablePan = false;

			}

		};

	}();

	function dollyOut( dollyScale ) {

		if ( scope.object.isPerspectiveCamera ) {

			scale /= dollyScale;

		} else if ( scope.object.isOrthographicCamera ) {

			scope.object.zoom = Math.max( scope.minZoom, Math.min( scope.maxZoom, scope.object.zoom * dollyScale ) );
			scope.object.updateProjectionMatrix();
			zoomChanged = true;

		} else {

			console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.' );
			scope.enableZoom = false;

		}

	}

	function dollyIn( dollyScale ) {

		if ( scope.object.isPerspectiveCamera ) {

			scale *= dollyScale;

		} else if ( scope.object.isOrthographicCamera ) {

			scope.object.zoom = Math.max( scope.minZoom, Math.min( scope.maxZoom, scope.object.zoom / dollyScale ) );
			scope.object.updateProjectionMatrix();
			zoomChanged = true;

		} else {

			console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.' );
			scope.enableZoom = false;

		}

	}

	//
	// event callbacks - update the object state
	//

	function handleMouseDownRotate( event ) {

		rotateStart.set( event.clientX, event.clientY );

	}

	function handleMouseDownDolly( event ) {

		dollyStart.set( event.clientX, event.clientY );

	}

	function handleMouseDownPan( event ) {

		panStart.set( event.clientX, event.clientY );

	}

	function handleMouseMoveRotate( event ) {

		rotateEnd.set( event.clientX, event.clientY );

		rotateDelta.subVectors( rotateEnd, rotateStart ).multiplyScalar( scope.rotateSpeed );

		var element = scope.domElement;

		rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientHeight ); // yes, height

		rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight );

		rotateStart.copy( rotateEnd );

		scope.update();

	}

	function handleMouseMoveDolly( event ) {

		dollyEnd.set( event.clientX, event.clientY );

		dollyDelta.subVectors( dollyEnd, dollyStart );

		if ( dollyDelta.y > 0 ) {

			dollyOut( getZoomScale() );

		} else if ( dollyDelta.y < 0 ) {

			dollyIn( getZoomScale() );

		}

		dollyStart.copy( dollyEnd );

		scope.update();

	}

	function handleMouseMovePan( event ) {

		panEnd.set( event.clientX, event.clientY );

		panDelta.subVectors( panEnd, panStart ).multiplyScalar( scope.panSpeed );

		pan( panDelta.x, panDelta.y );

		panStart.copy( panEnd );

		scope.update();

	}

	function handleMouseUp( /*event*/ ) {

		// no-op

	}

	function handleMouseWheel( event ) {
		//设置相机缩放比数值越大缩放越明显
		let factor = 15;
		//从鼠标位置转化为webgl屏幕坐标位置
		let glScreenX = (event.clientX / scope.domElement.width) * 2 - 1;
		let glScreenY = -(event.clientY / scope.domElement.height) * 2 + 1;
		let vector = new Vector3(glScreenX, glScreenY, 0);
		//从屏幕向量转为3d空间向量
		vector.unproject(scope.object);
		//相机偏移量
		vector.sub(scope.object.position).setLength(factor);
		if (event.deltaY < 0) {
			scope.object.position.add(vector);
			scope.target.add(vector);
		} else {
			scope.object.position.sub( vector);
			scope.target.sub(vector);
		}
		scope.update();

	}

	function handleKeyDown( event ) {

		var needsUpdate = false;

		switch ( event.keyCode ) {

			case scope.keys.UP:
				pan( 0, scope.keyPanSpeed );
				needsUpdate = true;
				break;

			case scope.keys.BOTTOM:
				pan( 0, - scope.keyPanSpeed );
				needsUpdate = true;
				break;

			case scope.keys.LEFT:
				pan( scope.keyPanSpeed, 0 );
				needsUpdate = true;
				break;

			case scope.keys.RIGHT:
				pan( - scope.keyPanSpeed, 0 );
				needsUpdate = true;
				break;

		}

		if ( needsUpdate ) {

			// prevent the browser from scrolling on cursor keys
			event.preventDefault();

			scope.update();

		}


	}

	function handleTouchStartRotate( event ) {

		if ( event.touches.length == 1 ) {

			rotateStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

		} else {

			var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
			var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );

			rotateStart.set( x, y );

		}

	}

	function handleTouchStartPan( event ) {

		if ( event.touches.length == 1 ) {

			panStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

		} else {

			var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
			var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );

			panStart.set( x, y );

		}

	}

	function handleTouchStartDolly( event ) {

		var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
		var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;

		var distance = Math.sqrt( dx * dx + dy * dy );

		dollyStart.set( 0, distance );

	}

	function handleTouchStartDollyPan( event ) {

		if ( scope.enableZoom ) handleTouchStartDolly( event );

		if ( scope.enablePan ) handleTouchStartPan( event );

	}

	function handleTouchStartDollyRotate( event ) {

		if ( scope.enableZoom ) handleTouchStartDolly( event );

		if ( scope.enableRotate ) handleTouchStartRotate( event );

	}

	function handleTouchMoveRotate( event ) {

		if ( event.touches.length == 1 ) {

			rotateEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

		} else {

			var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
			var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );

			rotateEnd.set( x, y );

		}

		rotateDelta.subVectors( rotateEnd, rotateStart ).multiplyScalar( scope.rotateSpeed );

		var element = scope.domElement;

		rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientHeight ); // yes, height

		rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight );

		rotateStart.copy( rotateEnd );

	}

	function handleTouchMovePan( event ) {

		if ( event.touches.length == 1 ) {

			panEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

		} else {

			var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
			var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );

			panEnd.set( x, y );

		}

		panDelta.subVectors( panEnd, panStart ).multiplyScalar( scope.panSpeed );

		pan( panDelta.x, panDelta.y );

		panStart.copy( panEnd );

	}

	function handleTouchMoveDolly( event ) {

		var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
		var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;

		var distance = Math.sqrt( dx * dx + dy * dy );

		dollyEnd.set( 0, distance );

		dollyDelta.set( 0, Math.pow( dollyEnd.y / dollyStart.y, scope.zoomSpeed ) );

		dollyOut( dollyDelta.y );

		dollyStart.copy( dollyEnd );

	}

	function handleTouchMoveDollyPan( event ) {

		if ( scope.enableZoom ) handleTouchMoveDolly( event );

		if ( scope.enablePan ) handleTouchMovePan( event );

	}

	function handleTouchMoveDollyRotate( event ) {

		if ( scope.enableZoom ) handleTouchMoveDolly( event );

		if ( scope.enableRotate ) handleTouchMoveRotate( event );

	}

	function handleTouchEnd( /*event*/ ) {

		// no-op

	}

	//
	// event handlers - FSM: listen for events and reset state
	//

	function onMouseDown( event ) {

		if ( scope.enabled === false ) return;

		// Prevent the browser from scrolling.
		event.preventDefault();

		// Manually set the focus since calling preventDefault above
		// prevents the browser from setting it automatically.

		scope.domElement.focus ? scope.domElement.focus() : window.focus();

		var mouseAction;

		switch ( event.button ) {

			case 0:

				mouseAction = scope.mouseButtons.LEFT;
				break;

			case 1:

				mouseAction = scope.mouseButtons.MIDDLE;
				break;

			case 2:

				mouseAction = scope.mouseButtons.RIGHT;
				break;

			default:

				mouseAction = - 1;

		}

		switch ( mouseAction ) {

			case MOUSE.DOLLY:

				if ( scope.enableZoom === false ) return;

				handleMouseDownDolly( event );

				state = STATE.DOLLY;

				break;

			case MOUSE.ROTATE:

				if ( event.ctrlKey || event.metaKey || event.shiftKey ) {

					if ( scope.enablePan === false ) return;

					handleMouseDownPan( event );

					state = STATE.PAN;

				} else {

					if ( scope.enableRotate === false ) return;

					handleMouseDownRotate( event );

					state = STATE.ROTATE;

				}

				break;

			case MOUSE.PAN:

				if ( event.ctrlKey || event.metaKey || event.shiftKey ) {

					if ( scope.enableRotate === false ) return;

					handleMouseDownRotate( event );

					state = STATE.ROTATE;

				} else {

					if ( scope.enablePan === false ) return;

					handleMouseDownPan( event );

					state = STATE.PAN;

				}

				break;

			default:

				state = STATE.NONE;

		}

		if ( state !== STATE.NONE ) {

			document.addEventListener( 'mousemove', onMouseMove, false );
			document.addEventListener( 'mouseup', onMouseUp, false );

			scope.dispatchEvent( startEvent );

		}

	}

	function onMouseMove( event ) {

		if ( scope.enabled === false ) return;

		event.preventDefault();

		switch ( state ) {

			case STATE.ROTATE:

				if ( scope.enableRotate === false ) return;

				handleMouseMoveRotate( event );

				break;

			case STATE.DOLLY:

				if ( scope.enableZoom === false ) return;

				handleMouseMoveDolly( event );

				break;

			case STATE.PAN:

				if ( scope.enablePan === false ) return;

				handleMouseMovePan( event );

				break;

		}

	}

	function onMouseUp( event ) {

		if ( scope.enabled === false ) return;

		handleMouseUp( event );

		document.removeEventListener( 'mousemove', onMouseMove, false );
		document.removeEventListener( 'mouseup', onMouseUp, false );

		scope.dispatchEvent( endEvent );

		state = STATE.NONE;

	}

	function onMouseWheel( event ) {

		if ( scope.enabled === false || scope.enableZoom === false || ( state !== STATE.NONE && state !== STATE.ROTATE ) ) return;

		event.preventDefault();
		event.stopPropagation();

		scope.dispatchEvent( startEvent );

		handleMouseWheel( event );

		scope.dispatchEvent( endEvent );

	}

	function onKeyDown( event ) {

		if ( scope.enabled === false || scope.enableKeys === false || scope.enablePan === false ) return;

		handleKeyDown( event );

	}

	function onTouchStart( event ) {

		if ( scope.enabled === false ) return;

		event.preventDefault(); // prevent scrolling

		switch ( event.touches.length ) {

			case 1:

				switch ( scope.touches.ONE ) {

					case TOUCH.ROTATE:

						if ( scope.enableRotate === false ) return;

						handleTouchStartRotate( event );

						state = STATE.TOUCH_ROTATE;

						break;

					case TOUCH.PAN:

						if ( scope.enablePan === false ) return;

						handleTouchStartPan( event );

						state = STATE.TOUCH_PAN;

						break;

					default:

						state = STATE.NONE;

				}

				break;

			case 2:

				switch ( scope.touches.TWO ) {

					case TOUCH.DOLLY_PAN:

						if ( scope.enableZoom === false && scope.enablePan === false ) return;

						handleTouchStartDollyPan( event );

						state = STATE.TOUCH_DOLLY_PAN;

						break;

					case TOUCH.DOLLY_ROTATE:

						if ( scope.enableZoom === false && scope.enableRotate === false ) return;

						handleTouchStartDollyRotate( event );

						state = STATE.TOUCH_DOLLY_ROTATE;

						break;

					default:

						state = STATE.NONE;

				}

				break;

			default:

				state = STATE.NONE;

		}

		if ( state !== STATE.NONE ) {

			scope.dispatchEvent( startEvent );

		}

	}

	function onTouchMove( event ) {

		if ( scope.enabled === false ) return;

		event.preventDefault(); // prevent scrolling
		event.stopPropagation();

		switch ( state ) {

			case STATE.TOUCH_ROTATE:

				if ( scope.enableRotate === false ) return;

				handleTouchMoveRotate( event );

				scope.update();

				break;

			case STATE.TOUCH_PAN:

				if ( scope.enablePan === false ) return;

				handleTouchMovePan( event );

				scope.update();

				break;

			case STATE.TOUCH_DOLLY_PAN:

				if ( scope.enableZoom === false && scope.enablePan === false ) return;

				handleTouchMoveDollyPan( event );

				scope.update();

				break;

			case STATE.TOUCH_DOLLY_ROTATE:

				if ( scope.enableZoom === false && scope.enableRotate === false ) return;

				handleTouchMoveDollyRotate( event );

				scope.update();

				break;

			default:

				state = STATE.NONE;

		}

	}

	function onTouchEnd( event ) {

		if ( scope.enabled === false ) return;

		handleTouchEnd( event );

		scope.dispatchEvent( endEvent );

		state = STATE.NONE;

	}

	function onContextMenu( event ) {

		if ( scope.enabled === false ) return;

		event.preventDefault();

	}

	//

	scope.domElement.addEventListener( 'contextmenu', onContextMenu, false );

	scope.domElement.addEventListener( 'mousedown', onMouseDown, false );
	scope.domElement.addEventListener( 'wheel', onMouseWheel, false );

	scope.domElement.addEventListener( 'touchstart', onTouchStart, false );
	scope.domElement.addEventListener( 'touchend', onTouchEnd, false );
	scope.domElement.addEventListener( 'touchmove', onTouchMove, false );

	scope.domElement.addEventListener( 'keydown', onKeyDown, false );

	// make sure element can receive keys.

	if ( scope.domElement.tabIndex === - 1 ) {

		scope.domElement.tabIndex = 0;

	}

	// force an update at start

	this.update();

}

OrbitControls = function ( object, domElement ) {

	if ( domElement === undefined ) console.warn( 'THREE.OrbitControls: The second parameter "domElement" is now mandatory.' );
	if ( domElement === document ) console.error( 'THREE.OrbitControls: "document" should not be used as the target "domElement". Please use "renderer.domElement" instead.' );

	this.object = object;
	this.domElement = domElement;

	// Set to false to disable this control
	this.enabled = true;

	// "target" sets the location of focus, where the object orbits around
	this.target = new Vector3();

	// How far you can dolly in and out ( PerspectiveCamera only )
	this.minDistance = 0;
	this.maxDistance = Infinity;

	// How far you can zoom in and out ( OrthographicCamera only )
	this.minZoom = 0;
	this.maxZoom = Infinity;

	// How far you can orbit vertically, upper and lower limits.
	// Range is 0 to Math.PI radians.
	this.minPolarAngle = 0; // radians
	this.maxPolarAngle = Math.PI; // radians

	// How far you can orbit horizontally, upper and lower limits.
	// If set, must be a sub-interval of the interval [ - Math.PI, Math.PI ].
	this.minAzimuthAngle = - Infinity; // radians
	this.maxAzimuthAngle = Infinity; // radians

	// Set to true to enable damping (inertia)
	// If damping is enabled, you must call controls.update() in your animation loop
	this.enableDamping = false;
	this.dampingFactor = 0.05;

	// This option actually enables dollying in and out; left as "zoom" for backwards compatibility.
	// Set to false to disable zooming
	this.enableZoom = true;
	this.zoomSpeed = 1.0;

	// Set to false to disable rotating
	this.enableRotate = true;
	this.rotateSpeed = 1.0;

	// Set to false to disable panning
	this.enablePan = true;
	this.panSpeed = 1.0;
	this.screenSpacePanning = false; // if true, pan in screen-space
	this.keyPanSpeed = 7.0;	// pixels moved per arrow key push

	// Set to true to automatically rotate around the target
	// If auto-rotate is enabled, you must call controls.update() in your animation loop
	this.autoRotate = false;
	this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60

	// Set to false to disable use of the keys
	this.enableKeys = true;

	// The four arrow keys
	this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 };

	// Mouse buttons
	this.mouseButtons = { LEFT: MOUSE.ROTATE, MIDDLE: MOUSE.DOLLY, RIGHT: MOUSE.PAN };

	// Touch fingers
	this.touches = { ONE: TOUCH.ROTATE, TWO: TOUCH.DOLLY_PAN };

	// for reset
	this.target0 = this.target.clone();
	this.position0 = this.object.position.clone();
	this.zoom0 = this.object.zoom;

	//
	// public methods
	//

	this.getPolarAngle = function () {

		return spherical.phi;

	};

	this.getAzimuthalAngle = function () {

		return spherical.theta;

	};

	this.saveState = function () {

		scope.target0.copy( scope.target );
		scope.position0.copy( scope.object.position );
		scope.zoom0 = scope.object.zoom;

	};

	this.reset = function () {

		scope.target.copy( scope.target0 );
		scope.object.position.copy( scope.position0 );
		scope.object.zoom = scope.zoom0;

		scope.object.updateProjectionMatrix();
		scope.dispatchEvent( changeEvent );

		scope.update();

		state = STATE.NONE;

	};

	// this method is exposed, but perhaps it would be better if we can make it private...
	this.update = function () {

		var offset = new Vector3();

		// so camera.up is the orbit axis
		var quat = new Quaternion().setFromUnitVectors( object.up, new Vector3( 0, 1, 0 ) );
		var quatInverse = quat.clone().inverse();

		var lastPosition = new Vector3();
		var lastQuaternion = new Quaternion();

		return function update() {

			var position = scope.object.position;

			offset.copy( position ).sub( scope.target );

			// rotate offset to "y-axis-is-up" space
			offset.applyQuaternion( quat );

			// angle from z-axis around y-axis
			spherical.setFromVector3( offset );

			if ( scope.autoRotate && state === STATE.NONE ) {

				rotateLeft( getAutoRotationAngle() );

			}

			if ( scope.enableDamping ) {

				spherical.theta += sphericalDelta.theta * scope.dampingFactor;
				spherical.phi += sphericalDelta.phi * scope.dampingFactor;

			} else {

				spherical.theta += sphericalDelta.theta;
				spherical.phi += sphericalDelta.phi;

			}

			// restrict theta to be between desired limits
			spherical.theta = Math.max( scope.minAzimuthAngle, Math.min( scope.maxAzimuthAngle, spherical.theta ) );

			// restrict phi to be between desired limits
			spherical.phi = Math.max( scope.minPolarAngle, Math.min( scope.maxPolarAngle, spherical.phi ) );

			spherical.makeSafe();


			spherical.radius *= scale;

			// restrict radius to be between desired limits
			spherical.radius = Math.max( scope.minDistance, Math.min( scope.maxDistance, spherical.radius ) );

			// move target to panned location

			if ( scope.enableDamping === true ) {

				scope.target.addScaledVector( panOffset, scope.dampingFactor );

			} else {

				scope.target.add( panOffset );

			}

			offset.setFromSpherical( spherical );

			// rotate offset back to "camera-up-vector-is-up" space
			offset.applyQuaternion( quatInverse );

			position.copy( scope.target ).add( offset );

			scope.object.lookAt( scope.target );

			if ( scope.enableDamping === true ) {

				sphericalDelta.theta *= ( 1 - scope.dampingFactor );
				sphericalDelta.phi *= ( 1 - scope.dampingFactor );

				panOffset.multiplyScalar( 1 - scope.dampingFactor );

			} else {

				sphericalDelta.set( 0, 0, 0 );

				panOffset.set( 0, 0, 0 );

			}

			scale = 1;

			// update condition is:
			// min(camera displacement, camera rotation in radians)^2 > EPS
			// using small-angle approximation cos(x/2) = 1 - x^2 / 8

			if ( zoomChanged ||
				lastPosition.distanceToSquared( scope.object.position ) > EPS ||
				8 * ( 1 - lastQuaternion.dot( scope.object.quaternion ) ) > EPS ) {

				scope.dispatchEvent( changeEvent );

				lastPosition.copy( scope.object.position );
				lastQuaternion.copy( scope.object.quaternion );
				zoomChanged = false;

				return true;

			}

			return false;

		};

	}();

	this.dispose = function () {

		scope.domElement.removeEventListener( 'contextmenu', onContextMenu, false );
		scope.domElement.removeEventListener( 'mousedown', onMouseDown, false );
		scope.domElement.removeEventListener( 'wheel', onMouseWheel, false );

		scope.domElement.removeEventListener( 'touchstart', onTouchStart, false );
		scope.domElement.removeEventListener( 'touchend', onTouchEnd, false );
		scope.domElement.removeEventListener( 'touchmove', onTouchMove, false );

		document.removeEventListener( 'mousemove', onMouseMove, false );
		document.removeEventListener( 'mouseup', onMouseUp, false );

		scope.domElement.removeEventListener( 'keydown', onKeyDown, false );

		//scope.dispatchEvent( { type: 'dispose' } ); // should this be added here?

	};

	//
	// internals
	//

	var scope = this;

	var changeEvent = { type: 'change' };
	var startEvent = { type: 'start' };
	var endEvent = { type: 'end' };

	var STATE = {
		NONE: - 1,
		ROTATE: 0,
		DOLLY: 1,
		PAN: 2,
		TOUCH_ROTATE: 3,
		TOUCH_PAN: 4,
		TOUCH_DOLLY_PAN: 5,
		TOUCH_DOLLY_ROTATE: 6
	};

	var state = STATE.NONE;

	var EPS = 0.000001;

	// current position in spherical coordinates
	var spherical = new Spherical();
	var sphericalDelta = new Spherical();

	var scale = 1;
	var panOffset = new Vector3();
	var zoomChanged = false;

	var rotateStart = new Vector2();
	var rotateEnd = new Vector2();
	var rotateDelta = new Vector2();

	var panStart = new Vector2();
	var panEnd = new Vector2();
	var panDelta = new Vector2();

	var dollyStart = new Vector2();
	var dollyEnd = new Vector2();
	var dollyDelta = new Vector2();

	function getAutoRotationAngle() {

		return 2 * Math.PI / 60 / 60 * scope.autoRotateSpeed;

	}

	function getZoomScale() {

		return Math.pow( 0.95, scope.zoomSpeed );

	}

	function rotateLeft( angle ) {

		sphericalDelta.theta -= angle;

	}

	function rotateUp( angle ) {

		sphericalDelta.phi -= angle;

	}

	var panLeft = function () {

		var v = new Vector3();

		return function panLeft( distance, objectMatrix ) {

			v.setFromMatrixColumn( objectMatrix, 0 ); // get X column of objectMatrix
			v.multiplyScalar( - distance );

			panOffset.add( v );

		};

	}();

	var panUp = function () {

		var v = new Vector3();

		return function panUp( distance, objectMatrix ) {

			if ( scope.screenSpacePanning === true ) {

				v.setFromMatrixColumn( objectMatrix, 1 );

			} else {

				v.setFromMatrixColumn( objectMatrix, 0 );
				v.crossVectors( scope.object.up, v );

			}

			v.multiplyScalar( distance );

			panOffset.add( v );

		};

	}();

	// deltaX and deltaY are in pixels; right and down are positive
	var pan = function () {

		var offset = new Vector3();

		return function pan( deltaX, deltaY ) {

			var element = scope.domElement;

			if ( scope.object.isPerspectiveCamera ) {

				// perspective
				var position = scope.object.position;
				offset.copy( position ).sub( scope.target );
				var targetDistance = offset.length();

				// half of the fov is center to top of screen
				targetDistance *= Math.tan( ( scope.object.fov / 2 ) * Math.PI / 180.0 );

				// we use only clientHeight here so aspect ratio does not distort speed
				panLeft( 2 * deltaX * targetDistance / element.clientHeight, scope.object.matrix );
				panUp( 2 * deltaY * targetDistance / element.clientHeight, scope.object.matrix );

			} else if ( scope.object.isOrthographicCamera ) {

				// orthographic
				panLeft( deltaX * ( scope.object.right - scope.object.left ) / scope.object.zoom / element.clientWidth, scope.object.matrix );
				panUp( deltaY * ( scope.object.top - scope.object.bottom ) / scope.object.zoom / element.clientHeight, scope.object.matrix );

			} else {

				// camera neither orthographic nor perspective
				console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - pan disabled.' );
				scope.enablePan = false;

			}

		};

	}();

	function dollyIn( dollyScale ) {

		if ( scope.object.isPerspectiveCamera ) {

			scale /= dollyScale;

		} else if ( scope.object.isOrthographicCamera ) {

			scope.object.zoom = Math.max( scope.minZoom, Math.min( scope.maxZoom, scope.object.zoom * dollyScale ) );
			scope.object.updateProjectionMatrix();
			zoomChanged = true;

		} else {

			console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.' );
			scope.enableZoom = false;

		}

	}

	function dollyOut( dollyScale ) {

		if ( scope.object.isPerspectiveCamera ) {

			scale *= dollyScale;

		} else if ( scope.object.isOrthographicCamera ) {

			scope.object.zoom = Math.max( scope.minZoom, Math.min( scope.maxZoom, scope.object.zoom / dollyScale ) );
			scope.object.updateProjectionMatrix();
			zoomChanged = true;

		} else {

			console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.' );
			scope.enableZoom = false;

		}

	}

	//
	// event callbacks - update the object state
	//

	function handleMouseDownRotate( event ) {

		rotateStart.set( event.clientX, event.clientY );

	}

	function handleMouseDownDolly( event ) {

		dollyStart.set( event.clientX, event.clientY );

	}

	function handleMouseDownPan( event ) {

		panStart.set( event.clientX, event.clientY );

	}

	function handleMouseMoveRotate( event ) {

		rotateEnd.set( event.clientX, event.clientY );

		rotateDelta.subVectors( rotateEnd, rotateStart ).multiplyScalar( scope.rotateSpeed );

		var element = scope.domElement;

		rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientHeight ); // yes, height

		rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight );

		rotateStart.copy( rotateEnd );

		scope.update();

	}

	function handleMouseMoveDolly( event ) {

		dollyEnd.set( event.clientX, event.clientY );

		dollyDelta.subVectors( dollyEnd, dollyStart );

		if ( dollyDelta.y > 0 ) {

			dollyIn( getZoomScale() );

		} else if ( dollyDelta.y < 0 ) {

			dollyOut( getZoomScale() );

		}

		dollyStart.copy( dollyEnd );

		scope.update();

	}

	function handleMouseMovePan( event ) {

		panEnd.set( event.clientX, event.clientY );

		panDelta.subVectors( panEnd, panStart ).multiplyScalar( scope.panSpeed );

		pan( panDelta.x, panDelta.y );

		panStart.copy( panEnd );

		scope.update();

	}

	function handleMouseUp( /*event*/ ) {

		// no-op

	}

	function handleMouseWheel( event ) {

		if ( event.deltaY < 0 ) {

			dollyOut( getZoomScale() );

		} else if ( event.deltaY > 0 ) {

			dollyIn( getZoomScale() );

		}

		scope.update();

	}

	function handleKeyDown( event ) {

		var needsUpdate = false;

		switch ( event.keyCode ) {

			case scope.keys.UP:
				pan( 0, scope.keyPanSpeed );
				needsUpdate = true;
				break;

			case scope.keys.BOTTOM:
				pan( 0, - scope.keyPanSpeed );
				needsUpdate = true;
				break;

			case scope.keys.LEFT:
				pan( scope.keyPanSpeed, 0 );
				needsUpdate = true;
				break;

			case scope.keys.RIGHT:
				pan( - scope.keyPanSpeed, 0 );
				needsUpdate = true;
				break;

		}

		if ( needsUpdate ) {

			// prevent the browser from scrolling on cursor keys
			event.preventDefault();

			scope.update();

		}


	}

	function handleTouchStartRotate( event ) {

		if ( event.touches.length == 1 ) {

			rotateStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

		} else {

			var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
			var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );

			rotateStart.set( x, y );

		}

	}

	function handleTouchStartPan( event ) {

		if ( event.touches.length == 1 ) {

			panStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

		} else {

			var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
			var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );

			panStart.set( x, y );

		}

	}

	function handleTouchStartDolly( event ) {

		var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
		var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;

		var distance = Math.sqrt( dx * dx + dy * dy );

		dollyStart.set( 0, distance );

	}

	function handleTouchStartDollyPan( event ) {

		if ( scope.enableZoom ) handleTouchStartDolly( event );

		if ( scope.enablePan ) handleTouchStartPan( event );

	}

	function handleTouchStartDollyRotate( event ) {

		if ( scope.enableZoom ) handleTouchStartDolly( event );

		if ( scope.enableRotate ) handleTouchStartRotate( event );

	}

	function handleTouchMoveRotate( event ) {

		if ( event.touches.length == 1 ) {

			rotateEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

		} else {

			var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
			var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );

			rotateEnd.set( x, y );

		}

		rotateDelta.subVectors( rotateEnd, rotateStart ).multiplyScalar( scope.rotateSpeed );

		var element = scope.domElement;

		rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientHeight ); // yes, height

		rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight );

		rotateStart.copy( rotateEnd );

	}

	function handleTouchMovePan( event ) {

		if ( event.touches.length == 1 ) {

			panEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

		} else {

			var x = 0.5 * ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX );
			var y = 0.5 * ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY );

			panEnd.set( x, y );

		}

		panDelta.subVectors( panEnd, panStart ).multiplyScalar( scope.panSpeed );

		pan( panDelta.x, panDelta.y );

		panStart.copy( panEnd );

	}

	function handleTouchMoveDolly( event ) {

		var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
		var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;

		var distance = Math.sqrt( dx * dx + dy * dy );

		dollyEnd.set( 0, distance );

		dollyDelta.set( 0, Math.pow( dollyEnd.y / dollyStart.y, scope.zoomSpeed ) );

		dollyIn( dollyDelta.y );

		dollyStart.copy( dollyEnd );

	}

	function handleTouchMoveDollyPan( event ) {

		if ( scope.enableZoom ) handleTouchMoveDolly( event );

		if ( scope.enablePan ) handleTouchMovePan( event );

	}

	function handleTouchMoveDollyRotate( event ) {

		if ( scope.enableZoom ) handleTouchMoveDolly( event );

		if ( scope.enableRotate ) handleTouchMoveRotate( event );

	}

	function handleTouchEnd( /*event*/ ) {

		// no-op

	}

	//
	// event handlers - FSM: listen for events and reset state
	//

	function onMouseDown( event ) {

		if ( scope.enabled === false ) return;

		// Prevent the browser from scrolling.

		event.preventDefault();

		// Manually set the focus since calling preventDefault above
		// prevents the browser from setting it automatically.

		scope.domElement.focus ? scope.domElement.focus() : window.focus();

		switch ( event.button ) {

			case 0:

				switch ( scope.mouseButtons.LEFT ) {

					case MOUSE.ROTATE:

						if ( event.ctrlKey || event.metaKey || event.shiftKey ) {

							if ( scope.enablePan === false ) return;

							handleMouseDownPan( event );

							state = STATE.PAN;

						} else {

							if ( scope.enableRotate === false ) return;

							handleMouseDownRotate( event );

							state = STATE.ROTATE;

						}

						break;

					case MOUSE.PAN:

						if ( event.ctrlKey || event.metaKey || event.shiftKey ) {

							if ( scope.enableRotate === false ) return;

							handleMouseDownRotate( event );

							state = STATE.ROTATE;

						} else {

							if ( scope.enablePan === false ) return;

							handleMouseDownPan( event );

							state = STATE.PAN;

						}

						break;

					default:

						state = STATE.NONE;

				}

				break;


			case 1:

				switch ( scope.mouseButtons.MIDDLE ) {

					case MOUSE.DOLLY:

						if ( scope.enableZoom === false ) return;

						handleMouseDownDolly( event );

						state = STATE.DOLLY;

						break;


					default:

						state = STATE.NONE;

				}

				break;

			case 2:

				switch ( scope.mouseButtons.RIGHT ) {

					case MOUSE.ROTATE:

						if ( scope.enableRotate === false ) return;

						handleMouseDownRotate( event );

						state = STATE.ROTATE;

						break;

					case MOUSE.PAN:

						if ( scope.enablePan === false ) return;

						handleMouseDownPan( event );

						state = STATE.PAN;

						break;

					default:

						state = STATE.NONE;

				}

				break;

		}

		if ( state !== STATE.NONE ) {

			document.addEventListener( 'mousemove', onMouseMove, false );
			document.addEventListener( 'mouseup', onMouseUp, false );

			scope.dispatchEvent( startEvent );

		}

	}

	function onMouseMove( event ) {

		if ( scope.enabled === false ) return;

		event.preventDefault();

		switch ( state ) {

			case STATE.ROTATE:

				if ( scope.enableRotate === false ) return;

				handleMouseMoveRotate( event );

				break;

			case STATE.DOLLY:

				if ( scope.enableZoom === false ) return;

				handleMouseMoveDolly( event );

				break;

			case STATE.PAN:

				if ( scope.enablePan === false ) return;

				handleMouseMovePan( event );

				break;

		}

	}

	function onMouseUp( event ) {

		if ( scope.enabled === false ) return;

		handleMouseUp( event );

		document.removeEventListener( 'mousemove', onMouseMove, false );
		document.removeEventListener( 'mouseup', onMouseUp, false );

		scope.dispatchEvent( endEvent );

		state = STATE.NONE;

	}

	function onMouseWheel( event ) {

		if ( scope.enabled === false || scope.enableZoom === false || ( state !== STATE.NONE && state !== STATE.ROTATE ) ) return;

		event.preventDefault();
		event.stopPropagation();

		scope.dispatchEvent( startEvent );

		handleMouseWheel( event );

		scope.dispatchEvent( endEvent );

	}

	function onKeyDown( event ) {

		if ( scope.enabled === false || scope.enableKeys === false || scope.enablePan === false ) return;

		handleKeyDown( event );

	}

	function onTouchStart( event ) {

		if ( scope.enabled === false ) return;

		event.preventDefault();

		switch ( event.touches.length ) {

			case 1:

				switch ( scope.touches.ONE ) {

					case TOUCH.ROTATE:

						if ( scope.enableRotate === false ) return;

						handleTouchStartRotate( event );

						state = STATE.TOUCH_ROTATE;

						break;

					case TOUCH.PAN:

						if ( scope.enablePan === false ) return;

						handleTouchStartPan( event );

						state = STATE.TOUCH_PAN;

						break;

					default:

						state = STATE.NONE;

				}

				break;

			case 2:

				switch ( scope.touches.TWO ) {

					case TOUCH.DOLLY_PAN:

						if ( scope.enableZoom === false && scope.enablePan === false ) return;

						handleTouchStartDollyPan( event );

						state = STATE.TOUCH_DOLLY_PAN;

						break;

					case TOUCH.DOLLY_ROTATE:

						if ( scope.enableZoom === false && scope.enableRotate === false ) return;

						handleTouchStartDollyRotate( event );

						state = STATE.TOUCH_DOLLY_ROTATE;

						break;

					default:

						state = STATE.NONE;

				}

				break;

			default:

				state = STATE.NONE;

		}

		if ( state !== STATE.NONE ) {

			scope.dispatchEvent( startEvent );

		}

	}

	function onTouchMove( event ) {

		if ( scope.enabled === false ) return;

		event.preventDefault();
		event.stopPropagation();

		switch ( state ) {

			case STATE.TOUCH_ROTATE:

				if ( scope.enableRotate === false ) return;

				handleTouchMoveRotate( event );

				scope.update();

				break;

			case STATE.TOUCH_PAN:

				if ( scope.enablePan === false ) return;

				handleTouchMovePan( event );

				scope.update();

				break;

			case STATE.TOUCH_DOLLY_PAN:

				if ( scope.enableZoom === false && scope.enablePan === false ) return;

				handleTouchMoveDollyPan( event );

				scope.update();

				break;

			case STATE.TOUCH_DOLLY_ROTATE:

				if ( scope.enableZoom === false && scope.enableRotate === false ) return;

				handleTouchMoveDollyRotate( event );

				scope.update();

				break;

			default:

				state = STATE.NONE;

		}

	}

	function onTouchEnd( event ) {

		if ( scope.enabled === false ) return;

		handleTouchEnd( event );

		scope.dispatchEvent( endEvent );

		state = STATE.NONE;

	}

	function onContextMenu( event ) {

		if ( scope.enabled === false ) return;

		event.preventDefault();

	}

	//

	scope.domElement.addEventListener( 'contextmenu', onContextMenu, false );

	scope.domElement.addEventListener( 'mousedown', onMouseDown, false );
	scope.domElement.addEventListener( 'wheel', onMouseWheel, false );

	scope.domElement.addEventListener( 'touchstart', onTouchStart, false );
	scope.domElement.addEventListener( 'touchend', onTouchEnd, false );
	scope.domElement.addEventListener( 'touchmove', onTouchMove, false );

	scope.domElement.addEventListener( 'keydown', onKeyDown, false );

	// make sure element can receive keys.

	if ( scope.domElement.tabIndex === - 1 ) {

		scope.domElement.tabIndex = 0;

	}

	// force an update at start

	this.update();

}