function OrbitControls ( object, domElement ) {

	    this.object = object;
	    this.domElement = ( domElement !== undefined ) ? domElement : document;
	    this.frameId = null;

	    // API

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

	    /*
	     * "target" sets the location of focus, where the control orbits around
	     * and where it pans with respect to.
	     */
	    this.target = new THREE.Vector3();

	    // center is old, deprecated; use "target" instead
	    this.center = this.target;

	    /*
	     * This option actually enables dollying in and out; left as "zoom" for
	     * backwards compatibility
	     */
	    this.noZoom = false;
	    this.zoomSpeed = 1.0;

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

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

	    // Set to true to disable this control
	    this.noRotate = false;
	    this.rotateSpeed = -0.15;

	    // Set to true to disable this control
	    this.noPan = true;
	    this.keyPanSpeed = 7.0;	// pixels moved per arrow key push

	    // Set to true to automatically rotate around the target
	    this.autoRotate = false;
	    this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60

	    /*
	     * 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

	    // Momentum
	  	this.momentumDampingFactor = 0.90;
	  	this.momentumScalingFactor = -0.005;
	  	this.momentumKeydownFactor = 20;

	  	// Fov
	  	this.minFov = 30;
	  	this.maxFov = 120;

	    /*
	     * 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 disable use of the keys
	    this.noKeys = false;

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

	    // Mouse buttons
	    this.mouseButtons = { ORBIT: THREE.MOUSE.LEFT, ZOOM: THREE.MOUSE.MIDDLE, PAN: THREE.MOUSE.RIGHT };

	    /*
	     * //////////
	     * internals
	     */

	    var scope = this;

	    var EPS = 10e-8;
	    var MEPS = 10e-5;

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

	    var panStart = new THREE.Vector2();
	    var panEnd = new THREE.Vector2();
	    var panDelta = new THREE.Vector2();
	    var panOffset = new THREE.Vector3();

	    var offset = new THREE.Vector3();

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

	    var theta = 0;
	    var phi = 0;
	    var phiDelta = 0;
	    var thetaDelta = 0;
	    var scale = 1;
	    var pan = new THREE.Vector3();

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

	    var momentumLeft = 0, momentumUp = 0;
	    var eventPrevious;
	    var momentumOn = false;

	    var keyUp, keyBottom, keyLeft, keyRight;

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

	    var state = STATE.NONE;

	    // for reset

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

	    // so camera.up is the orbit axis

	    var quat = new THREE.Quaternion().setFromUnitVectors( object.up, new THREE.Vector3( 0, 1, 0 ) );
	    var quatInverse = quat.clone().inverse();

	    // events

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

	    this.setLastQuaternion = function ( quaternion ) {
	        lastQuaternion.copy( quaternion );
	        scope.object.quaternion.copy( quaternion );
	    };

	    this.getLastPosition = function () {
	        return lastPosition;
	    };

	    this.rotateLeft = function ( angle ) {

	        if ( angle === undefined ) {

	            angle = getAutoRotationAngle();

	        }

	        thetaDelta -= angle;


	    };

	    this.rotateUp = function ( angle ) {

	        if ( angle === undefined ) {

	            angle = getAutoRotationAngle();

	        }

	        phiDelta -= angle;

	    };

	    // pass in distance in world space to move left
	    this.panLeft = function ( distance ) {

	        var te = this.object.matrix.elements;

	        // get X column of matrix
	        panOffset.set( te[ 0 ], te[ 1 ], te[ 2 ] );
	        panOffset.multiplyScalar( - distance );

	        pan.add( panOffset );

	    };

	    // pass in distance in world space to move up
	    this.panUp = function ( distance ) {

	        var te = this.object.matrix.elements;

	        // get Y column of matrix
	        panOffset.set( te[ 4 ], te[ 5 ], te[ 6 ] );
	        panOffset.multiplyScalar( distance );

	        pan.add( panOffset );

	    };

	    /*
	     * pass in x,y of change desired in pixel space,
	     * right and down are positive
	     */
	    this.pan = function ( deltaX, deltaY ) {

	        var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

	        if ( scope.object instanceof THREE.PerspectiveCamera ) {

	            // perspective
	            var position = scope.object.position;
	            var offset = position.clone().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 actually don't use screenWidth, since perspective camera is fixed to screen height
	            scope.panLeft( 2 * deltaX * targetDistance / element.clientHeight );
	            scope.panUp( 2 * deltaY * targetDistance / element.clientHeight );

	        } else if ( scope.object instanceof THREE.OrthographicCamera ) {

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

	        } else {

	            // camera neither orthographic or perspective
	            console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - pan disabled.' );

	        }

	    };

	    this.momentum = function(){
			
	        if ( !momentumOn ) return;

	        if ( Math.abs( momentumLeft ) < MEPS && Math.abs( momentumUp ) < MEPS ) { 

	            momentumOn = false; 
	            return;
	        }

	        momentumUp   *= this.momentumDampingFactor;
	        momentumLeft *= this.momentumDampingFactor;

	        thetaDelta -= this.momentumScalingFactor * momentumLeft;
	        phiDelta   -= this.momentumScalingFactor * momentumUp;

	    };

	    this.dollyIn = function ( dollyScale ) {

	        if ( dollyScale === undefined ) {

	            dollyScale = getZoomScale();

	        }

	        if ( scope.object instanceof THREE.PerspectiveCamera ) {

	            scale /= dollyScale;

	        } else if ( scope.object instanceof THREE.OrthographicCamera ) {

	            scope.object.zoom = Math.max( this.minZoom, Math.min( this.maxZoom, this.object.zoom * dollyScale ) );
	            scope.object.updateProjectionMatrix();
	            scope.dispatchEvent( changeEvent );

	        } else {

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

	        }

	    };

	    this.dollyOut = function ( dollyScale ) {

	        if ( dollyScale === undefined ) {

	            dollyScale = getZoomScale();

	        }

	        if ( scope.object instanceof THREE.PerspectiveCamera ) {

	            scale *= dollyScale;

	        } else if ( scope.object instanceof THREE.OrthographicCamera ) {

	            scope.object.zoom = Math.max( this.minZoom, Math.min( this.maxZoom, this.object.zoom / dollyScale ) );
	            scope.object.updateProjectionMatrix();
	            scope.dispatchEvent( changeEvent );

	        } else {

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

	        }

	    };

	    this.update = function ( ignoreUpdate ) {

	        var position = this.object.position;

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

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

	        // angle from z-axis around y-axis

	        theta = Math.atan2( offset.x, offset.z );

	        // angle from y-axis

	        phi = Math.atan2( Math.sqrt( offset.x * offset.x + offset.z * offset.z ), offset.y );

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

	            this.rotateLeft( getAutoRotationAngle() );

	        }

	        this.momentum();

	        theta += thetaDelta;
	        phi += phiDelta;

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

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

	        // restrict phi to be betwee EPS and PI-EPS
	        phi = Math.max( EPS, Math.min( Math.PI - EPS, phi ) );

	        var radius = offset.length() * scale;

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

	        // move target to panned location
	        this.target.add( pan );

	        offset.x = radius * Math.sin( phi ) * Math.sin( theta );
	        offset.y = radius * Math.cos( phi );
	        offset.z = radius * Math.sin( phi ) * Math.cos( theta );

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

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

	        this.object.lookAt( this.target );

	        thetaDelta = 0;
	        phiDelta = 0;
	        scale = 1;
	        pan.set( 0, 0, 0 );

	        /*
	         * update condition is:
	         * min(camera displacement, camera rotation in radians)^2 > EPS
	         * using small-angle approximation cos(x/2) = 1 - x^2 / 8
	         */
	        if ( lastPosition.distanceToSquared( this.object.position ) > EPS
			    || 8 * (1 - lastQuaternion.dot(this.object.quaternion)) > EPS ) {

	            if ( ignoreUpdate !== true ) { this.dispatchEvent( changeEvent ); }

	            lastPosition.copy( this.object.position );
	            lastQuaternion.copy (this.object.quaternion );

	        }

	    };


	    this.reset = function () {

	        state = STATE.NONE;

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

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

	        this.update();

	    };

	    this.getPolarAngle = function () {

	        return phi;

	    };

	    this.getAzimuthalAngle = function () {

	        return theta;

	    };

	    function getAutoRotationAngle() {

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

	    }

	    function getZoomScale() {

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

	    }

	    function onMouseDown( event ) {

	        momentumOn = false;

	   		momentumLeft = momentumUp = 0;

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

	        if ( event.button === scope.mouseButtons.ORBIT ) {
	            if ( scope.noRotate === true ) return;

	            state = STATE.ROTATE;

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

	        } else if ( event.button === scope.mouseButtons.ZOOM ) {
	            if ( scope.noZoom === true ) return;

	            state = STATE.DOLLY;

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

	        } else if ( event.button === scope.mouseButtons.PAN ) {
	            if ( scope.noPan === true ) return;

	            state = STATE.PAN;

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

	        }

	        if ( state !== STATE.NONE ) {
	            document.addEventListener( 'mousemove', onMouseMove, false );
	            document.addEventListener( 'mouseup', onMouseUp, false );
	            scope.dispatchEvent( startEvent );
	        }

	        scope.update();

	    }

	    function onMouseMove( event ) {

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

	        event.preventDefault();

	        var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

	        if ( state === STATE.ROTATE ) {

	            if ( scope.noRotate === true ) return;

	            rotateEnd.set( event.clientX, event.clientY );
	            rotateDelta.subVectors( rotateEnd, rotateStart );

	            // rotating across whole screen goes 360 degrees around
	            scope.rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientWidth * scope.rotateSpeed );

	            // rotating up and down along whole screen attempts to go 360, but limited to 180
	            scope.rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight * scope.rotateSpeed );

	            rotateStart.copy( rotateEnd );

	            if( eventPrevious ){
	                momentumLeft = event.clientX - eventPrevious.clientX;
	                momentumUp = event.clientY - eventPrevious.clientY;
	            }

	            eventPrevious = event;

	        } else if ( state === STATE.DOLLY ) {

	            if ( scope.noZoom === true ) return;

	            dollyEnd.set( event.clientX, event.clientY );
	            dollyDelta.subVectors( dollyEnd, dollyStart );

	            if ( dollyDelta.y > 0 ) {

	                scope.dollyIn();

	            } else if ( dollyDelta.y < 0 ) {

	                scope.dollyOut();

	            }

	            dollyStart.copy( dollyEnd );

	        } else if ( state === STATE.PAN ) {

	            if ( scope.noPan === true ) return;

	            panEnd.set( event.clientX, event.clientY );
	            panDelta.subVectors( panEnd, panStart );

	            scope.pan( panDelta.x, panDelta.y );

	            panStart.copy( panEnd );

	        }

	        if ( state !== STATE.NONE ) scope.update();

	    }

	    function onMouseUp( /* event */ ) {

	        momentumOn = true;

	        eventPrevious = undefined;

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

	        document.removeEventListener( 'mousemove', onMouseMove, false );
	        document.removeEventListener( 'mouseup', onMouseUp, false );
	        scope.dispatchEvent( endEvent );
	        state = STATE.NONE;

	    }

	    function onMouseWheel( event ) {

	        if ( scope.enabled === false || scope.noZoom === true || state !== STATE.NONE ) return;

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

	        var delta = 0;

	        if ( event.wheelDelta !== undefined ) { // WebKit / Opera / Explorer 9

	            delta = event.wheelDelta;

	        } else if ( event.detail !== undefined ) { // Firefox

	            delta = - event.detail;

	        }

	        if ( delta > 0 ) {

	            // scope.dollyOut();
	            scope.object.fov = ( scope.object.fov < scope.maxFov ) 
	                ? scope.object.fov + 1
	                : scope.maxFov;
	            scope.object.updateProjectionMatrix();

	        } else if ( delta < 0 ) {

	            // scope.dollyIn();
	            scope.object.fov = ( scope.object.fov > scope.minFov ) 
	                ? scope.object.fov - 1
	                : scope.minFov;
	            scope.object.updateProjectionMatrix();

	        }

	        scope.update();
	        scope.dispatchEvent( changeEvent );
	        scope.dispatchEvent( startEvent );
	        scope.dispatchEvent( endEvent );

	    }

	    function onKeyUp ( event ) {

	        switch ( event.keyCode ) {

	        case scope.keys.UP:
	            keyUp = false;
	            break;

	        case scope.keys.BOTTOM:
	            keyBottom = false;
	            break;

	        case scope.keys.LEFT:
	            keyLeft = false;
	            break;

	        case scope.keys.RIGHT:
	            keyRight = false;
	            break;

	        }

	    }

	    function onKeyDown( event ) {

	        if ( scope.enabled === false || scope.noKeys === true || scope.noRotate === true ) return;

	        switch ( event.keyCode ) {

	        case scope.keys.UP:
	            keyUp = true;
	            break;

	        case scope.keys.BOTTOM:
	            keyBottom = true;
	            break;

	        case scope.keys.LEFT:
	            keyLeft = true;
	            break;

	        case scope.keys.RIGHT:
	            keyRight = true;
	            break;

	        }

	        if (keyUp || keyBottom || keyLeft || keyRight) {

	            momentumOn = true;

	            if (keyUp) momentumUp = - scope.rotateSpeed * scope.momentumKeydownFactor;
	            if (keyBottom) momentumUp = scope.rotateSpeed * scope.momentumKeydownFactor;
	            if (keyLeft) momentumLeft = - scope.rotateSpeed * scope.momentumKeydownFactor;
	            if (keyRight) momentumLeft = scope.rotateSpeed * scope.momentumKeydownFactor;

	        }

	    }

	    function touchstart( event ) {

	        momentumOn = false;

	        momentumLeft = momentumUp = 0;

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

	        switch ( event.touches.length ) {

	        case 1:	// one-fingered touch: rotate

	            if ( scope.noRotate === true ) return;

	            state = STATE.TOUCH_ROTATE;

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

	        case 2:	// two-fingered touch: dolly

	            if ( scope.noZoom === true ) return;

	            state = STATE.TOUCH_DOLLY;

	            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 );

	            break;

	        case 3: // three-fingered touch: pan

	            if ( scope.noPan === true ) return;

	            state = STATE.TOUCH_PAN;

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

	        default:

	            state = STATE.NONE;

	        }

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

	    }

	    function touchmove( event ) {

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

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

	        var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

	        switch ( event.touches.length ) {

	        case 1: // one-fingered touch: rotate

	            if ( scope.noRotate === true ) return;
	            if ( state !== STATE.TOUCH_ROTATE ) return;

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

	            // rotating across whole screen goes 360 degrees around
	            scope.rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientWidth * scope.rotateSpeed );
	            // rotating up and down along whole screen attempts to go 360, but limited to 180
	            scope.rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight * scope.rotateSpeed );

	            rotateStart.copy( rotateEnd );

	            if( eventPrevious ){
	                momentumLeft = event.touches[ 0 ].pageX - eventPrevious.pageX;
	                momentumUp = event.touches[ 0 ].pageY - eventPrevious.pageY;
	            }

	            eventPrevious = {
	                pageX: event.touches[ 0 ].pageX,
	                pageY: event.touches[ 0 ].pageY,
	            };

	            scope.update();
	            break;

	        case 2: // two-fingered touch: dolly

	            if ( scope.noZoom === true ) return;
	            if ( state !== STATE.TOUCH_DOLLY ) return;

	            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.subVectors( dollyEnd, dollyStart );

	            if ( dollyDelta.y < 0 ) {

	                scope.object.fov = ( scope.object.fov < scope.maxFov ) 
	                    ? scope.object.fov + 1
	                    : scope.maxFov;
	                scope.object.updateProjectionMatrix();

	            } else if ( dollyDelta.y > 0 ) {

	                scope.object.fov = ( scope.object.fov > scope.minFov ) 
	                    ? scope.object.fov - 1
	                    : scope.minFov;
	                scope.object.updateProjectionMatrix();

	            }

	            dollyStart.copy( dollyEnd );

	            scope.update();
	            scope.dispatchEvent( changeEvent );
	            break;

	        case 3: // three-fingered touch: pan

	            if ( scope.noPan === true ) return;
	            if ( state !== STATE.TOUCH_PAN ) return;

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

	            scope.pan( panDelta.x, panDelta.y );

	            panStart.copy( panEnd );

	            scope.update();
	            break;

	        default:

	            state = STATE.NONE;

	        }

	    }

	    function touchend( /* event */ ) {

	        momentumOn = true;

	        eventPrevious = undefined;

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

	        scope.dispatchEvent( endEvent );
	        state = STATE.NONE;

	    }

	    this.dispose = function() {

	        this.domElement.removeEventListener( 'mousedown', onMouseDown );
	        this.domElement.removeEventListener( 'mousewheel', onMouseWheel );
	        this.domElement.removeEventListener( 'DOMMouseScroll', onMouseWheel );

	        this.domElement.removeEventListener( 'touchstart', touchstart );
	        this.domElement.removeEventListener( 'touchend', touchend );
	        this.domElement.removeEventListener( 'touchmove', touchmove );

	        window.removeEventListener( 'keyup', onKeyUp );
	        window.removeEventListener( 'keydown', onKeyDown );

	    };

	    // this.domElement.addEventListener( 'contextmenu', function ( event ) { event.preventDefault(); }, false );
	    this.domElement.addEventListener( 'mousedown', onMouseDown, { passive: false } );
	    this.domElement.addEventListener( 'mousewheel', onMouseWheel, { passive: false } );
	    this.domElement.addEventListener( 'DOMMouseScroll', onMouseWheel, { passive: false } ); // firefox

	    this.domElement.addEventListener( 'touchstart', touchstart, { passive: false } );
	    this.domElement.addEventListener( 'touchend', touchend, { passive: false } );
	    this.domElement.addEventListener( 'touchmove', touchmove, { passive: false } );

	    window.addEventListener( 'keyup', onKeyUp, { passive: false } );
	    window.addEventListener( 'keydown', onKeyDown, { passive: false } );

	    // force an update at start
	    this.update();

	}
@classdesc Orbit Controls
@constructor
@external OrbitControls
@param {THREE.Object} object 
@param {HTMLElement} domElement