diff --git a/examples/js/controls/ArcballControls.js b/examples/js/controls/ArcballControls.js
index fe0094be364b172c78f6be711dac00ffc89c0279..f03d1b7d57cbd171e440d8a28166c06bd4108ee3 100644
--- a/examples/js/controls/ArcballControls.js
+++ b/examples/js/controls/ArcballControls.js
@@ -1,8 +1,6 @@
 ( function () {
-	
-	//trackball state
+
 	const STATE = {
-	
 		IDLE: Symbol(),
 		ROTATE: Symbol(),
 		PAN: Symbol(),
@@ -13,3159 +11,2985 @@
 		TOUCH_MULTI: Symbol(),
 		ANIMATION_FOCUS: Symbol(),
 		ANIMATION_ROTATE: Symbol()
-	
 	};
-	
 	const INPUT = {
-	
 		NONE: Symbol(),
 		ONE_FINGER: Symbol(),
 		ONE_FINGER_SWITCHED: Symbol(),
 		TWO_FINGER: Symbol(),
 		MULT_FINGER: Symbol(),
 		CURSOR: Symbol()
-	
-	};
-	
-	//cursor center coordinates
+	}; //cursor center coordinates
+
 	const _center = {
-	
 		x: 0,
 		y: 0
-	
-	};
-	
-	//transformation matrices for gizmos and camera
+	}; //transformation matrices for gizmos and camera
+
 	const _transformation = {
-	
 		camera: new THREE.Matrix4(),
 		gizmos: new THREE.Matrix4()
-	
+	}; //events
+
+	const _changeEvent = {
+		type: 'change'
+	};
+	const _startEvent = {
+		type: 'start'
+	};
+	const _endEvent = {
+		type: 'end'
 	};
-	
-	//events
-	const _changeEvent = { type: 'change' };
-	const _startEvent = { type: 'start' };
-	const _endEvent = { type: 'end' };
-	
-	
 	/**
-	 * 
-	 * @param {Camera} camera Virtual camera used in the scene
-	 * @param {HTMLElement} domElement Renderer's dom element
-	 * @param {Scene} scene The scene to be rendered
-	 */
+ *
+ * @param {Camera} camera Virtual camera used in the scene
+ * @param {HTMLElement} domElement Renderer's dom element
+ * @param {Scene} scene The scene to be rendered
+ */
+
 	class ArcballControls extends THREE.Object3D {
-	
-		constructor( camera, domElement, scene = null ) {
-	
+
+		constructor( _camera, domElement, scene = null ) {
+
 			super();
-			this.camera = null;
-			this.domElement = domElement;
-			this.scene = scene;
 
-			this.mouseActions = [];
-			this._mouseOp = null;
+			this.onWindowResize = () => {
 
-			//global vectors and matrices that are used in some operations to avoid creating new objects every time (e.g. every time cursor moves)
-			this._v2_1 = new THREE.Vector2();
-			this._v3_1 = new THREE.Vector3();
-			this._v3_2 = new THREE.Vector3();
-	
-			this._m4_1 = new THREE.Matrix4();
-			this._m4_2 = new THREE.Matrix4();
-	
-			this._quat = new THREE.Quaternion();
-	
-			//transformation matrices
-			this._translationMatrix = new THREE.Matrix4();    //matrix for translation operation
-			this._rotationMatrix = new THREE.Matrix4();   //matrix for rotation operation
-			this._scaleMatrix = new THREE.Matrix4();    //matrix for scaling operation
-	
-			this._rotationAxis = new THREE.Vector3();   //axis for rotate operation
-	
-	
-			//camera state
-			this._cameraMatrixState = new THREE.Matrix4();
-			this._cameraProjectionState = new THREE.Matrix4();
-	
-			this._fovState = 1;
-			this._upState = new THREE.Vector3();
-			this._zoomState = 1;
-			this._nearPos = 0;
-			this._farPos = 0;
-	
-			this._gizmoMatrixState = new THREE.Matrix4();
-		
-			//initial values
-			this._up0 = new THREE.Vector3();
-			this._zoom0 = 1;
-			this._fov0 = 0;
-			this._initialNear = 0;
-			this._nearPos0 = 0;
-			this._initialFar = 0;
-			this._farPos0 = 0;
-			this._cameraMatrixState0 = new THREE.Matrix4();
-			this._gizmoMatrixState0 = new THREE.Matrix4();
-	
-			//pointers array
-			this._button = -1;
-			this._touchStart = [];
-			this._touchCurrent = [];
-			this._input = INPUT.NONE;
-	
-			//two fingers touch interaction
-			this._switchSensibility = 32;	//minimum movement to be performed to fire single pan start after the second finger has been released
-			this._startFingerDistance = 0; //distance between two fingers
-			this._currentFingerDistance = 0;
-			this._startFingerRotation = 0; //amount of rotation performed with two fingers
-			this._currentFingerRotation = 0;
-	
-			//double tap
-			this._devPxRatio = 0;
-			this._downValid = true;
-			this._nclicks = 0;
-			this._downEvents = [];
-			this._downStart = 0;	//pointerDown time
-			this._clickStart = 0;	//first click time
-			this._maxDownTime = 250;
-			this._maxInterval = 300;
-			this._posThreshold = 24;
-			this._movementThreshold = 24;
-	
-			//cursor positions
-			this._currentCursorPosition = new THREE.Vector3();
-			this._startCursorPosition = new THREE.Vector3();
-	
-			//grid
-			this._grid = null; //grid to be visualized during pan operation
-			this._gridPosition = new THREE.Vector3();
-	
-			//gizmos
-			this._gizmos = new THREE.Group();
-			this._curvePts = 128;
-	
-	
-			//animations
-			this._timeStart = -1; //initial time
-			this._animationId = -1;
-	
-			//focus animation
-			this.focusAnimationTime = 500; //duration of focus animation in ms
-	
-			//rotate animation
-			this._timePrev = 0; //time at which previous rotate operation has been detected
-			this._timeCurrent = 0;  //time at which current rotate operation has been detected
-			this._anglePrev = 0; //angle of previous rotation
-			this._angleCurrent = 0;  //angle of current rotation
-			this._cursorPosPrev = new THREE.Vector3();	//cursor position when previous rotate operation has been detected
-			this._cursorPosCurr = new THREE.Vector3();//cursor position when current rotate operation has been detected
-			this._wPrev = 0; //angular velocity of the previous rotate operation
-			this._wCurr = 0; //angular velocity of the current rotate operation
-	
-	
-			//parameters
-			this.adjustNearFar = false;
-			this.scaleFactor = 1.1;	//zoom/distance multiplier
-			this.dampingFactor = 25;
-			this.wMax = 20;	//maximum angular velocity allowed
-			this.enableAnimations = true;    //if animations should be performed
-			this.enableGrid = false;   //if grid should be showed during pan operation
-			this.cursorZoom = false;	//if wheel zoom should be cursor centered
-			this.minFov = 5;
-			this.maxFov = 90;
-	
-			this.enabled = true;
-			this.enablePan = true;
-			this.enableRotate = true;
-			this.enableZoom = true;
-			this.enableGizmos = true;
-	
-			this.minDistance = 0;
-			this.maxDistance = Infinity;
-			this.minZoom = 0;
-			this.maxZoom = Infinity;
-	
-			//trackball parameters
-			this._tbCenter = new THREE.Vector3( 0, 0, 0 );
-			this._tbRadius = 1;
-	
-			//FSA
-			this._state = STATE.IDLE;
-	
-			this.setCamera(camera);
-	
-			if ( this.scene != null ) {
-	
-				this.scene.add( this._gizmos );
-			
-			}
-	
-			this.domElement.style.touchAction = 'none';
-			this._devPxRatio = window.devicePixelRatio;
-	
-			this.initializeMouseActions();
-	
-			this.domElement.addEventListener( 'contextmenu', this.onContextMenu );
-			this.domElement.addEventListener( 'wheel', this.onWheel );
-			this.domElement.addEventListener( 'pointerdown', this.onPointerDown );
-			this.domElement.addEventListener( 'pointercancel', this.onPointerCancel )
-	
-			window.addEventListener( 'keydown', this.onKeyDown );
-			window.addEventListener( 'resize', this.onWindowResize );
-	
-		};
-	
-		//listeners
-	
-		onWindowResize = () => {
-	
-			const scale = ( this._gizmos.scale.x + this._gizmos.scale.y + this._gizmos.scale.z ) / 3; 
-			this._tbRadius = this.calculateTbRadius( this.camera );
-	
-			const newRadius = this._tbRadius / scale;
-			const curve = new THREE.EllipseCurve( 0, 0, newRadius, newRadius );
-			const points = curve.getPoints( this._curvePts );
-			const curveGeometry = new THREE.BufferGeometry().setFromPoints( points );
-	
-	
-			for( let gizmo in this._gizmos.children ) {
-	
-				this._gizmos.children[ gizmo ].geometry = curveGeometry;
-	
-			}
-	
-			this.dispatchEvent( _changeEvent );
-	
-		};
+				const scale = ( this._gizmos.scale.x + this._gizmos.scale.y + this._gizmos.scale.z ) / 3;
+				this._tbRadius = this.calculateTbRadius( this.camera );
+				const newRadius = this._tbRadius / scale;
+				const curve = new THREE.EllipseCurve( 0, 0, newRadius, newRadius );
+				const points = curve.getPoints( this._curvePts );
+				const curveGeometry = new THREE.BufferGeometry().setFromPoints( points );
 
-		onContextMenu = ( event ) => {
+				for ( const gizmo in this._gizmos.children ) {
+
+					this._gizmos.children[ gizmo ].geometry = curveGeometry;
 
-			if ( !this.enabled ) {
-	
-				return;
-	
-			}
-	
-			for( let i = 0; i < this.mouseActions.length; i++ ) {
-	
-				if ( this.mouseActions[ i ].mouse == 2 ) {
-	
-					//prevent only if button 2 is actually used
-					event.preventDefault();
-					break;
-	
 				}
-	
-			}
-	
-		};
-	
-		onPointerCancel = ( event ) => {
-	
-			this._touchStart.splice( 0, this._touchStart.length );
-			this._touchCurrent.splice( 0, this._touchCurrent.length );
-			this._input = INPUT.NONE;
-	
-		};
-	
-		onPointerDown = ( event ) => {
-
-			if ( event.button == 0 && event.isPrimary ) {
-	
-				this._downValid = true;
-				this._downEvents.push( event );
-				this._downStart = performance.now();
-	
-			} else {
-	
-				this._downValid = false;
-	
-			}
-	
-			if ( event.pointerType == 'touch' && this._input != INPUT.CURSOR ) {
-	
-				this._touchStart.push( event );
-				this._touchCurrent.push( event );
-	
-				switch ( this._input ) {
-	
-					case INPUT.NONE:
-	
-						//singleStart
-						this._input = INPUT.ONE_FINGER;
-						this.onSinglePanStart( event, 'ROTATE' );
-	
-						window.addEventListener( 'pointermove', this.onPointerMove );
-						window.addEventListener( 'pointerup', this.onPointerUp );
-	
-						break;
-	
-					case INPUT.ONE_FINGER:
-					case INPUT.ONE_FINGER_SWITCHED:
-	
-						//doubleStart
-						this._input = INPUT.TWO_FINGER;
-	
-						this.onRotateStart();
-						this.onPinchStart();
-						this.onDoublePanStart();
-	
-						break;
-	
-					case INPUT.TWO_FINGER:
-						
-						//multipleStart
-						this._input = INPUT.MULT_FINGER;
-						this.onTriplePanStart( event );
-						break;
+
+				this.dispatchEvent( _changeEvent );
+
+			};
+
+			this.onContextMenu = event => {
+
+				if ( ! this.enabled ) {
+
+					return;
+
 				}
-	
-			} else if ( event.pointerType != 'touch' && this._input == INPUT.NONE ) {
-	
-				let modifier = null;
-
-				if( event.ctrlKey || event.metaKey ) {
-	
-					modifier = 'CTRL';
-	
-				} else if ( event.shiftKey ) {
-	
-					modifier = 'SHIFT';
-	
+
+				for ( let i = 0; i < this.mouseActions.length; i ++ ) {
+
+					if ( this.mouseActions[ i ].mouse == 2 ) {
+
+						//prevent only if button 2 is actually used
+						event.preventDefault();
+						break;
+
+					}
+
 				}
-	
-				this._mouseOp = this.getOpFromAction( event.button, modifier );
-				if ( this._mouseOp != null ) {
-		
-					window.addEventListener( 'pointermove', this.onPointerMove );
-					window.addEventListener( 'pointerup', this.onPointerUp );
-		
-					//singleStart
-					this._input = INPUT.CURSOR;
-					this._button = event.button;
-					this.onSinglePanStart( event, this._mouseOp );
-	
+
+			};
+
+			this.onPointerCancel = () => {
+
+				this._touchStart.splice( 0, this._touchStart.length );
+
+				this._touchCurrent.splice( 0, this._touchCurrent.length );
+
+				this._input = INPUT.NONE;
+
+			};
+
+			this.onPointerDown = event => {
+
+				if ( event.button == 0 && event.isPrimary ) {
+
+					this._downValid = true;
+
+					this._downEvents.push( event );
+
+					this._downStart = performance.now();
+
+				} else {
+
+					this._downValid = false;
+
 				}
-	
-			}
-	
-		};
-	
-		onPointerMove = ( event ) => {
-
-			if ( event.pointerType == 'touch' && this._input != INPUT.CURSOR ) {
-	
-				switch ( this._input ) {
-	
-					case INPUT.ONE_FINGER:
-						
-						//singleMove
-						this.updateTouchEvent( event );
-	
-						this.onSinglePanMove( event, STATE.ROTATE );
-						break;
-	
-					case INPUT.ONE_FINGER_SWITCHED:
-	
-						const movement = this.calculatePointersDistance( this._touchCurrent[ 0 ], event ) * this._devPxRatio;
-					
-						if ( movement >= this._switchSensibility ) {
-	
-							//singleMove
+
+				if ( event.pointerType == 'touch' && this._input != INPUT.CURSOR ) {
+
+					this._touchStart.push( event );
+
+					this._touchCurrent.push( event );
+
+					switch ( this._input ) {
+
+						case INPUT.NONE:
+							//singleStart
 							this._input = INPUT.ONE_FINGER;
-							this.updateTouchEvent( event );
-	
 							this.onSinglePanStart( event, 'ROTATE' );
+							window.addEventListener( 'pointermove', this.onPointerMove );
+							window.addEventListener( 'pointerup', this.onPointerUp );
 							break;
-	
-						}
-	
-						break;
-	
-					case INPUT.TWO_FINGER:
-	
-						//rotate/pan/pinchMove
-						this.updateTouchEvent( event );
-	
-						this.onRotateMove();
-						this.onPinchMove();
-						this.onDoublePanMove();
-	
-						break;
-	
-					case INPUT.MULT_FINGER:
-	
-						//multMove
-						this.updateTouchEvent( event );
-	
-						this.onTriplePanMove( event );
-						break;
-				
-				}
-	
-			} else if ( event.pointerType != 'touch' && this._input == INPUT.CURSOR ) {
-	
-				let modifier = null;
-
-				if( event.ctrlKey || event.metaKey ) {
-	
-					modifier = 'CTRL';
-	
-				} else if ( event.shiftKey ) {
-	
-					modifier = 'SHIFT';
-	
-				}
-	
-				const mouseOpState = this.getOpStateFromAction( this._button, modifier );
-	
-				if ( mouseOpState != null ) {
-	
-					this.onSinglePanMove( event, mouseOpState );
-	
-				}
-	
-			}
-	
-			//checkDistance
-			if( this._downValid ) {
-	
-				const movement = this.calculatePointersDistance( this._downEvents[ this._downEvents.length -1 ], event ) * this._devPxRatio;
-				if ( movement > this._movementThreshold ) {
-		
-					this._downValid = false;
-	
-				}
-	
-			}
-	
-		};
-	
-		onPointerUp = ( event ) => {
-	
-			if ( event.pointerType == 'touch' && this._input != INPUT.CURSOR ) {
-	
-				let nTouch = this._touchCurrent.length;
-	
-				for( let i = 0; i < nTouch; i++ ) {
-	
-					if ( this._touchCurrent[ i ].pointerId == event.pointerId ) {
-	
-						this._touchCurrent.splice( i, 1 );
-						this._touchStart.splice( i, 1 );
-						break;
-	
+
+						case INPUT.ONE_FINGER:
+						case INPUT.ONE_FINGER_SWITCHED:
+							//doubleStart
+							this._input = INPUT.TWO_FINGER;
+							this.onRotateStart();
+							this.onPinchStart();
+							this.onDoublePanStart();
+							break;
+
+						case INPUT.TWO_FINGER:
+							//multipleStart
+							this._input = INPUT.MULT_FINGER;
+							this.onTriplePanStart( event );
+							break;
+
 					}
-	
-				}
-	
-				switch ( this._input ) {
-	
-					case INPUT.ONE_FINGER:
-					case INPUT.ONE_FINGER_SWITCHED:
-						
-						//singleEnd
-						window.removeEventListener( 'pointermove', this.onPointerMove );
-						window.removeEventListener( 'pointerup', this.onPointerUp );
-	
-						this._input = INPUT.NONE;
-						this.onSinglePanEnd();
-	
-						break;
-	
-					case INPUT.TWO_FINGER:
-	
-						//doubleEnd
-						this.onDoublePanEnd( event );
-						this.onPinchEnd( event );
-						this.onRotateEnd( event );
-	
-						//switching to singleStart
-						this._input = INPUT.ONE_FINGER_SWITCHED;
-	
-						break;					
-						
-					case INPUT.MULT_FINGER:
-						
-						if ( this._touchCurrent.length == 0 ) {
-	
-							window.removeEventListener( 'pointermove', this.onPointerMove );
-							window.removeEventListener( 'pointerup', this.onPointerUp );
 
-							//multCancel
-							this._input = INPUT.NONE;
-							this.onTriplePanEnd();
-	
-						}
-	
-						break;
-	
-				}
-	
-			} else if ( event.pointerType != 'touch' && this._input == INPUT.CURSOR ) {
-	
-				window.removeEventListener( 'pointermove', this.onPointerMove );
-				window.removeEventListener( 'pointerup', this.onPointerUp );
-	
-				this._input = INPUT.NONE;
-				this.onSinglePanEnd();
-				this._button = -1;
-	
-			}
-	
-			if ( event.isPrimary ) {
-	
-				if ( this._downValid ) {
-	
-					const downTime = event.timeStamp - this._downEvents[ this._downEvents.length -1 ].timeStamp;
-	
-					if ( downTime <= this._maxDownTime ) {
-	
-						if ( this._nclicks == 0 ) {
-	
-							//first valid click detected
-							this._nclicks = 1;
-							this._clickStart = performance.now();
-	
-						} else {
-	
-							const clickInterval = event.timeStamp - this._clickStart;
-							const movement = this.calculatePointersDistance( this._downEvents[ 1 ], this._downEvents[ 0 ] ) * this._devPxRatio;
-	
-							if ( clickInterval <= this._maxInterval && movement <= this._posThreshold ) {
-	
-								//second valid click detected
-								//fire double tap and reset values
-								this._nclicks = 0;
-								this._downEvents.splice( 0, this._downEvents.length );
-								this.onDoubleTap( event );
-	
-							} else {
-	
-								//new 'first click'
-								this._nclicks = 1;
-								this._downEvents.shift();
-								this._clickStart = performance.now();
-	
-							}
-	
-						}
-	
-					} else {
-	
-						this._downValid = false;
-						this._nclicks = 0;
-						this._downEvents.splice( 0, this._downEvents.length );
-	
+				} else if ( event.pointerType != 'touch' && this._input == INPUT.NONE ) {
+
+					let modifier = null;
+
+					if ( event.ctrlKey || event.metaKey ) {
+
+						modifier = 'CTRL';
+
+					} else if ( event.shiftKey ) {
+
+						modifier = 'SHIFT';
+
 					}
-	
-				} else {
-	
-					this._nclicks = 0;
-					this._downEvents.splice( 0, this._downEvents.length );
-	
-				}
-			}
-	
-		};
-	
-		onWheel = ( event ) => {
-	
-			if ( this.enabled && this.enableZoom ) {
-
-				let modifier = null;
-	
-				if( event.ctrlKey || event.metaKey ) {
-	
-					modifier = 'CTRL';
-	
-				} else if ( event.shiftKey ) {
-	
-					modifier = 'SHIFT';
-	
-				}
-	
-				const mouseOp = this.getOpFromAction( 'WHEEL', modifier );
-	
-				if ( mouseOp != null ) {
-	
-					event.preventDefault();
-					this.dispatchEvent( _startEvent );
-	
-					const notchDeltaY = 125;    //distance of one notch of mouse wheel
-					let sgn = event.deltaY / notchDeltaY;
-					
-					let size = 1;
-	
-					if ( sgn > 0 ) {
-	
-						size =  1 / this.scaleFactor;
-	
-					} else if ( sgn < 0 ) {
-	
-						size = this.scaleFactor;
-	
+
+					this._mouseOp = this.getOpFromAction( event.button, modifier );
+
+					if ( this._mouseOp != null ) {
+
+						window.addEventListener( 'pointermove', this.onPointerMove );
+						window.addEventListener( 'pointerup', this.onPointerUp ); //singleStart
+
+						this._input = INPUT.CURSOR;
+						this._button = event.button;
+						this.onSinglePanStart( event, this._mouseOp );
+
 					}
-	
-					switch ( mouseOp ) {
-	
-						case 'ZOOM':
-							
-							this.updateTbState( STATE.SCALE, true );
-	
-							if ( sgn > 0 ) {
-	
-								size =  1 / ( Math.pow( this.scaleFactor, sgn ) );
-				
-							} else if ( sgn < 0 ) {
-				
-								size = Math.pow( this.scaleFactor, -sgn );
-				
-							}
-				
-							if ( this.cursorZoom && this.enablePan ) {
-				
-								let scalePoint;
-			
-								if ( this.camera.isOrthographicCamera ) {
-				
-									scalePoint = this.unprojectOnTbPlane( this.camera, event.clientX, event.clientY, this.domElement ).applyQuaternion( this.camera.quaternion ).multiplyScalar (1 / this.camera.zoom ).add( this._gizmos.position );
-				
-								} else if ( this.camera.isPerspectiveCamera ) {
-				
-									scalePoint = this.unprojectOnTbPlane( this.camera, event.clientX, event.clientY, this.domElement ).applyQuaternion( this.camera.quaternion ).add( this._gizmos.position );
-				
-								}
-				
-								this.applyTransformMatrix( this.scale( size, scalePoint ) );
-				
-							} else {
-				
-								this.applyTransformMatrix( this.scale( size, this._gizmos.position ) );
-				
-							}
-							
-							if ( this._grid != null )  {
-	
-								this.disposeGrid();
-								this.drawGrid();
-				
-							}
-							
-							this.updateTbState( STATE.IDLE, false );
-							
-							this.dispatchEvent( _changeEvent );
-							this.dispatchEvent( _endEvent );
-	
+
+				}
+
+			};
+
+			this.onPointerMove = event => {
+
+				if ( event.pointerType == 'touch' && this._input != INPUT.CURSOR ) {
+
+					switch ( this._input ) {
+
+						case INPUT.ONE_FINGER:
+							//singleMove
+							this.updateTouchEvent( event );
+							this.onSinglePanMove( event, STATE.ROTATE );
 							break;
-					
-						case 'FOV':
-	
-							if ( this.camera.isPerspectiveCamera ) {
-	
-								this.updateTbState( STATE.FOV, true );
-	
-	
-								//Vertigo effect
-	
-								//	  fov / 2
-								//		|\
-								//		| \
-								//		|  \
-								//	x	|	\
-								//		| 	 \
-								//		| 	  \
-								//		| _ _ _\
-								//			y
-	
-								//check for iOs shift shortcut
-								if ( event.deltaX != 0 ) {
-								
-									sgn = event.deltaX / notchDeltaY;
-								
-									size = 1;
-								
-									if ( sgn > 0 ) {
-									
-										size =  1 / ( Math.pow( this.scaleFactor, sgn ) );
-									
-									} else if ( sgn < 0 ) {
-									
-										size = Math.pow( this.scaleFactor, -sgn );
-									
-									}
-								
-								}
-							
-								this._v3_1.setFromMatrixPosition(this._cameraMatrixState);
-								const x = this._v3_1.distanceTo(this._gizmos.position);
-								let xNew = x / size;	//distance between camera and gizmos if scale(size, scalepoint) would be performed
-							
-								//check min and max distance
-								xNew = THREE.MathUtils.clamp( xNew, this.minDistance, this.maxDistance );
-							
-								const y = x * Math.tan( THREE.MathUtils.DEG2RAD * this.camera.fov * 0.5 );
-							
-								//calculate new fov
-								let newFov = THREE.MathUtils.RAD2DEG * ( Math.atan( y / xNew ) * 2 );
-	
-								//check min and max fov
-								if ( newFov > this.maxFov ) {
-								
-									newFov = this.maxFov;
-								
-								} else if ( newFov < this.minFov ) {
-								
-									newFov = this.minFov;
-								
-								}
-							
-								const newDistance = y / Math.tan( THREE.MathUtils.DEG2RAD * ( newFov / 2 ) );
-								size = x / newDistance;
-							
-								this.setFov( newFov );
-								this.applyTransformMatrix( this.scale( size, this._gizmos.position, false ) );
-	
-							}
-	
-							if ( this._grid != null)  {
-	
-								this.disposeGrid();
-								this.drawGrid();
-				
+
+						case INPUT.ONE_FINGER_SWITCHED:
+							const movement = this.calculatePointersDistance( this._touchCurrent[ 0 ], event ) * this._devPxRatio;
+
+							if ( movement >= this._switchSensibility ) {
+
+								//singleMove
+								this._input = INPUT.ONE_FINGER;
+								this.updateTouchEvent( event );
+								this.onSinglePanStart( event, 'ROTATE' );
+								break;
+
 							}
-							
-							this.updateTbState( STATE.IDLE, false );
-							
-							this.dispatchEvent( _changeEvent );
-							this.dispatchEvent( _endEvent );
-	
+
+							break;
+
+						case INPUT.TWO_FINGER:
+							//rotate/pan/pinchMove
+							this.updateTouchEvent( event );
+							this.onRotateMove();
+							this.onPinchMove();
+							this.onDoublePanMove();
+							break;
+
+						case INPUT.MULT_FINGER:
+							//multMove
+							this.updateTouchEvent( event );
+							this.onTriplePanMove( event );
 							break;
-	
+
 					}
-	
-				}
-	
-			}
-	
-		};
-	
-		onKeyDown = ( event ) => {
-	
-			if ( event.key == 'c' ) {
-	
-				if ( event.ctrlKey || event.metaKey) {
-	
-					this.copyState();
-	
-				}
-	
-			} else if ( event.key == 'v' ) {
-	
-				if ( event.ctrlKey || event.metaKey) {
-	
-					this.pasteState();
-	
-				}
-	
-			}
-	
-		};
-	
-		onSinglePanStart = ( event, operation ) => {
-	
-			if ( this.enabled ) {
-
-				this.dispatchEvent( _startEvent );
-				
-				this.setCenter( event.clientX, event.clientY );
-	
-				switch ( operation ) {
-	
-					case 'PAN':
-					
-						if ( !this.enablePan ) {
-	
-							return;
-	
-						}
-	
-						if (this._animationId != -1) {
-	
-							cancelAnimationFrame( this._animationId );
-							this._animationId = -1;
-							this._timeStart = -1;
-	
-							this.activateGizmos( false );
-							this.dispatchEvent( _changeEvent );
-						
-						}
-	
-						this.updateTbState( STATE.PAN, true );
-						this._startCursorPosition.copy( this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement ) );
-						if ( this.enableGrid ) {
-	
-							this.drawGrid();
-							this.dispatchEvent( _changeEvent );
-	
-						}
-						
-						break;
-				
-					case 'ROTATE':
-						
-						if ( !this.enableRotate ) {
-	
-							return;
-	
-						}
-	
-						if (this._animationId != -1) {
-	
-							cancelAnimationFrame( this._animationId );
-							this._animationId = -1;
-							this._timeStart = -1;
-						
-						}
-	
-						this.updateTbState( STATE.ROTATE, true );
-						this._startCursorPosition.copy( this.unprojectOnTbSurface( this.camera, _center.x, _center.y, this.domElement, this._tbRadius ) );
-						this.activateGizmos( true );
-						if ( this.enableAnimations ) {
-	
-							this._timePrev = this._timeCurrent = performance.now();
-							this._angleCurrent = this._anglePrev = 0;
-							this._cursorPosPrev.copy( this._startCursorPosition );
-							this._cursorPosCurr.copy( this._cursorPosPrev );
-							this._wCurr = 0;
-							this._wPrev = this._wCurr;
-	
+
+				} else if ( event.pointerType != 'touch' && this._input == INPUT.CURSOR ) {
+
+					let modifier = null;
+
+					if ( event.ctrlKey || event.metaKey ) {
+
+						modifier = 'CTRL';
+
+					} else if ( event.shiftKey ) {
+
+						modifier = 'SHIFT';
+
+					}
+
+					const mouseOpState = this.getOpStateFromAction( this._button, modifier );
+
+					if ( mouseOpState != null ) {
+
+						this.onSinglePanMove( event, mouseOpState );
+
+					}
+
+				} //checkDistance
+
+
+				if ( this._downValid ) {
+
+					const movement = this.calculatePointersDistance( this._downEvents[ this._downEvents.length - 1 ], event ) * this._devPxRatio;
+
+					if ( movement > this._movementThreshold ) {
+
+						this._downValid = false;
+
+					}
+
+				}
+
+			};
+
+			this.onPointerUp = event => {
+
+				if ( event.pointerType == 'touch' && this._input != INPUT.CURSOR ) {
+
+					const nTouch = this._touchCurrent.length;
+
+					for ( let i = 0; i < nTouch; i ++ ) {
+
+						if ( this._touchCurrent[ i ].pointerId == event.pointerId ) {
+
+							this._touchCurrent.splice( i, 1 );
+
+							this._touchStart.splice( i, 1 );
+
+							break;
+
 						}
-	
-						this.dispatchEvent( _changeEvent );
-						break;
-	
-						case 'FOV':
-							
-							if ( !this.camera.isPerspectiveCamera || !this.enableZoom ) {
-	
-								return;
-	
-							}
-	
-							if ( this._animationId != -1 ) {
-	
-								cancelAnimationFrame( this._animationId );
-								this._animationId = -1;
-								this._timeStart = -1;
-		
-								this.activateGizmos( false );
-								this.dispatchEvent( _changeEvent );
-							
-							}
-	
-							this.updateTbState( STATE.FOV, true );
-							this._startCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
-							this._currentCursorPosition.copy( this._startCursorPosition );
+
+					}
+
+					switch ( this._input ) {
+
+						case INPUT.ONE_FINGER:
+						case INPUT.ONE_FINGER_SWITCHED:
+							//singleEnd
+							window.removeEventListener( 'pointermove', this.onPointerMove );
+							window.removeEventListener( 'pointerup', this.onPointerUp );
+							this._input = INPUT.NONE;
+							this.onSinglePanEnd();
 							break;
-	
-						case 'ZOOM':
-	
-							if ( !this.enableZoom ) {
-	
-								return;
-	
-							}
-	
-							if ( this._animationId != -1 ) {
-	
-								cancelAnimationFrame( this._animationId );
-								this._animationId = -1;
-								this._timeStart = -1;
-		
-								this.activateGizmos( false );
-								this.dispatchEvent( _changeEvent );
-							
+
+						case INPUT.TWO_FINGER:
+							//doubleEnd
+							this.onDoublePanEnd( event );
+							this.onPinchEnd( event );
+							this.onRotateEnd( event ); //switching to singleStart
+
+							this._input = INPUT.ONE_FINGER_SWITCHED;
+							break;
+
+						case INPUT.MULT_FINGER:
+							if ( this._touchCurrent.length == 0 ) {
+
+								window.removeEventListener( 'pointermove', this.onPointerMove );
+								window.removeEventListener( 'pointerup', this.onPointerUp ); //multCancel
+
+								this._input = INPUT.NONE;
+								this.onTriplePanEnd();
+
 							}
-	
-							this.updateTbState( STATE.SCALE, true );
-							this._startCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
-							this._currentCursorPosition.copy( this._startCursorPosition );
+
 							break;
+
+					}
+
+				} else if ( event.pointerType != 'touch' && this._input == INPUT.CURSOR ) {
+
+					window.removeEventListener( 'pointermove', this.onPointerMove );
+					window.removeEventListener( 'pointerup', this.onPointerUp );
+					this._input = INPUT.NONE;
+					this.onSinglePanEnd();
+					this._button = - 1;
+
 				}
-	
-			}
-	
-		};
-	
-		onSinglePanMove = ( event ) => {
-	
-			if ( this.enabled ) {
-
-				const restart = opState != this._state;
-				this.setCenter( event.clientX, event.clientY );
-	
-				switch ( opState ) {
-	
-					case STATE.PAN:
-	
-						if ( this.enablePan ) {
-	
-							if ( restart ) {
-	
-								//switch to pan operation
-	
-								this.dispatchEvent( _endEvent );
-								this.dispatchEvent( _startEvent );
-			
-								this.updateTbState( opState, true );
-								this._startCursorPosition.copy( this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement ) );
-								if ( this.enableGrid ) {
-			
-									this.drawGrid();
-			
-								}
-	
-								this.activateGizmos( false );
-		
+
+				if ( event.isPrimary ) {
+
+					if ( this._downValid ) {
+
+						const downTime = event.timeStamp - this._downEvents[ this._downEvents.length - 1 ].timeStamp;
+
+						if ( downTime <= this._maxDownTime ) {
+
+							if ( this._nclicks == 0 ) {
+
+								//first valid click detected
+								this._nclicks = 1;
+								this._clickStart = performance.now();
+
 							} else {
-		
-								//continue with pan operation
-								this._currentCursorPosition.copy( this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement ) );
-								this.applyTransformMatrix( this.pan( this._startCursorPosition, this._currentCursorPosition ) );
-		
+
+								const clickInterval = event.timeStamp - this._clickStart;
+
+								const movement = this.calculatePointersDistance( this._downEvents[ 1 ], this._downEvents[ 0 ] ) * this._devPxRatio;
+
+								if ( clickInterval <= this._maxInterval && movement <= this._posThreshold ) {
+
+									//second valid click detected
+									//fire double tap and reset values
+									this._nclicks = 0;
+
+									this._downEvents.splice( 0, this._downEvents.length );
+
+									this.onDoubleTap( event );
+
+								} else {
+
+									//new 'first click'
+									this._nclicks = 1;
+
+									this._downEvents.shift();
+
+									this._clickStart = performance.now();
+
+								}
+
 							}
-	
+
+						} else {
+
+							this._downValid = false;
+							this._nclicks = 0;
+
+							this._downEvents.splice( 0, this._downEvents.length );
+
 						}
-				
-						break;
-				
-					case STATE.ROTATE:
-	
-						if ( this.enableRotate ) {
-	
-							if ( restart ) {
-	
-								//switch to rotate operation
-		
-								this.dispatchEvent( _endEvent );
-								this.dispatchEvent( _startEvent );
-	
-								this.updateTbState( opState, true );
-								this._startCursorPosition.copy( this.unprojectOnTbSurface( this.camera, _center.x, _center.y, this.domElement, this._tbRadius ) );
-			
-								if ( this.enableGrid ) {
-			
-									this.disposeGrid();
-			
+
+					} else {
+
+						this._nclicks = 0;
+
+						this._downEvents.splice( 0, this._downEvents.length );
+
+					}
+
+				}
+
+			};
+
+			this.onWheel = event => {
+
+				if ( this.enabled && this.enableZoom ) {
+
+					let modifier = null;
+
+					if ( event.ctrlKey || event.metaKey ) {
+
+						modifier = 'CTRL';
+
+					} else if ( event.shiftKey ) {
+
+						modifier = 'SHIFT';
+
+					}
+
+					const mouseOp = this.getOpFromAction( 'WHEEL', modifier );
+
+					if ( mouseOp != null ) {
+
+						event.preventDefault();
+						this.dispatchEvent( _startEvent );
+						const notchDeltaY = 125; //distance of one notch of mouse wheel
+
+						let sgn = event.deltaY / notchDeltaY;
+						let size = 1;
+
+						if ( sgn > 0 ) {
+
+							size = 1 / this.scaleFactor;
+
+						} else if ( sgn < 0 ) {
+
+							size = this.scaleFactor;
+
+						}
+
+						switch ( mouseOp ) {
+
+							case 'ZOOM':
+								this.updateTbState( STATE.SCALE, true );
+
+								if ( sgn > 0 ) {
+
+									size = 1 / Math.pow( this.scaleFactor, sgn );
+
+								} else if ( sgn < 0 ) {
+
+									size = Math.pow( this.scaleFactor, - sgn );
+
 								}
-			
-								this.activateGizmos( true );
-		
-							} else {
-		
-								//continue with rotate operation
-								this._currentCursorPosition.copy( this.unprojectOnTbSurface( this.camera, _center.x, _center.y, this.domElement, this._tbRadius ) );
-		
-								const distance = this._startCursorPosition.distanceTo( this._currentCursorPosition );
-								const angle = this._startCursorPosition.angleTo( this._currentCursorPosition );
-								const amount = Math.max( distance / this._tbRadius, angle );  //effective rotation angle
-								
-								this.applyTransformMatrix( this.rotate( this.calculateRotationAxis( this._startCursorPosition, this._currentCursorPosition ), amount ) );
-								
-								if ( this.enableAnimations ) {
-								
-									this._timePrev = this._timeCurrent;
-									this._timeCurrent = performance.now();
-									this._anglePrev = this._angleCurrent;
-									this._angleCurrent = amount;
-									this._cursorPosPrev.copy( this._cursorPosCurr );
-									this._cursorPosCurr.copy( this._currentCursorPosition );
-									this._wPrev = this._wCurr;
-									this._wCurr = this.calculateAngularSpeed( this._anglePrev, this._angleCurrent, this._timePrev, this._timeCurrent );
-								
+
+								if ( this.cursorZoom && this.enablePan ) {
+
+									let scalePoint;
+
+									if ( this.camera.isOrthographicCamera ) {
+
+										scalePoint = this.unprojectOnTbPlane( this.camera, event.clientX, event.clientY, this.domElement ).applyQuaternion( this.camera.quaternion ).multiplyScalar( 1 / this.camera.zoom ).add( this._gizmos.position );
+
+									} else if ( this.camera.isPerspectiveCamera ) {
+
+										scalePoint = this.unprojectOnTbPlane( this.camera, event.clientX, event.clientY, this.domElement ).applyQuaternion( this.camera.quaternion ).add( this._gizmos.position );
+
+									}
+
+									this.applyTransformMatrix( this.scale( size, scalePoint ) );
+
+								} else {
+
+									this.applyTransformMatrix( this.scale( size, this._gizmos.position ) );
+
 								}
-		
-							}
-	
-						}
-	
-						break;
-	
-					case STATE.SCALE:
-					
-						if ( this.enableZoom ) {
-	
-							if ( restart ) {
-	
-								//switch to zoom operation
-	
-								this.dispatchEvent( _endEvent );
-								this.dispatchEvent( _startEvent );
-	
-								this.updateTbState( opState, true );
-								this._startCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
-								this._currentCursorPosition.copy( this._startCursorPosition );
-	
-								if ( this.enableGrid ) {
-			
+
+								if ( this._grid != null ) {
+
 									this.disposeGrid();
-			
-								}
-			
-								this.activateGizmos( false );
-	
-							} else {
-	
-								//continue with zoom operation
-								const screenNotches = 8;	//how many wheel notches corresponds to a full screen pan
-								this._currentCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
-	
-								let movement = this._currentCursorPosition.y - this._startCursorPosition.y;
-	
-								let size = 1 ;
-	
-								if ( movement < 0 ) {
-	
-									size = 1 / ( Math.pow( this.scaleFactor, -movement * screenNotches ) );
-					
-								} else if ( movement > 0 ) {
-					
-									size = Math.pow( this.scaleFactor, movement * screenNotches );
-					
+									this.drawGrid();
+
 								}
-	
-								this.applyTransformMatrix( this.scale( size, this._gizmos.position ) );
-	
-							}
-	
-						}
-	
-						break;
-				
-					case STATE.FOV:
-	
-						if ( this.enableZoom && this.camera.isPerspectiveCamera ) {
-	
-							if ( restart ) {
-	
-								//switch to fov operation
-	
+
+								this.updateTbState( STATE.IDLE, false );
+								this.dispatchEvent( _changeEvent );
 								this.dispatchEvent( _endEvent );
-								this.dispatchEvent( _startEvent );
-	
-								this.updateTbState( opState, true );
-								this._startCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
-								this._currentCursorPosition.copy( this._startCursorPosition );
-	
-								if ( this.enableGrid ) {
-			
-									this.disposeGrid();
-			
+								break;
+
+							case 'FOV':
+								if ( this.camera.isPerspectiveCamera ) {
+
+									this.updateTbState( STATE.FOV, true ); //Vertigo effect
+									//	  fov / 2
+									//		|\
+									//		| \
+									//		|  \
+									//	x	|	\
+									//		| 	 \
+									//		| 	  \
+									//		| _ _ _\
+									//			y
+									//check for iOs shift shortcut
+
+									if ( event.deltaX != 0 ) {
+
+										sgn = event.deltaX / notchDeltaY;
+										size = 1;
+
+										if ( sgn > 0 ) {
+
+											size = 1 / Math.pow( this.scaleFactor, sgn );
+
+										} else if ( sgn < 0 ) {
+
+											size = Math.pow( this.scaleFactor, - sgn );
+
+										}
+
+									}
+
+									this._v3_1.setFromMatrixPosition( this._cameraMatrixState );
+
+									const x = this._v3_1.distanceTo( this._gizmos.position );
+
+									let xNew = x / size; //distance between camera and gizmos if scale(size, scalepoint) would be performed
+									//check min and max distance
+
+									xNew = THREE.MathUtils.clamp( xNew, this.minDistance, this.maxDistance );
+									const y = x * Math.tan( THREE.MathUtils.DEG2RAD * this.camera.fov * 0.5 ); //calculate new fov
+
+									let newFov = THREE.MathUtils.RAD2DEG * ( Math.atan( y / xNew ) * 2 ); //check min and max fov
+
+									if ( newFov > this.maxFov ) {
+
+										newFov = this.maxFov;
+
+									} else if ( newFov < this.minFov ) {
+
+										newFov = this.minFov;
+
+									}
+
+									const newDistance = y / Math.tan( THREE.MathUtils.DEG2RAD * ( newFov / 2 ) );
+									size = x / newDistance;
+									this.setFov( newFov );
+									this.applyTransformMatrix( this.scale( size, this._gizmos.position, false ) );
+
 								}
-			
-								this.activateGizmos( false );
-	
-							} else {
-	
-								//continue with fov operation
-								const screenNotches = 8;	//how many wheel notches corresponds to a full screen pan
-								this._currentCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
-	
-								let movement = this._currentCursorPosition.y - this._startCursorPosition.y;
-	
-								let size = 1 ;
-	
-								if ( movement < 0 ) {
-	
-									size = 1 / ( Math.pow( this.scaleFactor, -movement * screenNotches ) );
-					
-								} else if ( movement > 0 ) {
-					
-									size = Math.pow( this.scaleFactor, movement * screenNotches );
-					
+
+								if ( this._grid != null ) {
+
+									this.disposeGrid();
+									this.drawGrid();
+
 								}
-	
-								this._v3_1.setFromMatrixPosition( this._cameraMatrixState );
-								const x = this._v3_1.distanceTo( this._gizmos.position );
-								let xNew = x / size; //distance between camera and gizmos if scale(size, scalepoint) would be performed
-								
-								//check min and max distance
-								xNew = THREE.MathUtils.clamp( xNew, this.minDistance, this.maxDistance );
-					
-								const y = x * Math.tan( THREE.MathUtils.DEG2RAD * this._fovState * 0.5 );
-					
-								//calculate new fov
-								let newFov = THREE.MathUtils.RAD2DEG * ( Math.atan( y / xNew ) * 2 );
-								
-								//check min and max fov
-								newFov = THREE.MathUtils.clamp( newFov, this.minFov, this.maxFov );
-					
-								const newDistance = y / Math.tan( THREE.MathUtils.DEG2RAD * ( newFov / 2 ) );
-								size = x / newDistance;
-								this._v3_2.setFromMatrixPosition( this._gizmoMatrixState );
-					
-								this.setFov( newFov );
-								this.applyTransformMatrix( this.scale( size, this._v3_2, false ) );
-					
-								//adjusting distance
-								let direction = this._gizmos.position.clone().sub(this.camera.position).normalize().multiplyScalar( newDistance / x );
-								this._m4_1.makeTranslation( direction.x, direction.y, direction.z );
-								
-							}
-	
+
+								this.updateTbState( STATE.IDLE, false );
+								this.dispatchEvent( _changeEvent );
+								this.dispatchEvent( _endEvent );
+								break;
+
 						}
-					
-						break;
-	
-				}
-	
-				this.dispatchEvent( _changeEvent );
-	
-			}
-	
-		};
-	
-		onSinglePanEnd = ( event ) => {
-	
-			if ( this._state == STATE.ROTATE ) {
-
-			
-				if ( !this.enableRotate ) {
-	
-					return;
-	
-				}
-	
-				if ( this.enableAnimations ) {
-	
-					//perform rotation animation
-					const deltaTime = ( performance.now() - this._timeCurrent );
-					if ( deltaTime < 120 ) {
-	
-						let w = Math.abs( ( this._wPrev + this._wCurr ) / 2 );
-	
-						const self = this;
-						this._animationId = window.requestAnimationFrame( function( t ) {
-	
-							self.updateTbState( STATE.ANIMATION_ROTATE, true );
-							const rotationAxis = self.calculateRotationAxis( self._cursorPosPrev, self._cursorPosCurr );
-	
-							self.onRotationAnim( t, rotationAxis, Math.min( w, self.wMax ) );
-	
-						} );
-	
-					} else {
-	
-						//cursor has been standing still for over 120 ms since last movement
-						this.updateTbState( STATE.IDLE, false );
-						this.activateGizmos( false );
-						this.dispatchEvent( _changeEvent );
-	
+
 					}
-	
-				} else {
-	
-					this.updateTbState( STATE.IDLE, false );
-					this.activateGizmos( false );
-					this.dispatchEvent( _changeEvent );
-	
-				}
-	
-			} else if ( this._state == STATE.PAN || this._state == STATE.IDLE ) {
-	
-				this.updateTbState( STATE.IDLE, false );
-	
-				if ( this.enableGrid ) {
-	
-					this.disposeGrid();
-	
+
 				}
-	
-				this.activateGizmos( false );
-				this.dispatchEvent( _changeEvent );
-	
-	
-			}
-	
-			this.dispatchEvent( _endEvent );
-	
-		};
-	
-		onDoubleTap = ( event ) => {
-	
-			if ( this.enabled && this.enablePan && this.scene != null ) {
-	
-				this.dispatchEvent( _startEvent );
-	
-				this.setCenter( event.clientX, event.clientY );
-				const hitP = this.unprojectOnObj( this.getCursorNDC( _center.x, _center.y, this.domElement ), this.camera );
-	
-				if ( hitP != null && this.enableAnimations ) {
-	
-					const self = this;
-					if ( this._animationId != -1) {
-	
-						window.cancelAnimationFrame( this._animationId );
-	
+
+			};
+
+			this.onKeyDown = event => {
+
+				if ( event.key == 'c' ) {
+
+					if ( event.ctrlKey || event.metaKey ) {
+
+						this.copyState();
+
 					}
-	
-					this._timeStart = -1;
-					this._animationId = window.requestAnimationFrame( function( t ) {
-	
-						self.updateTbState( STATE.ANIMATION_FOCUS, true );
-						self.onFocusAnim( t, hitP, self._cameraMatrixState, self._gizmoMatrixState );
-	
-					} );
-	
-				} else if ( hitP != null && !this.enableAnimations ) {
-	
-					this.updateTbState( STATE.FOCUS, true );
-					this.focus( hitP, this.scaleFactor );
-					this.updateTbState( STATE.IDLE, false );
-					this.dispatchEvent (_changeEvent );
-	
+
+				} else if ( event.key == 'v' ) {
+
+					if ( event.ctrlKey || event.metaKey ) {
+
+						this.pasteState();
+
+					}
+
 				}
-	
-			}
-	
-			this.dispatchEvent( _endEvent );
-			
-		};
-	
-		onDoublePanStart = ( event ) => {
-	
-			if ( this.enabled && this.enablePan ) {
-	
-				this.dispatchEvent( _startEvent );
-	
-				this.updateTbState( STATE.PAN, true );
-		
-				this.setCenter( ( this._touchCurrent[ 0 ].clientX + this._touchCurrent[ 1 ].clientX ) / 2, ( this._touchCurrent[ 0 ].clientY + this._touchCurrent[ 1 ].clientY ) / 2 );
-				this._startCursorPosition.copy( this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement, true ) );
-				this._currentCursorPosition.copy( this._startCursorPosition );
-	
-				this.activateGizmos( false );
-	
-			}
-	
-		};
-	
-		onDoublePanMove = ( event ) => {
-	
-			if( this.enabled && this.enablePan ) {
-	
-				this.setCenter( ( this._touchCurrent[ 0 ].clientX + this._touchCurrent[ 1 ].clientX ) / 2, ( this._touchCurrent[ 0 ].clientY + this._touchCurrent[ 1 ].clientY ) / 2 );
-	
-				if ( this._state != STATE.PAN ) {
-	
+
+			};
+
+			this.onSinglePanStart = ( event, operation ) => {
+
+				if ( this.enabled ) {
+
+					this.dispatchEvent( _startEvent );
+					this.setCenter( event.clientX, event.clientY );
+
+					switch ( operation ) {
+
+						case 'PAN':
+							if ( ! this.enablePan ) {
+
+								return;
+
+							}
+
+							if ( this._animationId != - 1 ) {
+
+								cancelAnimationFrame( this._animationId );
+								this._animationId = - 1;
+								this._timeStart = - 1;
+								this.activateGizmos( false );
+								this.dispatchEvent( _changeEvent );
+
+							}
+
+							this.updateTbState( STATE.PAN, true );
+
+							this._startCursorPosition.copy( this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement ) );
+
+							if ( this.enableGrid ) {
+
+								this.drawGrid();
+								this.dispatchEvent( _changeEvent );
+
+							}
+
+							break;
+
+						case 'ROTATE':
+							if ( ! this.enableRotate ) {
+
+								return;
+
+							}
+
+							if ( this._animationId != - 1 ) {
+
+								cancelAnimationFrame( this._animationId );
+								this._animationId = - 1;
+								this._timeStart = - 1;
+
+							}
+
+							this.updateTbState( STATE.ROTATE, true );
+
+							this._startCursorPosition.copy( this.unprojectOnTbSurface( this.camera, _center.x, _center.y, this.domElement, this._tbRadius ) );
+
+							this.activateGizmos( true );
+
+							if ( this.enableAnimations ) {
+
+								this._timePrev = this._timeCurrent = performance.now();
+								this._angleCurrent = this._anglePrev = 0;
+
+								this._cursorPosPrev.copy( this._startCursorPosition );
+
+								this._cursorPosCurr.copy( this._cursorPosPrev );
+
+								this._wCurr = 0;
+								this._wPrev = this._wCurr;
+
+							}
+
+							this.dispatchEvent( _changeEvent );
+							break;
+
+						case 'FOV':
+							if ( ! this.camera.isPerspectiveCamera || ! this.enableZoom ) {
+
+								return;
+
+							}
+
+							if ( this._animationId != - 1 ) {
+
+								cancelAnimationFrame( this._animationId );
+								this._animationId = - 1;
+								this._timeStart = - 1;
+								this.activateGizmos( false );
+								this.dispatchEvent( _changeEvent );
+
+							}
+
+							this.updateTbState( STATE.FOV, true );
+
+							this._startCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
+
+							this._currentCursorPosition.copy( this._startCursorPosition );
+
+							break;
+
+						case 'ZOOM':
+							if ( ! this.enableZoom ) {
+
+								return;
+
+							}
+
+							if ( this._animationId != - 1 ) {
+
+								cancelAnimationFrame( this._animationId );
+								this._animationId = - 1;
+								this._timeStart = - 1;
+								this.activateGizmos( false );
+								this.dispatchEvent( _changeEvent );
+
+							}
+
+							this.updateTbState( STATE.SCALE, true );
+
+							this._startCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
+
+							this._currentCursorPosition.copy( this._startCursorPosition );
+
+							break;
+
+					}
+
+				}
+
+			};
+
+			this.onSinglePanMove = ( event, opState ) => {
+
+				if ( this.enabled ) {
+
+					const restart = opState != this._state;
+					this.setCenter( event.clientX, event.clientY );
+
+					switch ( opState ) {
+
+						case STATE.PAN:
+							if ( this.enablePan ) {
+
+								if ( restart ) {
+
+									//switch to pan operation
+									this.dispatchEvent( _endEvent );
+									this.dispatchEvent( _startEvent );
+									this.updateTbState( opState, true );
+
+									this._startCursorPosition.copy( this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement ) );
+
+									if ( this.enableGrid ) {
+
+										this.drawGrid();
+
+									}
+
+									this.activateGizmos( false );
+
+								} else {
+
+									//continue with pan operation
+									this._currentCursorPosition.copy( this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement ) );
+
+									this.applyTransformMatrix( this.pan( this._startCursorPosition, this._currentCursorPosition ) );
+
+								}
+
+							}
+
+							break;
+
+						case STATE.ROTATE:
+							if ( this.enableRotate ) {
+
+								if ( restart ) {
+
+									//switch to rotate operation
+									this.dispatchEvent( _endEvent );
+									this.dispatchEvent( _startEvent );
+									this.updateTbState( opState, true );
+
+									this._startCursorPosition.copy( this.unprojectOnTbSurface( this.camera, _center.x, _center.y, this.domElement, this._tbRadius ) );
+
+									if ( this.enableGrid ) {
+
+										this.disposeGrid();
+
+									}
+
+									this.activateGizmos( true );
+
+								} else {
+
+									//continue with rotate operation
+									this._currentCursorPosition.copy( this.unprojectOnTbSurface( this.camera, _center.x, _center.y, this.domElement, this._tbRadius ) );
+
+									const distance = this._startCursorPosition.distanceTo( this._currentCursorPosition );
+
+									const angle = this._startCursorPosition.angleTo( this._currentCursorPosition );
+
+									const amount = Math.max( distance / this._tbRadius, angle ); //effective rotation angle
+
+									this.applyTransformMatrix( this.rotate( this.calculateRotationAxis( this._startCursorPosition, this._currentCursorPosition ), amount ) );
+
+									if ( this.enableAnimations ) {
+
+										this._timePrev = this._timeCurrent;
+										this._timeCurrent = performance.now();
+										this._anglePrev = this._angleCurrent;
+										this._angleCurrent = amount;
+
+										this._cursorPosPrev.copy( this._cursorPosCurr );
+
+										this._cursorPosCurr.copy( this._currentCursorPosition );
+
+										this._wPrev = this._wCurr;
+										this._wCurr = this.calculateAngularSpeed( this._anglePrev, this._angleCurrent, this._timePrev, this._timeCurrent );
+
+									}
+
+								}
+
+							}
+
+							break;
+
+						case STATE.SCALE:
+							if ( this.enableZoom ) {
+
+								if ( restart ) {
+
+									//switch to zoom operation
+									this.dispatchEvent( _endEvent );
+									this.dispatchEvent( _startEvent );
+									this.updateTbState( opState, true );
+
+									this._startCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
+
+									this._currentCursorPosition.copy( this._startCursorPosition );
+
+									if ( this.enableGrid ) {
+
+										this.disposeGrid();
+
+									}
+
+									this.activateGizmos( false );
+
+								} else {
+
+									//continue with zoom operation
+									const screenNotches = 8; //how many wheel notches corresponds to a full screen pan
+
+									this._currentCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
+
+									const movement = this._currentCursorPosition.y - this._startCursorPosition.y;
+									let size = 1;
+
+									if ( movement < 0 ) {
+
+										size = 1 / Math.pow( this.scaleFactor, - movement * screenNotches );
+
+									} else if ( movement > 0 ) {
+
+										size = Math.pow( this.scaleFactor, movement * screenNotches );
+
+									}
+
+									this.applyTransformMatrix( this.scale( size, this._gizmos.position ) );
+
+								}
+
+							}
+
+							break;
+
+						case STATE.FOV:
+							if ( this.enableZoom && this.camera.isPerspectiveCamera ) {
+
+								if ( restart ) {
+
+									//switch to fov operation
+									this.dispatchEvent( _endEvent );
+									this.dispatchEvent( _startEvent );
+									this.updateTbState( opState, true );
+
+									this._startCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
+
+									this._currentCursorPosition.copy( this._startCursorPosition );
+
+									if ( this.enableGrid ) {
+
+										this.disposeGrid();
+
+									}
+
+									this.activateGizmos( false );
+
+								} else {
+
+									//continue with fov operation
+									const screenNotches = 8; //how many wheel notches corresponds to a full screen pan
+
+									this._currentCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
+
+									const movement = this._currentCursorPosition.y - this._startCursorPosition.y;
+									let size = 1;
+
+									if ( movement < 0 ) {
+
+										size = 1 / Math.pow( this.scaleFactor, - movement * screenNotches );
+
+									} else if ( movement > 0 ) {
+
+										size = Math.pow( this.scaleFactor, movement * screenNotches );
+
+									}
+
+									this._v3_1.setFromMatrixPosition( this._cameraMatrixState );
+
+									const x = this._v3_1.distanceTo( this._gizmos.position );
+
+									let xNew = x / size; //distance between camera and gizmos if scale(size, scalepoint) would be performed
+									//check min and max distance
+
+									xNew = THREE.MathUtils.clamp( xNew, this.minDistance, this.maxDistance );
+									const y = x * Math.tan( THREE.MathUtils.DEG2RAD * this._fovState * 0.5 ); //calculate new fov
+
+									let newFov = THREE.MathUtils.RAD2DEG * ( Math.atan( y / xNew ) * 2 ); //check min and max fov
+
+									newFov = THREE.MathUtils.clamp( newFov, this.minFov, this.maxFov );
+									const newDistance = y / Math.tan( THREE.MathUtils.DEG2RAD * ( newFov / 2 ) );
+									size = x / newDistance;
+
+									this._v3_2.setFromMatrixPosition( this._gizmoMatrixState );
+
+									this.setFov( newFov );
+									this.applyTransformMatrix( this.scale( size, this._v3_2, false ) ); //adjusting distance
+
+									const direction = this._gizmos.position.clone().sub( this.camera.position ).normalize().multiplyScalar( newDistance / x );
+
+									this._m4_1.makeTranslation( direction.x, direction.y, direction.z );
+
+								}
+
+							}
+
+							break;
+
+					}
+
+					this.dispatchEvent( _changeEvent );
+
+				}
+
+			};
+
+			this.onSinglePanEnd = () => {
+
+				if ( this._state == STATE.ROTATE ) {
+
+					if ( ! this.enableRotate ) {
+
+						return;
+
+					}
+
+					if ( this.enableAnimations ) {
+
+						//perform rotation animation
+						const deltaTime = performance.now() - this._timeCurrent;
+
+						if ( deltaTime < 120 ) {
+
+							const w = Math.abs( ( this._wPrev + this._wCurr ) / 2 );
+							const self = this;
+							this._animationId = window.requestAnimationFrame( function ( t ) {
+
+								self.updateTbState( STATE.ANIMATION_ROTATE, true );
+								const rotationAxis = self.calculateRotationAxis( self._cursorPosPrev, self._cursorPosCurr );
+								self.onRotationAnim( t, rotationAxis, Math.min( w, self.wMax ) );
+
+							} );
+
+						} else {
+
+							//cursor has been standing still for over 120 ms since last movement
+							this.updateTbState( STATE.IDLE, false );
+							this.activateGizmos( false );
+							this.dispatchEvent( _changeEvent );
+
+						}
+
+					} else {
+
+						this.updateTbState( STATE.IDLE, false );
+						this.activateGizmos( false );
+						this.dispatchEvent( _changeEvent );
+
+					}
+
+				} else if ( this._state == STATE.PAN || this._state == STATE.IDLE ) {
+
+					this.updateTbState( STATE.IDLE, false );
+
+					if ( this.enableGrid ) {
+
+						this.disposeGrid();
+
+					}
+
+					this.activateGizmos( false );
+					this.dispatchEvent( _changeEvent );
+
+				}
+
+				this.dispatchEvent( _endEvent );
+
+			};
+
+			this.onDoubleTap = event => {
+
+				if ( this.enabled && this.enablePan && this.scene != null ) {
+
+					this.dispatchEvent( _startEvent );
+					this.setCenter( event.clientX, event.clientY );
+					const hitP = this.unprojectOnObj( this.getCursorNDC( _center.x, _center.y, this.domElement ), this.camera );
+
+					if ( hitP != null && this.enableAnimations ) {
+
+						const self = this;
+
+						if ( this._animationId != - 1 ) {
+
+							window.cancelAnimationFrame( this._animationId );
+
+						}
+
+						this._timeStart = - 1;
+						this._animationId = window.requestAnimationFrame( function ( t ) {
+
+							self.updateTbState( STATE.ANIMATION_FOCUS, true );
+							self.onFocusAnim( t, hitP, self._cameraMatrixState, self._gizmoMatrixState );
+
+						} );
+
+					} else if ( hitP != null && ! this.enableAnimations ) {
+
+						this.updateTbState( STATE.FOCUS, true );
+						this.focus( hitP, this.scaleFactor );
+						this.updateTbState( STATE.IDLE, false );
+						this.dispatchEvent( _changeEvent );
+
+					}
+
+				}
+
+				this.dispatchEvent( _endEvent );
+
+			};
+
+			this.onDoublePanStart = () => {
+
+				if ( this.enabled && this.enablePan ) {
+
+					this.dispatchEvent( _startEvent );
 					this.updateTbState( STATE.PAN, true );
-					this._startCursorPosition.copy( this._currentCursorPosition );
-	
+					this.setCenter( ( this._touchCurrent[ 0 ].clientX + this._touchCurrent[ 1 ].clientX ) / 2, ( this._touchCurrent[ 0 ].clientY + this._touchCurrent[ 1 ].clientY ) / 2 );
+
+					this._startCursorPosition.copy( this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement, true ) );
+
+					this._currentCursorPosition.copy( this._startCursorPosition );
+
+					this.activateGizmos( false );
+
+				}
+
+			};
+
+			this.onDoublePanMove = () => {
+
+				if ( this.enabled && this.enablePan ) {
+
+					this.setCenter( ( this._touchCurrent[ 0 ].clientX + this._touchCurrent[ 1 ].clientX ) / 2, ( this._touchCurrent[ 0 ].clientY + this._touchCurrent[ 1 ].clientY ) / 2 );
+
+					if ( this._state != STATE.PAN ) {
+
+						this.updateTbState( STATE.PAN, true );
+
+						this._startCursorPosition.copy( this._currentCursorPosition );
+
+					}
+
+					this._currentCursorPosition.copy( this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement, true ) );
+
+					this.applyTransformMatrix( this.pan( this._startCursorPosition, this._currentCursorPosition, true ) );
+					this.dispatchEvent( _changeEvent );
+
+				}
+
+			};
+
+			this.onDoublePanEnd = () => {
+
+				this.updateTbState( STATE.IDLE, false );
+				this.dispatchEvent( _endEvent );
+
+			};
+
+			this.onRotateStart = () => {
+
+				if ( this.enabled && this.enableRotate ) {
+
+					this.dispatchEvent( _startEvent );
+					this.updateTbState( STATE.ZROTATE, true ); //this._startFingerRotation = event.rotation;
+
+					this._startFingerRotation = this.getAngle( this._touchCurrent[ 1 ], this._touchCurrent[ 0 ] ) + this.getAngle( this._touchStart[ 1 ], this._touchStart[ 0 ] );
+					this._currentFingerRotation = this._startFingerRotation;
+					this.camera.getWorldDirection( this._rotationAxis ); //rotation axis
+
+					if ( ! this.enablePan && ! this.enableZoom ) {
+
+						this.activateGizmos( true );
+
+					}
+
+				}
+
+			};
+
+			this.onRotateMove = () => {
+
+				if ( this.enabled && this.enableRotate ) {
+
+					this.setCenter( ( this._touchCurrent[ 0 ].clientX + this._touchCurrent[ 1 ].clientX ) / 2, ( this._touchCurrent[ 0 ].clientY + this._touchCurrent[ 1 ].clientY ) / 2 );
+					let rotationPoint;
+
+					if ( this._state != STATE.ZROTATE ) {
+
+						this.updateTbState( STATE.ZROTATE, true );
+						this._startFingerRotation = this._currentFingerRotation;
+
+					} //this._currentFingerRotation = event.rotation;
+
+
+					this._currentFingerRotation = this.getAngle( this._touchCurrent[ 1 ], this._touchCurrent[ 0 ] ) + this.getAngle( this._touchStart[ 1 ], this._touchStart[ 0 ] );
+
+					if ( ! this.enablePan ) {
+
+						rotationPoint = new THREE.Vector3().setFromMatrixPosition( this._gizmoMatrixState );
+
+					} else {
+
+						this._v3_2.setFromMatrixPosition( this._gizmoMatrixState );
+
+						rotationPoint = this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement ).applyQuaternion( this.camera.quaternion ).multiplyScalar( 1 / this.camera.zoom ).add( this._v3_2 );
+
+					}
+
+					const amount = THREE.MathUtils.DEG2RAD * ( this._startFingerRotation - this._currentFingerRotation );
+					this.applyTransformMatrix( this.zRotate( rotationPoint, amount ) );
+					this.dispatchEvent( _changeEvent );
+
+				}
+
+			};
+
+			this.onRotateEnd = () => {
+
+				this.updateTbState( STATE.IDLE, false );
+				this.activateGizmos( false );
+				this.dispatchEvent( _endEvent );
+
+			};
+
+			this.onPinchStart = () => {
+
+				if ( this.enabled && this.enableZoom ) {
+
+					this.dispatchEvent( _startEvent );
+					this.updateTbState( STATE.SCALE, true );
+					this._startFingerDistance = this.calculatePointersDistance( this._touchCurrent[ 0 ], this._touchCurrent[ 1 ] );
+					this._currentFingerDistance = this._startFingerDistance;
+					this.activateGizmos( false );
+
+				}
+
+			};
+
+			this.onPinchMove = () => {
+
+				if ( this.enabled && this.enableZoom ) {
+
+					this.setCenter( ( this._touchCurrent[ 0 ].clientX + this._touchCurrent[ 1 ].clientX ) / 2, ( this._touchCurrent[ 0 ].clientY + this._touchCurrent[ 1 ].clientY ) / 2 );
+					const minDistance = 12; //minimum distance between fingers (in css pixels)
+
+					if ( this._state != STATE.SCALE ) {
+
+						this._startFingerDistance = this._currentFingerDistance;
+						this.updateTbState( STATE.SCALE, true );
+
+					}
+
+					this._currentFingerDistance = Math.max( this.calculatePointersDistance( this._touchCurrent[ 0 ], this._touchCurrent[ 1 ] ), minDistance * this._devPxRatio );
+					const amount = this._currentFingerDistance / this._startFingerDistance;
+					let scalePoint;
+
+					if ( ! this.enablePan ) {
+
+						scalePoint = this._gizmos.position;
+
+					} else {
+
+						if ( this.camera.isOrthographicCamera ) {
+
+							scalePoint = this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement ).applyQuaternion( this.camera.quaternion ).multiplyScalar( 1 / this.camera.zoom ).add( this._gizmos.position );
+
+						} else if ( this.camera.isPerspectiveCamera ) {
+
+							scalePoint = this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement ).applyQuaternion( this.camera.quaternion ).add( this._gizmos.position );
+
+						}
+
+					}
+
+					this.applyTransformMatrix( this.scale( amount, scalePoint ) );
+					this.dispatchEvent( _changeEvent );
+
+				}
+
+			};
+
+			this.onPinchEnd = () => {
+
+				this.updateTbState( STATE.IDLE, false );
+				this.dispatchEvent( _endEvent );
+
+			};
+
+			this.onTriplePanStart = () => {
+
+				if ( this.enabled && this.enableZoom ) {
+
+					this.dispatchEvent( _startEvent );
+					this.updateTbState( STATE.SCALE, true ); //const center = event.center;
+
+					let clientX = 0;
+					let clientY = 0;
+					const nFingers = this._touchCurrent.length;
+
+					for ( let i = 0; i < nFingers; i ++ ) {
+
+						clientX += this._touchCurrent[ i ].clientX;
+						clientY += this._touchCurrent[ i ].clientY;
+
+					}
+
+					this.setCenter( clientX / nFingers, clientY / nFingers );
+
+					this._startCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
+
+					this._currentCursorPosition.copy( this._startCursorPosition );
+
+				}
+
+			};
+
+			this.onTriplePanMove = () => {
+
+				if ( this.enabled && this.enableZoom ) {
+
+					//	  fov / 2
+					//		|\
+					//		| \
+					//		|  \
+					//	x	|	\
+					//		| 	 \
+					//		| 	  \
+					//		| _ _ _\
+					//			y
+					//const center = event.center;
+					let clientX = 0;
+					let clientY = 0;
+					const nFingers = this._touchCurrent.length;
+
+					for ( let i = 0; i < nFingers; i ++ ) {
+
+						clientX += this._touchCurrent[ i ].clientX;
+						clientY += this._touchCurrent[ i ].clientY;
+
+					}
+
+					this.setCenter( clientX / nFingers, clientY / nFingers );
+					const screenNotches = 8; //how many wheel notches corresponds to a full screen pan
+
+					this._currentCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
+
+					const movement = this._currentCursorPosition.y - this._startCursorPosition.y;
+					let size = 1;
+
+					if ( movement < 0 ) {
+
+						size = 1 / Math.pow( this.scaleFactor, - movement * screenNotches );
+
+					} else if ( movement > 0 ) {
+
+						size = Math.pow( this.scaleFactor, movement * screenNotches );
+
+					}
+
+					this._v3_1.setFromMatrixPosition( this._cameraMatrixState );
+
+					const x = this._v3_1.distanceTo( this._gizmos.position );
+
+					let xNew = x / size; //distance between camera and gizmos if scale(size, scalepoint) would be performed
+					//check min and max distance
+
+					xNew = THREE.MathUtils.clamp( xNew, this.minDistance, this.maxDistance );
+					const y = x * Math.tan( THREE.MathUtils.DEG2RAD * this._fovState * 0.5 ); //calculate new fov
+
+					let newFov = THREE.MathUtils.RAD2DEG * ( Math.atan( y / xNew ) * 2 ); //check min and max fov
+
+					newFov = THREE.MathUtils.clamp( newFov, this.minFov, this.maxFov );
+					const newDistance = y / Math.tan( THREE.MathUtils.DEG2RAD * ( newFov / 2 ) );
+					size = x / newDistance;
+
+					this._v3_2.setFromMatrixPosition( this._gizmoMatrixState );
+
+					this.setFov( newFov );
+					this.applyTransformMatrix( this.scale( size, this._v3_2, false ) ); //adjusting distance
+
+					const direction = this._gizmos.position.clone().sub( this.camera.position ).normalize().multiplyScalar( newDistance / x );
+
+					this._m4_1.makeTranslation( direction.x, direction.y, direction.z );
+
+					this.dispatchEvent( _changeEvent );
+
+				}
+
+			};
+
+			this.onTriplePanEnd = () => {
+
+				this.updateTbState( STATE.IDLE, false );
+				this.dispatchEvent( _endEvent ); //this.dispatchEvent( _changeEvent );
+
+			};
+
+			this.setCenter = ( clientX, clientY ) => {
+
+				_center.x = clientX;
+				_center.y = clientY;
+
+			};
+
+			this.initializeMouseActions = () => {
+
+				this.setMouseAction( 'PAN', 0, 'CTRL' );
+				this.setMouseAction( 'PAN', 2 );
+				this.setMouseAction( 'ROTATE', 0 );
+				this.setMouseAction( 'ZOOM', 'WHEEL' );
+				this.setMouseAction( 'ZOOM', 1 );
+				this.setMouseAction( 'FOV', 'WHEEL', 'SHIFT' );
+				this.setMouseAction( 'FOV', 1, 'SHIFT' );
+
+			};
+
+			this.compareMouseAction = ( action1, action2 ) => {
+
+				if ( action1.operation == action2.operation ) {
+
+					if ( action1.mouse == action2.mouse && action1.key == action2.key ) {
+
+						return true;
+
+					} else {
+
+						return false;
+
+					}
+
+				} else {
+
+					return false;
+
+				}
+
+			};
+
+			this.setMouseAction = ( operation, mouse, key = null ) => {
+
+				const operationInput = [ 'PAN', 'ROTATE', 'ZOOM', 'FOV' ];
+				const mouseInput = [ 0, 1, 2, 'WHEEL' ];
+				const keyInput = [ 'CTRL', 'SHIFT', null ];
+				let state;
+
+				if ( ! operationInput.includes( operation ) || ! mouseInput.includes( mouse ) || ! keyInput.includes( key ) ) {
+
+					//invalid parameters
+					return false;
+
+				}
+
+				if ( mouse == 'WHEEL' ) {
+
+					if ( operation != 'ZOOM' && operation != 'FOV' ) {
+
+						//cannot associate 2D operation to 1D input
+						return false;
+
+					}
+
+				}
+
+				switch ( operation ) {
+
+					case 'PAN':
+						state = STATE.PAN;
+						break;
+
+					case 'ROTATE':
+						state = STATE.ROTATE;
+						break;
+
+					case 'ZOOM':
+						state = STATE.SCALE;
+						break;
+
+					case 'FOV':
+						state = STATE.FOV;
+						break;
+
+				}
+
+				const action = {
+					operation: operation,
+					mouse: mouse,
+					key: key,
+					state: state
+				};
+
+				for ( let i = 0; i < this.mouseActions.length; i ++ ) {
+
+					if ( this.mouseActions[ i ].mouse == action.mouse && this.mouseActions[ i ].key == action.key ) {
+
+						this.mouseActions.splice( i, 1, action );
+						return true;
+
+					}
+
+				}
+
+				this.mouseActions.push( action );
+				return true;
+
+			};
+
+			this.unsetMouseAction = ( mouse, key = null ) => {
+
+				for ( let i = 0; i < this.mouseActions.length; i ++ ) {
+
+					if ( this.mouseActions[ i ].mouse == mouse && this.mouseActions[ i ].key == key ) {
+
+						this.mouseActions.splice( i, 1 );
+						return true;
+
+					}
+
+				}
+
+				return false;
+
+			};
+
+			this.getOpFromAction = ( mouse, key ) => {
+
+				let action;
+
+				for ( let i = 0; i < this.mouseActions.length; i ++ ) {
+
+					action = this.mouseActions[ i ];
+
+					if ( action.mouse == mouse && action.key == key ) {
+
+						return action.operation;
+
+					}
+
+				}
+
+				if ( key != null ) {
+
+					for ( let i = 0; i < this.mouseActions.length; i ++ ) {
+
+						action = this.mouseActions[ i ];
+
+						if ( action.mouse == mouse && action.key == null ) {
+
+							return action.operation;
+
+						}
+
+					}
+
+				}
+
+				return null;
+
+			};
+
+			this.getOpStateFromAction = ( mouse, key ) => {
+
+				let action;
+
+				for ( let i = 0; i < this.mouseActions.length; i ++ ) {
+
+					action = this.mouseActions[ i ];
+
+					if ( action.mouse == mouse && action.key == key ) {
+
+						return action.state;
+
+					}
+
+				}
+
+				if ( key != null ) {
+
+					for ( let i = 0; i < this.mouseActions.length; i ++ ) {
+
+						action = this.mouseActions[ i ];
+
+						if ( action.mouse == mouse && action.key == null ) {
+
+							return action.state;
+
+						}
+
+					}
+
+				}
+
+				return null;
+
+			};
+
+			this.getAngle = ( p1, p2 ) => {
+
+				return Math.atan2( p2.clientY - p1.clientY, p2.clientX - p1.clientX ) * 180 / Math.PI;
+
+			};
+
+			this.updateTouchEvent = event => {
+
+				for ( let i = 0; i < this._touchCurrent.length; i ++ ) {
+
+					if ( this._touchCurrent[ i ].pointerId == event.pointerId ) {
+
+						this._touchCurrent.splice( i, 1, event );
+
+						break;
+
+					}
+
+				}
+
+			};
+
+			this.calculateAngularSpeed = ( p0, p1, t0, t1 ) => {
+
+				const s = p1 - p0;
+				const t = ( t1 - t0 ) / 1000;
+
+				if ( t == 0 ) {
+
+					return 0;
+
+				}
+
+				return s / t;
+
+			};
+
+			this.calculatePointersDistance = ( p0, p1 ) => {
+
+				return Math.sqrt( Math.pow( p1.clientX - p0.clientX, 2 ) + Math.pow( p1.clientY - p0.clientY, 2 ) );
+
+			};
+
+			this.calculateRotationAxis = ( vec1, vec2 ) => {
+
+				this._rotationMatrix.extractRotation( this._cameraMatrixState );
+
+				this._quat.setFromRotationMatrix( this._rotationMatrix );
+
+				this._rotationAxis.crossVectors( vec1, vec2 ).applyQuaternion( this._quat );
+
+				return this._rotationAxis.normalize().clone();
+
+			};
+
+			this.calculateTbRadius = camera => {
+
+				const factor = 0.67;
+				const distance = camera.position.distanceTo( this._gizmos.position );
+
+				if ( camera.type == 'PerspectiveCamera' ) {
+
+					const halfFovV = THREE.MathUtils.DEG2RAD * camera.fov * 0.5; //vertical fov/2 in radians
+
+					const halfFovH = Math.atan( camera.aspect * Math.tan( halfFovV ) ); //horizontal fov/2 in radians
+
+					return Math.tan( Math.min( halfFovV, halfFovH ) ) * distance * factor;
+
+				} else if ( camera.type == 'OrthographicCamera' ) {
+
+					return Math.min( camera.top, camera.right ) * factor;
+
+				}
+
+			};
+
+			this.focus = ( point, size, amount = 1 ) => {
+
+				const focusPoint = point.clone(); //move center of camera (along with gizmos) towards point of interest
+
+				focusPoint.sub( this._gizmos.position ).multiplyScalar( amount );
+
+				this._translationMatrix.makeTranslation( focusPoint.x, focusPoint.y, focusPoint.z );
+
+				const gizmoStateTemp = this._gizmoMatrixState.clone();
+
+				this._gizmoMatrixState.premultiply( this._translationMatrix );
+
+				this._gizmoMatrixState.decompose( this._gizmos.position, this._gizmos.quaternion, this._gizmos.scale );
+
+				const cameraStateTemp = this._cameraMatrixState.clone();
+
+				this._cameraMatrixState.premultiply( this._translationMatrix );
+
+				this._cameraMatrixState.decompose( this.camera.position, this.camera.quaternion, this.camera.scale ); //apply zoom
+
+
+				if ( this.enableZoom ) {
+
+					this.applyTransformMatrix( this.scale( size, this._gizmos.position ) );
+
+				}
+
+				this._gizmoMatrixState.copy( gizmoStateTemp );
+
+				this._cameraMatrixState.copy( cameraStateTemp );
+
+			};
+
+			this.drawGrid = () => {
+
+				if ( this.scene != null ) {
+
+					const color = 0x888888;
+					const multiplier = 3;
+					let size, divisions, maxLength, tick;
+
+					if ( this.camera.isOrthographicCamera ) {
+
+						const width = this.camera.right - this.camera.left;
+						const height = this.camera.bottom - this.camera.top;
+						maxLength = Math.max( width, height );
+						tick = maxLength / 20;
+						size = maxLength / this.camera.zoom * multiplier;
+						divisions = size / tick * this.camera.zoom;
+
+					} else if ( this.camera.isPerspectiveCamera ) {
+
+						const distance = this.camera.position.distanceTo( this._gizmos.position );
+						const halfFovV = THREE.MathUtils.DEG2RAD * this.camera.fov * 0.5;
+						const halfFovH = Math.atan( this.camera.aspect * Math.tan( halfFovV ) );
+						maxLength = Math.tan( Math.max( halfFovV, halfFovH ) ) * distance * 2;
+						tick = maxLength / 20;
+						size = maxLength * multiplier;
+						divisions = size / tick;
+
+					}
+
+					if ( this._grid == null ) {
+
+						this._grid = new THREE.GridHelper( size, divisions, color, color );
+
+						this._grid.position.copy( this._gizmos.position );
+
+						this._gridPosition.copy( this._grid.position );
+
+						this._grid.quaternion.copy( this.camera.quaternion );
+
+						this._grid.rotateX( Math.PI * 0.5 );
+
+						this.scene.add( this._grid );
+
+					}
+
+				}
+
+			};
+
+			this.dispose = () => {
+
+				if ( this._animationId != - 1 ) {
+
+					window.cancelAnimationFrame( this._animationId );
+
+				}
+
+				this.domElement.removeEventListener( 'pointerdown', this.onPointerDown );
+				this.domElement.removeEventListener( 'pointercancel', this.onPointerCancel );
+				this.domElement.removeEventListener( 'wheel', this.onWheel );
+				this.domElement.removeEventListener( 'contextmenu', this.onContextMenu );
+				window.removeEventListener( 'pointermove', this.onPointerMove );
+				window.removeEventListener( 'pointerup', this.onPointerUp );
+				window.removeEventListener( 'resize', this.onWindowResize );
+				window.addEventListener( 'keydown', this.onKeyDown );
+				this.scene.remove( this._gizmos );
+				this.disposeGrid();
+
+			};
+
+			this.disposeGrid = () => {
+
+				if ( this._grid != null && this.scene != null ) {
+
+					this.scene.remove( this._grid );
+					this._grid = null;
+
+				}
+
+			};
+
+			this.easeOutCubic = t => {
+
+				return 1 - Math.pow( 1 - t, 3 );
+
+			};
+
+			this.activateGizmos = isActive => {
+
+				const gizmoX = this._gizmos.children[ 0 ];
+				const gizmoY = this._gizmos.children[ 1 ];
+				const gizmoZ = this._gizmos.children[ 2 ];
+
+				if ( isActive ) {
+
+					gizmoX.material.setValues( {
+						opacity: 1
+					} );
+					gizmoY.material.setValues( {
+						opacity: 1
+					} );
+					gizmoZ.material.setValues( {
+						opacity: 1
+					} );
+
+				} else {
+
+					gizmoX.material.setValues( {
+						opacity: 0.6
+					} );
+					gizmoY.material.setValues( {
+						opacity: 0.6
+					} );
+					gizmoZ.material.setValues( {
+						opacity: 0.6
+					} );
+
+				}
+
+			};
+
+			this.getCursorNDC = ( cursorX, cursorY, canvas ) => {
+
+				const canvasRect = canvas.getBoundingClientRect();
+
+				this._v2_1.setX( ( cursorX - canvasRect.left ) / canvasRect.width * 2 - 1 );
+
+				this._v2_1.setY( ( canvasRect.bottom - cursorY ) / canvasRect.height * 2 - 1 );
+
+				return this._v2_1.clone();
+
+			};
+
+			this.getCursorPosition = ( cursorX, cursorY, canvas ) => {
+
+				this._v2_1.copy( this.getCursorNDC( cursorX, cursorY, canvas ) );
+
+				this._v2_1.x *= ( this.camera.right - this.camera.left ) * 0.5;
+				this._v2_1.y *= ( this.camera.top - this.camera.bottom ) * 0.5;
+				return this._v2_1.clone();
+
+			};
+
+			this.setCamera = camera => {
+
+				camera.lookAt( this._tbCenter );
+				camera.updateMatrix(); //setting state
+
+				if ( camera.type == 'PerspectiveCamera' ) {
+
+					this._fov0 = camera.fov;
+					this._fovState = camera.fov;
+
+				}
+
+				this._cameraMatrixState0.copy( camera.matrix );
+
+				this._cameraMatrixState.copy( this._cameraMatrixState0 );
+
+				this._cameraProjectionState.copy( camera.projectionMatrix );
+
+				this._zoom0 = camera.zoom;
+				this._zoomState = this._zoom0;
+				this._initialNear = camera.near;
+				this._nearPos0 = camera.position.distanceTo( this._tbCenter ) - camera.near;
+				this._nearPos = this._initialNear;
+				this._initialFar = camera.far;
+				this._farPos0 = camera.position.distanceTo( this._tbCenter ) - camera.far;
+				this._farPos = this._initialFar;
+
+				this._up0.copy( camera.up );
+
+				this._upState.copy( camera.up );
+
+				this.camera = camera;
+				this.camera.updateProjectionMatrix(); //making gizmos
+
+				this._tbRadius = this.calculateTbRadius( camera );
+				this.makeGizmos( this._tbCenter, this._tbRadius );
+
+			};
+
+			this.makeGizmos = ( tbCenter, tbRadius ) => {
+
+				const curve = new THREE.EllipseCurve( 0, 0, tbRadius, tbRadius );
+				const points = curve.getPoints( this._curvePts ); //geometry
+
+				const curveGeometry = new THREE.BufferGeometry().setFromPoints( points ); //material
+
+				const curveMaterialX = new THREE.LineBasicMaterial( {
+					color: 0xff8080,
+					fog: false,
+					transparent: true,
+					opacity: 0.6
+				} );
+				const curveMaterialY = new THREE.LineBasicMaterial( {
+					color: 0x80ff80,
+					fog: false,
+					transparent: true,
+					opacity: 0.6
+				} );
+				const curveMaterialZ = new THREE.LineBasicMaterial( {
+					color: 0x8080ff,
+					fog: false,
+					transparent: true,
+					opacity: 0.6
+				} ); //line
+
+				const gizmoX = new THREE.Line( curveGeometry, curveMaterialX );
+				const gizmoY = new THREE.Line( curveGeometry, curveMaterialY );
+				const gizmoZ = new THREE.Line( curveGeometry, curveMaterialZ );
+				const rotation = Math.PI * 0.5;
+				gizmoX.rotation.x = rotation;
+				gizmoY.rotation.y = rotation; //setting state
+
+				this._gizmoMatrixState0.identity().setPosition( tbCenter );
+
+				this._gizmoMatrixState.copy( this._gizmoMatrixState0 );
+
+				if ( this.camera.zoom != 1 ) {
+
+					//adapt gizmos size to camera zoom
+					const size = 1 / this.camera.zoom;
+
+					this._scaleMatrix.makeScale( size, size, size );
+
+					this._translationMatrix.makeTranslation( - tbCenter.x, - tbCenter.y, - tbCenter.z );
+
+					this._gizmoMatrixState.premultiply( this._translationMatrix ).premultiply( this._scaleMatrix );
+
+					this._translationMatrix.makeTranslation( tbCenter.x, tbCenter.y, tbCenter.z );
+
+					this._gizmoMatrixState.premultiply( this._translationMatrix );
+
+				}
+
+				this._gizmoMatrixState.decompose( this._gizmos.position, this._gizmos.quaternion, this._gizmos.scale );
+
+				this._gizmos.clear();
+
+				this._gizmos.add( gizmoX );
+
+				this._gizmos.add( gizmoY );
+
+				this._gizmos.add( gizmoZ );
+
+			};
+
+			this.onFocusAnim = ( time, point, cameraMatrix, gizmoMatrix ) => {
+
+				if ( this._timeStart == - 1 ) {
+
+					//animation start
+					this._timeStart = time;
+
+				}
+
+				if ( this._state == STATE.ANIMATION_FOCUS ) {
+
+					const deltaTime = time - this._timeStart;
+					const animTime = deltaTime / this.focusAnimationTime;
+
+					this._gizmoMatrixState.copy( gizmoMatrix );
+
+					if ( animTime >= 1 ) {
+
+						//animation end
+						this._gizmoMatrixState.decompose( this._gizmos.position, this._gizmos.quaternion, this._gizmos.scale );
+
+						this.focus( point, this.scaleFactor );
+						this._timeStart = - 1;
+						this.updateTbState( STATE.IDLE, false );
+						this.activateGizmos( false );
+						this.dispatchEvent( _changeEvent );
+
+					} else {
+
+						const amount = this.easeOutCubic( animTime );
+						const size = 1 - amount + this.scaleFactor * amount;
+
+						this._gizmoMatrixState.decompose( this._gizmos.position, this._gizmos.quaternion, this._gizmos.scale );
+
+						this.focus( point, size, amount );
+						this.dispatchEvent( _changeEvent );
+						const self = this;
+						this._animationId = window.requestAnimationFrame( function ( t ) {
+
+							self.onFocusAnim( t, point, cameraMatrix, gizmoMatrix.clone() );
+
+						} );
+
+					}
+
+				} else {
+
+					//interrupt animation
+					this._animationId = - 1;
+					this._timeStart = - 1;
+
+				}
+
+			};
+
+			this.onRotationAnim = ( time, rotationAxis, w0 ) => {
+
+				if ( this._timeStart == - 1 ) {
+
+					//animation start
+					this._anglePrev = 0;
+					this._angleCurrent = 0;
+					this._timeStart = time;
+
+				}
+
+				if ( this._state == STATE.ANIMATION_ROTATE ) {
+
+					//w = w0 + alpha * t
+					const deltaTime = ( time - this._timeStart ) / 1000;
+					const w = w0 + - this.dampingFactor * deltaTime;
+
+					if ( w > 0 ) {
+
+						//tetha = 0.5 * alpha * t^2 + w0 * t + tetha0
+						this._angleCurrent = 0.5 * - this.dampingFactor * Math.pow( deltaTime, 2 ) + w0 * deltaTime + 0;
+						this.applyTransformMatrix( this.rotate( rotationAxis, this._angleCurrent ) );
+						this.dispatchEvent( _changeEvent );
+						const self = this;
+						this._animationId = window.requestAnimationFrame( function ( t ) {
+
+							self.onRotationAnim( t, rotationAxis, w0 );
+
+						} );
+
+					} else {
+
+						this._animationId = - 1;
+						this._timeStart = - 1;
+						this.updateTbState( STATE.IDLE, false );
+						this.activateGizmos( false );
+						this.dispatchEvent( _changeEvent );
+
+					}
+
+				} else {
+
+					//interrupt animation
+					this._animationId = - 1;
+					this._timeStart = - 1;
+
+					if ( this._state != STATE.ROTATE ) {
+
+						this.activateGizmos( false );
+						this.dispatchEvent( _changeEvent );
+
+					}
+
+				}
+
+			};
+
+			this.pan = ( p0, p1, adjust = false ) => {
+
+				const movement = p0.clone().sub( p1 );
+
+				if ( this.camera.isOrthographicCamera ) {
+
+					//adjust movement amount
+					movement.multiplyScalar( 1 / this.camera.zoom );
+
+				} else if ( this.camera.isPerspectiveCamera && adjust ) {
+
+					//adjust movement amount
+					this._v3_1.setFromMatrixPosition( this._cameraMatrixState0 ); //camera's initial position
+
+
+					this._v3_2.setFromMatrixPosition( this._gizmoMatrixState0 ); //gizmo's initial position
+
+
+					const distanceFactor = this._v3_1.distanceTo( this._v3_2 ) / this.camera.position.distanceTo( this._gizmos.position );
+					movement.multiplyScalar( 1 / distanceFactor );
+
+				}
+
+				this._v3_1.set( movement.x, movement.y, 0 ).applyQuaternion( this.camera.quaternion );
+
+				this._m4_1.makeTranslation( this._v3_1.x, this._v3_1.y, this._v3_1.z );
+
+				this.setTransformationMatrices( this._m4_1, this._m4_1 );
+				return _transformation;
+
+			};
+
+			this.reset = () => {
+
+				this.camera.zoom = this._zoom0;
+
+				if ( this.camera.isPerspectiveCamera ) {
+
+					this.camera.fov = this._fov0;
+
 				}
-		
-				this._currentCursorPosition.copy( this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement, true ) );
-				this.applyTransformMatrix( this.pan( this._startCursorPosition, this._currentCursorPosition, true ) );
+
+				this.camera.near = this._nearPos;
+				this.camera.far = this._farPos;
+
+				this._cameraMatrixState.copy( this._cameraMatrixState0 );
+
+				this._cameraMatrixState.decompose( this.camera.position, this.camera.quaternion, this.camera.scale );
+
+				this.camera.up.copy( this._up0 );
+				this.camera.updateMatrix();
+				this.camera.updateProjectionMatrix();
+
+				this._gizmoMatrixState.copy( this._gizmoMatrixState0 );
+
+				this._gizmoMatrixState0.decompose( this._gizmos.position, this._gizmos.quaternion, this._gizmos.scale );
+
+				this._gizmos.updateMatrix();
+
+				this._tbRadius = this.calculateTbRadius( this.camera );
+				this.makeGizmos( this._gizmos.position, this._tbRadius );
+				this.camera.lookAt( this._gizmos.position );
+				this.updateTbState( STATE.IDLE, false );
 				this.dispatchEvent( _changeEvent );
-			}
-	
-		};
-	
-		onDoublePanEnd = ( event ) => {
-	
-			this.updateTbState( STATE.IDLE, false );
-			this.dispatchEvent( _endEvent );
-	
-		};
-	
-	
-		onRotateStart = ( event ) => {
-	
-			if ( this.enabled && this.enableRotate ) {
-	
-				this.dispatchEvent( _startEvent );
-	
-				this.updateTbState( STATE.ZROTATE, true );
-	
-				//this._startFingerRotation = event.rotation;
-	
-				this._startFingerRotation = this.getAngle( this._touchCurrent[ 1 ], this._touchCurrent[ 0 ] ) + this.getAngle( this._touchStart[ 1 ], this._touchStart[ 0 ] );
-				this._currentFingerRotation = this._startFingerRotation;
-	
-				this.camera.getWorldDirection( this._rotationAxis );  //rotation axis
-	
-				if ( !this.enablePan && !this.enableZoom ) {
-	
-					this.activateGizmos( true );
-	
+
+			};
+
+			this.rotate = ( axis, angle ) => {
+
+				const point = this._gizmos.position; //rotation center
+
+				this._translationMatrix.makeTranslation( - point.x, - point.y, - point.z );
+
+				this._rotationMatrix.makeRotationAxis( axis, - angle ); //rotate camera
+
+
+				this._m4_1.makeTranslation( point.x, point.y, point.z );
+
+				this._m4_1.multiply( this._rotationMatrix );
+
+				this._m4_1.multiply( this._translationMatrix );
+
+				this.setTransformationMatrices( this._m4_1 );
+				return _transformation;
+
+			};
+
+			this.copyState = () => {
+
+				let state;
+
+				if ( this.camera.isOrthographicCamera ) {
+
+					state = JSON.stringify( {
+						arcballState: {
+							cameraFar: this.camera.far,
+							cameraMatrix: this.camera.matrix,
+							cameraNear: this.camera.near,
+							cameraUp: this.camera.up,
+							cameraZoom: this.camera.zoom,
+							gizmoMatrix: this._gizmos.matrix
+						}
+					} );
+
+				} else if ( this.camera.isPerspectiveCamera ) {
+
+					state = JSON.stringify( {
+						arcballState: {
+							cameraFar: this.camera.far,
+							cameraFov: this.camera.fov,
+							cameraMatrix: this.camera.matrix,
+							cameraNear: this.camera.near,
+							cameraUp: this.camera.up,
+							cameraZoom: this.camera.zoom,
+							gizmoMatrix: this._gizmos.matrix
+						}
+					} );
+
 				}
-	
-			}
-	
-		};
-	
-		onRotateMove = ( event ) => {
-	
-			if ( this.enabled && this.enableRotate ) {
-	
-				this.setCenter( ( this._touchCurrent[ 0 ].clientX + this._touchCurrent[ 1 ].clientX ) / 2, ( this._touchCurrent[ 0 ].clientY + this._touchCurrent[ 1 ].clientY ) / 2 );
-				let rotationPoint;
-		
-				if ( this._state != STATE.ZROTATE ) {
-	
-					this.updateTbState( STATE.ZROTATE, true );
-					this._startFingerRotation = this._currentFingerRotation;
-	
+
+				navigator.clipboard.writeText( state );
+
+			};
+
+			this.pasteState = () => {
+
+				const self = this;
+				navigator.clipboard.readText().then( function resolved( value ) {
+
+					self.setStateFromJSON( value );
+
+				} );
+
+			};
+
+			this.saveState = () => {
+
+				this._cameraMatrixState0.copy( this.camera.matrix );
+
+				this._gizmoMatrixState0.copy( this._gizmos.matrix );
+
+				this._nearPos = this.camera.near;
+				this._farPos = this.camera.far;
+				this._zoom0 = this.camera.zoom;
+
+				this._up0.copy( this.camera.up );
+
+				if ( this.camera.isPerspectiveCamera ) {
+
+					this._fov0 = this.camera.fov;
+
+				}
+
+			};
+
+			this.scale = ( size, point, scaleGizmos = true ) => {
+
+				const scalePoint = point.clone();
+				let sizeInverse = 1 / size;
+
+				if ( this.camera.isOrthographicCamera ) {
+
+					//camera zoom
+					this.camera.zoom = this._zoomState;
+					this.camera.zoom *= size; //check min and max zoom
+
+					if ( this.camera.zoom > this.maxZoom ) {
+
+						this.camera.zoom = this.maxZoom;
+						sizeInverse = this._zoomState / this.maxZoom;
+
+					} else if ( this.camera.zoom < this.minZoom ) {
+
+						this.camera.zoom = this.minZoom;
+						sizeInverse = this._zoomState / this.minZoom;
+
+					}
+
+					this.camera.updateProjectionMatrix();
+
+					this._v3_1.setFromMatrixPosition( this._gizmoMatrixState ); //gizmos position
+					//scale gizmos so they appear in the same spot having the same dimension
+
+
+					this._scaleMatrix.makeScale( sizeInverse, sizeInverse, sizeInverse );
+
+					this._translationMatrix.makeTranslation( - this._v3_1.x, - this._v3_1.y, - this._v3_1.z );
+
+					this._m4_2.makeTranslation( this._v3_1.x, this._v3_1.y, this._v3_1.z ).multiply( this._scaleMatrix );
+
+					this._m4_2.multiply( this._translationMatrix ); //move camera and gizmos to obtain pinch effect
+
+
+					scalePoint.sub( this._v3_1 );
+					const amount = scalePoint.clone().multiplyScalar( sizeInverse );
+					scalePoint.sub( amount );
+
+					this._m4_1.makeTranslation( scalePoint.x, scalePoint.y, scalePoint.z );
+
+					this._m4_2.premultiply( this._m4_1 );
+
+					this.setTransformationMatrices( this._m4_1, this._m4_2 );
+					return _transformation;
+
+				} else if ( this.camera.isPerspectiveCamera ) {
+
+					this._v3_1.setFromMatrixPosition( this._cameraMatrixState );
+
+					this._v3_2.setFromMatrixPosition( this._gizmoMatrixState ); //move camera
+
+
+					let distance = this._v3_1.distanceTo( scalePoint );
+
+					let amount = distance - distance * sizeInverse; //check min and max distance
+
+					const newDistance = distance - amount;
+
+					if ( newDistance < this.minDistance ) {
+
+						sizeInverse = this.minDistance / distance;
+						amount = distance - distance * sizeInverse;
+
+					} else if ( newDistance > this.maxDistance ) {
+
+						sizeInverse = this.maxDistance / distance;
+						amount = distance - distance * sizeInverse;
+
+					}
+
+					let direction = scalePoint.clone().sub( this._v3_1 ).normalize().multiplyScalar( amount );
+
+					this._m4_1.makeTranslation( direction.x, direction.y, direction.z );
+
+					if ( scaleGizmos ) {
+
+						//scale gizmos so they appear in the same spot having the same dimension
+						const pos = this._v3_2;
+						distance = pos.distanceTo( scalePoint );
+						amount = distance - distance * sizeInverse;
+						direction = scalePoint.clone().sub( this._v3_2 ).normalize().multiplyScalar( amount );
+
+						this._translationMatrix.makeTranslation( pos.x, pos.y, pos.z );
+
+						this._scaleMatrix.makeScale( sizeInverse, sizeInverse, sizeInverse );
+
+						this._m4_2.makeTranslation( direction.x, direction.y, direction.z ).multiply( this._translationMatrix );
+
+						this._m4_2.multiply( this._scaleMatrix );
+
+						this._translationMatrix.makeTranslation( - pos.x, - pos.y, - pos.z );
+
+						this._m4_2.multiply( this._translationMatrix );
+
+						this.setTransformationMatrices( this._m4_1, this._m4_2 );
+
+					} else {
+
+						this.setTransformationMatrices( this._m4_1 );
+
+					}
+
+					return _transformation;
+
 				}
-		
-				//this._currentFingerRotation = event.rotation;
-				this._currentFingerRotation = this.getAngle( this._touchCurrent[ 1 ], this._touchCurrent[ 0 ] ) + this.getAngle( this._touchStart[ 1 ], this._touchStart[ 0 ] );
-	
-				if ( !this.enablePan ) {
-	
-					rotationPoint = new THREE.Vector3().setFromMatrixPosition( this._gizmoMatrixState );
-	
-				} else {
-	
-					this._v3_2.setFromMatrixPosition( this._gizmoMatrixState );
-					rotationPoint = this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement ).applyQuaternion( this.camera.quaternion ).multiplyScalar( 1 / this.camera.zoom ).add( this._v3_2 );
-	
+
+			};
+
+			this.setFov = value => {
+
+				if ( this.camera.isPerspectiveCamera ) {
+
+					this.camera.fov = THREE.MathUtils.clamp( value, this.minFov, this.maxFov );
+					this.camera.updateProjectionMatrix();
+
 				}
-	
-				const amount = THREE.MathUtils.DEG2RAD * ( this._startFingerRotation - this._currentFingerRotation );
-	
-				this.applyTransformMatrix( this.zRotate( rotationPoint, amount ) );
-				this.dispatchEvent( _changeEvent );
-	
-			}
-	
-		};
-	
-		onRotateEnd = () => {
-	
-			this.updateTbState( STATE.IDLE, false );
-			this.activateGizmos( false );
-			this.dispatchEvent( _endEvent );
-	
-		};
-	
-		onPinchStart = ( event ) => {
-	
-			if ( this.enabled && this.enableZoom ) {
-	
-				this.dispatchEvent( _startEvent );
-				this.updateTbState( STATE.SCALE, true );
-		
-				this._startFingerDistance = this.calculatePointersDistance( this._touchCurrent[ 0 ], this._touchCurrent[ 1 ] );
-				this._currentFingerDistance =  this._startFingerDistance;
-	
-				this.activateGizmos( false );
-	
-			}
-	
-		};
-	
-		onPinchMove = ( event ) => {
-	
-			if ( this.enabled && this.enableZoom ) {
-	
-				this.setCenter( ( this._touchCurrent[ 0 ].clientX + this._touchCurrent[ 1 ].clientX ) / 2, ( this._touchCurrent[ 0 ].clientY + this._touchCurrent[ 1 ].clientY ) / 2 );
-				const minDistance = 12; //minimum distance between fingers (in css pixels)
-		
-				if ( this._state != STATE.SCALE ) {
-	
-					this._startFingerDistance = this._currentFingerDistance;
-					this.updateTbState( STATE.SCALE, true );
-	
+
+			};
+
+			this.setTarget = ( x, y, z ) => {
+
+				this._tbCenter.set( x, y, z );
+
+				this._gizmos.position.set( x, y, z ); //for correct radius calculation
+
+
+				this._tbRadius = this.calculateTbRadius( this.camera );
+				this.makeGizmos( this._tbCenter, this._tbRadius );
+				this.camera.lookAt( this._tbCenter );
+
+			};
+
+			this.zRotate = ( point, angle ) => {
+
+				this._rotationMatrix.makeRotationAxis( this._rotationAxis, angle );
+
+				this._translationMatrix.makeTranslation( - point.x, - point.y, - point.z );
+
+				this._m4_1.makeTranslation( point.x, point.y, point.z );
+
+				this._m4_1.multiply( this._rotationMatrix );
+
+				this._m4_1.multiply( this._translationMatrix );
+
+				this._v3_1.setFromMatrixPosition( this._gizmoMatrixState ).sub( point ); //vector from rotation center to gizmos position
+
+
+				this._v3_2.copy( this._v3_1 ).applyAxisAngle( this._rotationAxis, angle ); //apply rotation
+
+
+				this._v3_2.sub( this._v3_1 );
+
+				this._m4_2.makeTranslation( this._v3_2.x, this._v3_2.y, this._v3_2.z );
+
+				this.setTransformationMatrices( this._m4_1, this._m4_2 );
+				return _transformation;
+
+			};
+
+			this.unprojectOnObj = ( cursor, camera ) => {
+
+				const raycaster = new THREE.Raycaster();
+				raycaster.near = camera.near;
+				raycaster.far = camera.far;
+				raycaster.setFromCamera( cursor, camera );
+				const intersect = raycaster.intersectObjects( this.scene.children, true );
+
+				for ( let i = 0; i < intersect.length; i ++ ) {
+
+					if ( intersect[ i ].object.uuid != this._gizmos.uuid && intersect[ i ].face != null ) {
+
+						return intersect[ i ].point.clone();
+
+					}
+
 				}
-		
-				this._currentFingerDistance = Math.max( this.calculatePointersDistance( this._touchCurrent[ 0 ], this._touchCurrent[ 1 ] ), minDistance * this._devPxRatio );
-				const amount = this._currentFingerDistance / this._startFingerDistance;
-		
-				let scalePoint;
-	
-				if ( !this.enablePan ) {
-	
-					scalePoint = this._gizmos.position;
-	
-				} else {
-	
-					if ( this.camera.isOrthographicCamera ) {
-	
-						scalePoint = this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement )
-							.applyQuaternion( this.camera.quaternion )
-							.multiplyScalar( 1 / this.camera.zoom )
-							.add( this._gizmos.position );
-	
+
+				return null;
+
+			};
+
+			this.unprojectOnTbSurface = ( camera, cursorX, cursorY, canvas, tbRadius ) => {
+
+				if ( camera.type == 'OrthographicCamera' ) {
+
+					this._v2_1.copy( this.getCursorPosition( cursorX, cursorY, canvas ) );
+
+					this._v3_1.set( this._v2_1.x, this._v2_1.y, 0 );
+
+					const x2 = Math.pow( this._v2_1.x, 2 );
+					const y2 = Math.pow( this._v2_1.y, 2 );
+					const r2 = Math.pow( this._tbRadius, 2 );
+
+					if ( x2 + y2 <= r2 * 0.5 ) {
+
+						//intersection with sphere
+						this._v3_1.setZ( Math.sqrt( r2 - ( x2 + y2 ) ) );
+
+					} else {
+
+						//intersection with hyperboloid
+						this._v3_1.setZ( r2 * 0.5 / Math.sqrt( x2 + y2 ) );
+
 					}
-					else if ( this.camera.isPerspectiveCamera ) {
-	
-						scalePoint = this.unprojectOnTbPlane( this.camera, _center.x, _center.y, this.domElement )
-							.applyQuaternion( this.camera.quaternion )
-							.add( this._gizmos.position );
-						
+
+					return this._v3_1;
+
+				} else if ( camera.type == 'PerspectiveCamera' ) {
+
+					//unproject cursor on the near plane
+					this._v2_1.copy( this.getCursorNDC( cursorX, cursorY, canvas ) );
+
+					this._v3_1.set( this._v2_1.x, this._v2_1.y, - 1 );
+
+					this._v3_1.applyMatrix4( camera.projectionMatrixInverse );
+
+					const rayDir = this._v3_1.clone().normalize(); //unprojected ray direction
+
+
+					const cameraGizmoDistance = camera.position.distanceTo( this._gizmos.position );
+					const radius2 = Math.pow( tbRadius, 2 ); //	  camera
+					//		|\
+					//		| \
+					//		|  \
+					//	h	|	\
+					//		| 	 \
+					//		| 	  \
+					//	_ _ | _ _ _\ _ _  near plane
+					//			l
+
+					const h = this._v3_1.z;
+					const l = Math.sqrt( Math.pow( this._v3_1.x, 2 ) + Math.pow( this._v3_1.y, 2 ) );
+
+					if ( l == 0 ) {
+
+						//ray aligned with camera
+						rayDir.set( this._v3_1.x, this._v3_1.y, tbRadius );
+						return rayDir;
+
 					}
-	
-				}
-		
-				this.applyTransformMatrix( this.scale( amount, scalePoint ) );
-				this.dispatchEvent( _changeEvent );
-			}
-		};
-	
-		onPinchEnd = () => {
-	
-			this.updateTbState( STATE.IDLE, false );
-			this.dispatchEvent( _endEvent );
-	
-		};
-	
-		onTriplePanStart = ( event ) => {
-	
-			if ( this.enabled && this.enableZoom ) {
-	
-				this.dispatchEvent( _startEvent );
-	
-				this.updateTbState( STATE.SCALE, true );
-		
-				//const center = event.center;
-				let clientX = 0;
-				let clientY = 0;
-				const nFingers = this._touchCurrent.length;
-	
-				for ( let i = 0; i < nFingers; i++ ) {
-	
-					clientX += this._touchCurrent[ i ].clientX;
-					clientY += this._touchCurrent[ i ].clientY;
-	
+
+					const m = h / l;
+					const q = cameraGizmoDistance;
+					/*
+         * calculate intersection point between unprojected ray and trackball surface
+         *|y = m * x + q
+         *|x^2 + y^2 = r^2
+         *
+         * (m^2 + 1) * x^2 + (2 * m * q) * x + q^2 - r^2 = 0
+         */
+
+					let a = Math.pow( m, 2 ) + 1;
+					let b = 2 * m * q;
+					let c = Math.pow( q, 2 ) - radius2;
+					let delta = Math.pow( b, 2 ) - 4 * a * c;
+
+					if ( delta >= 0 ) {
+
+						//intersection with sphere
+						this._v2_1.setX( ( - b - Math.sqrt( delta ) ) / ( 2 * a ) );
+
+						this._v2_1.setY( m * this._v2_1.x + q );
+
+						const angle = THREE.MathUtils.RAD2DEG * this._v2_1.angle();
+
+						if ( angle >= 45 ) {
+
+							//if angle between intersection point and X' axis is >= 45°, return that point
+							//otherwise, calculate intersection point with hyperboloid
+							const rayLength = Math.sqrt( Math.pow( this._v2_1.x, 2 ) + Math.pow( cameraGizmoDistance - this._v2_1.y, 2 ) );
+							rayDir.multiplyScalar( rayLength );
+							rayDir.z += cameraGizmoDistance;
+							return rayDir;
+
+						}
+
+					} //intersection with hyperboloid
+
+					/*
+         *|y = m * x + q
+         *|y = (1 / x) * (r^2 / 2)
+         *
+         * m * x^2 + q * x - r^2 / 2 = 0
+         */
+
+
+					a = m;
+					b = q;
+					c = - radius2 * 0.5;
+					delta = Math.pow( b, 2 ) - 4 * a * c;
+
+					this._v2_1.setX( ( - b - Math.sqrt( delta ) ) / ( 2 * a ) );
+
+					this._v2_1.setY( m * this._v2_1.x + q );
+
+					const rayLength = Math.sqrt( Math.pow( this._v2_1.x, 2 ) + Math.pow( cameraGizmoDistance - this._v2_1.y, 2 ) );
+					rayDir.multiplyScalar( rayLength );
+					rayDir.z += cameraGizmoDistance;
+					return rayDir;
+
 				}
-	
-				this.setCenter( clientX / nFingers, clientY / nFingers );
-	
-				this._startCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
-				this._currentCursorPosition.copy( this._startCursorPosition );
-	
-			}
-	
-		};
-	
-		onTriplePanMove = ( event ) => {
-	
-			if ( this.enabled && this.enableZoom ) {
-	
-					//	  fov / 2
+
+			};
+
+			this.unprojectOnTbPlane = ( camera, cursorX, cursorY, canvas, initialDistance = false ) => {
+
+				if ( camera.type == 'OrthographicCamera' ) {
+
+					this._v2_1.copy( this.getCursorPosition( cursorX, cursorY, canvas ) );
+
+					this._v3_1.set( this._v2_1.x, this._v2_1.y, 0 );
+
+					return this._v3_1.clone();
+
+				} else if ( camera.type == 'PerspectiveCamera' ) {
+
+					this._v2_1.copy( this.getCursorNDC( cursorX, cursorY, canvas ) ); //unproject cursor on the near plane
+
+
+					this._v3_1.set( this._v2_1.x, this._v2_1.y, - 1 );
+
+					this._v3_1.applyMatrix4( camera.projectionMatrixInverse );
+
+					const rayDir = this._v3_1.clone().normalize(); //unprojected ray direction
+					//	  camera
 					//		|\
 					//		| \
 					//		|  \
-					//	x	|	\
+					//	h	|	\
 					//		| 	 \
 					//		| 	  \
-					//		| _ _ _\
-					//			y
-	
-				//const center = event.center;
-				let clientX = 0;
-				let clientY = 0;
-				const nFingers = this._touchCurrent.length;
-	
-				for ( let i = 0; i < nFingers; i++ ) {
-	
-					clientX += this._touchCurrent[ i ].clientX;
-					clientY += this._touchCurrent[ i ].clientY;
-	
-				}
-				
-				this.setCenter( clientX / nFingers, clientY / nFingers );
-	
-				const screenNotches = 8;	//how many wheel notches corresponds to a full screen pan
-				this._currentCursorPosition.setY( this.getCursorNDC( _center.x, _center.y, this.domElement ).y * 0.5 );
-	
-				let movement = this._currentCursorPosition.y - this._startCursorPosition.y;
-	
-				let size = 1 ;
-	
-				if ( movement < 0 ) {
-	
-					size = 1 / ( Math.pow( this.scaleFactor, -movement * screenNotches ) );
-	
-				} else if ( movement > 0 ) {
-	
-					size = Math.pow( this.scaleFactor, movement * screenNotches );
-	
-				}
-	
-				this._v3_1.setFromMatrixPosition( this._cameraMatrixState );
-				const x = this._v3_1.distanceTo( this._gizmos.position );
-				let xNew = x / size; //distance between camera and gizmos if scale(size, scalepoint) would be performed
-				
-				//check min and max distance
-				xNew = THREE.MathUtils.clamp( xNew, this.minDistance, this.maxDistance );
-	
-				const y = x * Math.tan( THREE.MathUtils.DEG2RAD * this._fovState * 0.5 );
-	
-				//calculate new fov
-				let newFov = THREE.MathUtils.RAD2DEG * ( Math.atan( y / xNew ) * 2 );
-				
-				//check min and max fov
-				newFov = THREE.MathUtils.clamp( newFov, this.minFov, this.maxFov );
-	
-				const newDistance = y / Math.tan( THREE.MathUtils.DEG2RAD * ( newFov / 2 ) );
-				size = x / newDistance;
-				this._v3_2.setFromMatrixPosition( this._gizmoMatrixState );
-	
-				this.setFov( newFov );
-				this.applyTransformMatrix( this.scale( size, this._v3_2, false ) );
-	
-				//adjusting distance
-				let direction = this._gizmos.position.clone().sub(this.camera.position).normalize().multiplyScalar( newDistance / x );
-				this._m4_1.makeTranslation( direction.x, direction.y, direction.z );
-				
-				this.dispatchEvent( _changeEvent );
-	
-			}
-		
-		};
-	
-		onTriplePanEnd = ( event ) => {
-	
-			this.updateTbState( STATE.IDLE, false );
-			this.dispatchEvent( _endEvent );
-			//this.dispatchEvent( _changeEvent );
-	
-		};
-	
-		/**
-		 * Set _center's x/y coordinates
-		 * @param {Number} clientX 
-		 * @param {Number} clientY 
-		 */
-		setCenter = ( clientX, clientY ) => {
-
-			_center.x = clientX;
-			_center.y = clientY;
-
-		};
-
-			/**
-		 * Set default mouse actions
-		 */
-		initializeMouseActions = () => {
-
-			this.setMouseAction( 'PAN', 0, 'CTRL' );
-			this.setMouseAction( 'PAN', 2 );
-	
-			this.setMouseAction( 'ROTATE', 0 );
-	
-			this.setMouseAction( 'ZOOM', 'WHEEL' );
-			this.setMouseAction( 'ZOOM', 1 );
-	
-			this.setMouseAction( 'FOV', 'WHEEL', 'SHIFT' );
-			this.setMouseAction( 'FOV', 1, 'SHIFT' );
-
-		};
+					//	_ _ | _ _ _\ _ _  near plane
+					//			l
 
-		/**
-		 * Compare two mouse actions
-		 * @param {Object} action1 
-		 * @param {Object} action2 
-		 * @returns {Boolean} True if action1 and action 2 are the same mouse action, false otherwise
-		 */
-		compareMouseAction = ( action1, action2 ) => {
 
-			if ( action1.operation == action2.operation ) {
+					const h = this._v3_1.z;
+					const l = Math.sqrt( Math.pow( this._v3_1.x, 2 ) + Math.pow( this._v3_1.y, 2 ) );
+					let cameraGizmoDistance;
 
-				if ( action1.mouse == action2.mouse && action1.key == action2.key ) {
+					if ( initialDistance ) {
 
-					return true;
+						cameraGizmoDistance = this._v3_1.setFromMatrixPosition( this._cameraMatrixState0 ).distanceTo( this._v3_2.setFromMatrixPosition( this._gizmoMatrixState0 ) );
 
-				} else {
+					} else {
 
-					return false;
+						cameraGizmoDistance = camera.position.distanceTo( this._gizmos.position );
+
+					}
+					/*
+         * calculate intersection point between unprojected ray and the plane
+         *|y = mx + q
+         *|y = 0
+         *
+         * x = -q/m
+        */
+
+
+					if ( l == 0 ) {
+
+						//ray aligned with camera
+						rayDir.set( 0, 0, 0 );
+						return rayDir;
+
+					}
+
+					const m = h / l;
+					const q = cameraGizmoDistance;
+					const x = - q / m;
+					const rayLength = Math.sqrt( Math.pow( q, 2 ) + Math.pow( x, 2 ) );
+					rayDir.multiplyScalar( rayLength );
+					rayDir.z = 0;
+					return rayDir;
 
 				}
 
-			} else {
+			};
 
-				return false;
+			this.updateMatrixState = () => {
 
-			}
+				//update camera and gizmos state
+				this._cameraMatrixState.copy( this.camera.matrix );
 
-		};
+				this._gizmoMatrixState.copy( this._gizmos.matrix );
 
-		/**
-		 * Set a new mouse action by specifying the operation to be performed and a mouse/key combination. In case of conflict, replaces the existing one
-		 * @param {String} operation The operation to be performed ('PAN', 'ROTATE', 'ZOOM', 'FOV)
-		 * @param {*} mouse A mouse button (0, 1, 2) or 'WHEEL' for wheel notches
-		 * @param {*} key The keyboard modifier ('CTRL', 'SHIFT') or null if key is not needed
-		 * @returns {Boolean} True if the mouse action has been successfully added, false otherwise
-		 */
-		setMouseAction = ( operation, mouse, key = null ) => {
-
-			const operationInput = [ 'PAN', 'ROTATE', 'ZOOM', 'FOV' ];
-			const mouseInput = [ 0, 1, 2, 'WHEEL' ];
-			const keyInput = [ 'CTRL', 'SHIFT', null ];
-			let state;
-
-			if ( !operationInput.includes( operation ) || !mouseInput.includes( mouse ) || !keyInput.includes( key ) ) {
-
-				//invalid parameters
-				return false;
+				if ( this.camera.isOrthographicCamera ) {
 
-			}
+					this._cameraProjectionState.copy( this.camera.projectionMatrix );
 
-			if ( mouse == 'WHEEL' ) {
+					this.camera.updateProjectionMatrix();
+					this._zoomState = this.camera.zoom;
 
-				if ( operation != 'ZOOM' && operation != 'FOV' ) {
+				} else if ( this.camera.isPerspectiveCamera ) {
 
-					//cannot associate 2D operation to 1D input
-					return false
+					this._fovState = this.camera.fov;
 
 				}
 
-			}
+			};
 
-			switch ( operation ) {
+			this.updateTbState = ( newState, updateMatrices ) => {
 
-				case 'PAN':
+				this._state = newState;
 
-					state = STATE.PAN;
-					break;
-			
-				case 'ROTATE':
+				if ( updateMatrices ) {
 
-					state = STATE.ROTATE;
-					break;
+					this.updateMatrixState();
 
-				case 'ZOOM':
+				}
 
-					state = STATE.SCALE;
-					break;
-			
-				case 'FOV':
+			};
 
-					state = STATE.FOV;
-					break;
+			this.update = () => {
 
-			}
+				const EPS = 0.000001; //check min/max parameters
+
+				if ( this.camera.isOrthographicCamera ) {
+
+					//check zoom
+					if ( this.camera.zoom > this.maxZoom || this.camera.zoom < this.minZoom ) {
+
+						const newZoom = THREE.MathUtils.clamp( this.camera.zoom, this.minZoom, this.maxZoom );
+						this.applyTransformMatrix( this.scale( newZoom / this.camera.zoom, this._gizmos.position, true ) );
+
+					}
+
+				} else if ( this.camera.isPerspectiveCamera ) {
+
+					//check distance
+					const distance = this.camera.position.distanceTo( this._gizmos.position );
+
+					if ( distance > this.maxDistance + EPS || distance < this.minDistance - EPS ) {
+
+						const newDistance = THREE.MathUtils.clamp( distance, this.minDistance, this.maxDistance );
+						this.applyTransformMatrix( this.scale( newDistance / distance, this._gizmos.position ) );
+						this.updateMatrixState();
+
+					} //check fov
+
+
+					if ( this.camera.fov < this.minFov || this.camera.fov > this.maxFov ) {
+
+						this.camera.fov = THREE.MathUtils.clamp( this.camera.fov, this.minFov, this.maxFov );
+						this.camera.updateProjectionMatrix();
+
+					}
+
+					const oldRadius = this._tbRadius;
+					this._tbRadius = this.calculateTbRadius( this.camera );
 
-			const action = {
+					if ( oldRadius < this._tbRadius - EPS || oldRadius > this._tbRadius + EPS ) {
 
-				operation: operation,
-				mouse: mouse,
-				key: key,
-				state: state
+						const scale = ( this._gizmos.scale.x + this._gizmos.scale.y + this._gizmos.scale.z ) / 3;
+						const newRadius = this._tbRadius / scale;
+						const curve = new THREE.EllipseCurve( 0, 0, newRadius, newRadius );
+						const points = curve.getPoints( this._curvePts );
+						const curveGeometry = new THREE.BufferGeometry().setFromPoints( points );
+
+						for ( const gizmo in this._gizmos.children ) {
+
+							this._gizmos.children[ gizmo ].geometry = curveGeometry;
+
+						}
+
+					}
+
+				}
+
+				this.camera.lookAt( this._gizmos.position );
 
 			};
 
-			for( let i = 0; i < this.mouseActions.length; i++ ) {
+			this.setStateFromJSON = json => {
+
+				const state = JSON.parse( json );
+
+				if ( state.arcballState != undefined ) {
+
+					this._cameraMatrixState.fromArray( state.arcballState.cameraMatrix.elements );
+
+					this._cameraMatrixState.decompose( this.camera.position, this.camera.quaternion, this.camera.scale );
+
+					this.camera.up.copy( state.arcballState.cameraUp );
+					this.camera.near = state.arcballState.cameraNear;
+					this.camera.far = state.arcballState.cameraFar;
+					this.camera.zoom = state.arcballState.cameraZoom;
+
+					if ( this.camera.isPerspectiveCamera ) {
 
-				if ( this.mouseActions[ i ].mouse == action.mouse && this.mouseActions[ i ].key == action.key ) {
+						this.camera.fov = state.arcballState.cameraFov;
 
-					this.mouseActions.splice( i, 1, action );
-					return true;
+					}
+
+					this._gizmoMatrixState.fromArray( state.arcballState.gizmoMatrix.elements );
+
+					this._gizmoMatrixState.decompose( this._gizmos.position, this._gizmos.quaternion, this._gizmos.scale );
+
+					this.camera.updateMatrix();
+					this.camera.updateProjectionMatrix();
+
+					this._gizmos.updateMatrix();
+
+					this._tbRadius = this.calculateTbRadius( this.camera );
+					const gizmoTmp = new THREE.Matrix4().copy( this._gizmoMatrixState0 );
+					this.makeGizmos( this._gizmos.position, this._tbRadius );
+
+					this._gizmoMatrixState0.copy( gizmoTmp );
+
+					this.camera.lookAt( this._gizmos.position );
+					this.updateTbState( STATE.IDLE, false );
+					this.dispatchEvent( _changeEvent );
 
 				}
 
-			}
+			};
+
+			this.camera = null;
+			this.domElement = domElement;
+			this.scene = scene;
+			this.mouseActions = [];
+			this._mouseOp = null; //global vectors and matrices that are used in some operations to avoid creating new objects every time (e.g. every time cursor moves)
+
+			this._v2_1 = new THREE.Vector2();
+			this._v3_1 = new THREE.Vector3();
+			this._v3_2 = new THREE.Vector3();
+			this._m4_1 = new THREE.Matrix4();
+			this._m4_2 = new THREE.Matrix4();
+			this._quat = new THREE.Quaternion(); //transformation matrices
 
-			this.mouseActions.push( action );
-			return true;
+			this._translationMatrix = new THREE.Matrix4(); //matrix for translation operation
 
-		};
+			this._rotationMatrix = new THREE.Matrix4(); //matrix for rotation operation
 
-		/**
-		 * Remove a mouse action by specifying its mouse/key combination
-		 * @param {*} mouse A mouse button (0, 1, 2) or 'WHEEL' for wheel notches
-		 * @param {*} key The keyboard modifier ('CTRL', 'SHIFT') or null if key is not needed
-		 * @returns {Boolean} True if the operation has been succesfully removed, false otherwise
-		 */
-		unsetMouseAction = ( mouse, key = null ) => {
+			this._scaleMatrix = new THREE.Matrix4(); //matrix for scaling operation
+
+			this._rotationAxis = new THREE.Vector3(); //axis for rotate operation
+			//camera state
+
+			this._cameraMatrixState = new THREE.Matrix4();
+			this._cameraProjectionState = new THREE.Matrix4();
+			this._fovState = 1;
+			this._upState = new THREE.Vector3();
+			this._zoomState = 1;
+			this._nearPos = 0;
+			this._farPos = 0;
+			this._gizmoMatrixState = new THREE.Matrix4(); //initial values
+
+			this._up0 = new THREE.Vector3();
+			this._zoom0 = 1;
+			this._fov0 = 0;
+			this._initialNear = 0;
+			this._nearPos0 = 0;
+			this._initialFar = 0;
+			this._farPos0 = 0;
+			this._cameraMatrixState0 = new THREE.Matrix4();
+			this._gizmoMatrixState0 = new THREE.Matrix4(); //pointers array
+
+			this._button = - 1;
+			this._touchStart = [];
+			this._touchCurrent = [];
+			this._input = INPUT.NONE; //two fingers touch interaction
 
-			for( let i = 0; i < this.mouseActions.length; i++ ) {
+			this._switchSensibility = 32; //minimum movement to be performed to fire single pan start after the second finger has been released
 
-				if ( this.mouseActions[ i ].mouse == mouse && this.mouseActions[ i ].key == key ) {
+			this._startFingerDistance = 0; //distance between two fingers
 
-					this.mouseActions.splice( i, 1 );
-					return true;
+			this._currentFingerDistance = 0;
+			this._startFingerRotation = 0; //amount of rotation performed with two fingers
 
-				}
+			this._currentFingerRotation = 0; //double tap
 
-			}
+			this._devPxRatio = 0;
+			this._downValid = true;
+			this._nclicks = 0;
+			this._downEvents = [];
+			this._downStart = 0; //pointerDown time
 
-			return false;
+			this._clickStart = 0; //first click time
 
-		};
+			this._maxDownTime = 250;
+			this._maxInterval = 300;
+			this._posThreshold = 24;
+			this._movementThreshold = 24; //cursor positions
 
-		/**
-		 * Return the operation associated to a mouse/keyboard combination
-		 * @param {*} mouse A mouse button (0, 1, 2) or 'WHEEL' for wheel notches
-		 * @param {*} key The keyboard modifier ('CTRL', 'SHIFT') or null if key is not needed
-		 * @returns The operation if it has been found, null otherwise
-		 */
-		getOpFromAction = ( mouse, key ) => {
+			this._currentCursorPosition = new THREE.Vector3();
+			this._startCursorPosition = new THREE.Vector3(); //grid
 
-			let action;
+			this._grid = null; //grid to be visualized during pan operation
 
-			for( let i = 0; i < this.mouseActions.length; i++ ) {
+			this._gridPosition = new THREE.Vector3(); //gizmos
 
-				action = this.mouseActions[ i ];
-				if( action.mouse == mouse && action.key == key ) {
+			this._gizmos = new THREE.Group();
+			this._curvePts = 128; //animations
 
-					return action.operation;
+			this._timeStart = - 1; //initial time
 
-				}
+			this._animationId = - 1; //focus animation
 
-			}
+			this.focusAnimationTime = 500; //duration of focus animation in ms
+			//rotate animation
 
-			if ( key != null ) {
+			this._timePrev = 0; //time at which previous rotate operation has been detected
 
-				for( let i = 0; i < this.mouseActions.length; i++ ) {
+			this._timeCurrent = 0; //time at which current rotate operation has been detected
 
-					action = this.mouseActions[ i ];
-					if ( action.mouse == mouse && action.key == null ) {
-					
-						return action.operation;
-					
-					}
-				
-				}
+			this._anglePrev = 0; //angle of previous rotation
 
-			}
+			this._angleCurrent = 0; //angle of current rotation
 
-			return null;
+			this._cursorPosPrev = new THREE.Vector3(); //cursor position when previous rotate operation has been detected
 
-		};
+			this._cursorPosCurr = new THREE.Vector3(); //cursor position when current rotate operation has been detected
 
-		/**
-		 * Get the operation associated to mouse and key combination and returns the corresponding FSA state
-		 * @param {Number} mouse Mouse button 
-		 * @param {String} key Keyboard modifier
-		 * @returns The FSA state obtained from the operation associated to mouse/keyboard combination
-		 */
-		getOpStateFromAction = ( mouse, key ) => {
+			this._wPrev = 0; //angular velocity of the previous rotate operation
 
-			let action;
+			this._wCurr = 0; //angular velocity of the current rotate operation
+			//parameters
 
-			for( let i = 0; i < this.mouseActions.length; i++ ) {
+			this.adjustNearFar = false;
+			this.scaleFactor = 1.1; //zoom/distance multiplier
 
-				action = this.mouseActions[ i ];
-				if( action.mouse == mouse && action.key == key ) {
+			this.dampingFactor = 25;
+			this.wMax = 20; //maximum angular velocity allowed
 
-					return action.state;
+			this.enableAnimations = true; //if animations should be performed
 
-				}
+			this.enableGrid = false; //if grid should be showed during pan operation
 
-			}
+			this.cursorZoom = false; //if wheel zoom should be cursor centered
 
-			if ( key != null ) {
+			this.minFov = 5;
+			this.maxFov = 90;
+			this.enabled = true;
+			this.enablePan = true;
+			this.enableRotate = true;
+			this.enableZoom = true;
+			this.enableGizmos = true;
+			this.minDistance = 0;
+			this.maxDistance = Infinity;
+			this.minZoom = 0;
+			this.maxZoom = Infinity; //trackball parameters
 
-				for( let i = 0; i < this.mouseActions.length; i++ ) {
+			this._tbCenter = new THREE.Vector3( 0, 0, 0 );
+			this._tbRadius = 1; //FSA
 
-					action = this.mouseActions[ i ];
-					if ( action.mouse == mouse && action.key == null ) {
-					
-						return action.state;
-					
-					}
-				
-				}
+			this._state = STATE.IDLE;
+			this.setCamera( _camera );
 
-			}
+			if ( this.scene != null ) {
 
-			return null;
+				this.scene.add( this._gizmos );
 
-		};
+			}
 
-		/**
-		 * Calculate the angle between two pointers
-		 * @param {PointerEvent} p1 
-		 * @param {PointerEvent} p2
-		 * @returns {Number} The angle between two pointers in degrees
-		 */
-		getAngle = ( p1, p2  ) => {
+			this.domElement.style.touchAction = 'none';
+			this._devPxRatio = window.devicePixelRatio;
+			this.initializeMouseActions();
+			this.domElement.addEventListener( 'contextmenu', this.onContextMenu );
+			this.domElement.addEventListener( 'wheel', this.onWheel );
+			this.domElement.addEventListener( 'pointerdown', this.onPointerDown );
+			this.domElement.addEventListener( 'pointercancel', this.onPointerCancel );
+			window.addEventListener( 'keydown', this.onKeyDown );
+			window.addEventListener( 'resize', this.onWindowResize );
 
-			return Math.atan2( p2.clientY - p1.clientY, p2.clientX - p1.clientX ) * 180 / Math.PI;
+		} //listeners
 
-		};
 
 		/**
-	 	* Update a PointerEvent inside current pointerevents array
-	 	* @param {PointerEvent} event
-	 	*/
-		updateTouchEvent = ( event ) => {
-
-			for ( let i = 0; i < this._touchCurrent.length; i++ ) {
-	
-				if ( this._touchCurrent[ i ].pointerId == event.pointerId ) {
-	
-					this._touchCurrent.splice( i, 1, event )
-					break;
-	
-				}
-	
-			}
-	
-		};
-	
-		/**
-		 * Apply a transformation matrix, to the camera and gizmos
-		 * @param {Object} transformation Object containing matrices to apply to camera and gizmos
-		 */
+   * Apply a transformation matrix, to the camera and gizmos
+   * @param {Object} transformation Object containing matrices to apply to camera and gizmos
+   */
 		applyTransformMatrix( transformation ) {
-	
+
 			if ( transformation.camera != null ) {
-	
+
 				this._m4_1.copy( this._cameraMatrixState ).premultiply( transformation.camera );
+
 				this._m4_1.decompose( this.camera.position, this.camera.quaternion, this.camera.scale );
-				this.camera.updateMatrix();
-	
-				//update camera up vector
+
+				this.camera.updateMatrix(); //update camera up vector
+
 				if ( this._state == STATE.ROTATE || this._state == STATE.ZROTATE || this._state == STATE.ANIMATION_ROTATE ) {
-	
+
 					this.camera.up.copy( this._upState ).applyQuaternion( this.camera.quaternion );
-	
+
 				}
-	
+
 			}
-	
+
 			if ( transformation.gizmos != null ) {
-	
+
 				this._m4_1.copy( this._gizmoMatrixState ).premultiply( transformation.gizmos );
+
 				this._m4_1.decompose( this._gizmos.position, this._gizmos.quaternion, this._gizmos.scale );
+
 				this._gizmos.updateMatrix();
-	
+
 			}
-	
-			if ( this._state == STATE.SCALE || this._state == STATE.FOCUS || this._state == STATE.ANIMATION_FOCUS) {
-	
-				this._tbRadius = this.calculateTbRadius(this.camera);
-	
+
+			if ( this._state == STATE.SCALE || this._state == STATE.FOCUS || this._state == STATE.ANIMATION_FOCUS ) {
+
+				this._tbRadius = this.calculateTbRadius( this.camera );
+
 				if ( this.adjustNearFar ) {
-	
+
 					const cameraDistance = this.camera.position.distanceTo( this._gizmos.position );
-					
 					const bb = new THREE.Box3();
 					bb.setFromObject( this._gizmos );
 					const sphere = new THREE.Sphere();
 					bb.getBoundingSphere( sphere );
-	
 					const adjustedNearPosition = Math.max( this._nearPos0, sphere.radius + sphere.center.length() );
 					const regularNearPosition = cameraDistance - this._initialNear;
-	
 					const minNearPos = Math.min( adjustedNearPosition, regularNearPosition );
 					this.camera.near = cameraDistance - minNearPos;
-	
-	
-					const adjustedFarPosition = Math.min( this._farPos0, -sphere.radius + sphere.center.length() );
+					const adjustedFarPosition = Math.min( this._farPos0, - sphere.radius + sphere.center.length() );
 					const regularFarPosition = cameraDistance - this._initialFar;
-	
 					const minFarPos = Math.min( adjustedFarPosition, regularFarPosition );
 					this.camera.far = cameraDistance - minFarPos;
-	
 					this.camera.updateProjectionMatrix();
-	
+
 				} else {
-	
+
 					let update = false;
-	
-					if (this.camera.near != this._initialNear ) {
-	
+
+					if ( this.camera.near != this._initialNear ) {
+
 						this.camera.near = this._initialNear;
 						update = true;
-	
+
 					}
-	
+
 					if ( this.camera.far != this._initialFar ) {
-	
+
 						this.camera.far = this._initialFar;
 						update = true;
-	
+
 					}
-	
+
 					if ( update ) {
-	
+
 						this.camera.updateProjectionMatrix();
-	
+
 					}
-	
-				}
-	
-			}
-	
-		};
-	
-		/**
-		 * Calculate the angular speed
-		 * @param {Number} p0 Position at t0 
-		 * @param {Number} p1 Position at t1
-		 * @param {Number} t0 Initial time in milliseconds
-		 * @param {Number} t1 Ending time in milliseconds
-		 */
-		calculateAngularSpeed = ( p0, p1, t0, t1 ) => {
-	
-			const s = p1 - p0;
-			const t = ( t1 - t0 ) / 1000;
-			if ( t == 0 ) {
-	
-				return 0;
-	
-			}
-	
-			return s / t;
-	
-		};
-	
-		/**
-		 * Calculate the distance between two pointers
-		 * @param {PointerEvent} p0 The first pointer
-		 * @param {PointerEvent} p1 The second pointer
-		 * @returns {number} The distance between the two pointers 
-		 */
-		calculatePointersDistance = ( p0, p1 ) => {
-	
-			return Math.sqrt( Math.pow( p1.clientX - p0.clientX, 2 ) + Math.pow( p1.clientY - p0.clientY, 2 ) );
-	
-		};
-	
-		/**
-		 * Calculate the rotation axis as the vector perpendicular between two vectors
-		 * @param {THREE.Vector3} vec1 The first vector
-		 * @param {THREE.Vector3} vec2 The second vector
-		 * @returns {THREE.Vector3} The normalized rotation axis
-		 */
-		calculateRotationAxis = ( vec1, vec2 ) => {
-	
-			this._rotationMatrix.extractRotation( this._cameraMatrixState );
-			this._quat.setFromRotationMatrix( this._rotationMatrix );
-	
-			this._rotationAxis.crossVectors( vec1, vec2 ).applyQuaternion( this._quat );
-			return this._rotationAxis.normalize().clone();
-	
-		};
-	
-		/**
-		 * Calculate the trackball radius so that gizmo's diamater will be 2/3 of the minimum side of the camera frustum
-		 * @param {Camera} camera 
-		 * @returns {Number} The trackball radius
-		 */
-		calculateTbRadius = ( camera ) => {
-	
-			const factor = 0.67;
-			const distance = camera.position.distanceTo( this._gizmos.position );
-	
-			if ( camera.type == 'PerspectiveCamera' ) {
-	
-				const halfFovV = THREE.MathUtils.DEG2RAD * camera.fov * 0.5;  //vertical fov/2 in radians
-				const halfFovH = Math.atan( ( camera.aspect ) * Math.tan( halfFovV ) ); //horizontal fov/2 in radians
-				return Math.tan( Math.min( halfFovV, halfFovH ) ) * distance * factor;
-	
-			} else if ( camera.type == 'OrthographicCamera' ) {
-	
-				return Math.min( camera.top, camera.right ) * factor;
-	
-			}
-	
-		};
-	
-		/**
-		 * Focus operation consist of positioning the point of interest in front of the camera and a slightly zoom in
-		 * @param {THREE.Vector3} point The point of interest 
-		 * @param {Number} size Scale factor
-		 * @param {Number} amount Amount of operation to be completed (used for focus animations, default is complete full operation)
-		 */
-		focus = ( point, size, amount = 1 ) => {
-	
-			const focusPoint = point.clone();
-	
-			//move center of camera (along with gizmos) towards point of interest
-			focusPoint.sub( this._gizmos.position ).multiplyScalar( amount );
-			this._translationMatrix.makeTranslation( focusPoint.x, focusPoint.y, focusPoint.z );
-	
-			const gizmoStateTemp = this._gizmoMatrixState.clone();
-			this._gizmoMatrixState.premultiply( this._translationMatrix );
-			this._gizmoMatrixState.decompose( this._gizmos.position, this._gizmos.quaternion, this._gizmos.scale )
-	
-			const cameraStateTemp = this._cameraMatrixState.clone();
-			this._cameraMatrixState.premultiply( this._translationMatrix );
-			this._cameraMatrixState.decompose( this.camera.position, this.camera.quaternion, this.camera.scale );
-	
-			//apply zoom
-			if ( this.enableZoom ) {
-	
-				this.applyTransformMatrix( this.scale( size, this._gizmos.position ) );
-	
-			}
-	
-			this._gizmoMatrixState.copy( gizmoStateTemp );
-			this._cameraMatrixState.copy( cameraStateTemp );
-	
-		};
-	
-		/**
-		 * Draw a grid and add it to the scene
-		 */
-		drawGrid = () => {
-	
-			if ( this.scene != null ) {
-	
-				const color = 0x888888;
-				const multiplier = 3;
-				let size, divisions, maxLength, tick;
-	
-				if ( this.camera.isOrthographicCamera ) {
-	
-					const width = this.camera.right - this.camera.left;
-					const height = this.camera.bottom - this.camera.top;
-	
-					maxLength = Math.max( width, height );
-					tick = maxLength / 20;
-	
-					size = maxLength / this.camera.zoom * multiplier;
-					divisions = size / tick * this.camera.zoom;
-	
-				} else if ( this.camera.isPerspectiveCamera ) {
-	
-					const distance = this.camera.position.distanceTo( this._gizmos.position );
-					const halfFovV = THREE.MathUtils.DEG2RAD * this.camera.fov * 0.5;
-					const halfFovH = Math.atan( ( this.camera.aspect ) * Math.tan( halfFovV ) );
-	
-					maxLength = Math.tan( Math.max( halfFovV, halfFovH ) ) * distance * 2;
-					tick = maxLength / 20;
-	
-					size = maxLength * multiplier;
-					divisions = size / tick;
-	
-				}
-				
-				if ( this._grid == null ) {
-	
-					this._grid = new THREE.GridHelper( size, divisions, color, color );
-					this._grid.position.copy( this._gizmos.position );
-					this._gridPosition.copy( this._grid.position );
-					this._grid.quaternion.copy( this.camera.quaternion  );
-					this._grid.rotateX( Math.PI * 0.5 );
-			
-					this.scene.add( this._grid );
-	
-				}
-	
-			}
-	
-		};
-	
-		/**
-		 * Remove all listeners, stop animations and clean scene
-		 */
-		dispose = () => {
-	
-			if ( this._animationId != -1 ) {
 
-				window.cancelAnimationFrame( this._animationId );
+				}
 
 			}
 
-			this.domElement.removeEventListener( 'pointerdown', this.onPointerDown );
-			this.domElement.removeEventListener( 'pointercancel', this.onPointerCancel )
-			this.domElement.removeEventListener( 'wheel', this.onWheel );
-			this.domElement.removeEventListener('contextmenu', this.onContextMenu);
-
-			window.removeEventListener( 'pointermove', this.onPointerMove );
-			window.removeEventListener( 'pointerup', this.onPointerUp );
+		}
+		/**
+   * Calculate the angular speed
+   * @param {Number} p0 Position at t0
+   * @param {Number} p1 Position at t1
+   * @param {Number} t0 Initial time in milliseconds
+   * @param {Number} t1 Ending time in milliseconds
+   */
 
-			window.removeEventListener( 'resize', this.onWindowResize );
-			window.addEventListener( 'keydown', this.onKeyDown );
 
-			this.scene.remove( this._gizmos );
-			this.disposeGrid();
-	
-		};
-	
-		/**
-		 * remove the grid from the scene
-		 */
-		disposeGrid = () => {
-	
-			if ( this._grid != null && this.scene != null ) {
-	
-				this.scene.remove( this._grid );
-				this._grid = null;
-	
-			}
-	
-		};
-	
-		/**
-		 * Compute the easing out cubic function for ease out effect in animation
-		 * @param {Number} t The absolute progress of the animation in the bound of 0 (beginning of the) and 1 (ending of animation)
-		 * @returns {Number} Result of easing out cubic at time t
-		 */
-		easeOutCubic = ( t ) => {
-	
-			return 1 - Math.pow( 1 - t, 3 );
-	
-		};
-	
-		/**
-		 * Make rotation gizmos more or less visible
-		 * @param {Boolean} isActive If true, make gizmos more visible
-		 */
-		activateGizmos = ( isActive ) => {
-	
-			const gizmoX = this._gizmos.children[ 0 ];
-			const gizmoY = this._gizmos.children[ 1 ];
-			const gizmoZ = this._gizmos.children[ 2 ];
-	
-			if ( isActive ) {
-	 
-				gizmoX.material.setValues( { opacity: 1 } );
-				gizmoY.material.setValues( { opacity: 1 } );
-				gizmoZ.material.setValues( { opacity: 1 } );
-	
-			} else {  
-	
-				gizmoX.material.setValues( { opacity: 0.6 } );
-				gizmoY.material.setValues( { opacity: 0.6 } );
-				gizmoZ.material.setValues( { opacity: 0.6 } );
-	
-			}
-	
-		};
-	
-		/**
-		 * Calculate the cursor position in NDC
-		 * @param {number} x Cursor horizontal coordinate within the canvas 
-		 * @param {number} y Cursor vertical coordinate within the canvas
-		 * @param {HTMLElement} canvas The canvas where the renderer draws its output
-		 * @returns {THREE.Vector2} Cursor normalized position inside the canvas
-		 */
-		getCursorNDC = ( cursorX, cursorY, canvas ) => {
-	
-			const canvasRect = canvas.getBoundingClientRect();
-			this._v2_1.setX ( ( ( cursorX - canvasRect.left ) / canvasRect.width ) * 2 - 1 );
-			this._v2_1.setY( ( ( canvasRect.bottom - cursorY ) / canvasRect.height ) * 2 - 1 );
-			return this._v2_1.clone();
-	
-		};
-	
-		/**
-		 * Calculate the cursor position inside the canvas x/y coordinates with the origin being in the center of the canvas
-		 * @param {Number} x Cursor horizontal coordinate within the canvas 
-		 * @param {Number} y Cursor vertical coordinate within the canvas
-		 * @param {HTMLElement} canvas The canvas where the renderer draws its output
-		 * @returns {THREE.Vector2} Cursor position inside the canvas
-		 */
-		getCursorPosition = ( cursorX, cursorY, canvas ) => {
-	
-			this._v2_1.copy( this.getCursorNDC( cursorX, cursorY, canvas) );
-			this._v2_1.x *= ( this.camera.right - this.camera.left ) * 0.5;
-			this._v2_1.y *= ( this.camera.top - this.camera.bottom ) * 0.5;
-			return this._v2_1.clone();
-	
-		};
-	
-		/**
-		 * Set the camera to be controlled
-		 * @param {Camera} camera The virtual camera to be controlled
-		 */
-		setCamera = ( camera ) => {
-	
-			camera.lookAt( this._tbCenter );
-			camera.updateMatrix();
-	
-			//setting state
-			if ( camera.type == 'PerspectiveCamera' ) {
-	
-				this._fov0 = camera.fov;
-				this._fovState = camera.fov;
-	
-			}
-			this._cameraMatrixState0.copy( camera.matrix );
-			this._cameraMatrixState.copy( this._cameraMatrixState0 );
-			this._cameraProjectionState.copy( camera.projectionMatrix );
-			this._zoom0 = camera.zoom;
-			this._zoomState = this._zoom0;
-	
-			this._initialNear = camera.near;
-			this._nearPos0 = camera.position.distanceTo( this._tbCenter ) - camera.near;
-			this._nearPos = this._initialNear;
-	
-			this._initialFar = camera.far;
-			this._farPos0 = camera.position.distanceTo( this._tbCenter ) - camera.far;
-			this._farPos = this._initialFar;
-	
-			this._up0.copy( camera.up );
-			this._upState.copy( camera.up );
-	
-			this.camera = camera;
-			this.camera.updateProjectionMatrix();
-	
-			//making gizmos
-			this._tbRadius = this.calculateTbRadius( camera );
-			this.makeGizmos( this._tbCenter, this._tbRadius );
-	
-		};
-	
 		/**
-		 * Set gizmos visibility
-		 * @param {Boolean} value Value of gizmos visibility
-		 */
+   * Set gizmos visibility
+   * @param {Boolean} value Value of gizmos visibility
+   */
 		setGizmosVisible( value ) {
-	
+
 			this._gizmos.visible = value;
 			this.dispatchEvent( _changeEvent );
-			
-		};
-	
-		/**
-		 * Creates the rotation gizmos matching trackball center and radius
-		 * @param {THREE.Vector3} tbCenter The trackball center
-		 * @param {number} tbRadius The trackball radius
-		 */
-		makeGizmos = ( tbCenter, tbRadius ) => {
-	
-			const curve = new THREE.EllipseCurve( 0, 0, tbRadius, tbRadius );
-			const points = curve.getPoints( this._curvePts );
-	
-			//geometry
-			const curveGeometry = new THREE.BufferGeometry().setFromPoints( points );
-	
-			//material 
-			const curveMaterialX = new THREE.LineBasicMaterial( { color: 0xff8080, fog: false, transparent: true, opacity: 0.6 } );
-			const curveMaterialY = new THREE.LineBasicMaterial( { color: 0x80ff80, fog: false, transparent: true, opacity: 0.6 } );
-			const curveMaterialZ = new THREE.LineBasicMaterial( { color: 0x8080ff, fog: false, transparent: true, opacity: 0.6 } );
-	
-			//line
-			const gizmoX = new THREE.Line( curveGeometry, curveMaterialX );
-			const gizmoY = new THREE.Line( curveGeometry, curveMaterialY );
-			const gizmoZ = new THREE.Line( curveGeometry, curveMaterialZ );
-	
-			const rotation = Math.PI * 0.5;
-			gizmoX.rotation.x = rotation;
-			gizmoY.rotation.y = rotation;
-	
-	
-			//setting state
-			this._gizmoMatrixState0.identity().setPosition( tbCenter ) ;
-			this._gizmoMatrixState.copy( this._gizmoMatrixState0 );
-	
-			if ( this.camera.zoom != 1 ) {
-	
-				//adapt gizmos size to camera zoom
-				const size = 1 / this.camera.zoom;
-				this._scaleMatrix.makeScale( size, size, size );
-				this._translationMatrix.makeTranslation( -tbCenter.x, -tbCenter.y, -tbCenter.z );
-	
-				this._gizmoMatrixState.premultiply( this._translationMatrix ).premultiply( this._scaleMatrix );
-				this._translationMatrix.makeTranslation( tbCenter.x, tbCenter.y, tbCenter.z );
-				this._gizmoMatrixState.premultiply( this._translationMatrix );
-				
-			}
-	
-			this._gizmoMatrixState.decompose( this._gizmos.position, this._gizmos.quaternion, this._gizmos.scale );
-	
-			this._gizmos.clear();
-	
-			this._gizmos.add( gizmoX );
-			this._gizmos.add( gizmoY );
-			this._gizmos.add( gizmoZ );
-	
-		};
-	
-		/**
-		 * Perform animation for focus operation
-		 * @param {Number} time Instant in which this function is called as performance.now()
-		 * @param {THREE.Vector3} point Point of interest for focus operation
-		 * @param {THREE.Matrix4} cameraMatrix Camera matrix
-		 * @param {THREE.Matrix4} gizmoMatrix Gizmos matrix
-		 */
-		onFocusAnim = ( time, point, cameraMatrix, gizmoMatrix ) => {
-	
-			if ( this._timeStart == -1 ) {
-	
-				//animation start
-				this._timeStart = time;
-	
-			}
-	
-			if ( this._state == STATE.ANIMATION_FOCUS ) {
-	
-				const deltaTime = time - this._timeStart;
-				const animTime = deltaTime / this.focusAnimationTime;
-	
-				this._gizmoMatrixState.copy( gizmoMatrix );
-	
-				if ( animTime >= 1)  {
-	
-					//animation end
-					this._gizmoMatrixState.decompose( this._gizmos.position, this._gizmos.quaternion, this._gizmos.scale );
-	
-					this.focus( point, this.scaleFactor );
-	
-					this._timeStart = -1;
-					this.updateTbState( STATE.IDLE, false );
-					this.activateGizmos( false );
-		
-					this.dispatchEvent( _changeEvent ); 
-	
-				} else {
-	
-					const amount = this.easeOutCubic( animTime );
-					const size = ( ( 1 - amount ) + ( this.scaleFactor * amount ) );
-	  
-					this._gizmoMatrixState.decompose( this._gizmos.position, this._gizmos.quaternion, this._gizmos.scale );
-					this.focus( point, size, amount );
-	
-					this.dispatchEvent( _changeEvent );
-					const self = this;
-					this._animationId = window.requestAnimationFrame( function( t ) {
-	
-						self.onFocusAnim( t, point, cameraMatrix, gizmoMatrix.clone() );
-	
-					} );
-	
-				}
-	
-			} else {
-	
-				//interrupt animation
-				this._timeStart = -1;
-				this._animationId = -1;
-		
-			}
-	
-		};
-		
-		/**
-		 * Perform animation for rotation operation
-		 * @param {Number} time Instant in which this function is called as performance.now()
-		 * @param {THREE.Vector3} rotationAxis Rotation axis
-		 * @param {number} w0 Initial angular velocity
-		 */
-		onRotationAnim = ( time, rotationAxis, w0 ) => {
-	
-			if ( this._timeStart == -1 ) {
-	
-				//animation start
-				this._anglePrev = 0
-				this._angleCurrent = 0;
-				this._timeStart = time;
-	
-			}
-	
-			if ( this._state == STATE.ANIMATION_ROTATE ) {
-	
-				//w = w0 + alpha * t
-				const deltaTime = ( time - this._timeStart ) / 1000;
-				const w = w0 + ( ( -this.dampingFactor ) * deltaTime );
-				
-				if ( w > 0 ) {
-	
-					//tetha = 0.5 * alpha * t^2 + w0 * t + tetha0
-					this._angleCurrent = 0.5 * ( -this.dampingFactor ) * Math.pow( deltaTime, 2 ) + w0 * deltaTime + 0;
-					this.applyTransformMatrix( this.rotate( rotationAxis, this._angleCurrent ) );
-					this.dispatchEvent( _changeEvent );
-					const self = this;
-					this._animationId = window.requestAnimationFrame( function( t ) {
-	
-						self.onRotationAnim( t, rotationAxis, w0 );
-	
-					} );
-	
-				} else {
-	
-					this._animationId = -1;
-					this._timeStart = -1;
-
-					this.updateTbState( STATE.IDLE, false );
-					this.activateGizmos( false );
-	
-					this.dispatchEvent( _changeEvent );
-	
-				}
-	
-			} else {
-	
-				//interrupt animation
 
-				this._animationId = -1;
-				this._timeStart = -1;
+		}
+		/**
+   * Creates the rotation gizmos matching trackball center and radius
+   * @param {Vector3} tbCenter The trackball center
+   * @param {number} tbRadius The trackball radius
+   */
 
-				if ( this._state != STATE.ROTATE ) {
-	
-					this.activateGizmos( false );
-					this.dispatchEvent ( _changeEvent );
 
-				}
-			
-			}
-	
-		};
-	
-		
 		/**
-		 * Perform pan operation moving camera between two points
-		 * @param {THREE.Vector3} p0 Initial point
-		 * @param {THREE.Vector3} p1 Ending point
-		 * @param {Boolean} adjust If movement should be adjusted considering camera distance (Perspective only)
-		 */
-		pan = ( p0, p1, adjust = false ) => {
-	
-			const movement = p0.clone().sub( p1 );
-	
-			if ( this.camera.isOrthographicCamera ) {
-	
-				//adjust movement amount
-				movement.multiplyScalar( 1 / this.camera.zoom );
-	
-			} else if ( this.camera.isPerspectiveCamera && adjust ) {
-	
-				//adjust movement amount
-				this._v3_1.setFromMatrixPosition( this._cameraMatrixState0 );	//camera's initial position
-				this._v3_2.setFromMatrixPosition( this._gizmoMatrixState0 );	//gizmo's initial position
-				const distanceFactor = this._v3_1.distanceTo( this._v3_2 ) / this.camera.position.distanceTo( this._gizmos.position );
-				movement.multiplyScalar( 1 / distanceFactor );
-	
-			}
-	
-			this._v3_1.set( movement.x, movement.y, 0 ).applyQuaternion( this.camera.quaternion );
-	
-			this._m4_1.makeTranslation( this._v3_1.x, this._v3_1.y,this. _v3_1.z );
-		   
-			this.setTransformationMatrices( this._m4_1, this._m4_1 );
-			return _transformation;
-	
-		};
-	
-		/**
-		 * Reset trackball
-		 */
-		reset = () => {
-	
-			this.camera.zoom = this._zoom0;
-		
-			if( this.camera.isPerspectiveCamera ) {
-	
-				this.camera.fov = this._fov0;
-	
-			}
-	
-			this.camera.near = this._nearPos;
-			this.camera.far = this._farPos;
-			this._cameraMatrixState.copy( this._cameraMatrixState0 );
-			this._cameraMatrixState.decompose( this.camera.position, this.camera.quaternion, this.camera.scale );
-			this.camera.up.copy( this._up0 );
-	
-			this.camera.updateMatrix();
-			this.camera.updateProjectionMatrix();
-	
-			this._gizmoMatrixState.copy (this._gizmoMatrixState0 );
-			this._gizmoMatrixState0.decompose( this._gizmos.position, this._gizmos.quaternion, this._gizmos.scale );
-			this._gizmos.updateMatrix();
-	
-			this._tbRadius = this.calculateTbRadius( this.camera );
-			this.makeGizmos(this._gizmos.position, this._tbRadius);
-	
-			this.camera.lookAt( this._gizmos.position );
-	
-			this.updateTbState( STATE.IDLE, false );
-			
-			this.dispatchEvent( _changeEvent );
-	
-		};
-	
-		/**
-		 * Rotate the camera around an axis passing by trackball's center
-		 * @param {THREE.Vector3} axis Rotation axis
-		 * @param {number} angle Angle in radians
-		 * @returns {Object} Object with 'camera' field containing transformation matrix resulting from the operation to be applied to the camera
-		 */
-		rotate = ( axis, angle ) => {
-	
-			const point = this._gizmos.position;    //rotation center
-			this._translationMatrix.makeTranslation( -point.x, -point.y, -point.z );
-			this._rotationMatrix.makeRotationAxis( axis, -angle );
-	
-			//rotate camera
-			this._m4_1.makeTranslation( point.x, point.y, point.z );
-			this._m4_1.multiply( this._rotationMatrix );
-			this._m4_1.multiply( this._translationMatrix );
-	
-			this.setTransformationMatrices( this._m4_1 );
-	
-			return _transformation;
-	
-		};
-	
-		copyState = () => {
-	
-			let state;
-			if ( this.camera.isOrthographicCamera ) {
-	
-				state = JSON.stringify( { arcballState: { 
-					
-					cameraFar: this.camera.far, 
-					cameraMatrix: this.camera.matrix, 
-					cameraNear: this.camera.near, 
-					cameraUp: this.camera.up, 
-					cameraZoom: this.camera.zoom, 
-					gizmoMatrix: this._gizmos.matrix 
-	
-				} } );
-	
-			} else if ( this.camera.isPerspectiveCamera ) {
-	
-				state = JSON.stringify( { arcballState: { 
-					cameraFar: this.camera.far,
-					cameraFov: this.camera.fov,  
-					cameraMatrix: this.camera.matrix, 
-					cameraNear: this.camera.near, 
-					cameraUp: this.camera.up, 
-					cameraZoom: this.camera.zoom, 
-					gizmoMatrix: this._gizmos.matrix 
-					
-				} } );
-	
-			}
-			
-			navigator.clipboard.writeText( state );
-	
-		};
-	
-		pasteState = () => {
-	
-			const self = this;
-			navigator.clipboard.readText().then( function resolved( value ) {
-	
-				self.setStateFromJSON( value );
-				
-			} );
-	
-		};
-	
-		/**
-		 * Save the current state of the control. This can later be recover with .reset
-		 */
-		saveState = () => {
-	 
-			this._cameraMatrixState0.copy( this.camera.matrix );
-			this._gizmoMatrixState0.copy( this._gizmos.matrix );
-			this._nearPos = this.camera.near;
-			this._farPos = this.camera.far;
-			this._zoom0 = this.camera.zoom;
-			this._up0.copy( this.camera.up );
-	
-			if ( this.camera.isPerspectiveCamera ) {
-	
-				this._fov0 = this.camera.fov;
-	
-			}
-	
-		};
-	
-		/**
-		 * Perform uniform scale operation around a given point
-		 * @param {Number} size Scale factor
-		 * @param {THREE.Vector3} point Point around which scale 
-		 * @param {Boolean} scaleGizmos If gizmos should be scaled (Perspective only)
-		 * @returns {Object} Object with 'camera' and 'gizmo' fields containing transformation matrices resulting from the operation to be applied to the camera and gizmos
-		 */
-		scale = ( size, point, scaleGizmos = true ) => {
-	
-			const scalePoint = point.clone();
-			let sizeInverse = 1 / size;
-			
-			if ( this.camera.isOrthographicCamera ) {
-	
-				//camera zoom
-				this.camera.zoom = this._zoomState;
-				this.camera.zoom *= size;
-	
-				//check min and max zoom
-				if ( this.camera.zoom > this.maxZoom ) {
-	
-					this.camera.zoom = this.maxZoom;
-					sizeInverse = this._zoomState / this.maxZoom;
-	
-				}
-				else if ( this.camera.zoom < this.minZoom ) {
-	
-					this.camera.zoom = this.minZoom;
-					sizeInverse = this._zoomState / this.minZoom;
-	
-				}
-	
-				this.camera.updateProjectionMatrix();
-	
-				this._v3_1.setFromMatrixPosition( this._gizmoMatrixState );	//gizmos position
-	
-				//scale gizmos so they appear in the same spot having the same dimension
-				this._scaleMatrix.makeScale(sizeInverse, sizeInverse, sizeInverse);
-				this._translationMatrix.makeTranslation( -this._v3_1.x, -this._v3_1.y, -this._v3_1.z );
-	
-				this._m4_2.makeTranslation( this._v3_1.x, this._v3_1.y, this._v3_1.z ).multiply( this._scaleMatrix );
-				this._m4_2.multiply( this._translationMatrix );
-	
-	
-				//move camera and gizmos to obtain pinch effect
-				scalePoint.sub( this._v3_1 );
-	
-				const amount = scalePoint.clone().multiplyScalar( sizeInverse );
-				scalePoint.sub( amount );
-	
-				this._m4_1.makeTranslation( scalePoint.x, scalePoint.y, scalePoint.z );
-				this._m4_2.premultiply( this._m4_1 );   
-	
-				this.setTransformationMatrices( this._m4_1, this._m4_2 );
-				return _transformation;
-	
-			} else if ( this.camera.isPerspectiveCamera ) {
-			   
-				this._v3_1.setFromMatrixPosition( this._cameraMatrixState );
-				this._v3_2.setFromMatrixPosition( this._gizmoMatrixState );
-	
-				//move camera
-				let distance = this._v3_1.distanceTo( scalePoint );
-				let amount = distance - ( distance * sizeInverse );
-	
-				//check min and max distance
-				const newDistance = distance - amount
-				if ( newDistance < this.minDistance ) {
-	
-					sizeInverse = this.minDistance / distance;
-					amount = distance - ( distance * sizeInverse );
-	
-				} else if ( newDistance > this.maxDistance ) {
-	
-					sizeInverse = this.maxDistance / distance;
-					amount = distance - ( distance * sizeInverse );    
-	
-				}
-	
-				let direction = scalePoint.clone().sub( this._v3_1 ).normalize().multiplyScalar( amount );
-	
-				this._m4_1.makeTranslation( direction.x, direction.y, direction.z );
-	
-				
-				if ( scaleGizmos ) {
-	
-					//scale gizmos so they appear in the same spot having the same dimension
-					const pos = this._v3_2;
-	
-					distance = pos.distanceTo( scalePoint );
-					amount = distance - ( distance * sizeInverse );
-					direction = scalePoint.clone().sub( this._v3_2 ).normalize().multiplyScalar( amount );
-	
-					this._translationMatrix.makeTranslation( pos.x, pos.y, pos.z );
-					this._scaleMatrix.makeScale( sizeInverse, sizeInverse, sizeInverse );
-	
-					this._m4_2.makeTranslation( direction.x, direction.y, direction.z ).multiply( this._translationMatrix );
-					this._m4_2.multiply( this._scaleMatrix );
-	
-					this._translationMatrix.makeTranslation( -pos.x, -pos.y, -pos.z );
-	
-					this._m4_2.multiply( this._translationMatrix );
-					this.setTransformationMatrices( this._m4_1, this._m4_2 );
-	
-	
-				} else {
-	
-					this.setTransformationMatrices( this._m4_1 );
-	
-				}
-	
-				return _transformation;
-	
-			}
-	
-		};
-	
-		/**
-		 * Set camera fov
-		 * @param {Number} value fov to be setted 
-		 */
-		setFov = ( value ) => {
-	
-			if ( this.camera.isPerspectiveCamera ) {
-	
-				this.camera.fov = THREE.MathUtils.clamp( value, this.minFov, this.maxFov );
-				this.camera.updateProjectionMatrix();
-	
-			}
-	
-		};
-	
-		/**
-		 * Set the trackball's center point
-		 * @param {Number} x X coordinate
-		 * @param {Number} y Y coordinate
-		 * @param {Number} z Z coordinate
-		 */
-		setTarget = ( x, y, z ) => {
-	
-			this._tbCenter.set( x, y, z );
-			this._gizmos.position.set( x, y, z );	//for correct radius calculation
-			this._tbRadius = this.calculateTbRadius( this.camera );
-	
-			this.makeGizmos( this._tbCenter, this._tbRadius );
-			this.camera.lookAt( this._tbCenter );
-	
-		};
-	
-		/**
-		 * Set values in transformation object
-		 * @param {THREE.Matrix4} camera Transformation to be applied to the camera 
-		 * @param {THREE.Matrix4} gizmos Transformation to be applied to gizmos
-		 */
-		 setTransformationMatrices( camera = null, gizmos = null) {
-			 
+   * Set values in transformation object
+   * @param {Matrix4} camera Transformation to be applied to the camera
+   * @param {Matrix4} gizmos Transformation to be applied to gizmos
+   */
+		setTransformationMatrices( camera = null, gizmos = null ) {
+
 			if ( camera != null ) {
-	
+
 				if ( _transformation.camera != null ) {
-	
+
 					_transformation.camera.copy( camera );
-	
+
 				} else {
-	
+
 					_transformation.camera = camera.clone();
-	
+
 				}
-	
+
 			} else {
-	
+
 				_transformation.camera = null;
-	
+
 			}
-	
+
 			if ( gizmos != null ) {
-	
+
 				if ( _transformation.gizmos != null ) {
-	
+
 					_transformation.gizmos.copy( gizmos );
-	
+
 				} else {
-	
+
 					_transformation.gizmos = gizmos.clone();
-	
+
 				}
-	
+
 			} else {
-	
+
 				_transformation.gizmos = null;
-	
-			}
-	
-		};
-	
-		/**
-		 * Rotate camera around its direction axis passing by a given point by a given angle
-		 * @param {THREE.Vector3} point The point where the rotation axis is passing trough
-		 * @param {Number} angle Angle in radians
-		 * @returns The computed transormation matix
-		 */
-		zRotate = ( point, angle ) => {
-	
-			this._rotationMatrix.makeRotationAxis( this._rotationAxis, angle );
-			this._translationMatrix.makeTranslation( -point.x, -point.y, -point.z );
-	
-			this._m4_1.makeTranslation( point.x, point.y, point.z );
-			this._m4_1.multiply( this._rotationMatrix );
-			this._m4_1.multiply( this._translationMatrix );
-	
-			this._v3_1.setFromMatrixPosition( this._gizmoMatrixState ).sub( point );	//vector from rotation center to gizmos position
-			this._v3_2.copy( this._v3_1 ).applyAxisAngle( this._rotationAxis, angle );	//apply rotation
-			this._v3_2.sub( this._v3_1 );
-	
-			this._m4_2.makeTranslation( this._v3_2.x, this._v3_2.y, this._v3_2.z );
-	
-			this.setTransformationMatrices( this._m4_1, this._m4_2 );
-			return _transformation;
-	
-		};
-		
-	
-		/**
-		 * Unproject the cursor on the 3D object surface
-		 * @param {THREE.Vector2} cursor Cursor coordinates in NDC
-		 * @param {Camera} camera Virtual camera
-		 * @returns {THREE.Vector3} The point of intersection with the model, if exist, null otherwise
-		 */
-		unprojectOnObj = ( cursor, camera ) => {
-	
-			const raycaster = new THREE.Raycaster();
-			raycaster.near = camera.near;
-			raycaster.far = camera.far;
-			raycaster.setFromCamera( cursor, camera );
-	
-			const intersect = raycaster.intersectObjects( this.scene.children, true );
-	
-			for ( let i = 0; i < intersect.length; i++ ) {
-	
-				if ( intersect[ i ].object.uuid != this._gizmos.uuid && intersect[ i ].face != null ) {
-	
-					return intersect[ i ].point.clone();
-	
-				}
-	
-			}
-			
-			return  null;
-		};
-	
-		/**
-		 * Unproject the cursor on the trackball surface
-		 * @param {Camera} camera The virtual camera
-		 * @param {Number} cursorX Cursor horizontal coordinate on screen
-		 * @param {Number} cursorY Cursor vertical coordinate on screen
-		 * @param {HTMLElement} canvas The canvas where the renderer draws its output
-		 * @param {number} tbRadius The trackball radius
-		 * @returns {THREE.Vector3} The unprojected point on the trackball surface
-		 */
-		unprojectOnTbSurface = ( camera, cursorX, cursorY, canvas, tbRadius ) => {
-	
-			if ( camera.type == 'OrthographicCamera' ) {
-	
-				this._v2_1.copy( this.getCursorPosition ( cursorX, cursorY, canvas ) );
-				this._v3_1.set( this._v2_1.x, this._v2_1.y, 0 );
-	
-				const x2 = Math.pow( this._v2_1.x, 2 );
-				const y2 = Math.pow( this._v2_1.y, 2 );
-				const r2 = Math.pow( this._tbRadius, 2 );
-	
-				if ( x2 + y2 <= r2 * 0.5 ) {
-	
-					//intersection with sphere
-					this._v3_1.setZ( Math.sqrt( r2 - ( x2 + y2 ) ) );
-	
-				} else {
-	
-					//intersection with hyperboloid
-					this._v3_1.setZ( ( r2 * 0.5 ) / ( Math.sqrt( x2 + y2 ) ) );
-				}
-	
-				return this._v3_1;
-	
-			} else if ( camera.type == 'PerspectiveCamera' ) {
-	
-				//unproject cursor on the near plane
-				this._v2_1.copy( this.getCursorNDC( cursorX, cursorY, canvas ) );
-	
-				this._v3_1.set( this._v2_1.x, this._v2_1.y, -1 );
-				this._v3_1.applyMatrix4( camera.projectionMatrixInverse );
-	
-				const rayDir = this._v3_1.clone().normalize(); //unprojected ray direction
-				const cameraGizmoDistance = camera.position.distanceTo( this._gizmos.position );
-				const radius2 = Math.pow( tbRadius, 2 );
-			
-				//	  camera
-				//		|\
-				//		| \
-				//		|  \
-				//	h	|	\
-				//		| 	 \
-				//		| 	  \
-				//	_ _ | _ _ _\ _ _  near plane
-				//			l
-				
-				const h = this._v3_1.z;
-				const l = Math.sqrt( Math.pow( this._v3_1.x, 2 ) + Math.pow( this._v3_1.y, 2 ) );
-	
-				if ( l == 0 ) {
-	
-					//ray aligned with camera
-					rayDir.set( this._v3_1.x, this._v3_1.y, tbRadius );
-					return rayDir;
-	
-				}
-	
-				const m = h / l;
-				const q = cameraGizmoDistance;
-			
-				/*
-				 * calculate intersection point between unprojected ray and trackball surface
-				 *|y = m * x + q
-				 *|x^2 + y^2 = r^2
-				 *
-				 * (m^2 + 1) * x^2 + (2 * m * q) * x + q^2 - r^2 = 0
-				 */
-				let a = Math.pow( m, 2 ) + 1;
-				let b = 2 * m * q;
-				let c = Math.pow( q, 2 ) - radius2;
-				let delta = Math.pow( b, 2 ) - ( 4 * a * c );
-			
-				if ( delta >= 0 ) {
-	
-					//intersection with sphere
-					this._v2_1.setX( ( -b - Math.sqrt( delta ) ) / ( 2 * a ) );
-					this._v2_1.setY( m * this._v2_1.x + q );
-	
-					let angle = THREE.MathUtils.RAD2DEG * this._v2_1.angle();
-	
-					if ( angle >= 45 ) {
-	
-						//if angle between intersection point and X' axis is >= 45°, return that point
-						//otherwise, calculate intersection point with hyperboloid
-				
-						let rayLength = Math.sqrt( Math.pow( this._v2_1.x, 2 ) + Math.pow( ( cameraGizmoDistance - this._v2_1.y ), 2 ) );
-						rayDir.multiplyScalar( rayLength );
-						rayDir.z += cameraGizmoDistance;
-						return rayDir;
-	
-					}
-	
-				} 
-	
-				//intersection with hyperboloid
-				/*
-				 *|y = m * x + q
-				 *|y = (1 / x) * (r^2 / 2)
-				 *
-				 * m * x^2 + q * x - r^2 / 2 = 0
-				 */
-	
-				a = m;
-				b = q;
-				c = -radius2 * 0.5;
-				delta = Math.pow( b, 2 ) - ( 4 * a * c );
-				this._v2_1.setX( ( -b - Math.sqrt( delta ) ) / ( 2 * a ) );
-				this._v2_1.setY( m * this._v2_1.x + q );
-	
-				let rayLength = Math.sqrt( Math.pow( this._v2_1.x, 2 ) + Math.pow( ( cameraGizmoDistance - this._v2_1.y ), 2 ) );
-	
-				rayDir.multiplyScalar( rayLength );
-				rayDir.z += cameraGizmoDistance;
-				return rayDir;
-	
-			}
-	
-		};
-	
-	
-		/**
-		 * Unproject the cursor on the plane passing through the center of the trackball orthogonal to the camera
-		 * @param {Camera} camera The virtual camera
-		 * @param {Number} cursorX Cursor horizontal coordinate on screen
-		 * @param {Number} cursorY Cursor vertical coordinate on screen
-		 * @param {HTMLElement} canvas The canvas where the renderer draws its output
-		 * @param {Boolean} initialDistance If initial distance between camera and gizmos should be used for calculations instead of current (Perspective only)
-		 * @returns {THREE.Vector3} The unprojected point on the trackball plane
-		 */
-		unprojectOnTbPlane = ( camera, cursorX, cursorY, canvas, initialDistance = false ) => {
-	
-			if ( camera.type == 'OrthographicCamera' ) {
-	
-				this._v2_1.copy( this.getCursorPosition( cursorX, cursorY, canvas ) );
-				this._v3_1.set( this._v2_1.x, this._v2_1.y, 0 );
-	
-				return this._v3_1.clone();
-	
-			} else if ( camera.type == 'PerspectiveCamera' ) {
-				
-				this._v2_1.copy( this.getCursorNDC( cursorX, cursorY, canvas ) );
-	
-				//unproject cursor on the near plane
-				this._v3_1.set( this._v2_1.x, this._v2_1.y, -1 );
-				this._v3_1.applyMatrix4( camera.projectionMatrixInverse );
-	
-				const rayDir = this._v3_1.clone().normalize();    //unprojected ray direction
-	
-				//	  camera
-				//		|\
-				//		| \
-				//		|  \
-				//	h	|	\
-				//		| 	 \
-				//		| 	  \
-				//	_ _ | _ _ _\ _ _  near plane
-				//			l
-	
-				const h = this._v3_1.z;
-				const l = Math.sqrt( Math.pow( this._v3_1.x, 2 ) + Math.pow( this._v3_1.y, 2 ) );
-				let cameraGizmoDistance;
-	
-				if ( initialDistance ) {
-	
-					cameraGizmoDistance = this._v3_1.setFromMatrixPosition( this._cameraMatrixState0 ).distanceTo( this._v3_2.setFromMatrixPosition( this._gizmoMatrixState0 ) );
-				
-				} else {
-	
-					cameraGizmoDistance = camera.position.distanceTo( this._gizmos.position );
-	
-				}
-	
-				/*
-				 * calculate intersection point between unprojected ray and the plane
-				 *|y = mx + q
-				 *|y = 0
-				 *
-				 * x = -q/m
-				*/
-				if ( l == 0 ) {
-	
-					//ray aligned with camera
-					rayDir.set( 0, 0, 0 );
-					return rayDir;
-	
-				}
-				
-				const m = h / l;
-				const q = cameraGizmoDistance;
-				const x = -q / m;
-	
-				const rayLength = Math.sqrt( Math.pow( q, 2 ) + Math.pow( x, 2 ) );
-				rayDir.multiplyScalar( rayLength );
-				rayDir.z = 0;
-				return rayDir;
-	
-			}
-			
-		};
-	
-		/**
-		 * Update camera and gizmos state
-		 */
-		updateMatrixState = () => {
-	
-			//update camera and gizmos state
-			this._cameraMatrixState.copy( this.camera.matrix );
-			this._gizmoMatrixState.copy( this._gizmos.matrix );
-	
-			if ( this.camera.isOrthographicCamera ) {
-	
-				this._cameraProjectionState.copy( this.camera.projectionMatrix );
-				this.camera.updateProjectionMatrix();
-				this._zoomState = this.camera.zoom;
-	
-			} else if ( this.camera.isPerspectiveCamera) {
-	
-				this._fovState =  this.camera.fov;
-	
+
 			}
-	
-		};
-	
+
+		}
 		/**
-		 * Update the trackball FSA
-		 * @param {STATE} newState New state of the FSA
-		 * @param {Boolean} updateMatrices If matriices state should be updated
-		 */
-		updateTbState = ( newState, updateMatrices ) => {
-	
-			this._state = newState;
-			if ( updateMatrices ) {
-	
-				this.updateMatrixState();
-	
-			}
-	
-		};
-	
-		update = () => {
-	
-			const EPS = 0.000001;
-	
-			//check min/max parameters
-			if ( this.camera.isOrthographicCamera ) {
-	
-				//check zoom
-				if ( this.camera.zoom > this.maxZoom || this.camera.zoom < this.minZoom ) {
-	
-					const newZoom = THREE.MathUtils.clamp( this.camera.zoom, this.minZoom, this.maxZoom );
-					this.applyTransformMatrix( this.scale( newZoom / this.camera.zoom, this._gizmos.position, true ) );
-							
-				}
-	
-			} else if ( this.camera.isPerspectiveCamera ) {
-	 
-				//check distance
-				const distance = this.camera.position.distanceTo( this._gizmos.position );
-	
-				if ( distance > this.maxDistance + EPS || distance < this.minDistance - EPS ) {
-	
-					const newDistance = THREE.MathUtils.clamp( distance, this.minDistance, this.maxDistance );
-					this.applyTransformMatrix( this.scale( newDistance / distance, this._gizmos.position ) );				
-					this.updateMatrixState();
-	
-				 }
-	
-				//check fov
-				if ( this.camera.fov < this.minFov || this.camera.fov > this.maxFov ) {
-	
-					this.camera.fov = THREE.MathUtils.clamp( this.camera.fov, this.minFov, this.maxFov );
-					this.camera.updateProjectionMatrix();
-	
-				}
-	
-				const oldRadius = this._tbRadius;
-				this._tbRadius = this.calculateTbRadius( this.camera );
-	
-				if ( oldRadius < this._tbRadius - EPS || oldRadius > this._tbRadius + EPS ) {
-	
-					const scale = ( this._gizmos.scale.x + this._gizmos.scale.y + this._gizmos.scale.z ) / 3; 
-					const newRadius = this._tbRadius / scale;
-					const curve = new THREE.EllipseCurve( 0, 0, newRadius, newRadius );
-					const points = curve.getPoints( this._curvePts );
-					const curveGeometry = new THREE.BufferGeometry().setFromPoints( points );
-				
-					for( let gizmo in this._gizmos.children ) {
-				
-						this._gizmos.children[ gizmo ].geometry = curveGeometry;
-				
-					}
-						
-				}
-	
-			}
-	
-			this.camera.lookAt( this._gizmos.position ); 
-	
-		};
-	
-		setStateFromJSON = ( json ) => {
-	
-			const state = JSON.parse( json );
-	
-			if ( state.arcballState != undefined ) {
-	
-				this._cameraMatrixState.fromArray( state.arcballState.cameraMatrix.elements );
-				this._cameraMatrixState.decompose( this.camera.position, this.camera.quaternion, this.camera.scale );
-				
-				this.camera.up.copy( state.arcballState.cameraUp );
-				this.camera.near = state.arcballState.cameraNear;
-				this.camera.far = state.arcballState.cameraFar;
-	
-				this.camera.zoom = state.arcballState.cameraZoom;
-	
-				if ( this.camera.isPerspectiveCamera ) {
-	
-					this.camera.fov = state.arcballState.cameraFov;
-	
-				}
-	
-				this._gizmoMatrixState.fromArray( state.arcballState.gizmoMatrix.elements );
-				this._gizmoMatrixState.decompose( this._gizmos.position, this._gizmos.quaternion, this._gizmos.scale );
-				
-				this.camera.updateMatrix();
-				this.camera.updateProjectionMatrix();
-	
-				this._gizmos.updateMatrix();
-	
-				this._tbRadius = this.calculateTbRadius( this.camera );
-				let gizmoTmp = new THREE.Matrix4().copy( this._gizmoMatrixState0 );
-				this.makeGizmos( this._gizmos.position, this._tbRadius );
-				this._gizmoMatrixState0.copy( gizmoTmp );
-	
-				this.camera.lookAt( this._gizmos.position );
-				this.updateTbState( STATE.IDLE, false );
-	
-				this.dispatchEvent( _changeEvent );
-	
-			}
-	
-		};
-	
-	};
-	
+   * Rotate camera around its direction axis passing by a given point by a given angle
+   * @param {Vector3} point The point where the rotation axis is passing trough
+   * @param {Number} angle Angle in radians
+   * @returns The computed transormation matix
+   */
+
+
+	}
+
 	THREE.ArcballControls = ArcballControls;
 
-} )();
\ No newline at end of file
+} )();
diff --git a/examples/js/controls/TransformControls.js b/examples/js/controls/TransformControls.js
index fdafa5d4d398148d28dcd281e9968096ea2a9cff..6610ec9c84f7a6c7fb8d464c2be1cabe018f83d0 100644
--- a/examples/js/controls/TransformControls.js
+++ b/examples/js/controls/TransformControls.js
@@ -217,27 +217,6 @@
 
 				if ( planeIntersect ) {
 
-					let space = this.space;
-
-					if ( this.mode === 'scale' ) {
-
-						space = 'local';
-
-					} else if ( this.axis === 'E' || this.axis === 'XYZE' || this.axis === 'XYZ' ) {
-
-						space = 'world';
-
-					}
-
-					if ( space === 'local' && this.mode === 'rotate' ) {
-
-						const snap = this.rotationSnap;
-						if ( this.axis === 'X' && snap ) this.object.rotation.x = Math.round( this.object.rotation.x / snap ) * snap;
-						if ( this.axis === 'Y' && snap ) this.object.rotation.y = Math.round( this.object.rotation.y / snap ) * snap;
-						if ( this.axis === 'Z' && snap ) this.object.rotation.z = Math.round( this.object.rotation.z / snap ) * snap;
-
-					}
-
 					this.object.updateMatrixWorld();
 					this.object.parent.updateMatrixWorld();
 
diff --git a/examples/js/csm/Frustum.js b/examples/js/csm/Frustum.js
index 7f324aab4b3b2d5868af75ac7f7fb18902143550..d9300b7a53475ae85c72f653af162e6faa0313a3 100644
--- a/examples/js/csm/Frustum.js
+++ b/examples/js/csm/Frustum.js
@@ -93,7 +93,7 @@
 
 				}
 
-				if ( i === breaks - 1 ) {
+				if ( i === breaks.length - 1 ) {
 
 					for ( let j = 0; j < 4; j ++ ) {
 
diff --git a/examples/js/postprocessing/SAOPass.js b/examples/js/postprocessing/SAOPass.js
index 1e8f9094a149c53eb778efdd130252706128495b..d94f8e2ebb4cda37182a6bb0c8dc50faead0b2c1 100644
--- a/examples/js/postprocessing/SAOPass.js
+++ b/examples/js/postprocessing/SAOPass.js
@@ -6,15 +6,15 @@
 
 	class SAOPass extends THREE.Pass {
 
-		constructor( scene, camera, depthTexture, useNormals, resolution ) {
+		constructor( scene, camera, useDepthTexture = false, useNormals = false, resolution = new THREE.Vector2( 256, 256 ) ) {
 
 			super();
 			this.scene = scene;
 			this.camera = camera;
 			this.clear = true;
 			this.needsSwap = false;
-			this.supportsDepthTextureExtension = depthTexture !== undefined ? depthTexture : false;
-			this.supportsNormalTexture = useNormals !== undefined ? useNormals : false;
+			this.supportsDepthTextureExtension = useDepthTexture;
+			this.supportsNormalTexture = useNormals;
 			this.originalClearColor = new THREE.Color();
 			this._oldClearColor = new THREE.Color();
 			this.oldClearAlpha = 1;
@@ -30,7 +30,7 @@
 				saoBlurStdDev: 4,
 				saoBlurDepthCutoff: 0.01
 			};
-			this.resolution = resolution !== undefined ? new THREE.Vector2( resolution.x, resolution.y ) : new THREE.Vector2( 256, 256 );
+			this.resolution = new THREE.Vector2( resolution.x, resolution.y );
 			this.saoRenderTarget = new THREE.WebGLRenderTarget( this.resolution.x, this.resolution.y, {
 				minFilter: THREE.LinearFilter,
 				magFilter: THREE.LinearFilter,
@@ -44,10 +44,11 @@
 				format: THREE.RGBAFormat
 			} );
 			this.depthRenderTarget = this.normalRenderTarget.clone();
+			let depthTexture;
 
 			if ( this.supportsDepthTextureExtension ) {
 
-				const depthTexture = new THREE.DepthTexture();
+				depthTexture = new THREE.DepthTexture();
 				depthTexture.type = THREE.UnsignedShortType;
 				this.beautyRenderTarget.depthTexture = depthTexture;
 				this.beautyRenderTarget.depthBuffer = true;