text: THREE.DragControls = function ( _objects, _camera, _domElement ) {
  
  	var _plane = new THREE.Plane();
  	var _raycaster = new THREE.Raycaster();
  
  	var _mouse = new THREE.Vector2();
  	var _offset = new THREE.Vector3();
  	var _intersection = new THREE.Vector3();
  	var _worldPosition = new THREE.Vector3();
  	var _inverseMatrix = new THREE.Matrix4();
  	var _intersections = [];
  
  	var _selected = null, _hovered = null;
  
  	//
  
  	var scope = this;
  
  	function activate() {
  
  		_domElement.addEventListener( 'pointermove', onPointerMove );
  		_domElement.addEventListener( 'pointerdown', onPointerDown );
  		_domElement.addEventListener( 'pointerup', onPointerCancel );
  		_domElement.addEventListener( 'pointerleave', onPointerCancel );
  		_domElement.addEventListener( 'touchmove', onTouchMove );
  		_domElement.addEventListener( 'touchstart', onTouchStart );
  		_domElement.addEventListener( 'touchend', onTouchEnd );
  
  	}
  
  	function deactivate() {
  
  		_domElement.removeEventListener( 'pointermove', onPointerMove );
  		_domElement.removeEventListener( 'pointerdown', onPointerDown );
  		_domElement.removeEventListener( 'pointerup', onPointerCancel );
  		_domElement.removeEventListener( 'pointerleave', onPointerCancel );
  		_domElement.removeEventListener( 'touchmove', onTouchMove );
  		_domElement.removeEventListener( 'touchstart', onTouchStart );
  		_domElement.removeEventListener( 'touchend', onTouchEnd );
  
  		_domElement.style.cursor = '';
  
  	}
  
  	function dispose() {
  
  		deactivate();
  
  	}
  
  	function getObjects() {
  
  		return _objects;
  
  	}
  
  	function onPointerMove( event ) {
  
  		event.preventDefault();
  
  		switch ( event.pointerType ) {
  
  			case 'mouse':
  			case 'pen':
  				onMouseMove( event );
  				break;
  
  			// TODO touch
  
  		}
  
  	}
  
  	function onMouseMove( event ) {
  
  		var rect = _domElement.getBoundingClientRect();
  
  		_mouse.x = ( ( event.clientX - rect.left ) / rect.width ) * 2 - 1;
  		_mouse.y = - ( ( event.clientY - rect.top ) / rect.height ) * 2 + 1;
  
  		_raycaster.setFromCamera( _mouse, _camera );
  
  		if ( _selected && scope.enabled ) {
  
  			if ( _raycaster.ray.intersectPlane( _plane, _intersection ) ) {
  
  				_selected.position.copy( _intersection.sub( _offset ).applyMatrix4( _inverseMatrix ) );
  
  			}
  
  			scope.dispatchEvent( { type: 'drag', object: _selected } );
  
  			return;
  
  		}
  
  		_intersections.length = 0;
  
  		_raycaster.setFromCamera( _mouse, _camera );
  		_raycaster.intersectObjects( _objects, true, _intersections );
  
  		if ( _intersections.length > 0 ) {
  
  			var object = _intersections[ 0 ].object;
  
  			_plane.setFromNormalAndCoplanarPoint( _camera.getWorldDirection( _plane.normal ), _worldPosition.setFromMatrixPosition( object.matrixWorld ) );
  
  			if ( _hovered !== object ) {
  
  				scope.dispatchEvent( { type: 'hoveron', object: object } );
  
  				_domElement.style.cursor = 'pointer';
  				_hovered = object;
  
  			}
  
  		} else {
  
  			if ( _hovered !== null ) {
  
  				scope.dispatchEvent( { type: 'hoveroff', object: _hovered } );
  
  				_domElement.style.cursor = 'auto';
  				_hovered = null;
  
  			}
  
  		}
  
  	}
  
  	function onPointerDown( event ) {
  
  		event.preventDefault();
  
  		switch ( event.pointerType ) {
  
  			case 'mouse':
  			case 'pen':
  				onMouseDown( event );
  				break;
  
  			// TODO touch
  
  		}
  
  	}
  
  	function onMouseDown( event ) {
  
  		event.preventDefault();
  
  		_intersections.length = 0;
  
  		_raycaster.setFromCamera( _mouse, _camera );
  		_raycaster.intersectObjects( _objects, true, _intersections );
  
  		if ( _intersections.length > 0 ) {
  
  			_selected = ( scope.transformGroup === true ) ? _objects[ 0 ] : _intersections[ 0 ].object;
  
  			if ( _raycaster.ray.intersectPlane( _plane, _intersection ) ) {
  
  				_inverseMatrix.copy( _selected.parent.matrixWorld ).invert();
  				_offset.copy( _intersection ).sub( _worldPosition.setFromMatrixPosition( _selected.matrixWorld ) );
  
  			}
  
  			_domElement.style.cursor = 'move';
  
  			scope.dispatchEvent( { type: 'dragstart', object: _selected } );
  
  		}
  
  
  	}
  
  	function onPointerCancel( event ) {
  
  		event.preventDefault();
  
  		switch ( event.pointerType ) {
  
  			case 'mouse':
  			case 'pen':
  				onMouseCancel( event );
  				break;
  
  			// TODO touch
  
  		}
  
  	}
  
  	function onMouseCancel( event ) {
  
  		event.preventDefault();
  
  		if ( _selected ) {
  
  			scope.dispatchEvent( { type: 'dragend', object: _selected } );
  
  			_selected = null;
  
  		}
  
  		_domElement.style.cursor = _hovered ? 'pointer' : 'auto';
  
  	}
  
  	function onTouchMove( event ) {
  
  		event.preventDefault();
  		event = event.changedTouches[ 0 ];
  
  		var rect = _domElement.getBoundingClientRect();
  
  		_mouse.x = ( ( event.clientX - rect.left ) / rect.width ) * 2 - 1;
  		_mouse.y = - ( ( event.clientY - rect.top ) / rect.height ) * 2 + 1;
  
  		_raycaster.setFromCamera( _mouse, _camera );
  
  		if ( _selected && scope.enabled ) {
  
  			if ( _raycaster.ray.intersectPlane( _plane, _intersection ) ) {
  
  				_selected.position.copy( _intersection.sub( _offset ).applyMatrix4( _inverseMatrix ) );
  
  			}
  
  			scope.dispatchEvent( { type: 'drag', object: _selected } );
  
  			return;
  
  		}
  
  	}
  
  	function onTouchStart( event ) {
  
  		event.preventDefault();
  		event = event.changedTouches[ 0 ];
  
  		var rect = _domElement.getBoundingClientRect();
  
  		_mouse.x = ( ( event.clientX - rect.left ) / rect.width ) * 2 - 1;
  		_mouse.y = - ( ( event.clientY - rect.top ) / rect.height ) * 2 + 1;
  
  		_intersections.length = 0;
  
  		_raycaster.setFromCamera( _mouse, _camera );
  		 _raycaster.intersectObjects( _objects, true, _intersections );
  
  		if ( _intersections.length > 0 ) {
  
  			_selected = ( scope.transformGroup === true ) ? _objects[ 0 ] : _intersections[ 0 ].object;
  
  			_plane.setFromNormalAndCoplanarPoint( _camera.getWorldDirection( _plane.normal ), _worldPosition.setFromMatrixPosition( _selected.matrixWorld ) );
  
  			if ( _raycaster.ray.intersectPlane( _plane, _intersection ) ) {
  
  				_inverseMatrix.copy( _selected.parent.matrixWorld ).invert();
  				_offset.copy( _intersection ).sub( _worldPosition.setFromMatrixPosition( _selected.matrixWorld ) );
  
  			}
  
  			_domElement.style.cursor = 'move';
  
  			scope.dispatchEvent( { type: 'dragstart', object: _selected } );
  
  		}
  
  
  	}
  
  	function onTouchEnd( event ) {
  
  		event.preventDefault();
  
  		if ( _selected ) {
  
  			scope.dispatchEvent( { type: 'dragend', object: _selected } );
  
  			_selected = null;
  
  		}
  
  		_domElement.style.cursor = 'auto';
  
  	}
  
  	activate();
  
  	// API
  
  	this.enabled = true;
  	this.transformGroup = false;
  
  	this.activate = activate;
  	this.deactivate = deactivate;
  	this.dispose = dispose;
  	this.getObjects = getObjects;
  
  };
  
  THREE.DragControls.prototype = Object.create( THREE.EventDispatcher.prototype );
  THREE.DragControls.prototype.constructor = THREE.DragControls;
  