text: /**
   * Based on http://www.emagix.net/academic/mscs-project/item/camera-sync-with-css3-and-webgl-threejs
   * @author mrdoob / http://mrdoob.com/
   */
  
  THREE.CSS3DObject = function ( element ) {
  
  	THREE.Object3D.call( this );
  
  	this.element = element;
  	this.element.style.position = 'absolute';
  
  	this.addEventListener( 'removed', function ( event ) {
  
  		if ( this.element.parentNode !== null ) {
  
  			this.element.parentNode.removeChild( this.element );
  
  		}
  
  	} );
  
  };
  
  THREE.CSS3DObject.prototype = Object.create( THREE.Object3D.prototype );
  THREE.CSS3DObject.prototype.constructor = THREE.CSS3DObject;
  
  THREE.CSS3DSprite = function ( element ) {
  
  	THREE.CSS3DObject.call( this, element );
  
  };
  
  THREE.CSS3DSprite.prototype = Object.create( THREE.CSS3DObject.prototype );
  THREE.CSS3DSprite.prototype.constructor = THREE.CSS3DSprite;
  
  //
  
  THREE.CSS3DRenderer = function () {
  
  	console.log( 'THREE.CSS3DRenderer', THREE.REVISION );
  
  	var _width, _height;
  	var _widthHalf, _heightHalf;
  
  	var matrix = new THREE.Matrix4();
  
  	var cache = {
  		camera: { fov: 0, style: '' },
  		objects: {}
  	};
  
  	var domElement = document.createElement( 'div' );
  	domElement.style.overflow = 'hidden';
  
  	domElement.style.WebkitTransformStyle = 'preserve-3d';
  	domElement.style.MozTransformStyle = 'preserve-3d';
  	domElement.style.oTransformStyle = 'preserve-3d';
  	domElement.style.transformStyle = 'preserve-3d';
  
  	this.domElement = domElement;
  
  	var cameraElement = document.createElement( 'div' );
  
  	cameraElement.style.WebkitTransformStyle = 'preserve-3d';
  	cameraElement.style.MozTransformStyle = 'preserve-3d';
  	cameraElement.style.oTransformStyle = 'preserve-3d';
  	cameraElement.style.transformStyle = 'preserve-3d';
  
  	domElement.appendChild( cameraElement );
  
  	this.setClearColor = function () {};
  
  	this.getSize = function() {
  
  		return {
  			width: _width,
  			height: _height
  		};
  
  	};
  
  	this.setSize = function ( width, height ) {
  
  		_width = width;
  		_height = height;
  
  		_widthHalf = _width / 2;
  		_heightHalf = _height / 2;
  
  		domElement.style.width = width + 'px';
  		domElement.style.height = height + 'px';
  
  		cameraElement.style.width = width + 'px';
  		cameraElement.style.height = height + 'px';
  
  	};
  
  	var epsilon = function ( value ) {
  
  		return Math.abs( value ) < Number.EPSILON ? 0 : value;
  
  	};
  
  	var getCameraCSSMatrix = function ( matrix ) {
  
  		var elements = matrix.elements;
  
  		return 'matrix3d(' +
  			epsilon( elements[ 0 ] ) + ',' +
  			epsilon( - elements[ 1 ] ) + ',' +
  			epsilon( elements[ 2 ] ) + ',' +
  			epsilon( elements[ 3 ] ) + ',' +
  			epsilon( elements[ 4 ] ) + ',' +
  			epsilon( - elements[ 5 ] ) + ',' +
  			epsilon( elements[ 6 ] ) + ',' +
  			epsilon( elements[ 7 ] ) + ',' +
  			epsilon( elements[ 8 ] ) + ',' +
  			epsilon( - elements[ 9 ] ) + ',' +
  			epsilon( elements[ 10 ] ) + ',' +
  			epsilon( elements[ 11 ] ) + ',' +
  			epsilon( elements[ 12 ] ) + ',' +
  			epsilon( - elements[ 13 ] ) + ',' +
  			epsilon( elements[ 14 ] ) + ',' +
  			epsilon( elements[ 15 ] ) +
  		')';
  
  	};
  
  	var getObjectCSSMatrix = function ( matrix ) {
  
  		var elements = matrix.elements;
  
  		return 'translate3d(-50%,-50%,0) matrix3d(' +
  			epsilon( elements[ 0 ] ) + ',' +
  			epsilon( elements[ 1 ] ) + ',' +
  			epsilon( elements[ 2 ] ) + ',' +
  			epsilon( elements[ 3 ] ) + ',' +
  			epsilon( - elements[ 4 ] ) + ',' +
  			epsilon( - elements[ 5 ] ) + ',' +
  			epsilon( - elements[ 6 ] ) + ',' +
  			epsilon( - elements[ 7 ] ) + ',' +
  			epsilon( elements[ 8 ] ) + ',' +
  			epsilon( elements[ 9 ] ) + ',' +
  			epsilon( elements[ 10 ] ) + ',' +
  			epsilon( elements[ 11 ] ) + ',' +
  			epsilon( elements[ 12 ] ) + ',' +
  			epsilon( elements[ 13 ] ) + ',' +
  			epsilon( elements[ 14 ] ) + ',' +
  			epsilon( elements[ 15 ] ) +
  		')';
  
  	};
  
  	var renderObject = function ( object, camera ) {
  
  		if ( object instanceof THREE.CSS3DObject ) {
  
  			var style;
  
  			if ( object instanceof THREE.CSS3DSprite ) {
  
  				// http://swiftcoder.wordpress.com/2008/11/25/constructing-a-billboard-matrix/
  
  				matrix.copy( camera.matrixWorldInverse );
  				matrix.transpose();
  				matrix.copyPosition( object.matrixWorld );
  				matrix.scale( object.scale );
  
  				matrix.elements[ 3 ] = 0;
  				matrix.elements[ 7 ] = 0;
  				matrix.elements[ 11 ] = 0;
  				matrix.elements[ 15 ] = 1;
  
  				style = getObjectCSSMatrix( matrix );
  
  			} else {
  
  				style = getObjectCSSMatrix( object.matrixWorld );
  
  			}
  
  			var element = object.element;
  			var cachedStyle = cache.objects[ object.id ];
  
  			if ( cachedStyle === undefined || cachedStyle !== style ) {
  
  				element.style.WebkitTransform = style;
  				element.style.MozTransform = style;
  				element.style.oTransform = style;
  				element.style.transform = style;
  
  				cache.objects[ object.id ] = style;
  
  			}
  
  			if ( element.parentNode !== cameraElement ) {
  
  				cameraElement.appendChild( element );
  
  			}
  
  		}
  
  		for ( var i = 0, l = object.children.length; i < l; i ++ ) {
  
  			renderObject( object.children[ i ], camera );
  
  		}
  
  	};
  
  	this.render = function ( scene, camera ) {
  
  		var fov = 0.5 / Math.tan( THREE.Math.degToRad( camera.getEffectiveFOV() * 0.5 ) ) * _height;
  
  		if ( cache.camera.fov !== fov ) {
  
  			domElement.style.WebkitPerspective = fov + "px";
  			domElement.style.MozPerspective = fov + "px";
  			domElement.style.oPerspective = fov + "px";
  			domElement.style.perspective = fov + "px";
  
  			cache.camera.fov = fov;
  
  		}
  
  		scene.updateMatrixWorld();
  
  		if ( camera.parent === null ) camera.updateMatrixWorld();
  
  		camera.matrixWorldInverse.getInverse( camera.matrixWorld );
  
  		var style = "translate3d(0,0," + fov + "px)" + getCameraCSSMatrix( camera.matrixWorldInverse ) +
  			" translate3d(" + _widthHalf + "px," + _heightHalf + "px, 0)";
  
  		if ( cache.camera.style !== style ) {
  
  			cameraElement.style.WebkitTransform = style;
  			cameraElement.style.MozTransform = style;
  			cameraElement.style.oTransform = style;
  			cameraElement.style.transform = style;
  
  			cache.camera.style = style;
  
  		}
  
  		renderObject( scene, camera );
  
  	};
  
  };