rooms.projector = new function(){

  projector = new THREE.Projector();
  vector = new THREE.Vector3( mouse.x, mouse.y, 0.5 );
  projector.unprojectVector( vector, camera );

  raycaster = new THREE.Raycaster( camera.position, vector.sub( camera.position ).normalize() );
  intersects = raycaster.intersectObjects( scene.children, true );

}



THREE.Projector = function () {

	_viewProjectionMatrix = new THREE.Matrix4(),

	this.unprojectVector = function ( vector, camera ) {
		camera.projectionMatrixInverse.getInverse( camera.projectionMatrix );
		
		_viewProjectionMatrix.multiplyMatrices(
			camera.matrixWorld,
			camera.projectionMatrixInverse
		);

		return vector.applyProjection( _viewProjectionMatrix );
	};

}