 	import flash.display.Stage3D;
 	import flash.display.StageAlign;
 	import flash.display.StageScaleMode;
-	import flash.display3D.Context3D;
 	import flash.events.Event;
 	import flash.events.MouseEvent;
 	import flash.events.TouchEvent;
 	import flash.geom.Point;
-	import flash.utils.getTimer;
 
 	/**
 	 * The Viewport is the display area where a 3D scene can be rendered.

			var positionOnStage	: Point	= localToGlobal(ZERO2);
			
			if (_stage3d.x != positionOnStage.x || _stage3d.y != positionOnStage.y)
			{
				updateStage3D()
//				updateBackBuffer();
			}
			
			return _backBuffer;
		}

				_stage3d.y = upperLeft.y;

			updateMask();
		}
		
		private function updateMask() : void
