 			_bufferHeight = Math.max(1, Math.sqrt(_bufferSize / aspect));
 			_bufferWidth  = Math.max(1, _bufferHeight * aspect);
 			dispose();
-			_emissionBmd  = new BitmapData(_bufferWidth, _bufferHeight, false, 0);
-			_bufferBmd    = new BitmapData(_bufferWidth, _bufferHeight, false, 0);
-			_occlusionBmd = new BitmapData(_bufferWidth, _bufferHeight, true, 0);
-			_occlusionBmp = new Bitmap(_occlusionBmd);
+			_baseBmd           = new BitmapData(_bufferWidth, _bufferHeight, false, 0);
+			_bufferBmd         = new BitmapData(_bufferWidth, _bufferHeight, false, 0);
+			_occlusionLoResBmd = new BitmapData(_bufferWidth, _bufferHeight, true, 0);
+			_occlusionLoResBmp = new Bitmap(_occlusionLoResBmd);
 		}
 
 		// Render a single frame.

			m.translate(-tx, -ty);
			m.scale(s, s);
			m.translate(tx, ty);
			_lightBmp.bitmapData = _applyEffect(_emissionBmd, _bufferBmd, m, passes);
			_lightBmp.width = _viewportWidth;
			_lightBmp.height = _viewportHeight;
			_lightBmp.smoothing = smoothing;

		protected var _blurFilter:BlurFilter = new BlurFilter(2, 2);
		protected var _emission:DisplayObject;
		protected var _occlusion:DisplayObject;
		protected var _ct:ColorTransform = new ColorTransform;
		protected var _halve:ColorTransform = new ColorTransform(0.5, 0.5, 0.5);
		protected var _occlusionLoResBmd:BitmapData;
		protected var _occlusionLoResBmp:Bitmap;
		protected var _baseBmd:BitmapData;
		protected var _bufferBmd:BitmapData;
		protected var _lightBmp:Bitmap = new Bitmap;
		protected var _bufferSize:uint = 0x8000;
