anchor.diff:  _doLoad() {
     final opaqueImage = _imageLoader.getResource(_opaqueTextureName);
     final transparentImage = _imageLoader.getResource(_transparentTextureName);
  +  final staticTransparentImage = _imageLoader.getResource(_transparentStaticTexture);
   
  -  final textures = _getTextures(transparentImage, opaqueImage);
  +  final textures = _getTextures(transparentImage, opaqueImage, staticTransparentImage);
     _textureData = new TextureData(textures);
   
     CanvasElement canvasElement = query('#textureCanvas');
  
positive.code: 
  #source('../texture_data.dart');
  
  const String _transparentTextureName = '../dart_transparent_01.png';
  const String _opaqueTextureName = '../dart_opaque_01.jpg';
  
  ImageLoader _imageLoader;
  List<String> _keys;
  
negative.code: TextureData _textureData;
  
  main() {
    _imageLoader = new ImageLoader([_transparentTextureName, _opaqueTextureName,
                                    _transparentStaticTexture]);
    _imageLoader.loaded.add((args) => _doLoad());
    _imageLoader.load();
  }
  