public TileDataKey(TileMaterialType _material, int _width, int _height, bool _sloped)
 {
     material = _material;
     width    = _width;
     height   = _height;
     sloped   = _sloped;
 }
 public TileDataKey(TileMaterialType _material, int _width, int _height, bool _sloped)
 {
     material = _material;
     width = _width;
     height = _height;
     sloped = _sloped;
 }