public void Remove(ILightLayer layer)
 {
     if (layer == null || _layers == null || !_layers.Contains(layer))
     {
         return;
     }
 }
 public void Add(ILightLayer layer)
 {
     if (_layers == null)
     {
         _layers = new List <ILightLayer>();
     }
     _layers.Add(layer);
     layer.Init(_runtime);
 }