code: @Override
      public final Scene draw()
      {
          final NFastArrayList<Layer> layers = getChildNodes();
  
          if (null != layers)
          {
              final int size = layers.size();
  
              for (int i = 0; i < size; i++)
              {
                  final Layer layer = layers.get(i);
  
                  if (null != layer)
                  {
                      layer.draw();
                  }
              }
          }
          return this;
      }
docs: Iterates over the list of {@link Layer} and draws them all.