# File vtk/gtk/GtkGLExtVTKRenderWindow.rb, line 382
  def GetCurrentRenderer
    if @CurrentRenderer.nil?
      renderers = @RenderWindow.GetRenderers
      numRenderers = renderers.GetNumberOfItems

      renderers.InitTraversal
      for i in 0...numRenderers
        break if renderer = renderers.GetNextItem
      end
      @CurrentRenderer = renderer
    end
    return @CurrentRenderer
  end