    shrink = vtkShrinkPolyData()
    shrink.SetInputConnection(frustumSource.GetOutputPort())
    shrink.SetShrinkFactor(.9)

    mapper = vtkPolyDataMapper()
    mapper.SetInputConnection(shrink.GetOutputPort())
--
    shrink = vtkShrinkPolyData()
    shrink.SetInputConnection(polygonSource.GetOutputPort())
    shrink.SetShrinkFactor(0.9)

    mapper = vtkPolyDataMapper()
    mapper.SetInputConnection(shrink.GetOutputPort())
--
        aShrinker = vtkShrinkPolyData()
        aShrinker.SetShrinkFactor(1)
        aShrinker.SetInputConnection(Marching.GetOutputPort())

        aMapper = vtkPolyDataMapper()
        aMapper.ScalarVisibilityOff()
