    extrude = vtkLinearExtrusionFilter()
    extrude.SetInputData(polyData)
    extrude.SetExtrusionTypeToNormalExtrusion()
    extrude.SetVector(nx, ny, nz)
    extrude.Update()

--
    extrude = vtkLinearExtrusionFilter()
    extrude.SetInputData(polyData)
    extrude.SetExtrusionTypeToNormalExtrusion()
    extrude.SetVector(0, 0, 100.0)
    extrude.Update()

--
    extruder = vtkLinearExtrusionFilter()
    extruder.SetInputData(circle)
    extruder.SetScaleFactor(1.0)
    # extruder.SetExtrusionTypeToNormalExtrusion()
    extruder.SetExtrusionTypeToVectorExtrusion()
    extruder.SetVector(0, 0, 1)
--
    Extrude = vtkLinearExtrusionFilter()
    Extrude.SetInputConnection(RibbonFilter.GetOutputPort())
    Extrude.SetVector(0, 1, 0)
    Extrude.SetExtrusionType(1)
    Extrude.SetScaleFactor(0.7)

