    pfn['Henneberg'] = vtkParametricHenneberg()
    pfn['Kuen'] = vtkParametricKuen()
    pfn['PluckerConoid'] = vtkParametricPluckerConoid()
    pfn['Pseudosphere'] = vtkParametricPseudosphere()
    # Now set some parameters.
    pfn["Ellipsoid"].SetXRadius(0.5)
