    appendFilter = vtkAppendFilter()
    appendFilter.AddInputData(polydata)
    appendFilter.AddInputData(ug)
    appendFilter.Update()

    combined = vtkUnstructuredGrid()
--
    appendFilter = vtkAppendFilter()
    appendFilter.AddInputConnection(delaunay1.GetOutputPort())
    appendFilter.AddInputConnection(delaunay2.GetOutputPort())
    appendFilter.Update()

    connectivityFilter = vtkConnectivityFilter()
--
    camAPD = vtkAppendFilter()
    camAPD.AddInputConnection(camCBS.GetOutputPort())
    camAPD.AddInputConnection(camCS.GetOutputPort())

    camMapper = vtkPolyDataMapper()
    camMapper.SetInputConnection(camAPD.GetOutputPort())
--
    append = vtkAppendFilter()

    dims = func.GetSampleDimensions()
    sliceIncr = (dims[2] - 1) // (numberOfPlanes + 1)
    sliceNum = -4
    for i in range(0, numberOfPlanes):
--
    append = vtkAppendFilter()

    dims = func.GetSampleDimensions()
    sliceIncr = (dims[2] - 1) // (numberOfPlanes + 1)

    sliceNum = -4
