[vtkusers] access polygons in Python

[Forrest Sheng Bao]

Hi,

I am struggling to access polygon faces in my VTK files using Python.
Suppose I have the following segment in my
file:

POLYGONS 275558 1102232
3 0 1 2
3 3 2 1
3 0 45 46
3 0 46 1
3 0 2 50

I used the piece of code below to prepare:

    import vtk
    Reader = vtk.vtkDataSetReader()
    Reader.SetFileName('my_test_file.vtk')
    Reader.ReadAllScalarsOn()  # Activate the reading of all scalars
    Reader.Update()
    Data = Reader.GetOutput()
    CellData = Data.GetCell(0)


I assume CellData.GetPointId(x) is what I should use. But I got wrong point
ID after x =3.

Can someone help me on this?

Cheers,
Forrest
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