[vtkusers] Obtaining transformation matrix for vtkPolyData

[Eric Petersen]

Hello,

I currently have a Python script where I am successively translating, and
rotating, a vtkPolyData object.  The script currently does not track
individual transforms but I would like to know the current 4x4 transform
matrix.  Is there any way to directly obtain this information from the
vtkPolyData object or am I stuck rewriting the script to track individual
transformations?
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