[vtkusers] MPI Offscreen Volume Rendering

[Kevin H. Hobbs]

I want to try the vtkParallelRenderManager::GetPixelData method because
the manual says it's "he most appropriate way to retrieve full size
image data after a render." The trouble is I can't just plug that
UnsignedCharArray into an image writer.

How do I set up an image to hold the output of GetPixelData?
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