[vtkusers] Downsample a multiblock grid

[John Haiducek]

I have a multiblock structured grid which I want to downsample. Paraview
can do it using the Extract Subset filter, but the nearest equivalent in
the VTK API, vtkExtractGrid, appears only to work on single block grids.
Can anyone tell me how to downsample my multiblock grid?

John Haiducek
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