[vtkusers] vtkExtractGrid equivalent for multiblock grids

[John Haiducek]

I have a multiblock structured grid and I want to down-sample it in the
manner done by vtkExtractGrid. But vtkExtractGrid only takes
vtkStructuredGrid as input, not vtkMultiblockStructuredGrid. How can I
downsample a multiblock grid?

John Haiducek
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