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Improve "resample to image" mapper

for Unstructured Grid Volume Rendering:

  1. Generate a MultiBlock ImageData based on the unstructured grid.
  2. Each block has different resolution to effectively sample the cells in its bounds.
  3. Use ResampleWithDataSet to resample the unstructured Grid on to the MultiBlock ImageData.
  4. Use the new vtkMultiBlockVolumeMapper for rendering.

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