[Paraview] Is it possible to group vtkImageData objects?

[A .]

Dear community,


Is it possible with ParaView to group vtkImageData objects in a single file format? I would like to import a couple of regular grids (i.e. vtkImageData objects) as a single file, rather than as grid_1.pvti, grid_2.pvti, etc... Once imported I would like to simply select which grid to visualize (with volume rendering).


I tried the following structures already:


  1.  vktMultiBlockDataSet containing N vtkImageData objects as child blocks.
  2.  vtkMultiBlockDataSet containing 1 vtkMultiPieceDataSet, which contains N vtkImageData objects as child pieces

The first structure kind of works, but in order to visualize one vtkImageData I need to "Extract Block" and "Resample to Image", which doesn't result in the exact same image when doing volume rendering.
The second structure mixes my vtkImageData into a single data object. I cannot do something like "Extract Piece".

The main reason I want to have a single data structure containing all my grids is so that I can pass it to my Python CoProcess Catalyst pipeline. The number of grids can vary so I cannot simply hardcode the pipeline for a fixed number of grids.

If there is a way to make this work, please let me know!

Best,
Jimmy
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