How to render multiBlock Image data by Volume representation

Development
1

Dear Experts,

i found when i put several vtkImageData into vtkMultiBlockDataSet, i cannot select “Volume” representation.

It seems the output data type is “vtkMultiBlockDataSet” not “vtkImageData”, so in the paraview representation GUI, there is no “Volume” option to choose…?

How can i make such multi block image data to be rendered by volume representation?

Thanks and Best Regards,
Sharon

2

Alas, volume rendering of any multiblock data is not well supported. As a not terribly efficient workaround, you can use a Resample to Image filter to enable volume rendering. It is definitely not ideal, but works in a pinch.

3

Cory, would another option be the Merge Blocks filter?

4

Merge Blocks would enable volume rendering, but it would greatly expand the memory footprint because all grids would be converted to unstructured grids. If you start with a multiblock of unstructured grids, then that’s not a big deal, but coming from image data it is a bigger deal.

5

You are correct, of course. I keep forgetting that multiblock data can be non unstructured grid.

6

@cory.quammen @wascott

Thank you Cory and Waltter very much!!
Your information is very helpful for me!

Best Regards