[vtkusers] vtkMultiVolume and shading

[Csaba Pinter]

Hi Sankhesh,

Thanks for the quick answer! Just in a nutshell, what would be needed to do programming-wise to add shading in the code?

Also I’m wondering if the situation about funding applies to bugfixes as well? I am struggling with issues related to per-volume visibility and user transforms, and I think I’ll get back to you soon with self-contained test cases once I was able to figure out which of these are on the VTK side and how to reproduce them easily.

Thanks,
csaba

From: Sankhesh Jhaveri <sankhesh.jhaveri at kitware.com>
Sent: Monday, April 23, 2018 21:15
To: Csaba Pinter <csaba.pinter at queensu.ca>
Cc: vtkusers at vtk.org
Subject: Re: [vtkusers] vtkMultiVolume and shading


Hi Csaba,

I don’t believe there is a technical limitation. It was merely that the original effort for adding multiple overlapping volumes support was focused on selected features. I am not aware of current efforts/funding to add support for additional features like shading, different blend modes, etc.

Thanks,
Sankhesh
​

On Mon, Apr 23, 2018 at 3:45 PM Csaba Pinter <csaba.pinter at queensu.ca<mailto:csaba.pinter at queensu.ca>> wrote:
Hello,

I’m experimenting with using vtkMultiVolume to add proper multi-volume rendering support into 3D Slicer. My main question is the reason behind this actor not supporting shading, as apparent when used, but also mentioned in the corresponding test:
https://github.com/Kitware/VTK/blob/master/Rendering/Volume/Testing/Cxx/TestGPURayCastMultiVolumeOverlapping.cxx#L229<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FKitware%2FVTK%2Fblob%2Fmaster%2FRendering%2FVolume%2FTesting%2FCxx%2FTestGPURayCastMultiVolumeOverlapping.cxx%23L229&data=02%7C01%7Ccsaba.pinter%40queensu.ca%7C8a6428523d3447bb73a508d5a980de7d%7Cd61ecb3b38b142d582c4efb2838b925c%7C1%7C0%7C636601293328785436&sdata=BzBxWsRJBeTCZlDe0GkyvNWx5hCLc1XrO84qbwXEOcQ%3D&reserved=0>
Is this a technical limitation that would be very hard to overcome, or is it something simpler? I’m asking this because for this actor to be really used for volume rendering, shading would be necessary.

Thank you,
Csaba
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Sankhesh Jhaveri
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