[vtkusers] vtkMultiVolume and shading

[Sankhesh Jhaveri]

Hi Csaba,

Programming wise, the missing component is support for calculating
gradients across different volumes in the shader composer.

Please feel free to report bugs on VTK’s issue tracker. If it is a
relatively simple thing, we can fix it quickly.

Thanks,
Sankhesh
​

On Tue, Apr 24, 2018 at 9:15 AM Csaba Pinter <csaba.pinter at queensu.ca>
wrote:

> 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>
> 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
> *Sr. Research & Development Engineer* | Kitware
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> ​
>
-- 
Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
<http://www.kitware.com/> | (518) 881-4417
​
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