# Volume Rendering not working

**URL:** <https://discourse.slicer.org/t/volume-rendering-not-working/4018>\
**Category:** Support\
**Created:** [September 7, 2018, 2:26pm UTC](https://discourse.slicer.org/t/volume-rendering-not-working/4018 "2018-09-07T14:26:40Z")\
**Posts on this page:** 3\
**Page:** 2

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**Author:** ![Tommaso\_Di\_Noto](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tommaso_di_noto/32/6802_2.png) [@Tommaso\_Di\_Noto](https://discourse.slicer.org/u/Tommaso_Di_Noto)\
**Post date:** [November 28, 2019, 10:29am UTC](https://discourse.slicer.org/t/volume-rendering-not-working/4018/21 "2019-11-28T10:29:05Z")

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Hi @cpinter!  
Are there any updates on the multi-volume rendering shading? 🙂

Thanks in advance

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [November 28, 2019, 2:16pm UTC](https://discourse.slicer.org/t/volume-rendering-not-working/4018/22 "2019-11-28T14:16:22Z")

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He managed to fix some of the issues but not all of them (some stability issues remain unresolved).

@cpinter it would be great if you could post the link to your WIP branch, just in case someone at Kitware or elsewhere would find time to continue.

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [November 29, 2019, 4:42pm UTC](https://discourse.slicer.org/t/volume-rendering-not-working/4018/23 "2019-11-29T16:42:35Z")

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This is my branch:

> **[cpinter/VTK](https://github.com/cpinter/VTK/tree/multi-volume-shading)**
>
> WARNING: This is NOT the official upstream VTK git repository - cpinter/VTK

Shading with multi-volume rendering works with this branch, however, not every time! Unfortunately about 2/3 of the time there is no shading at all (looks black, as if lighting is not considered whatsoever), but when it shows up, then it looks as it’s supposed to. I haven’t been able to figure out the reason for this undeterministic behavior. Any suggestions are welcome, and I’m happy to answer any questions.

[Previous page](https://discourse.slicer.org/t/volume-rendering-not-working/4018.md?page=1)