# Can't select presets in Volume Rendering

**URL:** <https://discourse.slicer.org/t/cant-select-presets-in-volume-rendering/31746>\
**Category:** Support\
**Tags:** segmentation, dicom, 3d-model, volume-rendering\
**Created:** [September 16, 2023, 6:41am UTC](https://discourse.slicer.org/t/cant-select-presets-in-volume-rendering/31746 "2023-09-16T06:41:28Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![radiodid](https://avatars.discourse-cdn.com/v4/letter/r/9e8a1a/32.png) [@radiodid](https://discourse.slicer.org/u/radiodid)\
**Post date:** [September 16, 2023, 6:41am UTC](https://discourse.slicer.org/t/cant-select-presets-in-volume-rendering/31746/1 "2023-09-16T06:41:28Z")

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I want to create a 3D reconstruction for CBCT, but Slicer won’t let me choose a preset if I’ve already created segmentation. But if I run only the NRRD file without segmentations, everything works fine.  
What is the cause of the problem and how can it be solved?

![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/e/ce0fa3efda5bc6bbec798de1b910be8c5e1965cb.png)

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**Author:** ![slicer365](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/slicer365/32/67549_2.png) [@slicer365](https://discourse.slicer.org/u/slicer365)\
**Post date:** [September 16, 2023, 3:56pm UTC](https://discourse.slicer.org/t/cant-select-presets-in-volume-rendering/31746/2 "2023-09-16T15:56:01Z")

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You should choose your Volume data first!

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/e/4/e47df6f93ecd5b7a06bffadf81edb81802f3fb30.jpeg)

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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:** [September 16, 2023, 7:24pm UTC](https://discourse.slicer.org/t/cant-select-presets-in-volume-rendering/31746/3 "2023-09-16T19:24:10Z")

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If you load an image as a segmentation then you don’t need volume rendering module to show it in 3D. That’s why the segmentation is not showing up in the Volume Rendering module. Instead, you can show a segmentation in 3D by going to the Segmentation module and clicking the “Show 3D” button.

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**Author:** ![radiodid](https://avatars.discourse-cdn.com/v4/letter/r/9e8a1a/32.png) [@radiodid](https://discourse.slicer.org/u/radiodid)\
**Post date:** [September 17, 2023, 5:14am UTC](https://discourse.slicer.org/t/cant-select-presets-in-volume-rendering/31746/4 "2023-09-17T05:14:49Z")

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> [@slicer365](#):
>
> You should choose your Volume data first!

I did that and it still doesn’t help

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<div class="post-metadata">

**Author:** ![radiodid](https://avatars.discourse-cdn.com/v4/letter/r/9e8a1a/32.png) [@radiodid](https://discourse.slicer.org/u/radiodid)\
**Post date:** [September 17, 2023, 5:24am UTC](https://discourse.slicer.org/t/cant-select-presets-in-volume-rendering/31746/5 "2023-09-17T05:24:39Z")

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> [@lassoan](#):
>
> If you load an image as a segmentation then you don’t need volume rendering module to show it in 3D. That’s why the segmentation is not showing up in the Volume Rendering module. Instead, you can show a segmentation in 3D by going to the Segmentation module and clicking the “Show 3D” button.

I run Slicer’s MRML file, which opens CT and segmentation. Also, I know that the segmentations can be seen in the usual 3D mode. However, I have never had a problem before when trying to create 3D reconstructions in Volume Rendering with such CTs.  
It doesn’t have much clinical significance for me, but I wonder what could be causing it.

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**Author:** ![chir.set](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/chir.set/32/66982_2.png) [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Post date:** [September 17, 2023, 11:03am UTC](https://discourse.slicer.org/t/cant-select-presets-in-volume-rendering/31746/6 "2023-09-17T11:03:47Z")

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Does it work with sample data?

It could be that your volume is too big for your GPU rendering capacities. Try to crop down your volume.

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**Author:** ![radiodid](https://avatars.discourse-cdn.com/v4/letter/r/9e8a1a/32.png) [@radiodid](https://discourse.slicer.org/u/radiodid)\
**Post date:** [September 17, 2023, 3:53pm UTC](https://discourse.slicer.org/t/cant-select-presets-in-volume-rendering/31746/7 "2023-09-17T15:53:16Z")

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> [@chir.set](#):
>
> It could be that your volume is too big for your GPU rendering capacities. Try to crop down your volume.

I`ve tried with other CTs of the same size and some of them work and some don’t. And there are also larger CTs that work without problems.

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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:** [September 17, 2023, 7:15pm UTC](https://discourse.slicer.org/t/cant-select-presets-in-volume-rendering/31746/8 "2023-09-17T19:15:25Z")

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If you can provide data and instructions that reproduce the issue then we can have a look.