Volume cube won't render in Cycles #106776

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opened 2023-04-10 22:40:39 +02:00 by Gurra · 5 comments

Gurra commented

2023-04-10 22:40:39 +02:00

System Information
Operating system: Windows 10
Graphics card: Nvidia RTX3090

Blender Version
Broken: 3.3, 3.6
Worked: (don't know)

Short description of error
I've made a simple volume cube and attached a material to it, and as you can see on the screenshot it's there in the regular viewport, but as soon as I switch to rendered viewport it doesn't show. In Cycles that is, it's working as intended in Eevee. If I also add a 'volume to mesh' and then a 'mesh to volume' it shows up. I've tried with both a regular geometry object as a base for the geo node modifier and also a volume object but both refuses to render as they should.

Exact steps for others to reproduce the error
Open the attached .blend file and try it.
I also added those extra two nodes in there for you to see how it works with those enabled.

Open default scene
Add volume cube do default GN tree
Switch to viewport rendering (check results with both engines)

**System Information** Operating system: Windows 10 Graphics card: Nvidia RTX3090 **Blender Version** Broken: 3.3, 3.6 Worked: (don't know) **Short description of error** I've made a simple volume cube and attached a material to it, and as you can see on the screenshot it's there in the regular viewport, but as soon as I switch to rendered viewport it doesn't show. In Cycles that is, it's working as intended in Eevee. If I also add a 'volume to mesh' and then a 'mesh to volume' it shows up. I've tried with both a regular geometry object as a base for the geo node modifier and also a volume object but both refuses to render as they should. **Exact steps for others to reproduce the error** Open the attached .blend file and try it. I also added those extra two nodes in there for you to see how it works with those enabled. - - - - Open default scene - Add volume cube do default GN tree - Switch to viewport rendering (check results with both engines) ![](https://i.imgur.com/sChLj1B.png) ![](https://i.imgur.com/poKasRu.png)

volcubebug.blend

8.0 MiB

Gurra added the

labels 2023-04-10 22:40:39 +02:00

Pratik Borhade commented

2023-04-12 08:00:27 +02:00

Member

Thanks for the report. I can confirm.

Thanks for the report. I can confirm.

Pratik Borhade added

Render & Cycles

and removed

labels 2023-04-12 08:00:38 +02:00

Iliya Katushenock added the

Nodes & Physics

labels 2023-04-12 13:41:07 +02:00

Erik Abrahamsson commented

2023-04-12 14:21:59 +02:00

Member

If you scroll the X-resolution while in render mode the cube shows up but seems to disappear on some even values (on multiples of 8?).

If you scroll the X-resolution while in render mode the cube shows up but seems to disappear on some even values (on multiples of 8?).

Gurra commented

2023-04-12 20:30:52 +02:00

Author

Yup dragging any of the resolution sliders seems to make it appear. And I'm not sure if it's intended, but lowering it increases it's size, and upping it gives it a slightly funky outline.

Yup dragging any of the resolution sliders seems to make it appear. And I'm not sure if it's intended, but lowering it increases it's size, and upping it gives it a slightly funky outline. ![](https://i.imgur.com/bEgfhj7.png) ![](https://i.imgur.com/3277tM8.png)

Erik Abrahamsson commented

2023-04-28 02:05:55 +02:00

Member

I experimented a bit more with this and noticed that when the input density is not a constant float value, for example noise is added, it works fine.

I experimented a bit more with this and noticed that when the input density is not a constant float value, for example noise is added, it works fine. ![bild](/attachments/a26c9e7f-bc63-48ee-900e-e31b6efdfd55)

138 KiB

Erik Abrahamsson commented

2023-05-02 14:37:51 +02:00

Member

It seems like the problem here is that no leaf nodes are created in the volume grid when the Density is constant, which tricks Cycles into thinking the grid is empty.. Will submit a PR with a propsed fix.

It seems like the problem here is that no leaf nodes are created in the volume grid when the Density is constant, which tricks Cycles into thinking the grid is empty.. Will submit a PR with a propsed fix.

Erik Abrahamsson referenced a pull request that will close this issue

2023-05-02 17:41:01 +02:00

Fix #106776: Volume cube won't render in Cycles #107551

Erik Abrahamsson referenced this issue from a commit

2023-05-02 20:14:04 +02:00

Fix #106776: Volume cube won't render in Cycles

Erik Abrahamsson closed this issue

2023-05-02 20:14:06 +02:00

Blender Bot added

and removed

labels 2023-05-02 20:14:07 +02:00

Brecht Van Lommel referenced this issue

2023-05-02 20:41:13 +02:00

Blender LTS: Maintenance Task 3.3 #100749

Philipp Oeser referenced this issue from a commit

2023-05-15 14:56:48 +02:00

Fix #106776: Volume cube won't render in Cycles

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