Cycles viewport not showing certain material changes when using GPU compute (2.93) #85010

New Issue

Alaska · 2021-01-24T07:24:15+01:00

Alaska commented

2021-01-24 07:24:15 +01:00

System Information:
Operating system: Linux-5.10.0-1-amd64-x86_64-with-debian-bullseye 64 Bits
Graphics card: GeForce RTX 3070 460.32.03

Blender Version:
Broken: version: 2.93.0 ded9484925 2021-01-23 21:10
Worked: 2.91 release, Prior to 2.93.0 bbe6d44928 2021-01-22 15:08

Short description of error:
The Cycles viewport will not show a change a change in materials when a material is assigned to a new face when rendering with GPU compute (Tested CUDA and OptiX). CPU rendering does not appear to be affected.

Exact steps for others to reproduce the error:

In a new scene, change the render engine to Cycles and switch rendering method to GPU Compute
Change the 3D viewport to the Rendered viewport mode.
Select the cube and give it a second material slot
With the cube selected, enter edit mode.
Select a face on the cube and assign the second material slot to that face.
Make changes to the material in the second slot (E.G. Change the BSDF or change the colour, etc). These changes will not appear in the 3D viewport until you have exited and re-entered the Rendered viewport mode. This issue does not occur with CPU rendering based on my testing so far.

Here's a video demonstrating the issue:
#85010 - Missing viewport updates.mp4

**System Information:** Operating system: Linux-5.10.0-1-amd64-x86_64-with-debian-bullseye 64 Bits Graphics card: GeForce RTX 3070 460.32.03 **Blender Version:** Broken: version: 2.93.0 `ded9484925` 2021-01-23 21:10 Worked: 2.91 release, Prior to 2.93.0 `bbe6d44928` 2021-01-22 15:08 **Short description of error:** The Cycles viewport will not show a change a change in materials when a material is assigned to a new face when rendering with GPU compute (Tested CUDA and OptiX). CPU rendering does not appear to be affected. **Exact steps for others to reproduce the error:** 1. In a new scene, change the render engine to `Cycles` and switch rendering method to `GPU Compute` 2. Change the 3D viewport to the `Rendered` viewport mode. 3. Select the cube and give it a second material slot 4. With the cube selected, enter edit mode. 5. Select a face on the cube and assign the second material slot to that face. 6. Make changes to the material in the second slot (E.G. Change the BSDF or change the colour, etc). These changes will not appear in the 3D viewport until you have exited and re-entered the `Rendered` viewport mode. This issue does not occur with CPU rendering based on my testing so far. Here's a video demonstrating the issue: [#85010 - Missing viewport updates.mp4](https://archive.blender.org/developer/F9594999/T85010_-_Missing_viewport_updates.mp4)

Alaska commented

2021-01-24 07:24:15 +01:00

Added subscriber: @Alaska

Alaska commented

2021-01-24 07:25:16 +01:00

Added subscriber: @kevindietrich

Alaska commented

2021-01-24 07:25:16 +01:00

Bisecting points to bbe6d44928 as the cause. CC @kevindietrich

Bisecting points to bbe6d44928 as the cause. CC @kevindietrich

Kévin Dietrich self-assigned this 2021-01-24 10:57:04 +01:00

fwfeet commented

2021-01-24 20:11:55 +01:00

Added subscriber: @costa

fwfeet commented

2021-01-24 20:11:55 +01:00

With my experience this bug exists not only on rendering but also viewport shading. If I switch or add a matcap, ambient occlusion or whatever I won't see a change until I cycle through shadings.

Alaska commented

2021-01-24 21:40:27 +01:00

In #85010#1099667, @costa wrote:
With my experience this bug exists not only on rendering but also viewport shading. If I switch or add a matcap, ambient occlusion or whatever I won't see a change until I cycle through shadings.

I believe issue you describe is unrelated to the bug described in this task and thus probably won't be fixed when this bug is fixed. Please create a new task detailing the issue you're describing. However, I'm fairly sure I saw a similar report recently for the exact issue you're describing, I'm just having trouble finding it at the moment.

> In #85010#1099667, @costa wrote: > With my experience this bug exists not only on rendering but also viewport shading. If I switch or add a matcap, ambient occlusion or whatever I won't see a change until I cycle through shadings. I believe issue you describe is unrelated to the bug described in this task and thus probably won't be fixed when this bug is fixed. Please create a new task detailing the issue you're describing. However, I'm fairly sure I saw a similar report recently for the exact issue you're describing, I'm just having trouble finding it at the moment.

Roger B commented

2021-01-24 22:28:10 +01:00

Added subscriber: @rboxman

Roger B commented

2021-01-24 22:28:10 +01:00

In #85010#1099667, @costa wrote:
With my experience this bug exists not only on rendering but also viewport shading. If I switch or add a matcap, ambient occlusion or whatever I won't see a change until I cycle through shadings.

The viewport issue is noted here #84717 and has already been root caused to another checkin. It's a different issue.

> In #85010#1099667, @costa wrote: > With my experience this bug exists not only on rendering but also viewport shading. If I switch or add a matcap, ambient occlusion or whatever I won't see a change until I cycle through shadings. The viewport issue is noted here #84717 and has already been root caused to another checkin. It's a different issue.

blender-admin commented

2021-01-25 07:37:41 +01:00

This issue was referenced by 7a0281914e

This issue was referenced by 7a0281914ec94e6a495cc354844e91d88b8b18ae

Kévin Dietrich commented

2021-01-25 07:42:08 +01:00

Changed status from 'Needs Triage' to: 'Resolved'

Kévin Dietrich closed this issue

2021-01-25 07:42:08 +01:00

Alaska commented

2021-01-25 08:42:40 +01:00

Just confirming that testing with latest master shows this issues is fixed. Thank you @kevindietrich

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Cycles viewport not showing certain material changes when using GPU compute (2.93) #85010