Cycles-X: adjusting viewport render settings in a certain order can result in the viewport turning dark #91426

New Issue

Alaska · 2021-09-15T09:12:30+02:00

Alaska commented

2021-09-15 09:12:30 +02:00

System Information
Operating system: Linux-5.10.0-8-amd64-x86_64-with-glibc2.31 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 470.63.01

Blender Version
Broken: version: 3.0.0 Alpha, branch: cycles-x, commit date: 2021-09-14 15:01, hash: 58ab616d4c
Worked: Prior to Cycles-X

Short description of error
Adjusting certain Cycles viewport render settings in a certain order can result with the viewport getting darker as rendering progresses. A video can be found below:
2021-09-15 18-31-26.mp4

Exact steps for others to reproduce the error

Change the sample count for the viewport to something low (1) and change the start sample count for viewport denoising to something low (1) and enable viewport denoising.
Enter the rendered viewport.
Change the start sample count for viewport denoising to something really high (10000).
Now change the viewport sample count to something high as well (0 for unlimited works). Notice how the viewport gets darker until your refresh it or the sample count reaches a point where denoising takes place.

Note: Turning off adaptive sampling might help in reproducing this report.

**System Information** Operating system: Linux-5.10.0-8-amd64-x86_64-with-glibc2.31 64 Bits Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 470.63.01 **Blender Version** Broken: version: 3.0.0 Alpha, branch: cycles-x, commit date: 2021-09-14 15:01, hash: `58ab616d4c` Worked: Prior to Cycles-X **Short description of error** Adjusting certain Cycles viewport render settings in a certain order can result with the viewport getting darker as rendering progresses. A video can be found below: [2021-09-15 18-31-26.mp4](https://archive.blender.org/developer/F10418724/2021-09-15_18-31-26.mp4) **Exact steps for others to reproduce the error** 1. Change the sample count for the viewport to something low (1) and change the start sample count for viewport denoising to something low (1) and enable viewport denoising. 2. Enter the rendered viewport. 3. Change the start sample count for viewport denoising to something really high (10000). 4. Now change the viewport sample count to something high as well (0 for unlimited works). Notice how the viewport gets darker until your refresh it or the sample count reaches a point where denoising takes place. Note: Turning off adaptive sampling might help in reproducing this report.

Alaska commented

2021-09-15 09:12:30 +02:00

Added subscriber: @Alaska