When world color is black, white objects under white lights are rendered as black #84547

New Issue

John Atkeson · 2021-01-09T15:41:30+01:00

John Atkeson commented

2021-01-09 15:41:30 +01:00

System Information
Operating system: Linux-4.15.0-130-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: AMD TURKS (DRM 2.50.0 / 4.15.0-130-generic, LLVM 10.0.0) X.Org 3.3 (Core Profile) Mesa 20.0.8

Blender Version
Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: 0f45cab862
Worked: Blender 2.79 (possibly newer, these 2 versions are all I have).

Short description of error
When world color is black, white objects under white lights are rendered as black.

Exact steps for others to reproduce the error

Open Blender 2.91 with default cube, light and camera.
Go to World Properties tab, change Surface color of world to black.
Press F12.
The cube will be rendered totally black, even though it is a pale material with a light on it. This is not how lighting works, black does not project onto surfaces and override light.

Repeating these steps in Blender 2.79 produces correct results, rendering a visible pale cube.

**System Information** Operating system: Linux-4.15.0-130-generic-x86_64-with-debian-buster-sid 64 Bits Graphics card: AMD TURKS (DRM 2.50.0 / 4.15.0-130-generic, LLVM 10.0.0) X.Org 3.3 (Core Profile) Mesa 20.0.8 **Blender Version** Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: `0f45cab862` Worked: Blender 2.79 (possibly newer, these 2 versions are all I have). **Short description of error** When world color is black, white objects under white lights are rendered as black. **Exact steps for others to reproduce the error** 1. Open Blender 2.91 with default cube, light and camera. 2. Go to World Properties tab, change Surface color of world to black. 3. Press F12. 4. The cube will be rendered totally black, even though it is a pale material with a light on it. This is not how lighting works, black does not project onto surfaces and override light. Repeating these steps in Blender 2.79 produces correct results, rendering a visible pale cube.

John Atkeson commented

2021-01-09 15:41:30 +01:00

Added subscriber: @MultiTool

EchoDot commented

2021-01-09 16:12:48 +01:00

Added subscriber: @EchoDot

EchoDot commented

2021-01-09 16:12:48 +01:00

Rendering correctly(as it should) on windows in 2.91 and 2.92 Alpha(both cycles and eevee)

Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Intel(R) UHD Graphics Intel 4.5.0 - Build 26.20.100.7323

Rendering correctly(as it should) on windows in 2.91 and 2.92 Alpha(both cycles and eevee) Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: Intel(R) UHD Graphics Intel 4.5.0 - Build 26.20.100.7323

John Atkeson commented

2021-01-09 17:25:09 +01:00

Following Saran's example I just tried on Windows now too and the cube renders correctly there.

So this is definitely a bug on the Linux version, because I am the same user and get different results on the different platforms.

Following Saran's example I just tried on Windows now too and the cube renders correctly there. So this is definitely a bug on the Linux version, because I am the same user and get different results on the different platforms.

Alaska commented

2021-01-10 05:11:25 +01:00

Added subscriber: @Alaska

Alaska commented

2021-01-10 05:11:25 +01:00

According to this site , the AMD turks GPU is a Terrascale 2 GPU and is thus not officially supported in Blender and as a result bugs like this can occur. See the list of supported hardware here: https:*www.blender.org/download/requirements/

Installing the latest graphics driver sometimes helps to make such GPUs work, see here for more information. https://docs.blender.org/manual/en/dev/troubleshooting/gpu/index.html

If that doesn't help, you can use older versions of Blender like 2.79: https://www.blender.org/download/previous-versions/

According to [this site ](https:*www.techpowerup.com/gpu-specs/amd-turks.g92), the AMD turks GPU is a Terrascale 2 GPU and is thus not officially supported in Blender and as a result bugs like this can occur. See the list of supported hardware here: https:*www.blender.org/download/requirements/ Installing the latest graphics driver sometimes helps to make such GPUs work, see here for more information. https://docs.blender.org/manual/en/dev/troubleshooting/gpu/index.html If that doesn't help, you can use older versions of Blender like 2.79: https://www.blender.org/download/previous-versions/

John Atkeson commented

2021-01-10 11:41:05 +01:00

Thanks, Alaska.

Blender uses GPU for its screen display, but does it use GPU to render PNG files? Because that's where the problem happens.

Thanks, Alaska. Blender uses GPU for its screen display, but does it use GPU to render PNG files? Because that's where the problem happens.

Alaska commented

2021-01-10 22:35:22 +01:00

If you're using EEVEE, then yes, it uses the GPU to render images like PNG files. If you're using Cycles, you will need to explicitly tell it to use the GPU.

Falk David commented

2021-01-11 12:46:54 +01:00

Added subscriber: @filedescriptor

Falk David commented

2021-01-11 12:46:54 +01:00

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

Falk David closed this issue

2021-01-11 12:46:54 +01:00

Falk David commented

2021-01-11 12:46:54 +01:00

I cannot reproduce this and the GPU is indeed not officially supported. I will close this for now.

John Atkeson commented

2021-01-11 13:08:44 +01:00

Alaska's suggestion of switching to cycles worked, proving it is only a problem when using the GPU.

Now I have a satisfactory workaround and can proceed.

I hope Blender keeps its software rendering option forever. GPUs are fast but not standard across all machines so not always reliable.

Alaska's suggestion of switching to cycles worked, proving it is only a problem when using the GPU. Now I have a satisfactory workaround and can proceed. I hope Blender keeps its software rendering option forever. GPUs are fast but not standard across all machines so not always reliable.

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When world color is black, white objects under white lights are rendered as black #84547