HDRI background shows lighting artefacts at zero strength #86365

New Issue

Karja Krähwald · 2021-03-07T18:29:17+01:00

Karja Krähwald commented

2021-03-07 18:29:17 +01:00

System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40

Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: 02948a2cab

Short description of error
Dont know if this is a Blender issue, but I encountered a few HDRI files that still show light sources despite having zero strength in the viewport shading studiolight setting:

The HDRI file is:
blue_lagoon_night_2k.hdr

The lighting comes from remaining artefacts at the spot of the lamp. Its more noticable with a bit of blur, but you can still see it without.
Since this is only an issue for some HDRI Backgrounds I assume it has to do with those files, I dont know. Regardless, it would be nice if Blender could take care of these cases to guarantee a dark background.

Exact steps for others to reproduce the error
HDRIBackgroundStrengthBug.blend

Install the attached HDRI File and set it as background.
Change the strength setting for the Viewport Shading to zero.
Problem:
The background lightens the scene at zero strength with the remaining artefacts.

**System Information** Operating system: Windows-7-6.1.7601-SP1 64 Bits Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40 **Blender Version** Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: `02948a2cab` **Short description of error** Dont know if this is a Blender issue, but I encountered a few HDRI files that still show light sources despite having zero strength in the viewport shading studiolight setting: ![HDRIBackgroundStrengthBug.jpg](https://archive.blender.org/developer/F9877518/HDRIBackgroundStrengthBug.jpg) The HDRI file is: [blue_lagoon_night_2k.hdr](https://archive.blender.org/developer/F9877521/blue_lagoon_night_2k.hdr) The lighting comes from remaining artefacts at the spot of the lamp. Its more noticable with a bit of blur, but you can still see it without. Since this is only an issue for some HDRI Backgrounds I assume it has to do with those files, I dont know. Regardless, it would be nice if Blender could take care of these cases to guarantee a dark background. **Exact steps for others to reproduce the error** [HDRIBackgroundStrengthBug.blend](https://archive.blender.org/developer/F9877532/HDRIBackgroundStrengthBug.blend) 1. Install the attached HDRI File and set it as background. 2. Change the strength setting for the Viewport Shading to zero. Problem: The background lightens the scene at zero strength with the remaining artefacts.

Karja Krähwald commented

2021-03-07 18:29:17 +01:00

Added subscriber: @karja

I did must have done it commented

2021-03-07 21:04:44 +01:00

Added subscriber: @leonardos

I did must have done it commented

2021-03-07 21:04:44 +01:00

cant reproduce windows 10 rx 6800

cant reproduce windows 10 rx 6800 ![zzzzzzzzzz.png](https://archive.blender.org/developer/F9877806/zzzzzzzzzz.png)

Philipp Oeser commented

2021-03-08 17:52:22 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-03-08 17:52:22 +01:00

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

Philipp Oeser commented

2021-03-08 17:52:22 +01:00

Can confirm

**System Information**
Operating system: Linux-5.10.19-200.fc33.x86_64-x86_64-with-glibc2.32 64 Bits
Graphics card: GeForce GTX 970M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 455.45.01
version: 2.93.0 Alpha, branch: master (modified), commit date: 2021-03-08 15:50, hash: `rB9cb5f0a2282a`

with StudioLights

Same thing does not happen when used in a world shader

Can confirm ``` **System Information** Operating system: Linux-5.10.19-200.fc33.x86_64-x86_64-with-glibc2.32 64 Bits Graphics card: GeForce GTX 970M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 455.45.01 version: 2.93.0 Alpha, branch: master (modified), commit date: 2021-03-08 15:50, hash: `rB9cb5f0a2282a` ``` with StudioLights ![image.png](https://archive.blender.org/developer/F9879632/image.png) Same thing does not happen when used in a world shader ![image.png](https://archive.blender.org/developer/F9879634/image.png)

Philipp Oeser removed the

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HDRI background shows lighting artefacts at zero strength #86365