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Maniphest T86365

HDRI background shows lighting artefacts at zero strength
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Description

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: rB02948a2cab44

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.hdr6 MBDownload

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.blend632 KBDownload

  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.

Event Timeline

Karja Krähwald (karja) created this task.Mar 7 2021, 6:29 PM
I did must have done it (leonardos) added a subscriber: I did must have done it (leonardos).Mar 7 2021, 9:04 PM

cant reproduce windows 10 rx 6800

Philipp Oeser (lichtwerk) changed the task status from Needs Triage to Confirmed.Mar 8 2021, 5:52 PM
Philipp Oeser (lichtwerk) added a project: EEVEE & Viewport.
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).

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