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Eevee-next negative lights don't influence background light #127313

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opened 2024-09-08 16:18:32 +02:00 by Vik · 3 comments
Vik commented 2024-09-08 16:18:32 +02:00
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Operating system: Linux-6.8.0-41-generic-x86_64-with-glibc2.39
Graphics card: Intel Arc A770 16GB

Broken: 4.2, 4.3
Worked: 4.1

With Eevee-next, lamps with negative strength do not affect light cast by the world shader.
negative_light.blend

Images below - Cycles, Eevee-next, Eevee respectively.

Operating system: Linux-6.8.0-41-generic-x86_64-with-glibc2.39 Graphics card: Intel Arc A770 16GB Broken: 4.2, 4.3 Worked: 4.1 With Eevee-next, lamps with negative strength do not affect light cast by the world shader. [negative_light.blend](/attachments/41c12bae-2176-4308-9a56-28d8f4415f1c) Images below - Cycles, Eevee-next, Eevee respectively.
neg2.png
1.2 MiB
neg1.png
1.2 MiB
neg3.png
1.1 MiB
system-info.txt
17 KiB
negative_light.blend
100 KiB
neg2.png neg1.png neg3.png
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Alaska commented 2024-09-09 04:57:57 +02:00
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This issue only occurs when the material uses the Dithered rendering method (which is the default in EEVEE Next). However in 4.1.1 Dithered materials didn't have this issue.

Either way, I can confirm the issue, and it's technically a regression so I'm making it high severity. Developers are free to lower the severity.

System Information
Operating system: macOS-14.6.1-arm64-arm-64bit 64 Bits
Graphics card: Metal API Apple M1 Pro 1.2
Blender version: 4.3.0 Alpha, branch: main, commit date: 2024-09-07 14:04, hash: 8283bf37a2b8

This issue only occurs when the material uses the `Dithered` rendering method (which is the default in EEVEE Next). However in 4.1.1 Dithered materials didn't have this issue. Either way, I can confirm the issue, and it's technically a regression so I'm making it high severity. Developers are free to lower the severity. **System Information** Operating system: macOS-14.6.1-arm64-arm-64bit 64 Bits Graphics card: Metal API Apple M1 Pro 1.2 Blender version: 4.3.0 Alpha, branch: main, commit date: 2024-09-07 14:04, hash: `8283bf37a2b8`
Alaska changed title from Eevee-next negative lights are broken to Eevee-next negative lights don't influence background light 2024-09-09 05:18:46 +02:00
Miguel Pozo commented 2024-09-09 12:50:55 +02:00
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I think the issue here is that deferred lighting information is stored as rgb9e5, which doesn't store a sign bit.
I guess this is by design, @fclem?

I think the issue here is that deferred lighting information is stored as `rgb9e5`, which doesn't store a sign bit. I guess this is by design, @fclem?
Clément Foucault commented 2024-09-09 12:58:38 +02:00
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It is by design. But we could add the option change it to 16bit floats (for accuracy and supporting negative lights).

However, this would add quite some complexity and I will not consider this an urgent feature. So I will add it to the feature request of #123505.

It is by design. But we could add the option change it to 16bit floats (for accuracy and supporting negative lights). However, this would add quite some complexity and I will not consider this an urgent feature. So I will add it to the feature request of #123505.
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