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Regression: World setup with two sky textures is lacking proper direct light sampling on the suns - 3.5+ #106293

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opened 2023-03-30 08:17:57 +02:00 by Test-Adre · 2 comments
Test-Adre commented 2023-03-30 08:17:57 +02:00
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System Information
Operating system: Windows 11
Graphics card: NVIDIA GeForce RTX 3060 Laptop GPU/PCIe/SSE2

Blender Version
Broken: (version: 3.5.0, branch: blender-v3.5-release, commit date: 2023-03-29 02:56, hash: 1be25cfff1, type: release)

Worked: (3.4.1)

Mixing two sky textures with two suns works differently in 3.4 and 3.5. Please see the attached files: BLEND and two render files showing the difference.

Exact steps for others to reproduce the error
Open the attached BLEND file in 3.4.1 and render. Then do the same in 3.5.

**System Information** Operating system: Windows 11 Graphics card: NVIDIA GeForce RTX 3060 Laptop GPU/PCIe/SSE2 **Blender Version** Broken: (version: 3.5.0, branch: blender-v3.5-release, commit date: 2023-03-29 02:56, hash: 1be25cfff18b, type: release) Worked: (3.4.1) **Mixing two sky textures with two suns works differently in 3.4 and 3.5. Please see the attached files: BLEND and two render files showing the difference.** **Exact steps for others to reproduce the error** Open the attached BLEND file in 3.4.1 and render. Then do the same in 3.5.
two_suns_3_4_vs_3_5.blend
900 KiB
two_suns_3_5.png
192 KiB
two_suns_3_4.png
134 KiB
two_suns_3_5.png two_suns_3_4.png
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 labels 2023-03-30 08:17:58 +02:00
Alaska commented 2023-03-30 12:03:30 +02:00
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The main difference is the noise. In Blender 3.5, this multi sky texture setup has much more noise (due to lack of proper direct light sampling for both suns). And this leads to other issues with the adaptive sampling.

It should also be noted that the user isn't using the new Light Tree. And enabling it doesn't fix this issue either.

Quick testing reveals the issue is related to the modifications made to the sky texture by Jeffery Liu in 05bdef7ce6

Since Jeffery seems to in-active, I am tagging @brecht and @weizhen to look into this issue if possible.

The main difference is the noise. In Blender 3.5, this multi sky texture setup has much more noise (due to lack of proper direct light sampling for both suns). And this leads to other issues with the adaptive sampling. It should also be noted that the user isn't using the new Light Tree. And enabling it doesn't fix this issue either. Quick testing reveals the issue is related to the modifications made to the sky texture by Jeffery Liu in 05bdef7ce64fe3125b95d72d80f1f4f60c2b127 Since Jeffery seems to in-active, I am tagging @brecht and @weizhen to look into this issue if possible.
Alaska changed title from World setup with two sky textures and two suns produces different results in 3.4.1 and 3.5 to Regression: World setup with two sky textures is lacking proper direct light sampling on the suns - 3.5+ 2023-03-30 12:04:40 +02:00
Brecht Van Lommel added
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 labels 2023-03-31 16:31:02 +02:00
Brecht Van Lommel commented 2023-04-03 18:37:56 +02:00
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What happened is that we removed the sun from the importance map, since the dedicated sun importance sampling is supposed to be better at it and doing both is worse. The issue is that the dedicated sampling doesn't support multiple suns.

What happened is that we removed the sun from the importance map, since the dedicated sun importance sampling is supposed to be better at it and doing both is worse. The issue is that the dedicated sampling doesn't support multiple suns.
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