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

New Issue

Test-Adre · 2023-03-30T08:17:57+02:00

Test-Adre commented

2023-03-30 08:17:57 +02:00

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.png

134 KiB

two_suns_3_4_vs_3_5.blend

900 KiB

two_suns_3_5.png

192 KiB

Test-Adre added the

labels 2023-03-30 08:17:58 +02:00

Alaska commented

2023-03-30 12:03:30 +02:00

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 added

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High

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