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Physical sky is too dark on compatibility renderer #84441

@ParsleighScumble

Description

@ParsleighScumble

Godot version

4.1.1.stable

System information

Godot v4.1.1.stable - Ubuntu Core 22 - Vulkan (Compatibility) - llvmpipe (LLVM 15.0.7, 256 bits) - AMD Ryzen 7 2700X Eight-Core Processor (16 Threads) - Also works on Nvidia. All GLES3 on GL.

Issue description

Found this while shaving the gles3 fog yak. Physical sky seems dark especially compared to Vulkan. It doesn't seem to have to do with tonemapping. I'll fix this myself if I have time.

image

Steps to reproduce

Make a project with Compatibility renderer. Add WorldEnvironment. Set background mode to sky. Set sky material to PhysicalSkyMaterial. Sky should be dark like in the screenshot.

Minimal reproduction project

gles3-features-test.zip

Not exactly minimal but this should do the trick.

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