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unity_FogParams.y is never used in URP, considering unity_FogParams.y is useful for FOG_EXP mode

Package: Scriptable Render Pipeline Universal


Reproduction steps:
1. Open user's attached project
2. In the Project Window find and open "ShaderVariablesFunctions.hlsl" (Packages/com.unity.render-pipelines.universal/ShaderLibrary/ShaderVariablesFunctions.hlsl)
3. Go to "ComputeFogFactor" function

Expected result: "ComputeFogFactor" function uses unity_FogParams.y
Actual result: "ComputeFogFactor" function doesn't use unity_FogParams.y

Reproducible with: 10.9.0 (2020.3.34f1), 12.1.6 (2021.3.2f1), 13.1.8 (2022.1.0f1), 14.0.2 (2022.2.0a12)

Could not test with: 7.7.1 (2019.4.38f1) - URP doesn't have "ShaderVariablesFunctions.hlsl" file

  1. Resolution Note:

    We decided to not support this fog mode, so this is by design.

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