Special Values from SurfaceOutput Struct are stripped when using them in the #if UNITY_PASS_FORWARDBASE directive

Unity: Shader System

As Designed

6.0.X

2022.3.X

2021.3.X

Pass type defines are not present in the phase that analyses the surface shader code. You can use SHADER_TARGET_SURFACE_ANALYSIS: #if SHADER_TARGET_SURFACE_ANALYSIS || UNITY_PASS_FORWARDADD ... #endif

How to reproduce:
1. Open the user-attached project “SurfaceShaderBug”
2. Open the “SampleScene” scene
3. Observe the “Cube” GameObejct in the Scene View

Expected results: The “Cube” is black
Actual results: The “Cube” is red

Reproducible with: 2021.3.38f1, 2022.3.30f1, 6000.0.3f1

Reproducible on: Windows 11 Pro
Not reproducible on: No other environment tested

Note: Also reproducible in Player

Workaround:
Using #ifndef UNITY_PASS_FORWARDADD instead solves the issue

Special Values from SurfaceOutput Struct are stripped when using them in the #if UNITY_PASS_FORWARDBASE directive

Unity: Shader System

As Designed

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Have a workaround or additional info about this issue?

Special Values from SurfaceOutput Struct are stripped when using them in the #if UNITY_PASS_FORWARDBASE directive

Unity: Shader System

Statuses

As Designed

Resolution Notes

6.0.XAs DesignedPass type defines are not present in the phase that analyses the surface shader code. You can use SHADER_TARGET_SURFACE_ANALYSIS: #if SHADER_TARGET_SURFACE_ANALYSIS || UNITY_PASS_FORWARDADD ... #endif

Description

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Have a workaround or additional info about this issue?