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Fixed in 2020.2.X
Fixed in 2018.4.X, 2019.3.X, 2020.1.X
Surface shader Emission usage does not get detected when set with a specific expression using WorldNormalVector
Setting surface shader emission to a specific expression of "WorldNormalVector(Input, float3(0, 0, 1)).y" causes emission to not be used at all.
How to reproduce:
1. Open scene "EmissionChannelIssue" from the attached project
2. Inspect the sphere in Scene or Game view
Expected result: Sphere has white gradient from the middle to the top
Actual result: Sphere is completely black
Reproducible with: 2018.4.17f1, 2019.3.2f1, 2020.1.0a23
Not reproducible with: 2017.4.37f1
Workaround: set a non-zero value to shader emission. Can be done at analysis stage without affecting output by using "#if defined(SHADER_TARGET_SURFACE_ANALYSIS)"
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Resolution Note (fix version 2020.2):
Fixed in: 2020.2.0a1