Shaders created with Shader Graph generate a large amount of shader variants and cause slow build times when using a baked lightmap in BIRP

Unity: Shader System

Won't Fix

6.6.X

6.5.X

6.4.X

6.3.X

6.2.X

6.1.X

6.0.X

2022.3.X

2021.3.X

Thank you for reporting a bug to Unity. We have reviewed the issue carefully, and in this case, the team is unable to prioritize fixing this bug. There are a number of reasons we make this decision, including the impact and severity of the issue across our user and customer base, and the possibility that future plans may solve the problem in a different way, or that a workaround for the bug may be available. Today we will be closing this case. Thank you again for taking the time to report this issue, and please let us know if there is anything else that changes the impact or severity of this issue.

Unity 6000.2 has reached its end of life and will not receive further updates. If you need additional fixes, please upgrade to a newer Unity version.

Cancelling: the 6000.1 version has reached its end of life. If you need additional fixes, please upgrade to a newer Unity version.

Unity 2021.3 has reached its end of life and will not receive further updates. If you need additional fixes, please upgrade to a newer Unity version.

How to reproduce:
1. Open the attached “shader_variants_birp” project
2. Open the Build Settings (File → Build Settings…) and ensure that “Development Build” is selected
3. Press “Build”
4. Take note of the build time
5. Observe the result in the Console window

Expected result: The build takes a short time to complete (less than a minute) and few shader variants are generated
Actual result: The build takes a long time to complete (several minutes) and a large amount of shader variants are generated (30 000 - 60 000)

Reproducible in: 2021.3.39f1, 2022.3.31f1, 6000.0.4f1

Reproducible on: Windows 11
Not reproducible on: No other environments tested

Notes:

Not reproducible in URP/HDRP
The number of generated shader variants depends on the selected graphics API
- Direct3D11 - 50583
- Direct3D12 - 50583
- Vulkan - 33435
- OpenGLES3 - 32975

Shaders created with Shader Graph generate a large amount of shader variants and cause slow build times when using a baked lightmap in BIRP

Unity: Shader System

Won't Fix

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Have a workaround or additional info about this issue?

Shaders created with Shader Graph generate a large amount of shader variants and cause slow build times when using a baked lightmap in BIRP

Unity: Shader System

Statuses

Won't Fix

Resolution Notes

6.2.XWon't FixUnity 6000.2 has reached its end of life and will not receive further updates. If you need additional fixes, please upgrade to a newer Unity version.

6.1.XWon't FixCancelling: the 6000.1 version has reached its end of life. If you need additional fixes, please upgrade to a newer Unity version.

2021.3.XWon't FixUnity 2021.3 has reached its end of life and will not receive further updates. If you need additional fixes, please upgrade to a newer Unity version.

Description

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