# substrate materials wont let me bake gi

**URL:** <https://forums.unrealengine.com/t/substrate-materials-wont-let-me-bake-gi/2683091>\
**Category:** Rendering\
**Tags:** unreal-engine, question\
**Created:** [December 8, 2025, 1:51pm UTC](https://forums.unrealengine.com/t/substrate-materials-wont-let-me-bake-gi/2683091 "2025-12-08T13:51:11Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Arkiras](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/arkiras/32/1008648_2.png) [@Arkiras](https://forums.unrealengine.com/u/Arkiras)\
**Post date:** [December 8, 2025, 1:57pm UTC](https://forums.unrealengine.com/t/substrate-materials-wont-let-me-bake-gi/2683091/2 "2025-12-08T13:57:41Z")

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probably this

> [@Substrate - Feedback Thread](https://forums.unrealengine.com/t/substrate-feedback-thread/691314/727):
>
> CPU lightmass baking was working at some point that is sure. I have not checked 5.7 but it is broken in 5.8 indeed you are correct. Adding it to the list. Thanks for reporting.

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