Here is a summary of the usage for SUBSTRATE_TOON found in the ue5-main branch.
All analysis and testing were done using Antigravity Opus 4.5.
https://github.com/octopus7/UnrealEngine/blob/ue5-main/UE5.8_Substrate_Material_Analysis_EN.md
Note: If you encounter a 404 error when accessing the repository, you need to have access to the Unreal Engine source code.
