A step-by-step tutorial on setting up wrinkle maps for facial animation using Blender and Unreal Engine, with a system similar to MetaHumans. Covers material setup, bone-driven animation, and more. Facial control rig creation inside Unreal is not included.
https://dev.epicgames.com/community/learning/tutorials/LZ3K/fortnite-metahuman-blender-to-unreal-engine-wrinkle-maps-full-workflow-tutorial