Hello, I am working on a alien character for which I carefully wrapped a metahuman head on to work with.
After cleaning all the base mouth / lips expressions to adapt them to my character specific characteristics, I realized that the rest of the combined expressions are still “corrupted” with the deformations initialized on the MetaHuman creation, instead of simply combining the base expressions / blendshapes I made.
I noticed there are many blendshapes involved in a combined expression but I would like to understand what is the point in it and why the final result doesn’t look like a simple combination of the two (or more) related expressions / blendshapes?
This situation currently forces me to manually create combined blendshapes for each of the combined expressions and then transfer vertex position to get the result I am expecting to have by default, but it takes so much time..
I tried to look for deep documentation of how combined expressions works, but I couldn’t find any so if you have one to share I would be delighted to understand this system a bit better and to avoid losing so much in such situation and have a more optimized workflow.
Also, just for anyone who would be interested, here is the workflow shared at Unreal Fest Orlando 2025 that I followed.
Thank you in advance for your help 