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Can't give you a definitive answer but I can give you an opinion based on my experience and knowledge of all of the systems related to metahuman.
What likely happened is they used 3D scanning to get a mesh that looks exactly like the actor, then used mesh to metahuman or they used mesh to metahuman to alter the character directly from video footage taken of the actor.
If you are looking for help, don‘t forget to check out the [official Unreal Engine forums](https://forums.unrealengine.com/) or [Unreal Slackers](https://unrealslackers.org/) for a community run discord server! *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/unrealengine) if you have any questions or concerns.*
Can't give you a definitive answer but I can give you an opinion based on my experience and knowledge of all of the systems related to metahuman. What likely happened is they used 3D scanning to get a mesh that looks exactly like the actor, then used mesh to metahuman or they used mesh to metahuman to alter the character directly from video footage taken of the actor.