Retargeting Animations in UE4
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This is a shorten guide from the much more complete official tutorial here: https://docs.unrealengine.com/en-US/Resources/Showcases/MetaHumans/RetargetingAnimationsOntoMetaHumans/index.html
Download and add the Animation Starter Pack
Setting up the Retarget Pose
The MetaHumans sample project comes with Pose Assets for male and female characters that match the A-frame pose the UE4 Mannequin has. This ensures that retargeting the mannequin's skeleton onto the MetaHuman skeleton will be successful.
Use the Retarget Manager to ensure MetaHuman Skeleton now has the precise matching orientation and position of bones to the UE4 Mannequin that will make retargeting later a success. Using this pose does not change the proportions of your MetaHuman Skeleton.
Defining the Retarget Rigs for Each Skeleton
You will set the type of rig the Skeletons use during the retargeting procedure. Since both are bipedal humanoid characters, use the Humanoid Rig that's included with Unreal Engine. It uses information from the skeleton's bone hierarchy to retarget the UE4 Mannequin to the MetaHuman one.
Retargeting Selected Animation onto a MetaHuman
With Retarget Manager take some animations and retarget those from the UE4 Mannequin to the MetaHuman character