Using Unreal Engine 5.0.1 binary (from Epic Games Launcher).
When attempting to retarget basic UE4 Mannequin animations to MetaHumans, position of arms, hands and fingers is always wrong/deformed.
Sample project reproducing the problem described below can be downloaded from:
I have set up an IK Rig for MetaHumans (
/Content/MHRetarget/IK_MetaHuman.uasset) and an IK Retargeter (
MetaHuman skeleton is using
f_med_nrw_retarget_pose as Retarget Base Pose:
Translation Retargeting options are set as “Animation” for Root, “Animation Scaled” for Pelvis, “Skeleton” for all other bones.
Here are the IK Retargeting chains for the MetaHuman:
Despite all that, most UE4 Mannequin animations still have the arms/hands/fingers positioned incorrectly, e.g. “Idle_Pistol” from the Animation Starter Pack:
A generic “Idle” pose (arms too close and forward):
And a MoCap block animation (arms at a wrong angle, fingers twisted/skewed sideways):
All of the illustrated assets are provided in the sample project “MHRetarget” (see link above).
The bent elbows / “arms too close” issue affects pretty much all animations, but is especially visible during walking (where hands go through thighs while swinging) and weapon holding.
I understand that I could edit the pose within the “IK Retargeter” manually and move the arms further apart, but that would mean adjusting every MoCap animation individually as every animation looks slightly different after retargeting. I also have quite a large collection of these animations (that work correctly with a UE4 Mannequin), so it would be great to avoid going through it all to apply these manual fixes.
Is there something I am missing?
Is there a way to correct the arm/finger position globally for all attached animations?