UE5 IK Retargeter maps Base Pose Animations to "empty" (Retargeting ALSv4 to MetaHuman)

Development Character & Animation
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I’m trying to retarget Advanced Locomotion System to the Metahuman Skeleton using the new UE 5 IK Retargeter.
My setup of the IK Rigs seem ok, single animations that I retarget look fine.

When I try to retarget the Advanced locomotion System Anim Blueprint “ALS_AnimBP” through rightlick > “Retarget Animation Asset”, the retargeted resulting Animation Blueprint heavily deforms the Skeleton as shown below.

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image487×541 55.1 KB

The reason for this is that the IK Retargeter fails to remap the “Base Pose Animations” on additive animations and leaves it silently empty.

retarget_fail
retarget_fail1920×794 74.2 KB

Manually setting the “Animation Base Pose” to the correct retargeted Animation seems to fix the issue, however it is error prone and cumbersome because around 20 animations have to remapped manually. UE 5 should never silently fail and insert empty values without any displayed information.

Did anyone encountered the same issue and has a solution to this, to successfully retarget the Advanced Locomotion System to MetaHuman using the new IK retargeter?

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Definitly not just you, 5.0 among other things made ALS a complete mess. Guys on discord channel are stuggling to make it work as well.

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I debugged the issue with scaling and missing Animation Ref Poses and unfortunately an Engine fix is required. I pull requested the fix to epic already: https://github.com/EpicGames/UnrealEngine/pull/9119.

You don’t have to rebuild your full engine to apply the fix. It is enough to copy this directory https://github.com/EpicGames/UnrealEngine/tree/a6be5072e634a4974376d077542bbd1647ea1fe8/Engine/Plugins/Animation/IKRig (version 5.0.1) to your Projects Plugins directory and recompile your project. The plugin in the project will be used instead of the engine one.

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Thanks for this PR. The fix has been integrated into UE5/Main 20124156.

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