Summary
Custom NPC animation system (IK + Retargeter + Blueprint) completely broken after latest UEFN update. Previously working setup now only displays skeletal mesh without animations.
Please select what you are reporting on:
Creative
What Type of Bug are you experiencing?
Devices
Steps to Reproduce
- Create a custom animation setup using two IK Rigs
- Connect both IK Rigs through a Retargeter (RTG)
- Use this setup inside an Animation Blueprint
- Assign the Animation Blueprint to a Blueprint (BP) with a Skeletal Mesh
- Assign this Blueprint to a custom NPC
- Launch the session
Note: This setup was fully working before the latest update without any issues.
Expected Result
The NPC should correctly use the Blueprint and animation system:
- Animations should play normally
- IK system should function correctly
- Retargeted animations should be applied
- The NPC should behave exactly as before the update
Observed Result
- The NPC only displays the skeletal mesh
- No animations are playing
- IK and Retargeter systems appear to be ignored
- The Blueprint is correctly assigned but animation logic does not execute
Additionally, the following error occurs:
“Ensure condition failed: MeshDescriptionBulkData != nullptr”
(File: SkeletalMeshSourceModel.cpp)
Platform(s)
PC (UEFN)
Island Code
4420-9325-8814
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Video
Additional Notes
My image is my horse before the last UEFN update. (You can see the video here https://youtu.be/fjx50aeUnJc )
My video on the post is my horse now…