Bulk Renaming Morph Targets in UE5

Development Programming & Scripting
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1

Hi all,

I’ve been digging into bulk renaming morph targets inside Unreal Engine 5.7 (also had attempts in 5.5 and 5.6) and wanted to share findings, since I hit a wall.

What I tried

I wrote a small editor plugin that:

  1. Iterates over USkeletalMesh->GetMorphTargets()
  2. Attempts to rename each morph to match a new naming scheme
  3. Updates skeleton curves to match

Example snippet (simplified):

for (UMorphTarget* Morph : SkelMesh->GetMorphTargets())
{
    const FString OldName = Morph->GetName();
    const FString NewName = OldName.Replace(TEXT("UniversityStudent"), TEXT("glassesGuy"));

    Morph->Rename(*NewName, nullptr);  // Attempt rename
    SkelMesh->RegisterMorphTarget(Morph); // Re-register
}

What happened

  • Unreal would show a dialog listing renamed morphs :white_check_mark:
  • Skeleton curves updated :white_check_mark:
  • But after saving, the .uasset on disk still had the old names :cross_mark:
  • On reload, Unreal reverted everything :cross_mark:

I know that USkeletalMesh::RenameMorphTarget exists, I have attempted using it but got just as far.

Please let me know if you have any ideas!