The imported modified model has no effect

I am a beginner of Unreal Engine. I am trying to export the character models in the game to Blender for modification, and then import them into the game.

My operation is as follows:

  1. Unpack the pak
  2. Export psk files using umodel
  3. Modify the model in Blender
  4. Import the modified model into UE4 for baking
  5. Pack UASSET and UEXP and mount them to the game directory

But the model presents the following effect in the game:


I want to know which step went wrong. Thanks!

a) Blender materials do not translate to unreal material assets.
b) it looks like the face didn’t import correctly. Could it have reversed normals?
c) If you have access to the model in Unreal then you can directly export it to an FBX file, or is this for a mod for some published game?

Thank you very much for your answer! Now I have discovered a possible cause of the problem:

The original model contained 159 bones, but when I exported it from Blender to FBX and imported it into UE4, the number of bones increased to 160.

QQ20240825-051217

Do you have any idea what might have caused this issue?

Did you export only selected? Perhaps blender exports leaf bones (for instance ends of fingers) that unreal does not use.

Did the character have a root bone at world 0? (0,0,0)
Unreal characters in their skeletons have a bone that goes from 0,0,0 up to the pelvis, perhaps that was missing in your character and it was automatically added on import.

Example skeleton

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Thanks. So is this bone in Blender or UE? How should I handle it?

Those bones are exported from Unreal to Blender