As the title suggests, the animation output after custom motion and FBX export is not the same as what I was working on. Especially in the upper body, the phenomenon is noticeable, and all parts of the head, waist, chest, arms, etc. come out differently than before storage.

I found this to be due to the 'Bake constraint key' function.
If you use 'link' as a props for your character and save or export it, you will get the above error. Even if you use the 'link' function and then unlink it immediately, you get the problem. The way to avoid this problem is to not use Contstraint. But I can't change the direction of the motion clip. Please let me know if there is another good way.

I used this 'link' function to change the direction of the moving character. I put a box on my foot and used it as a rotation axis to change direction more naturally.

I hope this solves the problem.


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After writing this article, I found that the animation still changes in FBX export. As I checked in Unreal, it was a small change, but the neck was different. I don't really know how to solve this.