So I imported my UE4 based skeletal mesh to Blender in order to make some animations. I saw somewhere here that I should check Auto bone orientation when importing the .fbx file. The auto orient works fine inside Blender, but when I export the animation to UE4, it becomes all messed up.
Everything works fine without the Auto orient bones option, except the armature looks ugly in Blender and makes it kind of hard to animate there.
it might be easier to create your own rig in blender, then use animation retargeting to copy animations from the old skeleton. i still haven’t seen anyone get that ue4 mannequin properly imported into blender in a usable way.
You need to get the export settings right to export Blender skeletons/animations to UE4, auto bone rotate is not required for this. Here are the settings that work for me, Primary and Secondary bone axis are the most important ones.