Imported skeletal mesh rotated 90 degrees upon placement in game

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This is strange. What you suggested didn’t work I’m afraid. Unless I’m doing it wrong.

Just to be clear as this may help, my character is only a rig.
As far as I’m aware I’ve done everything properly when it comes to the bones, etc. And my plan was to use the default animations with my mesh for now, so I can have my test character in game while I work on other things.

The animation re targeting went smoothly, and the animations work, the mesh not deformed. As I said, the only problem is the rotation of my character.

The reason I’m saying this is because I’ve found if I alter the import rotation in any way, the skeletal mesh simply refuses to work with the default animations, and my character ends up massively deformed even after the ‘recursively set translation re targeting skeleton’ .

So, the only way the animations and mesh remain intact is to import as normal, and re target each bone as usual. I have no idea why this is.