By the way, did you manage to import the animation from Heroes, or did you have to create it from scratch?
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If you did manage to import it, please tell me what software and plugins you used.
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But at least you know what inverse kinematics is.
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I removed IK and rotated the animation by 90 degrees. You can't change the coordinate system of the original gr2 Nival skeleton that you imported into 3DS MAX; otherwise, it will be a mess. I was creating a movement animation for a ballista in the mask, and after the very first test, I had to redo it.