See video here and other linked video for more details.
• UE5 IK Retarget with Root Motion
follow up: • UE5 Best retargeting results with extreme ...
-Old Notes-
I've got through multiple setups and every possible way that may make sense to try to copy the root motion of the root bone and retarget to another. The only results we see is root motion getting copied to the pelvis, which is NOT root motion that would be pelvic motion.
So far I see no way to retarget root motion animations with Preview 1 or 2. It always copies the root movement to the pelvis. If you set the Pelvis as the root. If you set the root as the root nothing happens.. no coping happens.. my guess it's unfinished still.
It's very easy to test.
Open an animation with root motion. Click on the root bone... see it moving on the X,Y.. Click on the pelvis, it only moves on the Z.