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Exporting Bouncing Boobs with a Spring Animation

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JustColorado triangle
I need some help getting this animation file into UDK

[ame]https://www.youtube.com/watch?v=dFQfvZtgTa8[/ame]

I read on this forum that you can use a spring controller to get a bouncing effect. So here is what I tried and then I got stuck:

1. I uploaded an unrigged model to Mixamo's autorigger
2. I downloaded it then added spring controllers and reweighted it.
3. I Sent the new model with the changes back to mixamo and then
added a jump rope animation.

4. The bouncing was not working. But I downloaded it. When I opened the animation file, I saw that:
Mixamo kept the extra bones but they didn't seem to understand what a spring controller was. They were just regular bones now and they just followed the parent bone without springing.

5. So I assigned a spring controller again. and It worked fine in max. The result is in the video above.
6. I re-exported the animation. But when I tried to open it again, I got this error message:

BindPose - Incomplete BindPose - The following parent and/or ancestor node(s) is/are not part of the BindPose definition

It works in max even with the error message. But when I import it to UDK. The bones with a spring controller don't move at all. I really want to get this working in UDK.

Any help or advice would be greatly appreciated.

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