Animation clips that have multiple characters

Hello.

I have several animation clips that include multiple actors. I've been trying to get Unity to import these clips with multiple rigs, but that doesn't seem to be something it can do.

The problem I'm running into is that if I export the animation from MotionBuilder with only one character selected, Unity seems to slide the character all over the place, they don't stay in place relative to the 0,0,0 position in the scene. Setting the Animation Root Transform Position to various settings doesn't seem to do anything either.

Just wondering if anyone has any experience with animation clips that have multiple actors in them.

thanks

 

So nobody has ever done anything like this?