I am having trouble getting objects to constrain to another sim. I ran out a simulation of a ball broken into pieces, and I am just trying to read that in and stick boxes to the outside of those pieces.
The closest I have gotten is to write out “.sim” files and read those into the second simulation.
The problem is that the constraints seem to also constrain the objects to other objects they are not associated with.

I have tried this with packed primitives as well, with the same outcome.

It looks like it can be done with hard constraints, but they have a little too much play in them. Its not a good rigid constraint relationship