Hi PaQ, actually it looks like I spoke too soon about LWO, yes there does seem to be a way to indicate the parent of a mesh layer in LWO so that may be a possibility to leverage for translation of groups, although I'm not sure if I would be able to get to that right away.

There is another complication that I want to allow for objects to possibly belong to more than one group in MoI, and that type of structure doesn't look like it would fit. But if you just avoided that kind of a thing it might work.

For OBJ format, I just did a double check to make sure, and there does not seem to be any method available there for hierarchy though.

- Michael