Hi Scooter, yes the sub-d conversion is almost the same as Catmull-Clark, the only differences are at extraordinary vertices.

There isn't currently any way to set the edge weighting in MoI but that is something I want to work on in the future. Additionally the .obj file format does not itself have any method of representing edge weighting so any transfer through .obj format will not preserve edge weighting anyway.

FBX format does have a way to store edge weighting and that's a format that I want to add in the future.

- Michael