Hi Crusoe - I guess I don't understand why this feature isn't provided in your sub-d modeler environment.

OBJ files do support the concept of sharp rendered edges within the file. For example, if you draw a cube and export it to an .obj file, you should see a sharp-edged cube when you import it elsewhere.

The cube should have sharp edges because MoI wrote different smoothing information for each face even though the faces share the same x,y,z point locations.

If you want to preserve this creasing in your sub-d modeler, shouldn't they have a method over there to preserve the existing creasing and assign a crease to every current sharp edge?

Maybe I don't quite follow what you're asking for though...

- Michael