Hi Paolo,

re:
> and the main idea come in mind because the Brep handle both geometry Nurbs and
> mesh, and the whole idea is was take the boundary info from that to do the conversion
> taking into account the boundary of surfaces

Sorry, I'm not understanding this part. Do you mean something like the .Brep file would contain both a mesh version and a NURBS version of the same object?

And that would be something you would create in FreeCAD and then send into MoI for conversion?

But would the mesh be a sub-d control cage mesh or just a rendering mesh made up of triangles only?

If it's a triangle render mesh and there is no sub-d control cage mesh then how would the sub-d converter find a sub-d control cage for the conversion?

And if there is a NURBS version of the object already in the file then why not just transfer the NURBS version over itself, why would there be any polygon to NURBS conversion needed?

- Michael