I was referring to imported meshes, built as native sub-d cages in other modelers. Perhaps a system issue but I wouldnt think so... I suppose if I did not have access to Tsplines, then yeah I probably would have held some hope for Amapi to improve in this area.. I do also remember Amapi's surfacing was maximum C1, so not sure how useful the output would be anyway if nurbs conversion shared this same limitation...