Good find! It looks like it just supports THREE.NURBSCurve, though, which would mean you get NURBS curves, converted to lines, but not surfaces. three.js does also have a THREE.NURBSSurface class, although I don’t know if any loaders support it. It still has to be converted to a BufferGeometry for rendering though, so your life will probably be simpler if you can triangulate it before export. 