There is a "format" between nurbs and polygon called "Subdivission", in MAYA we use The "Subdiveission" and in Rhino we use "T-splines"
I creat a poly model in maya, and turn it to "subdivission", and then turn "subdivission" to nurbs,and then export the nurbs to IGES to MOI.. and I can make a boolean hole on it, cut ,make curves---

If MOI can turn poly to nurbs directly like this,not just a Wireframe, is so cool, isn't it?