Some of these models might be able to be converted to NURBS by using the Quadremesher > SubD > NURBS. Here is the more information about it: Rhino 7 Feature: QuadRemesh
Some of these models might be able to be converted to NURBS by using the Quadremesher > SubD > NURBS. Here is the more information about it: Rhino 7 Feature: QuadRemesh