Convert a NURBS or polygonal surface to a subdivision surface
 
 
 

Modify > Convert > NURBS to Subdiv

Modify > Convert > Polygons to Subdiv

Alt + Shift + ~

Troubleshooting Convert

  1. If the polygon mesh does not convert or results in a hard-to-use subdivision surface, see the Prepare a polygonal surface for conversion to a subdivision surface.
  2. If the NURBS surface does not convert to a subdivision surface or results in a hard-to-use subdivision surface see the following: