Converting to NURBS
The Convert to NURBS command converts 2D objects and 3D polygons into 3D NURBS curves, and converts the faces of solids to NURBS surfaces. This is a quick way of creating NURBS surfaces from an extrusion, sweep, or other solids.
To convert to NURBS curves or surfaces:
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Select Modify > Convert > Convert to NURBS.
The selection is converted to NURBS surface(s) or a 3D NURBS curve, as reflected in the Object Info palette.
If the solid consisted of several faces, the conversion results in a group of NURBS surfaces. Select Modify > Ungroup to access the individual NURBS surfaces that make up the solid.

Creating 3D Objects : Creating NURBS Curves, Circles, and Arcs : Converting to NURBS

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