Convert selected objects to Nurbs surfaces of Bezier form.
Select the objects to be converted.
Specify options in the Control Bar.
Accept the tool by selecting Accept on a View window's popup menu or by clicking the Accept button on the Control Bar.
The To Nurbs tool has the following options:
Density U - Number of Bezier patches per complexity unit in the 'U' direction.
Density V - Number of Bezier patches per complexity unit in the 'V' direction.