Converting surfaces and solids to NURBS surfaces

Use the Convert to NURBS command to convert solids and surfaces that are created with the Convert to Surface command to NURBS surfaces.

Meshes created with the Convert to Mesh command can also be converted to NURBS surfaces if you use the Convert to Surface or Convert to Solid command first.

Select a line to convert it to a spline.
The Convert to NURBS command is typically used to convert solids and surfaces to NURBS surfaces, but it can also be used to convert two-dimensional entities (for example, lines, polylines, arcs, circles, etc.) to splines.

To convert entities to NURBS surfaces

   1   Do one of the following to choose Convert to NURBS ():

    On the ribbon, choose Draw 3D > Convert to NURBS (in Convert).

    On the menu, choose Modify > 3D Convert > Convert to NURBS.

    On the Solids Editing toolbar, click the Convert to NURBS tool.

    Type convtonurbs and press Enter.

   2   Select the entities you want to convert.

NURBS surfaces can display with control vertices.
Use the Show CV command to display control vertices; use the Hide CV command to hide them.