Converting a spline-fit polyline to a spline

Both 2D and 3D spline-fit polylines can be converted to splines. If necessary, you can use the Polyline Edit command (Spline option) to convert a polyline to a spline-fit polyline.

To convert a spline-fit polyline to a spline

   1   Do one of the following to choose Spline CV or Spline Fit ():

    On the ribbon, choose Draw > Spline CV (in Draw) or Draw 3D > Spline CV (in Curves).

    On the menu, choose Draw > Spline > Spline CV.

    On the Draw toolbar, click the Spline CV tool.

    Type spline and then press Enter.

   2   Choose Entity.

    3    Select the 2D or 3D polyline that fits the spline, then press Enter.

Other two-dimensional entities can be converted to splines using the Convert to NURBS command.
The Convert to NURBS command is typically used to convert solids and surfaces to NURBS surfaces, but can also be used to convert two-dimensional entities (for example, lines, polylines, arcs, circles, etc.) to splines. For more details, see Converting surfaces and solids to NURBS surfaces.