These topics describe how to create top-level, “starter” NURBS objects.
Topics in this section
Creating Independent Surfaces from NURBS Curve Objects
To create independent surfaces from top-level NURBS curve objects, use the Extrude and Lathe modifiers. Extrude adds height to the curve, creating a shape by sweeping it along the curve's local Z axis. Lathe creates a surface of rotation, revolving the shape along a specified axis. You can also use the Bevel and Bevel Profile modifiers on NURBS curves.
Creating NURBS Curves from Splines
You can turn a spline into a NURBS object formed of CV curves. Once converted, you can no longer edit the spline shape parametrically, but you can edit it as a NURBS object, moving CVs and so on.
Nonrelational NURBS Surfaces
Nonrelational NURBS surfaces provide a way to improve the performance of NURBS with modifiers. These are controlled by the Relational Stack toggle on the General rollout for NURBS objects.
Display Controls for NURBS Models
The checkboxes on the General rollout for a NURBS curve or surface control how the object is displayed in viewports. If all checkboxes are turned off, the NURBS object is invisible (except for the white bounding-box indicators displayed in shaded viewports when the object is selected).