Non-Uniform Rational B-Splines (NURBS) provide a 3D modeling framework based on geometric primitives and drawn curves.

You can use NURBS in two ways:

- Construct 3D models from NURBS primitives.
Primitives are simple 3D objects created in the shape of common geometric forms such as cubes, spheres, cones, and so on. Primitives can be a great starting point for many 3D shapes. You can modify the attributes of NURBS primitives to modify their shape. You can also modify NURBS primitives by trimming away portions of their forms, beveling their edges, or by sculpting them into different shapes using sculpting tools.

- Construct NURBS curves that define the basic outline of the 3D form you want to construct, then use the curves as a basis for constructing NURBS surfaces.
To find options for constructing and modifying NURBS curves and surfaces:

- You can draw curves by placing control vertices, or edit points. The curve drawing tools are found in the Create menu.
- The options for creating and editing NURBS curves and NURBS surfaces are found in the Modeling menu set.
- You can also find NURBS options on the Curves/Surfaces shelf.