OpenGL Programming Guide

Chapter 11Evaluators and NURBS

The GLU NURBS Interface

Although evaluators are the only OpenGL primitive available to directly draw curves and surfaces, and even though they can be implemented very efficiently in hardware, they're often accessed by applications through higher-level libraries. The GLU provides a NURBS (Non-Uniform Rational B-Spline) interface built on top of the OpenGL evaluator commands.

A Simple NURBS Example

Trimming

OpenGL Programming Guide