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gluNurbsSurface

Chapter 12

311

Description

Use gluNurbsSurface within a NURBS (Non-Uniform Rational B-Spline) surface

deﬁnition to describe the shape of a NURBS surface (before any trimming). To mark the

beginning of a NURBS surface deﬁnition, use the gluBeginSurface command. To mark

the end of a NURBS surface deﬁnition, use the gluEndSurface command. Call

gluNurbsSurface within a NURBS surface deﬁnition only.

Positional, texture, and color coordinates are associated with a surface by presenting

each as a separate gluNurbsSurface between a gluBeginSurface/gluEndSurface pair. No

more than one call to gluNurbsSurface for each of color, position, and texture data can be

made within a single gluBeginSurface/gluEndSurface pair. Exactly one call must be

made to describe the position of the surface (a type of GL_MAP2_VERTEX_3 or

GL_MAP2_VERTEX_4).

A NURBS surface can be trimmed by using the commands gluNurbsCurve and

gluPwlCurve between calls to gluBeginTrim and gluEndTrim.

Note that a gluNurbsSurface with sKnotCount knots in the u direction and tKnotCount

knots in the v direction with orders sOrder and tOrder must have (sKnotCount - sOrder)

× (tKnotCount - tOrder) control points.

HP b2600 Reference Guide

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