N
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.
See Also
gluBeginSurface,
gluBeginTrim,
gluNewNurbsRenderer,
gluNurbsCurve,
gluPwlCurve
To Next Page
Loading...
