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Manual Reference Pages  - GLUBEGINSURFACE (3G)

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gluBeginSurface, gluEndSurface - delimit a NURBS surface definition

CONTENTS

C Specification
Parameters
Description
Example
See Also

void gluBeginSurface( GLUnurbs* nurb )

void gluEndSurface( GLUnurbs* nurb )

nurb	Specifies the NURBS object (created with  gluNewNurbsRenderer).

Use  gluBeginSurface to mark the beginning of a NURBS surface definition. After calling  gluBeginSurface, make one or more calls to  gluNurbsSurface to define the attributes of the surface. Exactly one of these calls to  gluNurbsSurface must have a surface type of  GL_MAP2_VERTEX_3 or  GL_MAP2_VERTEX_4. To mark the end of the NURBS surface definition, call  gluEndSurface.

Trimming of NURBS surfaces is supported with  gluBeginTrim,  gluPwlCurve,  gluNurbsCurve, and  gluEndTrim. See the  gluBeginTrim reference page for details.

GL evaluators are used to render the NURBS surface as a set of polygons. Evaluator state is preserved during rendering with glPushAttrib( GL_EVAL_BIT) and glPopAttrib(). See the glPushAttrib reference page for details on exactly what state these calls preserve.

The following commands render a textured NURBS surface with normals; the texture coordinates and normals are also described as NURBS surfaces:

.Ex gluBeginSurface(nobj);
gluNurbsSurface(nobj, ..., GL_MAP2_TEXTURE_COORD_2);
gluNurbsSurface(nobj, ..., GL_MAP2_NORMAL);
gluNurbsSurface(nobj, ..., GL_MAP2_VERTEX_4); gluEndSurface(nobj);
.Ee

 gluBeginCurve(3G),  gluBeginTrim(3G),  gluNewNurbsRenderer(3G),  gluNurbsCurve(3G),  gluNurbsSurface(3G),  gluPwlCurve(3G)

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