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Manual Reference Pages  - GLUBEGINCURVE (3G)

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gluBeginCurve, gluEndCurve - delimit a NURBS curve definition

CONTENTS

C Specification
Parameters
Description
Example
See Also

void gluBeginCurve( GLUnurbs* nurb )

void gluEndCurve( GLUnurbs* nurb )

nurb	Specifies the NURBS object (created with  gluNewNurbsRenderer).

Use  gluBeginCurve to mark the beginning of a NURBS curve definition. After calling  gluBeginCurve, make one or more calls to  gluNurbsCurve to define the attributes of the curve. Exactly one of the calls to  gluNurbsCurve must have a curve type of  GL_MAP1_VERTEX_3 or  GL_MAP1_VERTEX_4. To mark the end of the NURBS curve definition, call  gluEndCurve.

GL evaluators are used to render the NURBS curve as a series of line segments. 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 curve with normals; texture coordinates and normals are also specified as NURBS curves:

.Ex gluBeginCurve(nobj);
gluNurbsCurve(nobj, ..., GL_MAP1_TEXTURE_COORD_2);
gluNurbsCurve(nobj, ..., GL_MAP1_NORMAL);
gluNurbsCurve(nobj, ..., GL_MAP1_VERTEX_4); gluEndCurve(nobj);
.Ee

 gluBeginSurface(3G),  gluBeginTrim(3G),  gluNewNurbsRenderer(3G),  gluNurbsCurve(3G), glPopAttrib(3G), glPushAttrib(3G)

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