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GLUBEGINCURVE(3G)			  OpenGL Manual 			GLUBEGINCURVE(3G)

NAME
       gluBeginCurve - delimit a NURBS curve definition

C SPECIFICATION
       void gluBeginCurve(GLUnurbs* nurb);

C SPECIFICATION
       void gluEndCurve(GLUnurbs* nurb);

PARAMETERS
       nurb
	   Specifies the NURBS object (created with gluNewNurbsRenderer()).

DESCRIPTION
       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
       GLU_MAP1_VERTEX_3 or GLU_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()(GLU_EVAL_BIT) and glPopAttrib()().
       See the glPushAttrib() reference page for details on exactly what state these calls
       preserve.

EXAMPLE
       The following commands render a textured NURBS curve with normals; texture coordinates and
       normals are also specified as NURBS curves:

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

SEE ALSO
       gluBeginSurface(), gluBeginTrim(), gluNewNurbsRenderer(), gluNurbsCurve(), glPopAttrib(),
       glPushAttrib()

COPYRIGHT
       Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI
       Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org				    06/10/2014				GLUBEGINCURVE(3G)
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