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 © 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			  03/16/2013		     GLUBEGINCURVE(3G)

Vote for polarhome