gluBeginCurve(3G)	       OpenGL Reference		     gluBeginCurve(3G)



NAME
     gluBeginCurve, gluEndCurve	- delimit a NURBS curve	definition


C SPECIFICATION
     void gluBeginCurve( GLUnurbs* nurb	)

     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 GL_MAP1_VERTEX_3 or
     GL_MAP1_VERTEX_4.	To mark	the end	of the NURBS curve definition, call
     gluEndCurve.

     OpenGL 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.


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











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