GLUBEGINCURVE(3G)														 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.

       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.

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

																 GLUBEGINCURVE(3G)