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   GLMAP1VERTEX3   or
       GLMAP1VERTEX4.   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(GLEVALBIT) and glPopAttrib().  See the glPushAttrib ref-
       erence page for details on exactly what state these calls preserve.

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

       gluBeginCurve(nobj);
          gluNurbsCurve(nobj, ..., GLMAP1TEXTURECORD2);
          gluNurbsCurve(nobj, ..., GLMAP1NORMAL);
          gluNurbsCurve(nobj, ..., GLMAP1VERTEX4); gluEndCurve(nobj);

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




                                                             GLUBEGINCURVE(3G)