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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(3G), gluBeginTrim(3G), gluNewNurbsRenderer(3G), gluNurbsCurve(3G), glPopAttrib(3G), glPushAttrib(3G)





                                                                                           GLUBEGINCURVE(3G)