glubegincurve(3G) — IRIX 6.5.3f



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 GLMAP1VERTEX3 or
     GLMAP1VERTEX4.  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(GLEVALBIT) 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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