GLvoid* userData )

PARAMETERS
       nurb      Specifies the NURBS object (created with gluNewNurbsRenderer).

       userData  Specifies a pointer to the user's data.

DESCRIPTION
       gluNurbsCallbackDataEXT  is  used to pass a pointer to the application's
       data to NURBS tessellator. A copy of this pointer will be passed by  the
       tessellator in the NURBS callback functions (set by gluNurbsCallback).

SEE ALSO
       gluNurbsCallback

                                                    GLUNURBSCALLBACKDATAEXT(3G)