GLvoid* userData )

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

       userData  Specifies a pointer to the user's data.

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

NOTES
       gluNurbsCallbackData  is  available  only  if  the GLU version is 1.3 or
       greater.

SEE ALSO
       gluNewNurbsRenderer, gluNurbsCallback

                                                       GLUNURBSCALLBACKDATA(3G)