NAME
	  gluNurbsCallbackDataEXT - set	a user data pointer


     C SPECIFICATION
	  void gluNurbsCallbackDataEXT(	GLUnurbs* nurb,
					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