gluNurbsCallback(3G)	       OpenGL Reference		  gluNurbsCallback(3G)



NAME
     gluNurbsCallback -	define a callback for a	NURBS object


C SPECIFICATION
     void gluNurbsCallback( GLUnurbs* nurb,
			    GLenum which,
			    GLvoid (*CallBackFunc)( )


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

     which	   Specifies the callback being	defined.  The only valid value
		   is GLU_ERROR.

     CallBackFunc  Specifies the function that the callback calls.


DESCRIPTION
     gluNurbsCallback is used to define	a callback to be used by a NURBS
     object.  If the specified callback	is already defined, then it is
     replaced.	If CallBackFunc	is NULL, then any existing callback is erased.

     The one legal callback is GLU_ERROR:

     GLU_ERROR	    The	error function is called when an error is encountered.
		    Its	single argument	is of type GLenum, and it indicates
		    the	specific error that occurred.  There are 37 errors
		    unique to NURBS named GLU_NURBS_ERROR1 through
		    GLU_NURBS_ERROR37. Character strings describing these
		    errors can be retrieved with gluErrorString.


SEE ALSO
     gluErrorString, gluNewNurbsRenderer


















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