gluNurbsCallback.3gl

Name

  gluNurbsCallback - define a callback for a NURBS object

C Specification

  void gluNurbsCallback( GLUnurbsObj *nobj,

			 GLenum	which,

			 void (*fn)( )

Parameters

  nobj	 Specifies the NURBS object (created with gluNewNurbsRenderer).



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

	 GLU_ERROR.



  fn	 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 fn

  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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Last Edited: Mon, May 22, 1995

AFV