>>>>> "SL" == Song Li <lisong at vrac.iastate.edu> writes: SL> Hi, Does anybody know which class in VTK4.0 substitute SL> "vtkNormals" in VTK3.2 ??? or any method to fix the program SL> using"vtkNormals" while VTK is upgraded to 4.0 ?? Thank!!!! Please read this carefully: http://public.kitware.com/cgi-bin/vtkfaq?req=show&file=faq06.007.htp prabhu