Dear David, Thanks a lot for your reply. There's only one question that I have to add the file of drand48 myself. Regards, Yue -- View this message in context: http://vtk.1045678.n5.nabble.com/about-VTK-Examples-Cxx-PolyData-WarpScalar-tp5724831p5724866.html Sent from the VTK - Users mailing list archive at Nabble.com.