Dear David, vtkAppendFilter is all right. I can highlight all selected cells. But erase of the highlight for once selected cell becomes unstable.... Best regards, Oka -- View this message in context: http://vtk.1045678.n5.nabble.com/picked-cell-highlight-tp2854223p2997304.html Sent from the VTK - Users mailing list archive at Nabble.com.