I hqve to use q TriangleFilter in the OnLeftButtonDown() , have you an idea what shall i make as Input for it!!! -- View this message in context: http://vtk.1045678.n5.nabble.com/Need-to-pick-a-cell-and-its-neighbors-tp5715057p5715061.html Sent from the VTK - Users mailing list archive at Nabble.com.