Just tried vtkCleanPolyDataFilter. Impurities are still there after cleaning. superZZ -- View this message in context: http://vtk.1045678.n5.nabble.com/Remove-impurities-from-produced-polydata-of-MarchingCube-tp5010936p5012430.html Sent from the VTK - Users mailing list archive at Nabble.com.