Hello, Please see this : http://vtk.1045678.n5.nabble.com/The-cross-coplane-issue-when-draw-polyline-with-mesh-surface-td5731146.html#a5731803 -- View this message in context: http://vtk.1045678.n5.nabble.com/Line-Surface-vs-Surface-with-Edges-tp5731770p5731804.html Sent from the VTK - Users mailing list archive at Nabble.com.