Using "mapper->SetResolveCoincidentTopologyToPolygonOffset();" only works when the VTK library is built with OpenGL. But I am using VTK 8.1.1 which is built with OpenGL2. Do you know how to solve this problem when using OpenGL2? Thank you. -- Sent from: http://vtk.1045678.n5.nabble.com/VTK-Users-f1224199.html