I think to solve this problem need set all normals perpendicularly to surface. But how to do this? -- View this message in context: http://vtk.1045678.n5.nabble.com/vtkVoxelContoursToSurfaceFilter-with-2-contours-tp4295036p4307143.html Sent from the VTK - Users mailing list archive at Nabble.com.