I've misunderstood the coordinate system you mentioned. You should just change the coordinate-> SetCoordinateSystemToWorld() to SetCoordinateSystemToDisplay() -- View this message in context: http://vtk.1045678.n5.nabble.com/Draw-a-2D-line-tp5726509p5726513.html Sent from the VTK - Users mailing list archive at Nabble.com.