I think you can use vtktextActor for labelling check this out: http://www.vtk.org/Wiki/VTK/Examples/Cxx/Widgets/TextWidget -- View this message in context: http://vtk.1045678.n5.nabble.com/how-to-label-a-3d-point-tp5728526p5728530.html Sent from the VTK - Users mailing list archive at Nabble.com.