Thank you for yoyr rply . I want to display ellipsoid and create slider that represents the radius (by using signal slot) , if i change one radius (in the slider) the ellipsoid change as well. Thank you in advance -- View this message in context: http://vtk.1045678.n5.nabble.com/VTK-Qt-tp3264170p3264416.html Sent from the VTK - Users mailing list archive at Nabble.com.