it works fine now thank you for your help just one last question: the render Window display for viewing in the GUI is an OpenGL window of vtk or own of Qt Qui?? Ahmed -- View this message in context: http://vtk.1045678.n5.nabble.com/configuration-of-VTK-with-Qt-tp5718870p5718885.html Sent from the VTK - Users mailing list archive at Nabble.com.