Can you offer me which opengl version you use?? I use opengl, not openGL2. (I select it when building at CMake-GUI.) -- View this message in context: http://vtk.1045678.n5.nabble.com/Re-Problem-of-VTK-QVTKWidget-and-QOpenGLWidget-tp5734606p5734610.html Sent from the VTK - Users mailing list archive at Nabble.com.