def initializeGL(self):
# initialize the scene
self.initialize()
self.initialize_default()
# finalize
self.finalize()
# initialize the renderer
self.renderer = GLRenderer(self.scene_creator.get_scene())
self.renderer.initialize()
# update the variables (with set_data in paint_manager.initialize())
# after initialization
for visual, kwargs in list(self.data_updating.items()):
self.set_data(visual=visual, **kwargs)
