`class OccView : public QWidget ` not working but `class OccView : public QGLWidget ` working checkout this https://github.com/eryar/occQt/issues/15#event-1994570387
class OccView : public QWidgetnot workingbut
class OccView : public QGLWidgetworkingcheckout this eryar/occQt#15 (comment)