@BoboFuego said in How to use anti-aliasing on QGLWidget?:

how can I add MyWidget.h as promoted class for it in the MainWindow constructor?

Promoted class won't allow you to pass parameters to a constructor. Just don't add it in the designer at all.
Lets say you've got this designer_widget as a central widget of the mian window in the designer. Just delete it entirely and add it in code:

MainWindow::Mainwindow(QWidget* parent) : QMainWindow(parent) { ui->setupUi(this); MyWidget* gl_widget = new MyWidget(); setCentralWidget(gl_widget); }

Hi and welcome to devnet,

Do I understand correctly that you want to run your FPS at 100Hz ?

In any case, you'll have to go OpenGL (QWindow and friends)