drawRect inside paintGL()

[mickey]

with your code console ask me this: 'painter.begin(this);' adding this istruction seems works , but when I traslate /rotating my scene square disappear (calls to updateGL() ); strange: if I click on my scene (updateGL occurs) rect appear; I see that If I moveMouse with buttonMouse down paintEvent() not occurs; instead If I click only, paintEvent occur();
Furthermore I have QWidget::mouseLeave() where inside there's an updateGL(): when I mouse mouse out, updateGL occurs and rect disappear!
mmmmm....

[jacek]

It looks like QGLWidget repaints are handled in a special way. You might try rendering your scene to a pixmap, painting on that pixmap and then displaying it, but this will affect the performance.