why am i getting this strange window when i run my program, instead of what am suppose to get (window filled with red)
OpenGL rendering problem
To clarify Spiro's snarky answer: you gave us absolutely zero information other than "it's broke." 
Give us your full (ready-to-compile) code or a minimal (ready-to-compile) test case that exhibits the problem.
Give us your full (ready-to-compile) code or a minimal (ready-to-compile) test case that exhibits the problem.
That paintGL isn't probably called at all, so you have to tell qt that the widget should be updated. Try calling updateGL.
Your window is showing a chunk of uninitialized memory, so it is showing whatever was there before. I appears you are clearing the screen. Are you swapping the back buffer to the window after you are done drawing?
EDIT: I have never used qt, but it appears that Sponji is referring to the same thing, make sure you present your rendered scene to the window.
Ensure that your view inherits from QGLWidget.
If you want the screen to refresh actively, create a QTimer set to a slot that calls repaint() on that widget.
For example:
If you still have a problem, then you should probably include a lot more information in your next post.
L. Spiro
If you want the screen to refresh actively, create a QTimer set to a slot that calls repaint() on that widget.
For example:
class C3dViewWidget : public QGLWidget {
…
protected :
// == Members.
// Update timer.
QTimer m_tTimer;
private slots :
/**
* Called by the timer to update this view.
*/
void Update();
};
void C3dViewWidget::InitWidget() {
connect( &m_tTimer, SIGNAL( timeout() ), this, SLOT( Update() ));
}
void C3dViewWidget::Update() {
this->repaint();
}If you still have a problem, then you should probably include a lot more information in your next post.
L. Spiro
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