[SOLVED] How to force QGLWidget to update screen?



  • I'm drawing a simple scene with Open GL. I've subclassed QGLWidget and overriden paintGL(). Nothing fancy there:

    @void CGLWidget::paintGL()
    {
    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    glClear(GL_COLOR_BUFFER_BIT);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    
    gluLookAt (120.0, 160.0, -300.0, 0.0 + 120.0, 0.0 + 160.0, 2.0 - 300.0, 0.0, 1.0, 0.0);
    glScalef(1.0f/300.0f, 1.0f/300.0f, 1.0f/300.0f);
    glClear(GL_DEPTH_BUFFER_BIT);
    
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(80.0, width()/(double)height(), 5.0, 100000.0);
    glMatrixMode(GL_MODELVIEW);
    
    glBegin(GL_POINTS);
    glColor3f(1.0f,0.6f,0.0f);
    glVertex3d(x, y, z);
    // ...drawing some more points...
    glEnd();
    

    }@

    I have a timer in main window which triggers updateGL() of GL widget. I've verified that it results in paintGL() being called. However, the actual picture on the screen is only updated very rarely. Even if I resize the window, scene is not updated. Why is that and how can I force it to update?



  • Found the problem, sorry for bothering. Was just a logical mistake, unrelated to GLWidget or the code in the OP.

    Found out I should call update() and not updateGL(), though.


Log in to reply
 

Looks like your connection to Qt Forum was lost, please wait while we try to reconnect.