Cylinder is not being displayed on screen

Question

Well, what i'm trying to do is to draw a Cylinder using GLUquadricObj and gluCylinder, the code compiles fine whatever the Cylinder is not being displayed on the OpenGL widget.

void GLWindow::paintGL()
{
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(1,0,0);
    glBegin(GL_POLYGON);
    GLUquadricObj *obj = gluNewQuadric();

    gluCylinder(obj, 1.0, 1, 3, 30, 30);

    glEnd();
}

What's preventing the cylinder from being displayed?

Answer 1

I've fixed it, was an issue with the resizeGL(). Doing glMatrixMode(GL_MODELVIEW); + glMatrixMode(GL_PROJECTION); was causing this.

Answer 2

There's a limited number of things you can do inside a glBegin() block. That list does not include another glBegin().

Also, try a non-default view frustum. I'd recommend gluPerspective().

Answer 3

Are you sure you have the proper initialization of opengl and of the scene in the initializeGL() function?