GL_QUADS Problem

For some reason, whenever I try to make a quad with OpenGL, it always has a clear triangle in it. I included a picture that show an example of it.

Code please.

Code:

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void Render(void)
{
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glPushMatrix();
        glTranslatef(-1.0f, -1.0f, 0.0f);
        glRotatef(SpinX, 1.0, 0.0, 0.0);
        glRotatef(SpinY, 0.0, 1.0, 0.0);
        glRotatef(SpinZ, 0.0, 0.0, 1.0);
        glBegin(GL_TRIANGLES);
                glColor3f(1.0f, 1.0f, 1.0f);
                glVertex3f(0.0f, 0.0f, 0.0f);
                glVertex3f(0.0f, 2.0f, 0.0f);
                glVertex3f(2.0f, 0.0f, 0.0f);
                glColor3f(1.0f, 0.0f, 0.0f);
                glVertex3f(0.0f, 0.0f, 3.0f);
                glVertex3f(0.0f, 2.0f, 3.0f);
                glVertex3f(2.0f, 0.0f, 3.0f);
        glEnd();
        glBegin(GL_QUADS);
                glColor3f(0.0f, 1.0f, 0.0f);
                glVertex3f(0.0f, 0.0f, 0.0f);
                glVertex3f(0.0f, 0.0f, 3.0f);
                glVertex3f(2.0f, 0.0f, 0.0f);
                glVertex3f(2.0f, 0.0f, 3.0f);
        glEnd();
        glPopMatrix();

        glutSwapBuffers();
}

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Just looking at that picture... it looks like a shadow.

it's not, because if you rotate the image you can see right through it :eek:

you are drawing the vertices in the wrong order...

Code:

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you are doing this...

1----2
    /
  /
  /
3----4

you need to do this

4--3
  |
  |
1--2

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edit: ascii art

I guess I should look up the order of vertices again :D

thx

or turn off culling