OpenGL cube's faces mess up

This is a discussion on OpenGL cube's faces mess up within the Game Programming forums, part of the General Programming Boards category; Can someone give me the code that draws a cube in OpenGL with each face a different colour because I ...

  1. #1
    Hi ay_okay's Avatar
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    OpenGL cube's faces mess up

    Can someone give me the code that draws a cube in OpenGL with each face a different colour because I did it with rectangles not polygons and the faces go through each other. Thanks alot!

  2. #2
    Confused Magos's Avatar
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    Post the code you have and we may correct it. Could be the z-buffer, is it enabled?
    MagosX.com

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  3. #3
    Hi ay_okay's Avatar
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    Code:
    glPushMatrix();
                
                
                glColor3f(1.0f, 0.0f, 0.0f);
                glBegin(GL_TRIANGLE_STRIP);                            //back
                     glVertex3f(-1.0f, 0.0f, -1.0f);
                     glVertex3f(-1.0f, -1.0f, -1.0f);
                     glVertex3f(0.0f, 0.0f, -1.0f);
                     glVertex3f(0.0f, -1.0f, -1.0f);
                glEnd();
                glColor3f(1.0f, 1.0f, 0.0f);
                glBegin(GL_TRIANGLE_STRIP);                            //left
                     glVertex3f(-1.0f, 0.0f, -1.0f);
                     glVertex3f(-1.0f, -1.0f, -1.0f);
                     glVertex3f(-1.0f, 0.0f, 0.0f);
                     glVertex3f(-1.0f, -1.0f, 0.0f);
                glEnd();
                glColor3f(1.0f, 0.0f, 1.0f);
                glBegin(GL_TRIANGLE_STRIP);                            //right
                     glVertex3f(0.0f, 0.0f, -1.0f);
                     glVertex3f(0.0f, -1.0f, -1.0f);
                     glVertex3f(0.0f, 0.0f, 0.0f);
                     glVertex3f(0.0f, -1.0f, 0.0f);
                glEnd();
                glColor3f(0.0f, 1.0f, 1.0f);
                glBegin(GL_TRIANGLE_STRIP);                            //bottom
                     glVertex3f(-1.0f, -1.0f, -1.0f);
                     glVertex3f(-1.0f, -1.0f, 0.0f);
                     glVertex3f(0.0f, -1.0f, -1.0f);
                     glVertex3f(0.0f, -1.0f, 0.0f);
                glEnd();
                glColor3f(0.0f, 0.0f, 1.0f);
                glBegin(GL_TRIANGLE_STRIP);                            //top
                     glVertex3f(-1.0f, 0.0f, -1.0f);
                     glVertex3f(-1.0f, 0.0f, 0.0f);
                     glVertex3f(0.0f, 0.0f, -1.0f);
                     glVertex3f(0.0f, 0.0f, 0.0f);
                glEnd();
                glColor3f(1.0f, 0.5f, 0.5f);
                glBegin(GL_TRIANGLE_STRIP);                            //front
                     glVertex3f(-1.0f, 0.0f, 0.0f);
                     glVertex3f(-1.0f, -1.0f, 0.0f);
                     glVertex3f(0.0f, 0.0f, 0.0f);
                     glVertex3f(0.0f, -1.0f, 0.0f);
                glEnd();
                glPopMatrix();
    That's my cube. If you add some rotatef's then you'll see what I mean. And about the z-buffer, could you expand, I'm learning OpenGL and the more explaining the better!

  4. #4
    Crazy Fool Perspective's Avatar
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    Add the following to your initialization routine.

    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LEQUAL);

  5. #5
    The Right Honourable psychopath's Avatar
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    It might not matter that much at this point, but for future reference, try calling you're glBegin once at the beginning of ALL the triangles, and glEnd and the end of ALL the triangles. Calling them for each face will eventually slow you down.

    -psychopath
    Memorial University of Newfoundland
    Computer Science

    Mac and OpenGL evangelist.

  6. #6
    Hi ay_okay's Avatar
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    Thanks guys, I'll try the commands at initialization. I'm not at my computer right now but I'll post back if it works or not.

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