[gameprogrammer] Re: newb openGL q: positioning multiple objects

On Sun, 5 Jul 2009 20:41:02 +0100
Richard Sabbarton <richard.sabbarton@xxxxxxxxx> wrote:

> Hi Ethan,
> 
> Check out line 223...
>      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
> 
> This will blank the screen each time...
> 
> You should call this once before you begin rendering your scene...
> 
> It looks like you are rendering multiple cubes but clearing the buffer
> before each one.
> 
> Hope this helps.
> 
> Rich

That did help, thank you.

> 
> 
> 
> 2009/7/5 Ethan Grammatikidis <eekee57@xxxxxxxxxxx>:
> > On Sun, 5 Jul 2009 02:47:55 +0100
> > Ethan Grammatikidis <eekee57@xxxxxxxxxxx> wrote:
> >
> >> Hi, I'm just starting out with OpenGL on a Linux box. I've been working 
> >> through an old O'Rielly tutorial creating a spinning cube,[1] and thought 
> >> I could modify the program to display multiple cubes, but no matter what I 
> >> do I only get one or zero cubes.
> >>
> >> [1] 
> >> http://www.oreillynet.com/pub/a/network/2000/06/23/magazine/opengl_build.html?page=2
> >>
> >> It's GLUT-based with a cbRenderScene() callback which originally contained 
> >> all the drawing code for the cube and the HUD-like text. I rearranged 
> >> cbRenderScene() so that it calls my functions, do_objects() and do_hud(). 
> >> do_objects calls obj_spinning_cube() twice, passing different positions 
> >> each time. obj_spinning_cube() passes this position (a struct with x, y, 
> >> z) to glTranslatef() immediately after calling glLoadIdentity().
> >>
> >> I only see one spinning cube, corresponding to the second call to 
> >> obj_spinning_cube(). I can see the first cube if I disable that second 
> >> call. I wonder if I'm misunderstanding glLoadIdentity()?
> >
> > I forgot to link my code:
> >
> > http://sprunge.us/NZNc?c
> >
> > and a 3-line header (position struct):
> >
> > http://sprunge.us/VGDc?c
> >
> > --
> > Ethan Grammatikidis
> >
> > Those who are slower at parsing information must
> > necessarily be faster at problem-solving.
> >
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> >
> >
> >
> 
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> 


-- 
Ethan Grammatikidis

Those who are slower at parsing information must
necessarily be faster at problem-solving.

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