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

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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