Re: [cgkit-user] moving a static object?

[Ricardo K. <ric...@gm...>]

Thank you for your answer, Matthias. Actually yes, my computer is an
AMD Athlon Thunderbird 800Mhz, and the other computers I tried where
Intel (or at least I think so).

One of the other machines had windows, and although I have done
nothing explicitely with DirectX (I actually haven't written a line of
code regarding rendering, I leave all that to the viewer tool :-)),
maybe in the windows machine, it falls back to DirectX when it cannot
work with OpenGL?

What is the matter between Intel and AMD with ode/cgkit?

Again, thanks for the help

ricardo

On 7/7/06, Matthias Baas <ba...@ir...> wrote:
> Ricardo Kirkner wrote:
> > errors, I am not quite sure how to avoid this kind of behavior. It
> > basically has to do with the computers speed. On my machine (which is
> > the slower of all I have tested), the simulation works more or less as
> > I expect (probably because I am developing on my machine, and
> > therefore tune the simulation to fit it). On other machines (which are
> > faster), the simulation behaves rather oddly, by my robot making
> > jumps, or spinning at great speed (which I have never seen done on my
> > machine). I believe this has to do with the simulation state getting
> > updated quickier and therefore more often, and thus building momentum
> > (which on my computer is not happening because due to the lower speed,
> > the forces applied get enough time to settle down).
>
> Have you modified something in cgkit that manipulates the time step that
> is passed to ODE? If not, then different CPU speeds shouldn't matter.
> The time step that is passed to ODE isn't based on the real time that
> has passed, it is only based on the framerate you have requested. So a
> faster CPU should just provide the simulation results faster than the
> slower CPU but the results shouldn't differ.
>
> What CPUs do your computers have? Maybe one is an Intel and the other an
> AMD which might already be the cause for your problem. Is there some
> DirectX code involved on one machine? (Direct3D changes the FPU state)
>
> Maybe you can set up a simple scene (probably just a box falling on a
> plane) that prints the position/orientation values for a couple of
> frames so that you can compare when they start to diverge...?
>
> - Matthias -
>
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