[ODE] Non-deterministic behavior

[Flavien Brebion]

Are time steps constant or framerate dependant?

F. Brebion


-----Original Message-----
From: ode-admin@q12.org [mailto:ode-admin@q12.org]On Behalf Of Josh
Welber
Sent: dimanche 24 aout 2003 16:17
To: ode@q12.org
Subject: [ODE] Non-deterministic behavior


Does anyone have experience with ODE giving non-deterministic
results?  What I mean is specifically this:  We have a simulation where you
shoot a ball out over a terrain and it starts rolling from there.  The only
user input is the direction/spin/force that the ball is launched with --
and all these are set with discrete controls. The collisions in this case
are all between spheres and triMesh.  We have found that the ball does not
in a deterministic manner -- but rather bounces oddly sometimes, sometimes
acts as expected.  This is sometimes worse if there is friction in the
collision contact, but even for frictionless collisions it still reacts in
a non-deterministic way.  Does anyone have any ideas about this one, seen
this behavior themselves?  I saw the posting regarding friction causing
unexpected results -- this is a different problem.

thanks



Josh Welber
partner/tech wrangler
Large Animal Games
http://www.largeanimal.com
t: 212.989.4312
f: 305.489.5790


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