[ODE] Making simulation speed independant from computer speed
hplus-ode at mindcontrol.org
Wed Nov 10 16:35:33 MST 2004
> My first question is : what is the unit of the stepsize ?
ODE uses whatever CONSISTENT unit system you want. The three basic
units are distance, time, and mass. If you want distance to be furlongs
and mass to be stone, then the actual time unit used can be derived
If you use SI units, then the unit of WorldStep is seconds, an mass is
kilograms, and distance is meters (so velocity is meters per second).
> My second : what kind of calcul should I do to make the simulation speed
> being the same on others computers, for example if I get the time
> elapsed in millisecond.
It's usually a bad idea to use variable time steps. Instead, you should
run more time steps in succession if you find more time has elapsed.
If you vary the time step size, your simulations will not be as stable
as with a fixed time step.
See http://www.mindcontrol.org/~hplus/graphics/game_loop.html for more.
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