[ODE] more air friction

[Jon Watte]

That would be true if ODE used a higher-order integrator. However, ODE uses a first-order forward Euler integrator, so this is the best you can get. This is why people recommend small time steps (on the order of 0.01 seconds; I use 1.0/60 seconds and that works OK).

A fixed time step is even more important than a small time step, by the way.

Cheers,

			/ h+


-----Original Message-----
From: ode-bounces at q12.org [mailto:ode-bounces at q12.org]On Behalf Of Ivan
Bolcina
Sent: Saturday, April 24, 2004 11:38 AM
To: ode at q12.org
Subject: Re: [ODE] more air friction



Another thing on air friction.
If I calculate the force that friction produces on a current moment with 
current speed, then this is only current air friction force.
If I then run simulation for a given dt, now this force applies for all 
dt. But air friction force should be diferent at,for example 0.5dt, 
since it has already 0.5dt time to slow down object.
So I should pass to ODE not constant force, but rather formula of air 
friction. or should I canculate avarage airfiction force, which applies 
for all dt, not just current time.


bye, ivan


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