[ODE] Initial conditions problem

[Peter Yamamoto]

FYI My problems were on the user side, not ode side.

I was calculating input values and expected values and they didn't seem
to be jiving with the ode simulation... because of bugs in the
calculations!-P 

It's not necessarily the issue of what to feed ODE as long as it's clear
what needs to be converted/how.

Force + stepsize/duration aren't as intuitive parameters as an initial
velocity when trying to hit something/make simple
calculations/predictions.

Peter
-----Original Message-----
From: ode-bounces at q12.org [mailto:ode-bounces at q12.org] On Behalf Of
Marco Grubert
Sent: Wednesday, December 07, 2005 4:24 PM
To: Thomas Paviot; ode at q12.org
Subject: Re: [ODE] Initial conditions problem

ODE is all about forces / acceleration. Directly feeding it velocities
can be done but is considered bad practice and can lead to
instabilities. The alternative to impulse movement is applying a huge
force for a brief duration, but that can also mess things up. Thus the
best approach: apply a medium force over a period of time until your
projectile reaches the desired velocity.

- Marco Grubert 

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