Not a Number (was [ODE] 2d physics, and possibly unrelated confusedness.)

[DjArcas]

Watching the position and velocity of the objects - they all go to 'NOT A
NUMBER' - what could be causing that? (ie is it a bug inside ODE, or am I
doing something bad... I don't think I am tho!)



----- Original Message -----
From: "DjA" <djarcas@hotmail.com>
To: <ode@q12.org>
Sent: Wednesday, May 21, 2003 10:27 AM
Subject: Re: [ODE] 2d physics, and possibly unrelated confusedness.


> Ah, that worked (pretty much) excellently, thank you very much.
>
> However, it has thrown light on another problem - not sure if it's
related.
> It's certainly something to do with my creation of contact points and the
> callback procedure, I'm sure. Essentially, if I have softCFM and softERP,
> then the objects can intersect by quite some margin - one object is a
> powered 'spaceship', and if I try, it can completely enter any other
> object - if it gets far enough in, then the physics go crazy, with objects
> moving at silly speeds around (and off) the screen. (My 'world' is
> surrounded by planes at the screen edges, and objects just seem to get
> wedged in the corners there)
>
> I've tried making softer, bouncier contacts, but then a plane seems to act
> as water - an object sinks waaaay in, then accelerates and bounces out. If
I
> make much harder contacts, then it seems ok - but if a small box gently
> lands on top of a larger box, then the big box will wobble slightly, then
> flick the little box off at great speeds. Also, if I try hard enough, I
can
> get it to go crazy and move at great speeds to get wedged in the
corners...
> again. :)
>
> All my objects have a mass of roughly 1 unit per unit cubed. My time step
is
> 1/60 (As an aside - this isn't documented what it's supposd to be - I just
> assumed that 1.0 = 1.0 seconds), and my gravity is 98.10 (otherwise
objects
> just seem to soar)
>
> Does anyone have any ideas where I might start looking to solve these
> issues?
>
> ----- Original Message -----
> From: <psero@gmx.de>
> To: <ode@q12.org>
> Sent: Saturday, May 17, 2003 7:36 PM
> Subject: [ODE] 2d physics
>
>
> > Hi--
> >
> > to simulate 2d physics I made a 'Plane2D' joint type for ODE:
> >
> > http://www.mathematik.uni-bielefeld.de/~pserocka/ODE-Plane2D/
> >
> > For usage and installation see Plane2D.README,
> > the code can be found in Plane2D.tar.
> >
> > Peter
> >
> > --
> > +++ GMX - Mail, Messaging & more  http://www.gmx.net +++
> > Bitte lächeln! Fotogalerie online mit GMX ohne eigene Homepage!
> >
> > _______________________________________________
> > ODE mailing list
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> >
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