[ODE] Pushing a Body

[Nathan Ostgard]

Ahh... thanks. Didn't realize that the force was cleared and had to be
accumulated... Works great with the dWorldImpulseToForce calculation added
over a number of frames.

*spends too long watching a box bounce around the room*

----- Original Message ----- 
From: "John DeWeese" <deweese@ict.usc.edu>
Cc: <ODE@q12.org>
Sent: Monday, May 05, 2003 2:35 AM
Subject: Re: [ODE] Pushing a Body


> Oh yeah, there's a utility function, dWorldImpulseToForce(world,
> stepsize, impulse_x, impulse_y, impulse_z, result_force). Where the
> impulse is in units of (force * time). Then you can apply the result
> force with dWorldImpulseToForce just once. Warning: super-big
> masses/forces detract from numerical precision!
>
> Eric Trousset wrote:
> > I think you should try to apply an impulse.
> > the diference between a force and an impulse is that the farce has to be
> > integreted for some amount of time before it has a visible effect
> > on the body, whereas and impulse acts as a huge force that is appied on
> > the body for a very small amount of time but gives it a lot of
> > velocity.
> >
> > Eric
> >
> >     -----Message d'origine-----
> >     *De :* Nathan Ostgard [mailto:nostgard@lvcm.com]
> >     *Envoyé :* lundi 5 mai 2003 11:09
> >     *À :* ode@q12.org
> >     *Objet :* [ODE] Pushing a Body
> >
> >     Hello,
> >
> >         I've been wanting to try to integrate ODE into an engine for a
> >     while, and just started messing around with it tonight. All of the
> >     collision and response is working great, but I can't seem to figure
> >     out one thing - how can I apply force to a body in the world to
> >     "push" it in a direction? I've gone through the mailing list and
> >     tried a million and one different ways, but I can't seem to get the
> >     object to move.
> >
> >         Specifically, I have a box object which is already at rest in
> >     the world and I just want to push it up into the air (i.e., throw
it).
> >
> >         dBodyAddForce seems to have some (but VERY little) effect on the
> >     body when it is in the air (it just bounces a little more when it
> >     lands), but once it's landed on my ground plane, it has no visible
> >     effect on the body whatsoever.
> >
> >         Any ideas?
> >
> >         Thanks,
> >
> >     Nathan Ostgard
> >     nostgard@lvcm.com <mailto:nostgard@lvcm.com>
> >
>
>
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