[ODE] Objects getting stuck with tri-mesh

[Flavien Brebion]

A smaller timestep won't fix it, it will just make it
less likely to happen. It will also increase the CPU
work.

Extending the box depth: not possible in my case,
the objects would look unrealistic.

The dHeightField would fix it, but only for the
terrain. The problem would still be there for other
objects on which you can collide (mainly a road, in
my case).

F. Brebion


-----Original Message-----
From: ode-admin@q12.org [mailto:ode-admin@q12.org]On Behalf Of gl
Sent: Wednesday, September 03, 2003 5:03 AM
To: Open Dynamics Engine
Subject: Re: [ODE] Objects getting stuck with tri-mesh



Well, for one you can use a smaller timestep until you get something
workable (smaller timestep = less penetration).  Can you not extend the box
depth also?

For the ground, another option is to use my dHeightfield contribution.  It
only supports spheres currently, but it's written so each triangle acts like
the planes do - ie. you can penetrate very deep, and it will still kick you
out.

I've been trying to talk someone into adding more colliders, but so far no
luck : ).  I'll need them eventually myself, but I'm busy with other things
right now...
--
gl

----- Original Message -----
From: "Flavien Brebion" <f.brebion@vrcontext.com>
To: "Open Dynamics Engine" <ode@q12.org>
Sent: Tuesday, September 02, 2003 2:38 PM
Subject: [ODE] Objects getting stuck with tri-mesh


> I've finally found WHY i get some objects
> stuck into my scene.
>
> It's actually very easy to understand. Check this
> figure:
>
> http://www.fl-tw.com/LightSpeed/stuck.jpg
>
> If the object falls "quickly" on a pretty thin
> box (or any actual thin solid, represented as a
> tri-mesh), there will be reports of contact
> points both on the upper and under sides of the
> box -> contact forces cancel each other (or
> almost) and the object gets stuck inside the
> box.
>
> Now the question: what's a robust way to fix it?
>
> F. Brebion
>
> _______________________________________________
> ODE mailing list
> ODE@q12.org
> http://q12.org/mailman/listinfo/ode
>
>

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