[ODE] Should trimeshes react to physics?

[Nguyen Binh]

There are two types of trimesh in ODE right now:
+ Static trimesh = Quite good.
+ Moving trimesh = no where near usable, but frankly speaking, there are no
direct movable trimesh support exist atm. Because doing collision response
with arbitrary trimesh is somewhat too hard (maybe nearly undefined). But
you can use convex trimesh. So unless ODE has convex set, we won't see
moving trimesh around. I'd suggest you use Bullet library @
http://www.continuousphysics.com .

On 11/21/05, Keith Wiley <kwiley at cs.unm.edu> wrote:
>
> I'm trying to understand trimesh roles in ODE. I realize that,
> according to the docs, they are new and not fully developed. I am
> using one massive trimesh for a nonoverlapping extruded terrain right
> now. One thing I have noticed is that the trimesh is unaffect by
> gravity. If I create the entire terrain at some height up in the
> air, it doesn't fall down, it just floats permanently in space, even
> though other objects are rolling and crashing around on the top
> surface of the terrain, so it must clearly be enabled due to all the
> collisions it is experiencing.
>
> Likewise, since a trimesh is infinitely thin, I'm curious how mass
> works with respect to trimeshes.
>
> There is an option to precalculate the face normals for a trimesh and
> give them to the trimesh building routine. When should this be used
> and when shouldn't it be used?
>
> And lastly, there is a brief mention of temporal coherence, which as
> I understand it, reduces overall collision checks by assuming that
> objects don't move very far between adjacent timesteps. So, it
> sounds like a good idea. When would it *not* be a good idea to use?
>
> Thanks.
>
> ________________________________________________________________________
> Keith Wiley kwiley at cs.unm.edu http://www.unm.edu/~keithw
>
> "Luminous beings are we, not this crude matter."
> -- Yoda
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--
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Binh Nguyen
Computer Science Department
Rensselaer Polytechnic Institute
Troy, NY, 12180
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