[ODE] Trimesh problem?

[james at 6msoft.com]

Thing is, it seems to handles sharp regions in the terrain perfectly, its
the nice round trees its freaking out on. In fact, the only time I have
been able to penetrate the terrain is when drop my vehicle from like a
kilometer above the ground or something (which is totally unrealistic for
game-play anyways), but the trees I can go into at almost idle speed and
it causes serious issues, its not like I'm traveling half my chassis size
per frame or anything.

Right now I'm thinking I might just end up putting boxes or something
around the trunks of the trees, which won't be the most realistic, and
will require that I either add collision geometry support into my model
editor (which would waste valuable time), or just hack it (which I
wouldn't enjoy).

BTW, thanks for the speedy reply.

-James

>
> Sounds like you'll have to put primitive collision hulls around regions.
> I can't think of any really elegant approach otherwise.  Note that it
> might be possible to quickly cook up an automated solution - that could
> scan your geometry and place hulls around any sharp discontinuities in
> your terrain.
>
>  - a
>
>
> On Thu, 9 Oct 2003 james at 6msoft.com wrote:
>
>> Hi,
>>
>> Right now I am feeding my world into ODE in one giant mesh (which seems
>> to
>> be the fastest way), except for static objects like trees and rocks
>> which
>> are part of the same geometry group. Vehicles can navigate the world
>> perfectly, but when they encounter a static object, like a tree, things
>> get a little hairy. Even at low speeds, collision with a tree usually
>> results in me getting stuck inside the tree, getting driven into the
>> ground, and so forth. Even on jagged spikes in the world I don't have
>> anything like this. The trees are  pretty thick too, its not like I am
>> trying to collide with a fence post or something. I was just wondering
>> if
>> anyone else has encountered anything similar.
>>
>> Should I be combining the world mesh with the static meshes or something
>> for ODE? Am I just going to have to put bounding boxes around areas I
>> want
>> collidable? Is there some accuracy values I should be setting?
>>
>> -James
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>
>