[ODE] Trimesh vs Convex Hull

[Andy O'Neil]

Hi,
 
There already is Bullet support in ODE in the main (old) branch, Erwin
Coumans added it quite a while ago, but it never made it over to any other
branches. 
 
http://cvs.sourceforge.net/viewcvs.py/opende/ode/ode/src/
 
I've used ODE with Bullet and I can confirm that it works. I ran into a
couple of issues, such as the collision pair cache being a static global in
the BulletODECollide lib. If you link this against the ODE .dll, then link
it as a lib against your project, you'll get some issues when invalidating
Bullet geoms. I dealt with this by building Bullet / BulletODECollide / ODE
all as libraries.
 
Also, I believe that Bullet is more focused on techniques than performance,
so that might be an issue for some users. Things might have changed recently
on this front however, so take that statement with a pinch of salt.
 
Andy
 
________________________________

From: ode-bounces at q12.org [mailto:ode-bounces at q12.org] On Behalf Of Nguyen
Binh
Sent: Friday, March 31, 2006 6:58 AM
To: Mohsin Hasan
Cc: ode at q12.org
Subject: Re: [ODE] Trimesh vs Convex Hull


I 'd doubt it.
Anyway, Bullet has a good implelementation of GJK algorithm so it supports
convex shape.
It would be nice if we couple Bullet in ODE.



On 3/31/06, Mohsin Hasan <mohsin.hasan at trivor.com> wrote: 

	I'm not sure if this has been discussed earlier but wouldn't it be
great if ODE natively supported a ConvexHull primitive. It would give better
collision representation of a mesh compared to simple primitives besides
being more efficient and accurate in terms of detecting collision compared
to Trimesh. Does anyone else also think that they are more important than
Trimesh/Trimesh. 

	 

	If supporting ConvexHull is not possible for whatever reason, is it
possible to do something similar using Trimesh? I mean if we can generate a
convex hull of our geometry through whatever way and pass it as Trimesh to
ODE, is Trimesh-Trimesh collisions for convex hull meshes accurate? 

	 

	Mohsin

	------

	See tech demos of our engine supporting ODE based Physics at
http://www.itrango.com/demo.html 

	 


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-- 
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Binh Nguyen
Computer Science Department
Rensselaer Polytechnic Institute
Troy, NY, 12180
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