[ODE] Trimesh-Sphere inaccuracies

[Marco Grubert]

Thank you for the feedback. After some more hours of stepping through the 
code it indeed appears to be a problem with edge crossings and not with the 
size of the triangles. However, I have been unable to determine exactly what 
goes wrong in these cases since the contacts don't look all that different 
from regular ones. Yet the solver generates a larger correction force which 
leads the wheels to bounce up a little more. Do this with a highly 
tesselated mesh and you get a very bouncy car.

Regards,
  Marco

----- Original Message ----- 
From: <ekt at libero.it>
To: "mgrubert" <mgrubert at conitec.net>
Cc: "ode" <ode at q12.org>
Sent: Thursday, July 07, 2005 03:07
Subject: Re:[ODE] Trimesh-Sphere inaccuracies


i had the same problem in the past. someone said that
there should be no difference with small or big tris, so it
was probabily a bug. my solution has been to find a good tris
average size (wich in my case is 3-5 unit per tris, ymmv)

another problem i've found is that, at low timestep (0.01)
a rolling sphere over a trimesh 'jumps' when crosses the edge
shared by two tris. probabily related to contact generated.
timestep=0.005 solved the problem.

hth



---------- Initial Header -----------

>From      : ode-bounces at q12.org
To          : ode at q12.org
Cc          :
Date      : Wed, 6 Jul 2005 12:32:50 -0700
Subject : [ODE] Trimesh-Sphere inaccuracies

> Hello,
>
> in a car simulation I have 4 wheels (spheres) drive over a planar mesh. 
> The




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