[ODE] Collision: number of intersection points

Megan Fox shalinor at gmail.com
Fri Feb 11 09:32:19 MST 2005

Remember that ODE is working with perfect spheres, so if you imagine a
non-penetrating collision between an infinite plane and a perfect
sphere, you'll see it has exactly one point of contact, infinitely

If you're not getting enough traction, then why not ramp up the
friction of contact joints generated between your wheels and the
ground?  (make sure you're using the Friction Pyramid Approximation
friction, which is not the default friction model)

-Megan Fox

On Fri, 11 Feb 2005 12:29:12 +0100, Thomas Thueer <ode at thoemsen.ch> wrote:
> Hi
> I have a question regarding the number of points returned by dCollide(....).
> - It surprises me that the collision of a sphere with a flat surface has
> only one single point of intersection in ODE, whereas I'd assume that
> you need several points to describe such an intersection (of circular
> form). Can anyone tell me something about this?
> - Actually, my problem is that I do not get enough traction between
> wheels and ground. So I thought if there were more contact points, I
> could create more contact joints, which would then increase the traction
> (like having wider wheels on a car increases friction). Could this be a
> solution or does rigid body simulation work non-intuitive with respect
> to this problem?
> Any help would be highly appreciated. Thanks.
> Thomas
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