[ODE] TriMesh ok with one index, another ordering for index makescollisions unstable

[John Miles]

Right.  TriMesh triangle vertices need to be defined in counterclockwise
order relative to the side you want to appear "solid."

The triangles *themselves* can be defined in any order, but the same is not
true of the index triplets for individual triangles.


-- jm

> -----Original Message-----
> From: ode-bounces at q12.org [mailto:ode-bounces at q12.org]On Behalf Of Bob
> Cober
> Sent: Saturday, February 07, 2004 11:00 PM
> To: ode at q12.org
> Subject: Re: [ODE] TriMesh ok with one index, another ordering for index
> makescollisions unstable
>
>
> I think the order of the vertices(clockwise or counter-clockwise) that
> make up a triangle does have an effect on the TriMesh collisions.  My
> experience was that the collision takes the normal of the triangle into
> account - similar to the way OpenGL calculates one-sided lighting.
>
> I think the "explode" you are seeing is when the body collides and hits
> an inward pointing normal, then the collision adds to the penetration
> velocity.
>
> I will post more if I learn more......
>
>
>
> Jani Laakso wrote:
>
> > I was under impression that TriMesh "soup" does not require any
> > special ordering (like GL strips,fans), is this so?
> >
>