[ODE] Collision response for symetrical tri-meshes

[Flavien Brebion]

Quick, but fundamental question. Is ODE supposed to work "as is" for 
tri-meshes that have a symetry "applied" to the rotation matrix, as a 
scale ( like (-1, 1, 1) ) ?

Spheres vs symetrical tri-mesh seems to work fine, but box vs sym 
tri-mesh are causing invalid collision responses; i haven't checked, but 
i suspect the normal at the contact point to be inverted. There's 
nothing in the doc saying that a sym tri-mesh is invalid. I'm still 
using ODE 0.5. Would it be fixed in 0.6 ? or is there a simple fix i can 
add to the tri-mesh code ?

Thanks,

F. Brebion