[ODE] splitting the world in multiple trimeshes

[Pancini, Ettore]

Hi Jan,

> This is strange isn't it? Wouldn't it be better to have some 
> almost 0 thin hole between them?
in this case i need to create two different art assets. 
wich i would like to avoid. right now i just have one geometry 
set: the one i use for rendering. i then take this tri soups,
optimize co-planar faces and build the ode trimesh

 
> Well how many contact points do you generate?
max contacts? 32

> same problem as the first one? On link between A and B you 
> will generate 
> two "same" contact points one with A and one with B. So ode 
> will apply forces twice, 
yes. good idea. i'll monitor how many contact points and purge
one if i have collision both on trimesh A and B. thanks for this!