[ODE] Machine to fast and a possible bug?

[Geoff Carlton]

I'm not sure about the bugs, but as for the sphere stacking, I noticed 
that just yesterday myself, and my immediate reaction was, cool!

When you look at a stack of spheres that are mathematically positioned 
on atop the other, in the absense of wind, imperfections in the spheres 
themselves, etc, they would actually stack like that.  I'm impressed 
that it works for ode, I expected slight jitters to cause them to fall 
over.  Certainly last time I stacked boxes on a trimesh, they jittered 
and fell over, which was somewhat disappointing.

Now if you want a system with random jitters, you're in luck.  Try this: 
Spawn them slightly off position +-0.0001, give them a tiny bit of 
velocity, simulate a subtle wind with a tiny horizontal force, or just 
plain poke the contact results a bit, etc.  Or perhaps if ode is too 
accurate, introduce an ode patch that adds random noise to each contact? ;-)

Geoff