[ODE] cylinder plane bug

[gl]

> I tend to agree with Bram. A plane is an infinitely thin, infinitely wide 
> and
> long part of 3D space. As such, it has no volume, and therefore the only 
> way to
> collide with it is to touch it (i.e. a solid can't be "inside" a plane).

I disagree, a plane seperates space into 'inside' and 'outside'.  As such 
any penetration with the inside half-space should be considered as such. 
This is a desireable property for collision, particularly when you don't 
have swept volumes that would spot tunelling otherwise.
--
gl