Re: [Pyode-user] Collision detection works fine in one direction, but not the other

[Ethan Glasser-C. <gl...@cs...>]

Leo Rocha wrote:
> On Mon, Aug 17, 2009 at 7:28 PM, George<pin...@gm...> wrote:
>> Well, I think I found the solution. The plane defines a ground-like
>> object and not a paper-like infinitely thin surface as we're used to
>> from math. So when the top_rail is used, the simulation assumes the
>> ball is inside that ground object and goes crazy.
> 
> Hae you thought about that the surfaces are orientable (mathematical
> analysis) and that the vector is different from one side and the
> other? that is why acts like if it is solid in one side and a surface
> in the other.

That said, I think it does behave like George says in the sense that it
isn't infinitely thin, but instead infinitely deep. That's why it shoots
up so fast at t=0, even when there's no force on it.

Ethan