"David Buck" <dav### [at] simberoncom> wrote in message
news:3BFDC294.84DA994C@simberon.com...
> > Today in the morning I implemented a routine for particle interaction
but
> > bizarre things began to appear, so I took it out. Maybe today I'll try
to do
> > it again.
>
> What happened that was so bizarre?  Are you using Euler's method for the
> simulation (i.e., add a little acceleration to the velocity and add a
> little
> velocity to the position)?  This may cause the system to gain energy. Is
> that
> what's happening?

Yes, I'm using that method. I didn't know it was Euler's! But the problem
with my interaction routing wasn't really that: I had mistaken the position
vector for the velocity vector!!! :)

I left 3 computers rendering the animation overnight, and it still hasn't
finished! Now I learn that adding reflection to an animation has its
price!!! :)

I hope I can post the result in a few hours.

Fernando.

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