"Rune" <run### [at] mobilixnetdk> wrote in message
news:3cf200ad@news.povray.org...
> So far in my particle system I have used a simple collision model where
> the outcoming angle is equal to the incoming angle and the outcoming
> velocity is smaller than the incoming velocity due to the energy loss at
> the collision. ( See my illustration I in povray.binaries.images in the
> message "Collision with energy loss" ) But I wonder if that is a very
> good model to use...

When an object collides at angle, only the portion of energy perpendicular
to the collision vector has an effect, while the portion parallel has no
effect (discounting friction, but that can easily be applied if so desired)

The best way to do this is to split your equations into x, y and z vectors,
do your conservation and then do your conservation of energy equation and
then use the resulting vectors.

I don't have the equations and such off hand right now but I can get them
later if you would like.

-tgq

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