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In article <3cf223fa$1@news.povray.org>, Tin### [at] hotmail com
says...
> When an object collides at angle, only the portion of energy perpendicular
> to the collision vector has an effect,
Energy can't be perpendicular to anything, because it isn't a vector.
What you mean is velocity.
The reason why a ball loses energy is because of friction inside it, and
the amount of friction is dependent on the deformation, wich is dependent
on the acceleration/change of velocity.
Probably this friction mainly (maybe only) slows down the velocity
perpendicular to the surface, but if the ball has a velocity-component
parallel to the surface it will slide (or roll) on it while in contact
with it, resulting in friction between the surface and the ball wich
slows it down in this direction, too.
How about letting the user specify the ratio between horizontal and
vertical friction?
Lutz-Peter
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