"Andrew Coppin" <orp### [at] btinternetcom> wrote in
news:3d94b015@news.povray.org: 

> As I say, it's all in the bounce. I've been fiddling with the height
> ratio for ages... Too low and the ball bounces once and it's over. Too
> high and the ball actually bounces *heigher* each time! 8-0 And as I
> said, when the ball stops bouncing, the macro kinda goes wrong (it only
> calculates one bounce per frame, and starts being a bit random... maybe
> I need to put in an artificial smoothing term or something...)
> 
> The acceleration of the ball should be exactly 8.9006m/s^2 (if the
> animation actually plays back at 25fps, and you assume the ball is 1
> meter across). The bouncing part probably isn't very realistically
> simulated - to be honest, I don't know much about the physics of
> bouncing! 

Your ball is a bit too rigid, you should scale it slightly when it touches 
the ground... Squash and stretch are the basis of good animation (cartoon 
ones, at least :-)

Just to complicate a bit your macros :-P

-- 
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Philippe Lhoste (Paris -- France)
Professional programmer and amateur artist
http://jove.prohosting.com/~philho/

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