"Fernando Gonzalez del Cueto" <fgd### [at] hotmailcom> wrote in
news:3f918037$1@news.povray.org: 

> Cool... I liked how you managed to simulate correctly the rotation of
> the balls.

Thanks.  The simulation calculates the angular velocities based on the 
collision normals.  That wasn't too difficult.  However, incrementally 
rotating the Povray spheres from these velocities was a big challenge, I 
initially didn't expect it to be.  I spent most of my time figuring out how 
to use quaternion math to manage this after wasting a lot of time trying to 
do it with standard Povray.

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