In article <3d99e14d@news.povray.org>, slm### [at] slimelandcom says...
> >   #declare V = 0.9*V;
> 
> 
> This is physically accurate.

Only for relatively slow speeds.

Also "0.9" is not really a constant, but should be a function of the mass 
of the object, its geometry and the time-interval of course.

so "#declare V = V * (1 - delta_t * k/m)" would be better.

Lutz-Peter

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