Still one hell of an anim and you make me wanna go dive right into POV-ray
again (unfortunately I have more important things at hand for the comming
month)

/~\nne

"Alain" <noe### [at] onca> wrote in message
news:Xns### [at] 204213191226...
> "Andrew Wilcox" <awi### [at] unpuzzledcom> wrote in
> news:3ff5a0d6@news.povray.org:
>
> >> Some of the columns of marbles appear to vibrate: they seem to go up
> >> and down slightly, even before anything hits them.
> >
> > It's probably because the step size is too big, and this particular
> > non-common setup of the spheres.   All the spheres in the column fall
> > in gravity in one step, but do not interact to correct the fall until
> > the next step.  So they fall, correct, fall, correct, thus vibrate.
> > Plus the problem is probably magnified since we have several spheres
> > stacked one on top of the other all adding to the end result.
>
> Quite right Andrew.  The sim. step size I used was not much higher than
the
> frame step.  If I recall correctly, frames were 120 per second, sim steps
> were 1/200 seconds apart.  I should have at least doubled the sim steps.

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