Well, every primitive probably has it's own limit (cone is extremely sturdy,
as I recall) and it might vary from system to system too but I wouldn't know
if so.
If you weren't looking to do anything but to document a generalization you
could just say very large or very small numbers lead to difficulties in
visiblity or appearance.
BTW, I think light_sources have or had a distance limitation too.  Too low
color values for lights isn't limited anymore though, I think, thanks to
Nathan Kopp.
Extreme camera 'angle' or 'direction' (and distance?) also has an effect on
things.
--
text{ttf"arial","bob h",.1,0pigment{rgb 9}translate<-1,-.2,3>}

"ingo" <ing### [at] homenl> wrote in message
news:Xns### [at] povrayorg...
> in news:3c0a2f0d@news.povray.org Warp wrote:
>
> >   Perhaps the documentation should mention these kind of
> >   limitations so that people could be aware of them.
>
> What more limitations are there, what is their value and are they
> system dependent?

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