"Rune" <aut### [at] runevisioncom> wrote:
> "Warp" wrote:
> > Rune wrote:
> >> Actually no, you just said "regarldess of distance", not mentioning any
> >> maximum distance at all.
> >
> >  What I said was "are you sure that shadow tests are always done with a
> > fading light regardless of distance". Or in other words, "are you sure
> > POV-Ray doesn't have a check that if a fading light source is far enough,
> > it doesn't skip doing shadow tests".
> >
> >  I don't really understand how you misunderstood what I said.
>
> I didn't misunderstand anything, but are using expressions that are not well
> defined.
>
> >> How would you define "the maximum distance the
> >> light source would have an effect from"?
> >
> >  With a simple mathematical formula. From the light source parameters
> > you can calculate what is the distance at which the effect of the light
> > source drops below negligible.
>
> You didn't answer the question, so I ask again: What is negligible? Anything
> below the ADC-bailout threshold? Or the
> floating point precision error threshold? Or the internal EPSILON threshold?
>
IMHO ADC ;-)
>
> And what if there are many light_sources close to each other, so that any
> single one is negligible at distance X, but combined their effect is
> significant?
>
these should be made area. Or you can use a lower bailout value (maybe a
light should accept the ADC_bailout keyword).
>
> Rune

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