"Bill Pragnell" <bil### [at] hotmailcom> schreef in bericht
news:web.44686c92293b371731f01d10@news.povray.org...
>
> Actually, the third image is a double-pass render, the reasons for which
may
> be interesting to some. You should be able to see (from reflections, etc)
> that there is glass in all the openings. I found that using radiosity with
> the glass darkened the whole image considerably, because the radiosity
> samples destined for the sky were being intercepted by the glass panes.
> Using a first pass without glass corrected this to some extent, although
> obviously supplementary samples will again be intercepted. Does anyone
know
> of another way to avoid this problem? Hopefully I'm missing something
> bleedin' obvious... :)
>

Yes, the double pass like you describe it,  is the best way to go about it.
I learned that from Tim Nikias's "Windows Room" which was the basis for my
ice age scene last year.

Thomas

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