> You need to understand the difference between a ray and a ray ;-)  There
are
> two kinds of rays: Lets call them mathematical rays and physical rays.
SNIP the Explanation

Thanks very much. Why can't you just save one intersection and then, for
every new intersection, just replace the stored one when it is closer? Too
much calculation? But that has to be done in any case...

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
Email: tim.nikias (@) nolights.de

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