By the way, if you really want to have all sorts of info about the photon
mapping in UVPov, download the PostScript file linked from
http://nathan.kopp.com/photons.htm.  That PS file is the paper that I wrote
for my directed study, and it probably contains more info than you want or
need.  It lacks tips and tricks, because I did not know of many tips or
tricks when I wrote the paper.

-Nathan

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