http://wiki.povray.org/content/Reference:Union#Split_Union

OK ... narrative says it's used with photons, but made a typo and 
accidentally enabled on a tile floor (many tiles and grout) but I wasn't 
using photons. The object count went down like expected, but render time 
slowed to a crawl ... walked away from computer, and the usual 3 minute 
render had only managed to get almost through the first row. Like I said 
a mistake, and can't off the top of my head think of any use of 
split_union /without/ photons ... could it be that split_union should 
first check for photon usage then ignore the "on" setting if photons 
aren't used?

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