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Since you didn't give a link, is it this one ? http://fabiensanglard.net/rayTracing_back_of_business_card/index.php http://fabiensanglard.net/rayTracing_back_o

• dr_zoidberg 10y ago
  Yes, that was the one -- I was a bit distracted and didn't notice that I didn't include the link. Can't edit my comment now.