The first book on the topic, "An Introduction to Ray Tracing," is now free to download from the link below.
http://www.realtimerendering.com/blog/an-introduction-to-ray-tracing-is-now-free-for-download/
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stig atle (stigatle@diasporapod.no)'s status on Thursday, 24-Jan-2019 14:24:28 EST stig atle