What are some of the better open source raytracers? [closed]

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I'm just wondering what options are out there as far as open source ray tracing software. eg. Yafaray, POV-Ray, what else? Any opinions on their relative merits would also be appreciated.

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http://mantawiki.sci.utah.edu/manta/Main_Page: It's interactive!

http://www.pbrt.org/: It has a book!

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POV-Ray is in my opinion the best open source general purpose raytracer you will find. Unless you're looking for a specific feature unavailable in POV-Ray, I can't see any reason why you wouldn't use that.