Ray mapping inn C++

Hello guys,
Please I can anyone give me suggestion on good e-books or video tutorials, etc where I can learn Ray mapping in C++? I need to learn it for my academic project.

Thanks in advance!
Povray's been around forever. It might be worth checking out their code.
@kbw Thanks a million. Sorry I didn't acknowledge this on time. I just got to see your response. I have check the link and I am grateful. Thanks.
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