Peter Shirley's Raytracing in a Weekend

I may have to abort my raytracing app that’s been busy rendering the Stanford Dragon for over a month now! Peter Shirley’s raytracing books may help me learn how to do it properly. :) In celebration of the launch of @nvidia Turing ray tracing hardware, I am making my three ray tracing books are available as free pdfs. I have donated half the money people have sent to @hackthehood, a really neat organization.
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