I recently came across Paul Heckbert’s business card raytracer. For those that have never heard of it: It is a very famous challenge in the Computer Graphics field that started on May 4th, 1984 via a post on
comp.graphicsby Paul Heckbert ( More about this in his article "A Minimal Ray Tracer" from the book Graphics Gems IV).
The goal was to produce the source code for a raytracer...that would fit on the back of a business card.
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