[iak8god]

This explains and demonstrates, piece by piece, how a ray tracer works it's a "breakdown" in the sense of "an explanatory analysis", not in the sense of "a failure."

Good for you that you already know how ray tracers work, and so possibly this adds no value for you. I already knew how they work and I thought it was a nice clear demonstration.

[Doerge]

I see that it is a _nice_ demo, but don't see how this ends up as #1 here?

[iak8god]

Other people found it interesting. It's pointless to complain about content that doesn't strike your fancy. Just upvote stuff that does...

[roywiggins]

Because it's by Ken Perlin, probably.