Guys, life took over as always, and part III of the raytracing series is gonna take a bit longer than expected (quite a bit longer...). So, in the mean time, you can probably check out some links. For example, take a look at
this great article. It's one of the best making-of I've ever seen, for
Applied Mediocrity, Kakiarts' intro.
Otherwise, you can always drop your jaw on the latest astounding 256-bytes intro by Rrrola:
Puls.
The tunnel will be back in a second... almost...