Global Illumination and Shader Engine

I don't think putting theory and code in a video is the best way to start a discussion. Why not provide a PDF and/or use pastebin. You can also put code here with BBCode.

Also: Put your theory to the test with a implementation (and produce some nice screenshots ). By the way: Although it will involve some work, research in approximating physically based rendering/global illumination usually compare to so-called ground truth, i.e. to a rendering with a raytracer/pathtracer and do diff image (or provide PSNR).

For the love of everything that's holy for you, don't use exceptions to handle hash collisions.