The author writes in the link: > Note that the goal here was to make the source code as small as possible, not clarity; so even the original code before mini

The author writes in the link: > Note that the goal here was to make the source code as small as possible, not clarity; so even the original code before minification is a horrible mess. This doesn’t do justice to the elegance and simplicity of proper raytracer code; I’m writing a book to right this wrong.