In the realm of computer science, we're always told to pursue what is the most efficient solution. This can be either what is the fastest way to solve a problem; or what may be the cheapest. What is the easiest, but not always the best, is typically a "greedy algorithm"; think bubble sort. More often than not, there is a much more efficient method which typically involves thinking about the problem a bit deeper. These are often the analytical solutions. Whilst working on PSRayTracing (PSRT), I w...