Chapter 3 mental ray ® and lights 3.1 Introduction You are now in charge of a large benevolent creature, and that creature's name is mental ray ® . One of your primary functions in the care of this creature is to make sure that it is fed properly, so you might ask what this creature must be fed to keep it happy. The answer is simple: Light. To keep your friend mental ray happy, you need to feed it constantly with exactly the right quality and quantity of light; otherwise, you'll find that it just won't respond well to any of the other things that you feed it, such