/ light

Well, duh...

From "Advanced Global Illumination", first edition:

The field of optics stayed mostly dormant during the dark ages...

Like, duh. In all seriousness, this looks like a great textbook on some of the theory behind the software I use every day to do my lighting simulations (I managed to score a used copy through Amazon.com for less than half the list price recently, and it arrived today). All the squiggly lines and Greek characters are a little intimidating, but I generally can get the gist of what the authors are trying to say about light transport through them, even if I did fail Algebra II.