Physically Based Rendering, 2nd Edition describes both the mathematical theory behind a modern photorealistic rendering system as well as its practical implementation. A method - known as 'literate programming'- combines human-readable documentation and source code into a single reference that is specifically designed to aid comprehension. The result is a stunning achievement in graphics education. Through the ideas and software in this book, you will learn to design and employ a full-featured rendering system for creating stunning imagery. New sections on subsurface scattering, Metropolis light transport, precomputed light transport, multispectral rendering, and much more.Includes a companion site complete with source code for the rendering system described in the book, with support for Windows, OS X, and Linux. Please visit, www.pbrt.org. Code and text are tightly woven together through a unique indexing feature that lists each function, variable, and method on the page that they are first described.