This book provides a detailed overview of the state-of-the-art in light transport simulation with pointers to the relevant literature. The authors go into detail in explaining the underlying theory and provide all the details necessary to implement some of the most fundamental algorithms such as path tracing, bi-directional path tracing, photon mapping, and Metropolis light transport. Some of the more advanced algorithms will then be described on higher level. The unique feature of this book is that it presents a classification of the existing light transport methods, all expressed in the same mathematical framework.