12: Light Sources
In order for objects in a scene to be visible, there must be a source of illumination so that some light is reflected from them to the camera sensor. This chapter first describes different physical processes that lead to photon emission and then introduces the abstract Light class, which defines the interface used for light sources in pbrt. The implementations of a number of useful light sources follow. Because the implementations of different types of lights are all hidden behind a carefully designed interface, the light transport routines in Chapters 14, 15, and 16 can operate without knowing which particular types of lights are in the scene, similar to how acceleration structures can hold collections of different types of ...
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