Editing Photon mapping (section)

===Diffuse interreflection===

[[Diffuse interreflection]] is apparent when light from one diffuse object is reflected onto another.  Photon mapping is particularly adept at handling this effect because the algorithm reflects photons from one surface to another based on that surface's [[bidirectional reflectance distribution function]] (BRDF), and thus light from one object striking another is a natural result of the method.  Diffuse interreflection was first modeled using [[Radiosity (computer graphics)|radiosity]] solutions.  Photon mapping differs though in that it separates the light transport from the nature of the geometry in the scene.  [[Color bleeding (computer graphics)|Color bleed]] is an example of diffuse interreflection.