Traditionally, atmospheric effects in games are rendered rather naively. Fog, for example, is even today in many titles created with simple blending to background color with linear falloff. While it works in some cases, actual light behavior in participating media (such as fog, dust, water, and any kind of atmosphere) is far from being that simple. Light interacts with particles in complex way. Some percent of light is traveling directly to the observer; part of the light is scattered into ...
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