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#### Atmospheric Attenuation

  Normally light coming from light sources is not influenced by fog or atmospheric media. This can be changed by turning the `media_attenuation on` for a given light source on. All light coming from this light source will now be diminished as it travels through the fog or media. This results in an distance-based, exponential intensity falloff ruled by the used fog or media. If there is no fog or media no change will be seen. Note in POV-Ray 3.0 this feature was turned off and on with the `atmospheric_attenuation` keyword.

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