! Any number of atmospheric effects may be associated with the default ! medium (``air'').
fogcolor thinness
Add exponential fog with the specified thinness and color.
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mistcolor thinness zero scale
Add global low-altitude mist of the specified color. The color of
a ray is modulated by a fog with density that varies linearly with
! the difference in z coordinate (altitude) between the ray origin and
the point of intersection. The thinness values specify the transmissivity
of the fog for each color channel.
The base altitude of the
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+
+