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#### Using Ground Fog

The much more interesting and flexible fog type is the ground fog, which is selected with the `fog_type` statement. It's appearance is described with the `fog_offset` and `fog_alt` keywords. The `fog_offset` specifies the height, i. e. y value, below which the fog has a constant density of one. The `fog_alt` keyword determines how fast the density of the fog will approach zero as one moves along the y axis. At a height of fog_offset+fog_alt the fog will have a density of 25%.

The following example (`fog5.pov`) uses a ground fog which has a constant density below y=25 (the center of the red sphere) and quickly falls off for increasing altitudes.

      fog {

        distance 150

        color rgbf<0.3, 0.5, 0.2, 1.0>

        fog_type 2

        fog_offset 25

        fog_alt 1

      }

The ground fog only covers the lower parts of the world.'

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