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The simplest fog type is the constant fog that has a constant density in all locations. It is specified by a distance keyword which actually describes the fog's density and a fog color.
The distance value determines the distance at which 36.8% of the background are still visible (for a more detailed explanation of how the fog is calculated read the reference section "Fog").
The fog color can be used to create anything from a pure white to a red, blood-colored fog. You can also use a black fog to simulate the effect of a limited range of vision.
The following example will show you how to add fog to a simple scene (fog1.pov).
#include "colors.inc"
camera {
location <0, 20, -100>
}
background { color SkyBlue }
plane { y, -10
pigment {
checker color Yellow color Green
scale 20
}
}
sphere { <0, 25, 0>, 40
pigment { Red }
finish { phong 1.0 phong_size 20 }
}
sphere { <-100, 150, 200>, 20
pigment { Green }
finish { phong 1.0 phong_size 20 }
}
sphere { <100, 25, 100>, 30
pigment { Blue }
finish { phong 1.0 phong_size 20 }
}
light_source { <100, 120, 40> color White}
fog {
distance 150
color rgb<0.3, 0.5, 0.2>
}

A foggy scene.
According to their distance the spheres in this scene more or less vanish in the greenish fog we used, as does the checkerboard plane.
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