Can somebody can help me to simulate an "Atmospheric blue media" like
Terragen does (for example) this test scene following use the fog to
simulate it but I think I can does it better with medias... the fog is too
simple and the far spheres looks to be erased by the fog, I just want to
make them blue-er like when you look at far mountains at the morning...

// MEDIA test... without media so !

background {color rgb <0.1, 0.1, 0.8>}

light_source {<30, -30, 100> color rgb <1.0, 1.0, 0.9>
area_light <-10,-10,-10><10,10,10>,5,5
adaptive 2
jitter
circular
orient
}

plane {z,0 texture {pigment {color rgb <1.0, 1.0, 0.9>}}}

camera {location <0, 0, 1.7> look_at <0.0, 50.0, 1.0>}

#declare yy = 0;

#while (yy < 31)
 sphere {<3, yy*8, 1>1 pigment {color rgb <0.7, 0.1, 0.2>}}
 sphere {<-3, yy*8, 1>1 pigment {color rgb <0.7, 0.1, 0.2>}}
 #declare yy = yy + 1;
#end

fog {
  fog_type 1
  distance 150
  color rgb <0.5, 0.5, 0.8>
}

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