"Bryan Valencia" <no### [at] waycom> schreef in bericht 
news:4887f27d$1@news.povray.org...
>
> ok, maybe I'm just dense (pun intended)
> But I added the 2 densities and my media effect disappeared while the sky 
> was still white.
>
> This is my media
>
> media {
>   intervals 20
>   scattering { 4, rgb 0.01 }
>   samples 2, 10
>   confidence 0.9999
>   variance 1/1000
>   ratio 0.9
> //   density {planar scale y*5 }
> //   density {granite scale 0.1}
> }
>
> The two // lines are the ones I added.

As a start, try this from one of my scenes. The parameter SkyScale scales 
the sphere used as a sky.
Also, remember to always use intervals = 1 as the default method is 3.

//start code
background {Black}

sphere { <0, 0, 0>, 1
  texture {pigment {rgb 0 transmit 1} }
  interior_texture {
    pigment {
      gradient y
      color_map {
        [0.0 rgb <0.6,0.7,1.0>*0.3 transmit 0.3]
        [0.7 rgb <0.0,0.1,0.8>*0.3 transmit 0.3]
      }
    }
    finish {ambient 1 diffuse 0}
  }
  scale SkyScale
  hollow
  #if (Atmo)
    interior {
      media {
        intervals 1
        scattering {2, rgb 0.3/SkyScale}
        samples 300
        confidence 0.9999
        variance 1/1000
        ratio 0.9
      }
    }
  #end
}
//end code

Thomas

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