I am not going to be much help with your problem, media just acts that way
sometimes, but I wanted Ken to note the proper way to indent and arrange
code. Especially note the double spaced close-braces at the end.


>
> #declare Air =
>
>    material  // Air
>
>    {
>
>       texture
>
>       {
>
>          pigment
>
>          {
>
>             color rgbft <1.0, 1.0, 1.0, 1.0, 1.0>
>
>          }
>
>       }
>
>       interior
>
>       {
>
>          ior 1
>          media
>
>          {
>
>             scattering
>
>             {
>
>                4 ,  rgb <0.0, 0.5, 1.0> // isotropic scattering
>
>             }
>
>             density
>
>             {
>
>                spherical
>
>             }
>
>          }
>
>       }
>
>    }
>

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