> sphere // transparent sphere containing media
>  { <0, 2, 0>,1
>    pigment { rgbt 1 }
>    hollow
>    interior
>    { media
>      { emission 1
>        density
>        { spherical density_map
>          { [0 rgb 0]
>            [0.4 rgb <1,0,0>]
>            [0.8 rgb <1,1,0>]
>            [1 rgb 1]
>          }
>        }
>      }
>   }
> }
> 
> which I literally copied from the tutorial (except for the position of 
> the sphere's center), no visible media at all? Yes, I noticed that 
> emitting media is best visible against dark backgrounds, so I set the 
> ground plane to rgb 0.2 - but all I ever get is an empty grey plane 
> beneath an empty black sky!

You forgot to move the pattern with the object. If you instead crate the 
sphere at the center, and just translate it around once you've equipped 
it with the media, you should be fine.

Likewise, if you substituted "onion" for "spherical", you'd have gotten 
some visible stuff, too (but again most likely not what you want).

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