Phil Cook <phi### [at] nospamdeckingdealscouk> wrote:
> I thought media would only function with a light_source producing a ray to  
> sample along as stated in 6.8, AFAIK ambient, like emission, doesn't  
> produce light in this way even using radiosity.

  You thought wrong.

  Media does not need light sources to show up. Radiosity doesn't check
light sources, only the brightness of things. (Whether or not radiosity
takes media into account at all is another issue I haven't studied.
However, that's unrelated to light sources anyways.)

-- 
plane{-x+y,-1pigment{bozo color_map{[0rgb x][1rgb x+y]}turbulence 1}}
sphere{0,2pigment{rgbt 1}interior{media{emission 1density{spherical
density_map{[0rgb 0][.5rgb<1,.5>][1rgb 1]}turbulence.9}}}scale
<1,1,3>hollow}text{ttf"timrom""Warp".1,0translate<-1,-.1,2>}//  - Warp -

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