> And now i draw the conclusion that it's impossible to achieve the same
> result by using the media object, anybody disagree with me??
I diasagree.
It can be done with media, that's what media is for.
People make perty, fluffy clouds with it all the time.
Something like this media should show up fine...

#declare Ring =box{-0.5,0.5
    texture {pigment{Clear}finish{ambient 0 diffuse 0}}
    hollow
    interior{
        media{
            scattering{1, 0.0028 extinction 0.3}
            absorption 0.00015
            emission <1, 1, 1>*0.9
            density{
                density_file df3 "ring.df3"
                interpolate 2
                translate <-0.5,-0.5,-0.5>
                scale <1,-1,1>
            }
        }
    }
}

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