Scattering much depends on the surrounding environment, the code you posted
here looks solid in all my tests.
BTW if you use a cylinder bigger than the light beam (with non-zero
extinction) you will see the bigger cylinder absorbing part of the
background.

--
Jonathan.

"Mick Hazelgrove" <mic### [at] mhazelgrovefsnetcouk> ha scritto nel messaggio
news:3bed3e61@news.povray.org...
> How can I make the beam of light solid - code follows
>
> light_source {
>   <-0, 5, 0>
>   color rgb <1,1,1>*30
>   spotlight
>   cylinder
>   point_at <0, -10, 0>
>   radius .5                // hotspot (inner, in degrees)
>   tightness 10            // tightness of falloff (1...100) lower is
softer,
> higher is tighter
>   falloff 3               // intensity falloff radius (outer, in degrees)
>    media_interaction on
> }
> cylinder{y*-10,y*10,1//was2
>   pigment {color rgbt 1}
>  interior{
>   media{
>   scattering{1,1 extinction .125}
>       method 3
>       samples 20,100
>       intervals 10
>       }
>   }
>    hollow
> }
>
> Mick
>
>

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