Bob have you tried this? I get completely black when I run it in 3.5. When I
run the prior one I do get a spot light but it has a strange anomoly where
there seems to be a change in shade at about one third down the cone.

"bob h" <omn### [at] charternet> wrote in message
news:3c424849$1@news.povray.org...
> Here it is with scattering so shadows show up in the light beam.
> Admittedly, I don't know geometry well enough to keep the distance and
width
> of light beam in sync.  Must be a formula for keeping angle relative to
the
> cone apex height and base diameter ratio.
> BTW, this was fairly quick for me to render.
>
> #declare F=1.333; // fudge factor
> #declare D=10*F; // distance
> #declare S=5*F; // scale
>
> #declare ConeOfLite=
> cone {
>         0,0,y,1
>         pigment {rgbt 1}
>         interior {
>                 media {
>                         emission 1/3/S // intensity of air glow
>                         scattering {1,0.2}
>                         density {
>                                 cylindrical
>                                 }
>                 }
>         }
>  scale <S,D,S> // x and z are width, y is length or distance
>  hollow
> }
>
> light_source {
>   0, 1
>   spotlight
>   point_at y
>   radius 6*S
>   falloff 12*S
>   looks_like {ConeOfLite}
>  rotate <120,90,0> translate <-3,2,0>
> }
>
> plane {y,-1
>         pigment {rgb <.9,.6,.3>}
> }
>
> sphere {0,1 pigment {rgb .5}}
>
>
>

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