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Have you tried using a dust halo?
I just recently downloaded POV-RAY, and was working my way through the
tutorial in the Documentation, and there's a section on using halos to
achieve effects like the one you describe. I want to say it's like
section 4.9 or so in the documentation (I don't have the documentation
on me or a copy of POV-RAY handy or I'd actually write code to help you
out) I haven't read anything about media yet, so I don't know why the
code you have doesn't work.
Hope this helps point you in the right direction!
>
> ok, what i want is to have a ball bouncing (no problem) while being
> illuminated mostly by an overhead spotlight (no problem) in a dusty room
>
> (ie the spotlight beam is visible - PROBLEM). i'm not really sure how
> to do this, but maybe someone can help me? =) here's the code i have so
>
> far (rather, most of it... the pertinent part). i'm pretty sure the
> "media" part is wrong, but i have no clue what to change it to.
>
> thanx for any assistance
>
> media {
> scattering { 1, rgb 0.001 }
> }
>
> camera {
> location <-15, 10, -40>
> angle 30
> look_at <0, 2, 0>
> }
>
> light_source {
> <0, 25, 0>
> colour rgb 1.25
> spotlight
> radius 10
> falloff 15
> // tightness 1
> point_at <0, 0, 0>
> area_light
> <0, 5, 0>, <0, 0, 5>, 5, 5
> jitter
> media_attenuation on
> media_interaction off
> }
>
> light_source {
> <-15, 10, -40>
> colour rgb 0.25
> shadowless
> media_interaction off
> }
>
> sphere {
> <0, 5, 0>, 2
> texture {
> BallTexture
> }
> }
>
> plane {
> <0, 1, 0>, -Rad
> texture {
> PlaneTexture
> }
> }
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