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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