Only hollow objects can contain a media, i.e. you must add the "hollow"
keyword to the larger sphere. Check the manual for info about hollow and
solid objects.

Margus

Andrew Cocker wrote:
> 
> Hi,
>     Please help me with this annoying problem.
>     I have created a union of a sphere ( at origin, radius 1,textured mainly
> Red, but with Clear patches), a light_source, (also at origin
> media_attenuation on), and a final sphere ( also at origin, radius 2}.
>     How do I add media to the larger sphere, so that the shafts of light
> coming from within the smaller sphere are visible? I've tried following the
> documentation, but the outer sphere is invisible.
>     Here's my code ( it's messy, I know).
> 
> Thanks in advance.
> 
> Andy C.
>

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