A quote from the official POV-Ray docs.
Brendan Ryan

Note a strange design side-effect was discovered during testing and it was too
difficult to fix. If the enclosing object uses transmit rather than filter for
transparency, then the media casts no shadows. For example:

 object{MyObject pigment{rgbt 1.0} interior{media{MyMedia}}} //no shadows
 object{MyObject pigment{rgbf 1.0} interior{media{MyMedia}}} //shadows



Peter Popov wrote:

> On Wed, 05 Jul 2000 09:36:15 -0700, SamuelT <STB### [at] aolcom> wrote:
>
> >I tried to get the milky color to be as bright as yours
> >(and many of the ones I have), but the media just wouldn't brighten up. It
> >would get brighter near the top, but darker when it cast a shadow in itself.
>
> Is it scattering media you're using? If so, did you try lowering
> extinction?
>
> Peter Popov ICQ : 15002700
> Personal e-mail : pet### [at] usanet
> TAG      e-mail : pet### [at] tagpovrayorg

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