Many thanks - I'll play with those settings. I must confess that media still
mystifies me - as soon as I seem to be able to make a model in my head of
what it does, it goes and bites me in the arse. Why, for example, should the
extinction value be so significant - particularily as the docs advise that
the default is the most accurate representation? IMHO If x units thickness
of media show as white, then so should x+y (when the media is viewed from
the lighted side). Is this an inaccuracy? (the thick media showing as
black) - if so why does megapov compound the error?

--
Tom Melly
tom### [at] tomandluforce9couk
http://www.tomandlu.force9.co.uk

Bob Hughes <omn### [at] hotmailcom?subject=PoV-News:> wrote in message
news:38cfdd64@news.povray.org...
> I tried it out and although I don't fully know the reasoning behind it I
found
> putting  extinction .0025 into the 'scattering' statement fixes it.  The
logic
> seems right if there were 'media_attenuation on' in the light but I tried
adding
> that in as well with it both on and off, neither way makes a difference.
> Check it out using 0.0033 for the extinction and it's interesting.  My
guess is
> the missing link to 'density', it acts as though there is a  'density {rgb
1}'
> present I believe and if approximately  density {rgb .00025}  (or lower)
is used
> then it corrects it (no need for extinction then either).
>
> Bob
>
> "Tom Melly" <tom### [at] tomandluforce9couk> wrote in message
> news:38cfc981$1@news.povray.org...
> | Sorry for lack of clarity - have reposted with full code to
text.scene-files
>
>
>

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