Hi Andrew,
    Sounds like you're trying to do the same thing as me. I have had limited
success so far in building clouds using the media of v3.1 - have a look at my
'Hazy Days ...' posts on p.b.i and the source on p.t.s-f if you want to see how
I'm going about it.

    One thing you need to remember with density maps - you are actually
defining the optical density in each of the red, green and blue with 1 being
brightly emmiting/highly absorbing/hugely scattering media and 0 being
transparent; filter and transparency have _NO_ effect.

    Hope this helps,
        Mike Andrews.

Andrew Clinton wrote:

> I've just downloaded pov 3.1 and got possibly a little too excited about
> the new media feature.  I thought that it would be possible (using a scaled
> sphere and interior) to produce wispy bozo clouds in 3d.  The problem is
> that when I enter a transparency value in the density color_map the
> renderer completely ignores it and uses only the red green and blue values.
>  Am I doing something wrong or is there a way around this problem?
>
> Andrew Clinton
> The POV Place - http://www3.sympatico.ca/dclinton/pov/povplace.htm

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