Hi lien0n,
Transparency (really opacity) is controlled by using the alpha channel in 
the image_map graphic which wraps a 2D image onto a 3D surface. See 
http://www.povray.org/documentation/view/3.6.1/337/
DLM


"lien0n" <nomail@nomail> wrote in message 
news:web.44f25299a61f9468598059850@news.povray.org...
> "dlm" <me### [at] addressinvalid> wrote:
>>
>> Put all your density on a surface (outer edges of cloud), perhaps a
>> transparent texture map will work, or build a volume approximating to a 
>> thin
>> surface shell and fill that with suitable media.
>>
>> DLM
>
> thanks, DLM.
>
> but what is the transparent texture map, and how to use it?
>

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