"gawryl" <gaw### [at] gmailcom> wrote in message 
news:web.44dbb331f98bfec2dcd30180@news.povray.org...
>
> I slighty modyfied your's code (i have add Hue value as a 4-th parameter 
> in
> the data source file) and get quite nice (for me, of course) results (see
> pictures at http://alpha.uwb.edu.pl/gawryl/edh/povray-tests.html).
>

Wow, That was quick.

>
> my question - how can i create cloud like (as opposed to a solid) 
> spheres -
> is it simple? Stephen was mension something about it in contets of MRI
> scan...
>
> regards,
> gawryl
>

Hi Gawryl,

There are quite a few ways. You'd probably want to look at the media 
tutorial in the POV-Ray help files (enter the keyword 'media' in the index).

A quick and dirty way of doing something similar is to just add some 
transparency to the colour definition, so instead of
pigment {color rgb <1,0,0>}
you can specify
pigment {color rgbt <1,0,0,0.7>}
to give you a red colour with 70% transparency.

Note, that you'll probably need to increase the max_trace_level to get rid 
of black regions and the corresponding error message in the message log. You 
can do this by adding a line such as
  global_settings { max_trace_level 30}
to the top of your scene file. This slows down the render a fair bit, so you 
should keep an eye on the message log to optimise this setting

Regards,
Chris B.

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