> To be frank this argument shown quite well the misconception you have
> about this effect.  POV-Ray scattering media is much more 'real' than
> any commonly used subsurface scattering trick you find advertised in
> other programs.

It's possible... Maybe I'm wrong. The problem is that I'm looking for some
help because I'm unable to reach the same effects I've seen in the
articles:

- http://graphics.stanford.edu/papers/bssrdf/bssrdf.pdf
- http://www.tml.hut.fi/Opinnot/Tik-111.500/2002/paperit/kalle_koutajoki.pdf

or at these page:

- http://test.jzinfo.com/bssrdf.htm (in particular for teapot or work by
Jean Marc);

I'de like to use for marble objects the same effects I've seen, but I can't
find the right way to apply media and setup media parameters. Maybe someone
else have already experienced this... The messages I've read in the
newsgroups aren't sufficient...

For example is there a way to apply sub-surface scattering to a generic
object?
What is the best way to apply sss to a marble material?

I hope that anyone can help me. Meanwhile I'll try to experiment
furthermore in this direction.

Thanks.

Antonio

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Antonio Ferrari wrote:
> 
> It's possible... Maybe I'm wrong. The problem is that I'm looking for some
> help because I'm unable to reach the same effects I've seen in the
> articles:
> 
> - http://graphics.stanford.edu/papers/bssrdf/bssrdf.pdf
> - http://www.tml.hut.fi/Opinnot/Tik-111.500/2002/paperit/kalle_koutajoki.pdf

Did you actually read those?  I mean both clearly mention that 
scattering media simulation is well capable of generating subsurface 
scattering effects, just that it is quite computationally intensive.

Christoph

-- 
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 06 Jul. 2004 _____./\/^>_*_<^\/\.______

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news:web.4141be081326a68bbe3dcf8c0@news.povray.org...
> I hope that anyone can help me. Meanwhile I'll try to experiment
> furthermore in this direction.

See code below. The trick is to have a mostly transparent pigment and a very
dense scattering media.

light_source{-z*100 rgb 1 rotate x*30 rotate y*140}
camera{
  location -z*7
  direction z
}
superellipsoid{<0.3,0.3> rotate 45
    hollow
    texture{pigment{rgbt <1,1,1,0.8>} finish{ambient 0.1 diffuse 1}}
    interior{
        media{scattering{1,8}}
    }
}

G.


-- 
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http://www.oyonale.com
**********************
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- POV-Ray and Poser computer images
- Posters

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Christoph Hormann <chr### [at] gmxde> wrote:

> Did you actually read those?  I mean both clearly mention that
> scattering media simulation is well capable of generating subsurface
> scattering effects, just that it is quite computationally intensive.
>
> Christoph

As a programmer, I understand. Thank you Christoph. I'll try to understand
better media and how to apply that to my experiments. Another question is
to study the time-complexity of the algorithms implemented... I'll give a
look to the code...

Antonio

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