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In article <3999305d@news.povray.org>, "Ammar Al-Allak"
<a.a### [at] uea acuk> wrote:
> Can someone give me some help as to how pov ray's scattering works. Is it
> based on physically accurate formula?
Depends on what you mean by "physically accurate"...it is based on
computer models of the real world, but these models don't apply to all
situations. It is not a perfect simulation, but it is not entirely
unrealistic. Could you be more specific about what you are looking for?
> Is it wavedependent etc...
It is not wavelength dependant, though there is someone working on a
patch to add this ability.
--
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/
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Ammar Al-Allak wrote:
>
> Hello there...
>
> Can someone give me some help as to how pov ray's scattering works.
Basically, the brightness (emission) of a sample varies based on how much light
it receives; and where the light comes from, in relation to the viewer (except
with isotropic scattering).
> Is it based on phuscally accurate formula ?
What qualifies as physically accurate? Certainly several lighting effects are
not implemented for scattering, or for POV in general. Most are just not worth
the associated performance hit. The scattering formula is not physically
accurate either, its just a statistically close approximation of a kazillion
tiny illuminated particles. Nevertheless, the model is accurate enough for most
practical purposes. Learning to use it is the difficult part.
> Is it wavedependent etc...
>
Scattering not wavelength dependant. Someone (IIRC Mark Wagner) was working on
this, but I don't know how/if it is coming along.
--
Margus Ramst
Personal e-mail: mar### [at] peakeduee
TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg
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