Micha Riser wrote:

> one way I could think of filter is that it is like a thinn, strong layer
> of scattering media behind the surface.. but I have no idea if the POV
> developper had this in mind or this is consitient with POV (probably not)

I revise my model. NOT scattering but absorbing media only. So cancle out 
the scattering amouth gives:

> The part of light shining through the media layer:
>  exp(-f*p*dl) * o
> which can be approximated using exp(x) = 1+x to:
>  (1-f*p*dl)*o
> 
setting dl to 1:
  f*(o*p) + (1-f*p)*o

> 
> Now this shines only through as much as the transparency of the surface
> is, so the whole is multiplied by t. Including the "normal" lighting this
> gives:
  (1-t)*l + t*o*(1-f*p)

Hope this makes more sense now.

> 
> Any comments?

- Micha

-- 
POV-Ray Objects Collection: http://objects.povworld.org

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