I am remembering: This is not because photon don't yet interact with media?

Thank light my thought.

Fabian.

Fabian Brau wrote:

> Hello,
>
> someone can help me? Perhaps Nathan.
>
> You can see below a small copy picture (because this group is not made
> for picture) of the picture post on p.b.i. and called  "wine of glass".
> But here the plane have a simple white pigment (no more wood image_map).
> The image is only 160*120 no AA. One can see that there are no color in
> the caustic! When there are no photons the shadow is really red. Now the
> shadow is black: ok this is good! but the caustic are white. Why?
>
> I used this settings:
> 1) in global settings
>
> #declare phd=1;
>   photons{
>     gather 20, 100
>     radius 0.1*phd, 2, 0.1*phd
>     autostop 0
>     jitter .4
>     expand_thresholds 0.2, 40
>   }
>
> 2) for the wine
>
> photons {
>     separation 0.02*phd
>     reflection on
>     refraction on
>    }
>
> 3) for the glass
>
> photons {
>     separation 0.02*phd
>     reflection on
>     refraction on
>     ignore_photons
>    }
>
> the wine is a simple absorbing media with absorbing color
> <0.27,1,1>*2.5. If I change this value the caustic are still white.
>
> Thanks
>
> Fabian.
>
>   ------------------------------------------------------------------------
>  [Image]

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