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.

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