sco### [at] spamcom news:417507e1@news.povray.org

> I have one question, can anyone explain why when I set the colour of the
> plane to black the photons don't show up? 

Because the light is not deffused, even the one from photons.

Btw, I think that adding  diffuse_photons (with by default equals to 
deffuse) would be a good idea. Such oimages would not be corect from 
phisics point of view, but this can be used to make nice artistic images.

As for now, perhaps You could use something like

plane { ...
  pigment { rgb 1 }
  finish { diffuse .5 ambient -.5 }
}

or simmilar? 
AFAIK that way direct right would have intensity of:

  light-source * material-color * material-diffuse + material-ambient
= 1 * 1 * 0.5 - 0.5 = 0

and concentrated photons caustic would be in example

10 * 1 * 0.5 - 0.5 = 9.5 = 1 (after clipping)


-- 
http://www.raf256.com/3d/
Rafal Maj 'Raf256', home page - http://www.raf256.com/me/
Computer Graphics

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