Hi folks!
    	    	    	    	
Need help in understanding the 'photons{ }' directive...

The Scene:

  A light source & camera (but of course)
  A diamond-CSG-object, transparent, some reflection, lots of IOR
  A box-object, no IOR, no reflection (surface on which diamond rests) 

If I understand the manual correctly, all surfaces will show photon
caustics by default.

Therefore:

   The box should not need a 'photons{}' directive.
   The diamond should have a 'photons{ target refr on refl on }'

I'm not quite sure if the diamond itself should have a 'collect off'.

From what I gather, all light entering a diamond's crown comes back
out through the crown.  Since the light has bounced at least twice
inside the diamond before leaving again, I believe caustics are in order
therefore the 'collect off' should not be applied to it (what are your
thoughts here?) 

The target keyword...

passsage from the manual:
  
  The density of the photons can be adjusted by specifying the
  spacing_multiplier. If, for example, you specify a spacing_multiplier
  of 0.5, then the spacing for photons hitting this object will be 1/2
  of the distance of the spacing for other objects.

Generally I have seen more photons collected with target .8 rather than
with target .4, should it not be the reverse? 

All input and comments will be appreciated.

Thanks

-- 
(MIKA) Marc Champagne
marcch.AT.videotron.DOT.ca
Montreal, CANADA

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