I have difficulties with photons/caustics. If you compare with 
Christoph's image of the scene, you will see there how the water plays 
on the ceiling. I cannot reproduce this.

I am using the following settings:

global_settings:
   photons {
     spacing 0.01
     gather 20, 100
     autostop 0
     jitter 0.5
     max_trace_level 15
     adc_bailout 1/10e5
   }

objects:
object {suzanne_ob
   interior {
     ior 1.5
     dispersion 1.05
     dispersion_samples 10
     caustics 1.0
     //fade_distance 5
     //fade_power 2
   }
   photons {
     target
     refraction on
     reflection on
     collect off
   }
}

object {water_ob
   interior {
     ior 1.3
     dispersion 1.05
     dispersion_samples 10
     caustics 1.0
     //fade_distance 5
     //fade_power 2
   }
   photons {
     target
     refraction on
     reflection on
     collect off
   }
}

light_source:
     photons { refraction on reflection on }

glass surfaces:
photons {pass_through}

How can I tweak these parameters?

Thomas

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