Hi,

I have this blob made up of 5000 glass spheres inside a spherical HDR. 
The result is attached. I turned on photons, but can't get any caustics 
to appear.
MegaPOV returns an error: Slab Building warning: Could not save photon 
map - no photons!

The blob object hass these propertis:
sturm
texture {
   pigment { color rgbt 1 }
   finish {
     ambient 0
     diffuse 0
     reflection { 0.1, 1.0 fresnel on }
     conserve_energy
   }
}
interior {
   ior 1.5
   fade_distance 1.1
   fade_color <0.11, 0.1, 0.3>
}
photons{
   target Radius1/2
   refraction on
   reflection on
}

I can't find out what is wrong. Any suggestions are welcome.

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