Global photons
// adding a photon{} block to global_settings activates photon mapping.
// photons also need to be adjusted for light sources and objects.
global_settings {
photons {
spacing 0.01 // specify the density of photons
//count 100000 // alternatively use a total number of photons
//gather min, max // amount of photons gathered during render [20, 100]
//media max_steps [,factor] // media photons
//jitter 1.0 // jitter phor photon rays
//max_trace_level 5 // optional separate max_trace_level
//adc_bailout 1/255 // see global adc_bailout
//save_file filename // save photons to file
//load_file filename // load photons from file
//autostop 0 // photon autostop option
//radius 10 // manually specified search radius
// (---Adaptive Search Radius---)
//steps 1
//expand_thresholds 0.2, 40
}
}