POV-Ray photon mapping

Not visually pleasing but I wanted to see how to render rays of light in POV-Ray. There two things you need: a box/container for the whole scene with media/scattering, and to render with photon mapping. The scene was made using a Kotlin script builder similar to: POV-Ray Kotlin script blobgen

#declare rad = on;
#declare hqRad = on;

global_settings {
    #if(rad)
    radiosity {
        #if(hqRad)
        pretrace_start 0.08
                pretrace_end   0.01
                count 500

                nearest_count 10
                error_bound 0.02
                recursion_limit 1

                low_error_factor 0.2
                gray_threshold 0.0
                minimum_reuse 0.015
                brightness 1

                 adc_bailout 0.01/2
                #end
    }
    #end
    
    photons {
        count 2000
        media 100
    }
}
    
camera {
    location <0.0, 0.0, -25.0>
    look_at <0.0, 0.0, 0.0>
}

light_source { 
    <0.0, 0.0, 0.0> rgb <1.0, 1.0, 1.0>
    looks_like {
        sphere {
            <0,0,0>, 2
            texture{
                pigment {color rgb <1, 1, 1>}
                finish {
                    ambient 1 diffuse 5
                    emission 2
                }
            }
        }
    }
}

background {color rgb <0.0, 0.0, 0.0>}

box { <-10, -10, -10>, <10, 10, 10>
    pigment { rgbt 1 } 
    hollow
    interior { 
        media { 
            scattering { 0.5, 0.005 extinction 0.8 }
            samples 30
        }
    }
}

//Spheres
sphere {
    <-8.634976, 4.4759254, -1.8721784>, 0.6
    texture{
        pigment {color rgb <0.30298874, 0.8694627, 0.8612276>}
        finish {
            ambient 0.075
            diffuse 0.9
            reflection 0.9
        }
    }
    photons { 
        target reflection on 
    }
}

// ... thousands of spheres here
    
sphere {
        <-0.36827052, -3.8570876, -3.129366>, 0.2
        texture{
            pigment {color rgb <0.30298874, 0.8694627, 0.8612276>}
            finish {
                ambient 0.075
                diffuse 0.9
                reflection 0.9
            }
        }
        photons { 
            target reflection on 
        }
    }