I am experiencing some weird artifacts with radiosity, namely black blotches. I
know this is a pretty standard problem, but all solutions I found recommend
changing the error bound etc which I think I've done correctly yet I still get
the artifacts. I am using povray 3.7.





       global_settings { assumed_gamma 1 radiosity {             // --- Settings
3 (high quality) ---
    pretrace_start 0.08
    pretrace_end   0.005
    count 400
    error_bound 0.01
    recursion_limit 1
    nearest_count 20
  }}



#include "colors.inc"    // The include files contain




camera {
location < -100,240,-20>
look_at  <0.0,20,0>
//angle 8.7
focal_point <0,20.0>
    blur_samples 80

}
 sphere{<100,100,0> 20 finish{emission 40} pigment{White} hollow}

plane {
        <0, 1, 0>, -3

        pigment{color <1,1,1>}
        finish { reflection {0.5} ambient 0.0 diffuse 1 specular 0 brilliance 0}
        no_reflection


}

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