Can someone point me to the explanation of why the bright lines appear in the
shadows of this below scene? If the light is right at the center all looks good,
but when you start to move off to one side (or use an area light) the shadows
get the bright lines that show up. Is this a bug?

Thanks,
Stuart

#version 3.7; #include "colors.inc" global_settings {ambient_light <0,0,0>
assumed_gamma 1}
camera {angle 35 location  <500, 0 , 0> look_at <0 , 0 , 0>}
# declare boxcolor = texture{pigment{rgbt 1} finish { reflection 0.0 ambient 0.0
diffuse 0.0 phong 0.0 roughness 0.0 irid {0.0}}}
# declare boxinterior =  interior{fade_power 10000 fade_distance 9}
//light_source{<1000, 0 , 0> rgb <2,2,2>}
light_source{<1000, -10 , -10> rgb <2,2,2>}
plane { <1,0,0>,0 texture{pigment{rgb 1}}}
box {<700, 0, 0> <717.5, 20, 20> hollow texture{boxcolor} interior{boxinterior}}
box {<700, 0, 0> <735, -20, 20> hollow texture{boxcolor} interior{boxinterior}}
box {<700, 0, 0> <752.5, 20, -20> hollow texture{boxcolor}
interior{boxinterior}}
box {<700, 0, 0> <770, -20, -20> hollow texture{boxcolor} interior{boxinterior}}

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