image to present bug when image rendered with alpha channel

ABX
-- 
disc{z,-z#macro O()asc(substr("-+((1*(,1,/.-,*/(,&.323/'1"e 1))/10-4#declare
e=e-1;#end#local e=26;5pigment{#local g=function(_){ceil(_)-_}function#local
k=function{pattern{object{sphere_sweep{linear_spline 13#while(e)<O()O()>.01#
end}}}}{k(g(atan2(x,y)),g(ln(pow(x+y,2)+1e-5)),0)}}finish{ambient 1}}//ABX35

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