The second is the same 100x100 tilings, but intersection a cylinder for the
bounding. It takes 35minutes and 20 seconds to render.(2000 times ,Is it
terrable?)




#declare one_piece =
union{
    box{
    <0.005, 0.005, 0>, <0.395, 0.395, 0.01>
    }
    cylinder{
    <0.02, 0, 0>, <0.38, 0, 0>, 1
    scale <1,0.18,0.02>
    translate <0, 0.2, 0.01>
    }
    pigment{
    rgb<0.4,0.6,0.6>
    }
}

#declare the_tiling =
union{
    #for(i, 0, 99)
        #for(j, 0, 99)
            object{
            one_piece
            translate <i*0.4, j*0.4, 0>
            }
        #end
    #end
}



intersection
    object{
    the_tiling
    }
    cylinder{
    <20,20,0>,<20,20,1>,19
    }
    cutaway_textures
}

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