#local BasicBrick = difference {
  box { <-10,0,-30>,<10,24,30> }
  quadric {-<0,0,1/180>, <0,0,0>, -<0,-1,-1/3>, -5 }
  box { <-10.1,16,10.1>, <10.1,24.1,30.1> }
  
  clipped_by {  box { <-10.00001,-0.00001,-30.00001> <10.00001,24.00001,30.00001> } }
  bounded_by { clipped_by }
}

#local BrickInside = merge {
   difference {
     box { <-6,4,-22>,<6,24.1,26> }
     quadric {-<0,0,1/144>, <0,0,0>, -<0,-1,-13/36>, -313/36 }
   }
   box { <-5.99999,20,-26>,<5.99999,24.1,21> }
}

#local Brick = union {
difference {
  object { BasicBrick }
  object { BrickInside }  
}
box { <-6,6,10>,<6,24,6> } 
box { <-1,5,10>,<1,16,14> } 
}
#declare _50950_dot_dat = object { Brick }