#D4---------------------------------------------- plane p 0 0 0 0 0 1 -1 0 0 psphere p p 20 0 90 #profile pf o -4 -4 1 l 8 d 0 1 l 8 d -1 0 l 8 profile pf o -4 -4 1 l 8 c 2 90 l 8 d -1 0 l 8 prism p2 pf 0 0 40 bfuse f p p2 nexplode f f depouille result f 0 0 1 f_7 5 0 0 40 0 0 1 set square 4630.78