#G2----------------------------------------------
beziersurf bs 4 4 \
  0  0 0   5  0 0  10  0 0  15  0 0 \
  0  5 0   5  5 2  10  5 0  15  5 0 \
  0 10 0   5 10 0  10 10 1  15 10 0 \
  0 15 0   5 15 0  10 15 0  15 15 0 
mkface bs bs
prism p bs 0 0 5
plane pc 8 8 1 0 0 1
pcylinder pc pc 5 10
bfuse f p pc
nexplode f f
depouille result f 0 0 1 f_7 5 0 0 11 0 0 1

checkprops result -s 926.278