# 1 	-body material
# 2 = 1	-ends filled
#
#   0--1
# 7/    \2
# |  *   |  Y
# 6\    /3
#   5--4
#
#    X

here
p -0.333 1 0
p 0.333 1 0
p 1 0.333 0
p 1 -0.333 0
p 0.333 -1 0
p -0.333 -1 0
p -1 -0.333 0
p -1 0.333 0

p -0.333 1 1
p 0.333 1 1
p 1 0.333 1
p 1 -0.333 1
p 0.333 -1 1
p -0.333 -1 1
p -1 -0.333 1
p -1 0.333 1

mtl %1
f 0 1 9 8
f 1 2 10 9
f 2 3 11 10
f 3 4 12 11
f 4 5 13 12
f 5 6 14 13
f 6 7 15 14
f 7 0 8 15

cmp 0 %2 1
?0 f 0 1 4 5
?0 f 1 2 3 4
?0 f 0 5 6 7
?0 f 8 9 12 13
?0 f 9 10 11 12
?0 f 8 13 14 15