0 0 0 a
0 0 1/2 b
0 0 z c
0 0 -z c
1/2 0 1/2 d
0 1/2 1/2 d
1/2 1/2 1/2 d
1/2 0 0 e
0 1/2 0 e
1/2 1/2 0 e
x y z f
-y x-y z f
-x+y -x z f
-x -y -z f
y -x+y -z f
x-y x -z f