VARIABLES = "X" , "Y" ,"Z"
ZONE T= "TRIANGLES"   N=6 , E=4, F=FEPOINT, ET=TRIANGLE
0 0 0
0.5 0 0.5
1 0 0
1 0.5 0
0.5 0.5 0.5
0 0.5 0

1 2 6 
2 5 6 
2 3 5 
3 4 5