triangles 2  4 4

  0.0  1.0  0.0
-1.0  -1.0 -1.0 
 1.0  -1.0 -1.0 
 0.0  -1.0  1.0 

0 2 3
0 3 1
0 1 2
3 2 1
 
 0.2  0.8 0.8    
0.8     0.4   10
0.0 0.0