ply
format ascii 1.0
comment VCGLIB generated
element vertex 4
property float x
property float y
property float z
element face 4
property list uchar int vertex_indices
end_header
1 1 1 
-1 1 -1 
-1 -1 1 
1 -1 -1 
3 0 1 2 
3 0 2 3 
3 0 3 1 
3 3 2 1