ply
format ascii 1.0
element vertex 8
property float32 x
property float32 y
property float32 z
property float32 nx
property float32 ny
property float32 nz
element face 6
property list uint8 int32 vertex_indices
end_header
-1 -1 -1 0.0  0.0  1.0
1 -1 -1 0.0  1.0  0.0
1 1 -1 0.0  1.0  1.0
-1 1 -1 1.0 0.0  0.0
-1 -1 1 1.0  0.0  1.0
1 -1 1 1.0  1.0  0.0
1 1 1 1.0  1.0  1.0
-1 1 1 1.0  1.0  2.0
4 0 1 2 3 
4 5 4 7 6 
4 6 2 1 5 
4 3 7 4 0 
4 7 3 2 6 
4 5 1 0 4 
