ply
format ascii 1.0
element vertex 4
property float x
property float y
property float z
property uchar red
property uchar green
property uchar blue
property float nx
property float ny
property float nz
end_header
0.0 0.0 0.0 255 255 255 0.0 1.0 0.0
0.0 0.0 1.0 255 0 255 0.0 0.0 1.0
0.0 1.0 0.0 255 255 0 1.0 0.0 0.0
0.0 1.0 1.0 0 255 255 1.0 1.0 0.0