--- /dev/null
+ply
+format ascii 1.0
+comment single tetrahedron with colored faces
+element vertex 4
+comment tetrahedron vertices
+property float x
+property float y
+property float z
+element face 4
+property list uchar int vertex_indices
+property uchar red
+property uchar green
+property uchar blue
+end_header
+0 0 0
+0 1 1
+1 0 1
+1 1 0
+3 0 1 2 255 255 255
+3 0 2 3 255 0 0
+3 0 1 3 0 255 0
+3 1 2 3 0 0 255