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