OPC(plyFile, rotation = 0, minimum_faces = 3, minimum_area = 0)Orientation patch count is calculated on meshes that represent specimen surfaces and have already been downsampled to 10,000 faces and pre-smoothed in a 3D data editing program. Alignment of the point cloud will have a large effect on patch orientation and must be done in a 3D data editing program such as Avizo, or using the R package auto3dgm prior to creating and reading in the ply file. The occlusal surface of the specimen must be made parallel to the X- and Y-axes and perpendicular to the Z-axis.
The default for minimum_faces is to ignore patches consisting of only a single face on the mesh. Changing the minimum_area value will disable minimum_faces.