RFI(plyFile, alpha = 0.01)Relief index is calculated by the ratio of three-dimensional surface area to two dimensional area on meshes that represent specimen surfaces and have already been 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 or auto3dgm prior to creating and reading in the ply file. The mesh must be oriented such that the occlusal plane is parallel to the X- and Y-axes and perpendicular to the Z-axis.
Some files may fail with pancake[TempF,] : subscript out of bounds. In these files it may be necessary to increase the alpha value which is default set to 0.01. Increasing the alpha value can cause the RFI function to over-estimate the size of the footprint. Caution should be exercised when troubleshooting by adjusting alpha