This is a header-only C++ library that implements 3D Morphable Face Model (3DMM) fitting. It provides classes to represent and sample from PCA-based face models (supporting SFM, BFM, LYHM), and implements linear fitting algorithms for pose, shape, and expression estimation from 2D images. The library includes edge-fitting and contour-based optimization to reconstruct 3D face geometry from a single image.