A Microfacet‐based Hair Scattering Model

The development of scattering models and rendering algorithms for human hair remains an important area research in computer graphics. Virtually all available off or fur fibers are based on separable lobes, which bring practical advantages importance sampling, but do not represent physically-plausible microgeometry. In this paper, we contribute the first microfacet-based model. Based a rough cylinder geometry with tilted cuticle scales, our far-field model is non-separable by nature, yet allows accurate sampling. Additional benefits include support elliptical cross-sections analytical solution reflected lobe using GGX distribution. We show that captures glint-like forward features R have been observed before properly explained.