# A Multi-Faceted Exploration (Part 3)

#1

In the last post, I’d shown how a small tweak to Imageworks’ multiple-scattering Fresnel term, $\color{brown}{F_\mathrm{ms}}$, brought their approximation closer to the reference solution of Heitz et al. However, there was still a niggling difference at high roughness, most noticeable under uniform lighting:

This is a companion discussion topic for the original entry at https://blog.selfshadow.com/2018/08/05/multi-faceted-part-3/
unlisted #2