There's also this work by Wenzel Jakob, who is these days a CG pioneer: https://rgl.epfl.ch/publications/Jakob2010Radiative https://rgl.epfl.ch/publications/Jak

There's also this work by Wenzel Jakob, who is these days a CG pioneer: https://rgl.epfl.ch/publications/Jakob2010Radiative https://rgl.epfl.ch/publications/Jakob2010Radiative