So GI has arrived with all its challenges for the graphics programming team.
First steps are always the hardest.
Everything in life has fresnel!!
While I know that You have massive workloads to make GI work properly, I kindly ask to work very hard to get best fresnel possible even if Sansar is based on metalness workflow rather than a more accurate specular one .
The quality of fresnel will determine the quality and longevity of Sansar, now that photorealism is behind the corner.