Fix background MIS, NumShadowRays != 1 and some few other tweaks - #37

Fix background MIS, NumShadowRays != 1 and some few other tweaks#37

pgrit merged 10 commits into

masterpgrit/SeeSharp:masterfrom

fix/vcm-bias-robustnesspgrit/SeeSharp:fix/vcm-bias-robustnessCopy head branch name to clipboard