The new VXGI is !! I was pretty disappointed by the multi-bounce performance until I used the VxgiMapSize=64 and bVxgiHighQualityEmittanceDownsampling=false tweaks. Made a huge difference (from 6fps to 30fps on a GTX 670) and the lighting quality was still really impressive. You should make these the default settings in the next version.
I’m really stoked you guys made emissive lighting work as well. Lack of area lighting was one of the few major flaws of the UE4 engine. Well done, I can’t wait to see what the future of VXGI brings…