Hi ,
I have to say thank you and VXGI on UE 4.12 is great news for people who is working on exterior scene with water and glass materials involved.
Even if there is no improvement on XVGI itself, combining with UE 4.12 is a great improvement because some of important features have been achieved in 4.12 such as planar reflection and cubemap improvement.
Still, I have a question about VXGI. After days and days tweaking the options in VXGI, I finally get VXGI to work at the same cost of LPV GI in my scene. All VXGI features take 2.4ms to render. However, I noticed that VXGI opacity takes 0.81ms to render in GPU profiling. I wonder what VXGI opacity does, why it consumes so much power and how we can do to reduce the cost of it.