I would need something like this inside unreal engine beacause there is a lot of functionnality in unreal I need for my project (compared to unity), put what’s making me not so sure about it is that I really need UVR predict engine which is only in unity.
I’m guessing the new substrate material system is the closest you would get “out of the box”.
It has a physically correct reflection / refraction system and physically accurate layered material interactions.
As for luminance evaluation, I’m not sure unreal has any build in tools that can handle this. You would probably need to do an analysis of the lighting buffer to extract this information.