I'm pretty sure its monthly subscription. (20$ per month) You can try this great articles by the awesome guys at 'marmoset': http://www.marmoset.co/toolbag/learn/pbr-theory http://www.marmoset.co/toolbag/learn/pbr-practice
I was using CryEngine, mainly only for environments and not an actual game. But with UE4 combined with the power of blueprint and access to the full source code, even with the crutch of baked lighting compared to real time lighting, I might just switch to Unreal all together and try and make something out of it. I wanted…