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Jason Lewis from Obsidian Entertainment has shared his neat experiments with lighting in Unreal Engine 4. The artist used a scene with an M41 tank model to test different scenarios.
So I have been messing with UE4 for some time now, and have recently been diving deeper into lighting. My M41 tank model is the one I built for the modern tank MMO, Armored Warfare, but since that game was running in an older non-PBR version of Crytek, I decided to re-texture it in Substance Painter and put it into a UE4 scene to learn more about lighting. The scene is lit with a directional light and a skylight, along with lots of Post-Process adjustments and a LUT texture put into the post process volume.
Here are the experiments with comments from the artist: