Ah, that would be the "fringe" effect built into UE4. I threw it in early on just because I was messing with the new post pro stuff in UE4, then decided to get rid of it when I saw how blurry it was making the image.
Latest update: Original Post: Decided to start working on my first environment in UE4, and taking it as an obvious opportunity to learn more about PBR and how to use it properly. The scene I'm going for is this 1900s-1920s era Parisian cobblestone street, just after a rain, at twilight. I've gotten the basic pavement into…
More work on decorations/details for the buildings. Made some hanging variants of the shop signs, a window planter with a few variants, and a modular set for rain gutter piping. Done! And I also added a proper metallic map to those letters to give them a nice gold shine. I was worried about lightmapping on the letters…