Implement Line of Sight with Unreal Engine 4

Line of Sight/Fog of War, an effect where the player can only observe a part of the game world, is a common technique that is usually applied to top-down games of various genres such as MOBA (DotA or LoL), RTS (Age of Empires series) or even a few RPG titles. I've been struggling to find a proper and easy to follow Line of Sight/Fog of War tutorial for UE4 for a while, but I can't find one. So today, one of the last days of 2017, I decided to make one by myself. It's a nice way to end a year, isn't it?

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