Fog Of War

Easy to implement Fog of War system for a Top Down game. Fog of War
uses blueprints and post-process materials to create an effect
known commonly in video games as a fog of war. In addition to
simply displaying or hiding actors in sight, in allows for a clear
display of players range of vision. All aspects of the fog such as
range, angle of the vision cone and visibility of all objects can
be easily adjusted with variables. Fog of War is a key element of
many top down games, and now it takes only one minute to implement.
To use the system you simply need to put the fog drawing actor in
your world and add the fog controlling component to any actor that
interacts with the fog (either by blocking vision or by changing
its own visibility). Currently only one source of vision is
supported (you can?t combine vision from many sources, but you can
toggle between them).

Update 1.1:
-Updated to UE 4.15.
-Round objects (like columns/pillars) can now cast proper
shadows.
-Added more comments and cleaned up the code.