League of Legends Lightmapping? Black Fog?

Hey guys. So in LoL your whole map is unexplored and there is only one directional light source thats following the player. I want the same in my game but I really have no clue how to achieve it. My idea was to lay black fog over the whole scene but areas that are affected by directional lights. So I can create a light that is following the player to uncover the area around, as well as some lights all over the scene to highlight special objects.
I know I can create Fog that starts at a certain distance of the player, but as I said, I want it to be affected by directional lights and not by the player itself. Does anyone of you ever did similar things?

So the goal is:
A directional light that is following the player
Black fog over the whole scene but the areas that are effected by the directional light.

Example:

32109-carl-plays-league-of-legends.jpg

greetz

That’s called “fog of war”, and there is a pretty good free solution. A similar question with some answers can be found elsewhere on this site.