Line of Sight Fog in material only?

Hey,
I have bought a fog of war asset on the marketplace.

The problem is, that any obstacle needs to be an actor_bp…

https://i.ytimg.com/vi/RZak6nHRY-k/maxresdefault.jpg

So i thought about, to create a material which does all the things for the line of sight fog, but i have no idea how…

It should allow to only show areas where the top-down-character can look at, if there´s a wall in it´s way, the player can´t see behind the wall.

What do you think, is this possible?

And how would you do that?

I have the same situation as you, don’t understand what is wrong, if you can solve it please share it with me [run 3][1]