Hello,
First of all: I’m a complete beginner.
So please keep your answer understandable for newbies 
Now to the problem: I tried to get a PPV following the player to achieve a darker mood, when it rains.
I got a rain sphere following the player and changed the roughness of the ground gradually, but I can’t find a way to add PPV’s to the blueprint.
I searched this forum and tried to solve the problem with Matinee, but I failed at adding the Matinee to the blueprint event as well.
Thank you very much!