Smooth Fading of meshes

Hello guys! Im creating a top down shooter game and i would like to know if there is a way to fade for example roofs of buildings when i enter them! Thank you on front! :slight_smile:

Does this help?

im new with unreal engine 4 so materials inside function? how can i make material transulent? I made this so far and i want it to untoggle when i step out of boxtrigger at first and then if is possible to make it fade slowly

If you are new to UE, you should learn the basics first in how to create a material etc. This is not done in blueprint. Watch some basic tutorials on how to trigger stuff using Blueprints