can i access a static mesh without converting it to a actor?

im trying third person template and i want fade multiple static mesh when camera overlaps/collide it. but i can’t access it directly.
i want to change that static mesh material to transparent one directly at that time and after overlap ends, materials are reset back to normal one.

If I understood it correctly, you’re looking for a way to prevent camera clipping when geometry gets in the way. Here’s a great method to achieve this effect: