You could use a “Multi Line trace by channel” node. It will trace through everything and ignore whatever you put into the “Actors to ignore” array. You cast the hit actor to the box blueprint i’m assuming you have created and call the Explode event you made. here’s the documentation for Raycasts : https://docs.unrealengine.com/latest/INT/Gameplay/HowTo/UseRaycasts/Blueprints/index.html#multilinetrace