I'm pretty sure this is a duplicate. I'm just not sure how to describe it to someone else.
Here's what i'm trying to do: I am creating a simulation with a cube, and a "bullet" going through it to make it fracture. It is a rigid body, but when I play the simulation, it just falls (not through the world, I have a plane that it stands on). I want it to start simulating when the bullet passes through it so it "fracture". Help will be very appreciated, thanks!