Physics

Unreal Engine 3 uses the PhysX physics engine to drive its physical simulation calculations. PhysX provides the ability to perform accurate collision detection as well as simulate physical interactions between objects within the world. Having physics in your game will help improve the immersion value of every scene, as it helps players believe that they are interacting with the scene and that the scene is responding back in some way or another.

PhysX cloth allows you to simulate long flowing capes for your heroes or long, tearable flags. Using PhysX soft bodies, you can simulate flexible bodies that bend and twist as the player prods it. It is also possible to create physically interactive fog, or other complex physical particle simulations. And all this, in real time.