NVIDIA® PhysX®
Unity contains the powerful NVIDIA® PhysX® next-gen Physics Engine.
Cloth
New in Unity 3 are two kinds of cloth: Fully physically simulated Interactive Cloth that interacts fully with the rest of the environment. The other, Skinned Cloth, is an optimized solution for garments on animated characters. You can use it for animated shirts, trousers, skirts, capes and hair in a physically accurate way. It is highly optimized and can handle high poly animated cloth pieces.
Soft Bodies
Unity 3 lets you make soft bodies of objects – so you can make nice semi-deflated beach balls that interact realistically with the environment.
Rigidbodies
Unity supports full Rigidbody physics. Rigidbodies enable your GameObjects to act under the control of physics. The Rigidbody can receive forces and torque to make your objects move in a realistic way with no scripting required.
Ragdolls
Unity comes with a ragdoll wizard that lets you set up a full ragdoll from animated character in seconds. You can tweak the ragdoll as needed for unique behaviors.
Joints
Hinges, springs, ball-sockets, character limbs, and the fully-customizable Configurable Joint. Make them breakable to allow emergent game play.
Cars
Creating blazing fast racing games and mountable vehicles has never been easier. Unity has a dedicated Wheel Collider that accurately simulates the traction model of real car tires.