# Sandbox.ScenePhysicsMode

Which physics simulation a [Sandbox.Scene](/api/Sandbox.Scene) runs. For use with [Sandbox.Scene.PhysicsMode](/api/Sandbox.Scene/PhysicsMode).

- Kind: enum
- Namespace: `Sandbox`
- Assembly: `Sandbox.Engine`
- Modifiers: sealed

## Fields

- [`Physics2D`](/api/Sandbox.ScenePhysicsMode/Physics2D): 2D physics, simulated by Box2D. Bodies are constrained to a single plane.
- [`Physics3D`](/api/Sandbox.ScenePhysicsMode/Physics3D): Full 3D rigid body physics. This is the default.