The Rigidbody's collision detection mode.
Use this to set up a Rigidbody's for continuous collision detection, which is used to prevent fast moving objects from passing through other objects without detecting collisions. For best results, set this value to CollisionDetectionMode.ContinuousDynamic for fast moving objects, and for other objects which these need to collide with, set it to CollisionDetectionMode.Continuous. This has a big impact on physics performance, so just leave it set to the default value of CollisionDetectionMode.Discrete, if you don't have any issues with collisions of fast objects. Continuous Collision Detection is only supported for Rigidbodies with Sphere-, Capsule- or BoxColliders. See Also: CollisionDetectionMode.