Continuous collision используется для обнаружения столкновений со статической сеткой геометрии.
Collisions will be detected for any static mesh geometry in the path of this Rigidbody, even if the collision occurs between two FixedUpdate steps. Static mesh geometry is any MeshCollider which does not have a Rigidbody attached. This also prevent Rigidbodies set to ContinuousDynamic mode from passing through this Rigidbody.