resetTracking

By default, when you call the run(_:options:) method on a session that has run before or is already running, the session resumes device position tracking from its last known state. (For example, an ARAnchor object keeps its apparent position relative to the camera.) When you call the run(_:options:) method with a configuration of the same type as the session's current configuration, you can add this option to force device position tracking to return to its initial state.

When you call the run(_:options:) method with a configuration of a different type than the session's current configuration, the session always resets tracking (that is, this option is implicitly enabled).

In either case, when you reset tracking, ARKit also removes any existing anchors from the session.