Creates a new anchor object with the specified transform.
- iOS 11.0+
A matrix encoding the position, orientation, and scale of the anchor relative to the world coordinate space of the AR session the anchor is placed in.
World coordinate space in ARKit always follows a right-handed convention, but is oriented based on the session configuration. For details, see Understanding World Tracking.
add(anchor:) method to begin tracking your custom anchor in an AR session.