Does adding anchors everywhere force ARKit to keep a good understanding and reduce drift everywhere? If yes, will this affect the tracking quality?

ARKit offers functionality to add custom anchors which is the preferred and recommended way to place content.

See the add(anchor:) method.

Custom anchors are used internally for drift correction. We cannot guarantee absolutely no drift. However, using your own anchors will use the system's best knowledge to correct for any drift.

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