| referencePointsOut | A list of ReferencePoints containing all reference points. |
Retrieves all ReferencePoints added by calls to XRReferencePointSubsystem.TryAddReferencePoint.
Existing data is replaced with a list of the current reference points.
To avoid excessive heap allocations, developers may reuse the same list each call. A reallocation only happens
when the list's capacity is insufficient.
If referencePointsOut is null, this method throws ArgumentNullException.