Skip to main content
Version: 3.0

class ARPersistentAnchorManager

(Niantic.Lightship.AR.PersistentAnchors.ARPersistentAnchorManager)

Overview​

Manages persistent anchors.

	class ARPersistentAnchorManager: ARTrackableManager< XRPersistentAnchorSubsystem, XRPersistentAnchorSubsystemDescriptor, XRPersistentAnchorSubsystem.Provider, XRPersistentAnchor, ARPersistentAnchor > {
	public:
		// events
	
		event arPersistentAnchorStateChanged();

		// methods
	
		bool GetVpsSessionId(out string vpsSessionId);
	
		bool TryTrackAnchor(
			ARPersistentAnchorPayload payload,
			out ARPersistentAnchor arPersistentAnchor
		);
	
		void DestroyAnchor(ARPersistentAnchor arPersistentAnchor);

	protected:
		// fields
	
		 bool InterpolateAnchors = false;
		 bool TemporalFusionEnabled = false;
		 override string gameObjectName => "Persistent Anchor";

		// methods
	
		override GameObject GetPrefab();
		override void OnEnable();
		virtual void Start();
		override void OnDisable();
		override void OnDestroy();
	
		override void OnTrackablesChanged(
			List<ARPersistentAnchor> added,
			List<ARPersistentAnchor> updated,
			List<ARPersistentAnchor> removed
		);
	};

	// direct descendants

	class ARLocationManager;

Detailed Documentation​

Manages persistent anchors.

Use this component to programmatically restore, remove, or query for persistent anchors. Persistent anchors are persistent Poses in the world that are generated by processed scans, and will be in the same real world location in future sessions. By placing virtual content relative to a Persistent Anchor, it can be restored to the same real world location in a future session.

This is a low level API to manage Persistent Anchors. For authoring virtual content in the Unity Editor, use the ARLocationManager and ARLocations instead.

Subscribe to changes (added, updated, and removed) via the ARPersistentAnchorManager.arPersistentAnchorStateChanged event.

    See also:

    ARTrackableManager<TSubsystem,TSubsystemDescriptor,TProvider,TSessionRelativeData,TTrackable>

Fields​

gameObjectName​

override string gameObjectName => "Persistent Anchor"

The name to assign to the GameObject instantiated for each ARPersistentAnchor.

Events​

arPersistentAnchorStateChanged​

event arPersistentAnchorStateChanged()

Called when the state of an anchor has changed

Each invocation of this event contains a single Persistent Anchor that has had a state or pose change this frame. Query the arg's arPersistentAnchor's TrackingState to determine its new TrackingState. Query the arPersistentAnchor's PredictedPose to determine its new PredictedPose.

Methods​

GetPrefab​

override GameObject GetPrefab()

The prefab to use when creating an ARPersistentAnchor. If null, a new GameObject will be created.

OnTrackablesChanged​

override void OnTrackablesChanged(
		List<ARPersistentAnchor> added,
		List<ARPersistentAnchor> updated,
		List<ARPersistentAnchor> removed
	)

Invoked when the base class detects trackable changes.

    Parameters:

    added - The list of added anchors.

    updated - The list of updated anchors.

    removed - The list of removed anchors.

GetVpsSessionId​

bool GetVpsSessionId(out string vpsSessionId)

Gets the vps session id (as 32 character hexidecimal upper-case string) A vps session is defined between first TryTrackAnchor and last DestroyAnchor for a given set of anchors

    Parameters:

    vpsSessionId - The vps session id as 32 character hexidecimal upper-case string

    Returns:

    True If vps session id can be obtained False If no vps session is running

TryTrackAnchor​

bool TryTrackAnchor(
		ARPersistentAnchorPayload payload,
		out ARPersistentAnchor arPersistentAnchor
	)

Restores a Persistent Anchor from a Payload. The Anchor GameObject will be returned immediately, and children can be added to it, but a proper position and rotation not be applied until its TrackingState is Tracking.

    Parameters:

    payload - The payload of the anchor to restore

    arPersistentAnchor - The ARPersistentAnchor that was created from the payload

    Returns:

    True If the anchor was successfully added for tracking. False The anchor cannot be added, it is either already added, or the payload is invalid

DestroyAnchor​

void DestroyAnchor(ARPersistentAnchor arPersistentAnchor)

Destroys an anchor and stop tracking it.

    Parameters:

    arPersistentAnchor - The anchor to destroy