Class ARAnchorManager

Manages anchors.

Inheritance
Object
UnityEngine.Object
UnityEngine.Component
UnityEngine.Behaviour
UnityEngine.MonoBehaviour
SubsystemLifecycleManager<XRAnchorSubsystem, XRAnchorSubsystemDescriptor, XRAnchorSubsystem.Provider>
ARTrackableManager<XRAnchorSubsystem, XRAnchorSubsystemDescriptor, XRAnchorSubsystem.Provider, XRAnchor, ARAnchor>
ARAnchorManager
Inherited Members
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UnityEngine.MonoBehaviour.CancelInvoke()
UnityEngine.MonoBehaviour.Invoke(System.String, System.Single)
UnityEngine.MonoBehaviour.InvokeRepeating(System.String, System.Single, System.Single)
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UnityEngine.MonoBehaviour.StartCoroutine(System.String)
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Namespace: UnityEngine.XR.ARFoundation
Syntax
[DefaultExecutionOrder(-2147483647)]
[DisallowMultipleComponent]
[RequireComponent(typeof(XROrigin))]
public sealed class ARAnchorManager : ARTrackableManager<XRAnchorSubsystem, XRAnchorSubsystemDescriptor, XRAnchorSubsystem.Provider, XRAnchor, ARAnchor>
Remarks

Use this component to programmatically add, remove, or query for anchors. Anchors are Poses in the world which will be periodically updated by an AR device as its understanding of the world changes.

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

Properties

anchorPrefab

This prefab will be instantiated for each ARAnchor. May be null.

Declaration
public GameObject anchorPrefab { get; set; }
Property Value
Type Description
UnityEngine.GameObject
Remarks

The purpose of this property is to extend the functionality of ARAnchors. It is not the recommended way to instantiate content associated with an ARAnchor.

gameObjectName

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

Declaration
protected override string gameObjectName { get; }
Property Value
Type Description
String
Overrides
UnityEngine.XR.ARFoundation.ARTrackableManager<UnityEngine.XR.ARSubsystems.XRAnchorSubsystem, UnityEngine.XR.ARSubsystems.XRAnchorSubsystemDescriptor, UnityEngine.XR.ARSubsystems.XRAnchorSubsystem.Provider, UnityEngine.XR.ARSubsystems.XRAnchor, UnityEngine.XR.ARFoundation.ARAnchor>.gameObjectName

Methods

AddAnchor(Pose)

Attempts to add an ARAnchor with the given Pose.

Declaration
[Obsolete("Add an anchor using AddComponent<ARAnchor>(). (2020-10-06)")]
public ARAnchor AddAnchor(Pose pose)
Parameters
Type Name Description
UnityEngine.Pose pose

The pose, in Unity world space, of the ARAnchor.
Returns
Type Description
ARAnchor

A new ARAnchor if successful, otherwise null.
Remarks

If GetPrefab() is not null, a new instance of that prefab will be instantiated. Otherwise, a new GameObject will be created. In either case, the resulting GameObject will have an ARAnchor component on it.

Exceptions
Type Condition
InvalidOperationException

Thrown if this MonoBehaviour is not enabled.
InvalidOperationException

Thrown if the underlying subsystem is null.

AttachAnchor(ARPlane, Pose)

Attempts to create a new anchor that is attached to an existing ARPlane.

Declaration
public ARAnchor AttachAnchor(ARPlane plane, Pose pose)
Parameters
Type Name Description
ARPlane plane

The ARPlane to which to attach.
UnityEngine.Pose pose

The initial Pose, in Unity world space, of the anchor.
Returns
Type Description
ARAnchor

A new ARAnchor if successful, otherwise null.

GetAnchor(TrackableId)

Gets the ARAnchor with given trackableId, or null if it does not exist.

Declaration
public ARAnchor GetAnchor(TrackableId trackableId)
Parameters
Type Name Description
TrackableId trackableId

The TrackableId of the ARAnchor to retrieve.
Returns
Type Description
ARAnchor

The ARAnchor with trackableId or null if it does not exist.

GetPrefab()

Get the prefab to instantiate for each ARAnchor.

Declaration
protected override GameObject GetPrefab()
Returns
Type Description
UnityEngine.GameObject

The prefab to instantiate for each ARAnchor.
Overrides
UnityEngine.XR.ARFoundation.ARTrackableManager<UnityEngine.XR.ARSubsystems.XRAnchorSubsystem, UnityEngine.XR.ARSubsystems.XRAnchorSubsystemDescriptor, UnityEngine.XR.ARSubsystems.XRAnchorSubsystem.Provider, UnityEngine.XR.ARSubsystems.XRAnchor, UnityEngine.XR.ARFoundation.ARAnchor>.GetPrefab()

OnTrackablesChanged(List<ARAnchor>, List<ARAnchor>, List<ARAnchor>)

Invoked when the base class detects trackable changes.

Declaration
protected override void OnTrackablesChanged(List<ARAnchor> added, List<ARAnchor> updated, List<ARAnchor> removed)
Parameters
Type Name Description
List<ARAnchor> added

The list of added anchors.
List<ARAnchor> updated

The list of updated anchors.
List<ARAnchor> removed

The list of removed anchors.
Overrides
UnityEngine.XR.ARFoundation.ARTrackableManager<UnityEngine.XR.ARSubsystems.XRAnchorSubsystem, UnityEngine.XR.ARSubsystems.XRAnchorSubsystemDescriptor, UnityEngine.XR.ARSubsystems.XRAnchorSubsystem.Provider, UnityEngine.XR.ARSubsystems.XRAnchor, UnityEngine.XR.ARFoundation.ARAnchor>.OnTrackablesChanged(System.Collections.Generic.List<UnityEngine.XR.ARFoundation.ARAnchor>, System.Collections.Generic.List<UnityEngine.XR.ARFoundation.ARAnchor>, System.Collections.Generic.List<UnityEngine.XR.ARFoundation.ARAnchor>)

RemoveAnchor(ARAnchor)

Attempts to remove an ARAnchor.

Declaration
[Obsolete("Call Destroy() on the ARAnchor component to remove it. (2020-10-06)")]
public bool RemoveAnchor(ARAnchor anchor)
Parameters
Type Name Description
ARAnchor anchor

The anchor you wish to remove.
Returns
Type Description
Boolean

True if the anchor was successfully removed. False usually means the anchor is not longer tracked by the system.

Events

anchorsChanged

Invoked once per frame to communicate changes to anchors, including new anchors, the update of existing anchors, and the removal of previously existing anchors.

Declaration
public event Action<ARAnchorsChangedEventArgs> anchorsChanged
Event Type
Type Description
Action<ARAnchorsChangedEventArgs>

See Also

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