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# ARObjectAnchor

An anchor for a real-world 3D object that ARKit detects in the physical environment.

```
class ARObjectAnchor
```

## Overview

When you run a world-tracking AR session and specify [`ARReferenceObject`](/documentation/ARKit/ARReferenceObject) objects for the session configuration’s [`detectionObjects`](/documentation/ARKit/ARWorldTrackingConfiguration/detectionObjects) property, ARKit searches for those objects in the real-world environment. When the session recognizes an object, it automatically adds to its list of anchors an [`ARObjectAnchor`](/documentation/ARKit/ARObjectAnchor) for each detected object.

To place virtual 3D content that matches the position or size of the detected object, use the anchor’s inherited [`transform`](/documentation/ARKit/ARAnchor/transform) property together with the [`center`](/documentation/ARKit/ARReferenceObject/center) and [`extent`](/documentation/ARKit/ARReferenceObject/extent) of the anchor’s [`referenceObject`](/documentation/ARKit/ARObjectAnchor/referenceObject).

## Topics

### Identifying Detected Objects

[`referenceObject`](/documentation/ARKit/ARObjectAnchor/referenceObject)

The detected object referenced by the object anchor.


---

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