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# update(from:)

Deforms the SceneKit geometry to match the specified face mesh.

```
func update(from faceGeometry: ARFaceGeometry)
```

## Parameters

`faceGeometry`

A coarse mesh representation of a face’s topology, dimensions, and expression.

## Discussion

To update a SceneKit model of a face actively tracked in an AR session, call this method in your [`ARSCNViewDelegate`](/documentation/ARKit/ARSCNViewDelegate) object’s [`renderer(_:didUpdate:for:)`](/documentation/ARKit/ARSCNViewDelegate/renderer(_:didUpdate:for:)) callback, passing the [`geometry`](/documentation/ARKit/ARFaceAnchor/geometry) property from the [`ARFaceAnchor`](/documentation/ARKit/ARFaceAnchor) object that callback provides.

Alternatively, you can create, configure, and visualize face models independent of an AR session by creating face geometry objects using the [`ARFaceGeometry`](/documentation/ARKit/ARFaceGeometry) [`init(blendShapes:)`](/documentation/ARKit/ARFaceGeometry/init(blendShapes:)) initializer and passing them to this method.

---

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