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# ARSCNFaceGeometry

A SceneKit representation of face topology for use with face information that an AR session provides.

```
class ARSCNFaceGeometry
```

## Overview

This class is a subclass of <doc://com.apple.documentation/documentation/SceneKit/SCNGeometry> that wraps the mesh data provided by the [`ARFaceGeometry`](/documentation/ARKit/ARFaceGeometry) class. You can use [`ARSCNFaceGeometry`](/documentation/ARKit/ARSCNFaceGeometry) to quickly and easily visualize face topology and facial expressions provided by ARKit in a SceneKit view.

> Important:
> ``doc://com.apple.arkit/documentation/ARKit/ARSCNFaceGeometry`` is available only in SceneKit views or renderers that use Metal. This class is not supported for OpenGL-based SceneKit rendering.

Face mesh topology is constant for the lifetime of an [`ARSCNFaceGeometry`](/documentation/ARKit/ARSCNFaceGeometry) object. That is, the geometry’s single <doc://com.apple.documentation/documentation/SceneKit/SCNGeometryElement> object always describes the same arrangement of vertices, and the <doc://com.apple.documentation/documentation/SceneKit/SCNGeometrySource/Semantic-swift.struct/texcoord> geometry source always maps the same vertices to the same texture coordinates.

When you modify the geometry with the [`update(from:)`](/documentation/ARKit/ARSCNFaceGeometry/update(from:)) method, only the contents of the <doc://com.apple.documentation/documentation/SceneKit/SCNGeometrySource/Semantic-swift.struct/vertex> geometry source change, indicating the difference in vertex positions as ARKit adapts the mesh to the shape and expression of the user’s face.

## Topics

### Creating a Geometry

[`init(device:)`](/documentation/ARKit/ARSCNFaceGeometry/init(device:))

Creates a SceneKit face geometry for rendering with the specified Metal device object.

[`init(device:fillMesh:)`](/documentation/ARKit/ARSCNFaceGeometry/init(device:fillMesh:))

Creates a SceneKit face geometry, optionally filling in gaps in the mesh for the eyes and mouth.

### Updating the Geometry

[`update(from:)`](/documentation/ARKit/ARSCNFaceGeometry/update(from:))

Deforms the SceneKit geometry to match the specified face mesh.


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