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# preferredDevice

The device to use for Metal rendering.

```
static let preferredDevice: SCNView.Option
```

## Discussion

The value for this key is a <doc://com.apple.documentation/documentation/Metal/MTLDevice> object.

Use this key to choose a specific device for rendering (for example, on a macOS system with multiple GPUs), or leave it unspecified to allow SceneKit to automatically choose a device.

---

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