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All the tutorials that I've found online speak about using Metal alone, without any other supporting library. But I don't understand if it's possible to create a SceneKit game and then use a Metal layer just to make some optimizations.

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Yup! As of iOS 9, you can set a SceneKit SCNView to use a Metal renderer on devices that support it by initializing it with the SCNPreferredRenderingAPIKey key in the options dictionary, as described here. Something along these lines should work:

let sceneView = SCNView(frame: someFrame, options:[SCNPreferredRenderingAPIKey: NSNumber(unsignedInteger: SCNRenderingAPI.Metal)])

That’s pretty much all you need to do; the way you interact with the rest of the API remains unchanged.

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