Created
March 1, 2022 17:32
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Cenatus PHASE blog post snippet 15
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| import CoreMotion | |
| // [ Elided other imports ] | |
| class ViewController: UIViewController, ARSession { // [ Elided other protocols ] | |
| let hmm = CMHeadphoneMotionManager() | |
| var deviceTransform: simd_float4x4 = matrix_identity_float4x4; | |
| var headphoneTransform: simd_float4x4 = matrix_identity_float4x4; | |
| override func viewDidLoad() { | |
| hmm.startDeviceMotionUpdates(to: OperationQueue.current!, withHandler: {[weak self] motion, error in | |
| guard let motion = motion, error == nil else { return } | |
| self?.handleHeadMovement(motion) | |
| }) | |
| // [ Elided rest of method body] | |
| } | |
| func handleHeadMovement(_ motion: CMDeviceMotion) { | |
| let m = motion.attitude.rotationMatrix | |
| let x = SIMD4(Float(m.m11), Float(m.m21), Float(m.m31), 0) | |
| let y = SIMD4(Float(m.m12), Float(m.m22), Float(m.m32), 0) | |
| let z = SIMD4(Float(m.m13), Float(m.m23), Float(m.m33), 0) | |
| let w = SIMD4(Float(0), Float(0), Float(0), Float(1)) | |
| self.headphoneTransform = simd_float4x4(columns: (x, y, z, w)) | |
| phaseListener.transform = deviceTransform * headphoneTransform | |
| } | |
| func session(_ session: ARSession, didUpdate frame: ARFrame) { | |
| self.deviceTransform = frame.camera.transform | |
| phaseListener.transform = deviceTransform * headphoneTransform | |
| } | |
| // [ Elided rest of class body] | |
| } |
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