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Determine the direction of "gaze" of the device in any orientation
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| extension CMDeviceMotion { | |
| func gaze(atOrientation orientation: UIInterfaceOrientation) -> SCNVector4 { | |
| let attitude = self.attitude.quaternion | |
| let aq = GLKQuaternionMake(Float(attitude.x), Float(attitude.y), Float(attitude.z), Float(attitude.w)) | |
| let final: SCNVector4 | |
| switch UIApplication.sharedApplication().statusBarOrientation { | |
| case .LandscapeRight: | |
| let cq = GLKQuaternionMakeWithAngleAndAxis(Float(M_PI_2), 0, 1, 0) | |
| let q = GLKQuaternionMultiply(cq, aq) | |
| final = SCNVector4(x: -q.y, y: q.x, z: q.z, w: q.w) | |
| case .LandscapeLeft: | |
| let cq = GLKQuaternionMakeWithAngleAndAxis(Float(-M_PI_2), 0, 1, 0) | |
| let q = GLKQuaternionMultiply(cq, aq) | |
| final = SCNVector4(x: q.y, y: -q.x, z: q.z, w: q.w) | |
| case .PortraitUpsideDown: | |
| let cq = GLKQuaternionMakeWithAngleAndAxis(Float(M_PI_2), 1, 0, 0) | |
| let q = GLKQuaternionMultiply(cq, aq) | |
| final = SCNVector4(x: -q.x, y: -q.y, z: q.z, w: q.w) | |
| case .Unknown: | |
| fallthrough | |
| case .Portrait: | |
| let cq = GLKQuaternionMakeWithAngleAndAxis(Float(-M_PI_2), 1, 0, 0) | |
| let q = GLKQuaternionMultiply(cq, aq) | |
| final = SCNVector4(x: q.x, y: q.y, z: q.z, w: q.w) | |
| } | |
| return final | |
| } | |
| } |
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