PROSAGA码农传奇-虚拟现实VR-SceneKit VR中的相机移动

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  <P>
    此代码将适应您的设备方向...它基本上是一个sphereNode，中间有一个cameraNode。 Core Motion控制摄像机视图。
  </p>
   <pre>
    <code>
      import UIKit
import SceneKit
import CoreMotion
import SpriteKit
import AVFoundation

class Video360VC: UIViewController {

@IBOutlet weak var sceneView: SCNView!

let motionManager = CMMotionManager()
    let cameraNode = SCNNode()
    var player: AVPlayer?

override func viewDidLoad() {
        super.viewDidLoad()
        startSelected()
    }

func startNewPlayer(fileURL: URL, fileURLSub: URL){
        player = AVPlayer(url: fileURL)
        let videoNode = SKVideoNode(avPlayer: player!)
        let size = CGSize(width: 4096, height: 2048)

videoNode.size = size
        videoNode.position = CGPoint(x: size.width/2, y: size.height/2)

let spriteScene = SKScene(size: size)
        spriteScene.scaleMode = .resizeFill
        spriteScene.addChild(videoNode)

let sphereNode = createSphereNode(material:spriteScene)
        configureScene(node: sphereNode)
        guard motionManager.isDeviceMotionAvailable else {
            fatalError("Device motion is not available")
        }

startCameraTracking()
        player?.isMuted = true
        player?.play()
    }

func createSphereNode(material: AnyObject?) -> SCNNode {
        let sphere = SCNSphere(radius: 20.0)
        sphere.firstMaterial!.isDoubleSided = true
        sphere.firstMaterial!.diffuse.contents = material
        let sphereNode = SCNNode(geometry: sphere)
        sphereNode.position = SCNVector3Make(0,0,0)
        sphereNode.rotation = SCNVector4Make(1, 0, 0, Float.pi)
        return sphereNode
    }

func configureScene(node sphereNode: SCNNode) {
        // Set the scene
        let scene = SCNScene()
        sceneView.scene = scene

//test mode help
        sceneView.showsStatistics = false
        sceneView.allowsCameraControl = false

// Camera, ...
        cameraNode.camera = SCNCamera()
        cameraNode.position = SCNVector3Make(0, 0, 0)
        scene.rootNode.addChildNode(sphereNode)
        scene.rootNode.addChildNode(cameraNode)
    }

func startCameraTracking() {
        motionManager.deviceMotionUpdateInterval = 1.0 / 60.0
        motionManager.startDeviceMotionUpdates(to: OperationQueue.main) {
            [weak self](data: CMDeviceMotion?, error: Error?) in
            guard let data = data else { return }

self?.cameraNode.camera?.fieldOfView = 90
            self?.cameraNode.orientation = data.gaze(atOrientation: .landscapeRight)
        }
    }
}

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 orientation {

case .landscapeRight:

let cq = GLKQuaternionMakeWithAngleAndAxis(Float(Float.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(-Float.pi), 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(Float.pi), 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(-Float.pi), 1, 0, 0)
            let q = GLKQuaternionMultiply(cq, aq)

final = SCNVector4(x: q.x, y: q.y, z: q.z, w: q.w)

default:
            print("Default")
        }

return final
    }
}

</code>
  </pre>
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