我有使用AR套件识别图像的功能，当检测到图像时，我需要在呈现的场景上显示和播放视频（如检测到的图像上方）？
lazy var fadeAndSpinAction: SCNAction = {
return .sequence([
.fadeIn(duration: fadeDuration),
.rotateBy(x: 0, y: 0, z: CGFloat.pi * 360 / 180, duration: rotateDuration),
.wait(duration: waitDuration),
.fadeOut(duration: fadeDuration)
])
}()
lazy var fadeAction: SCNAction = {
return .sequence([
.fadeOpacity(by: 0.8, duration: fadeDuration),
.wait(duration: waitDuration),
.fadeOut(duration: fadeDuration)
])
}()
lazy var fishNode: SCNNode = {
guard let scene = SCNScene(named: "Catfish1.scn"),
let node = scene.rootNode.childNode(withName: "Catfish1", recursively: false) else { return SCNNode() }
let scaleFactor = 0.005
node.scale = SCNVector3(scaleFactor, scaleFactor, scaleFactor)
node.eulerAngles.x = -.pi / 2
return node
}()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
sceneView.delegate = self
configureLighting()
}
func configureLighting() {
sceneView.autoenablesDefaultLighting = true
sceneView.automaticallyUpdatesLighting = true
}
override func viewWillAppear(_ animated: Bool) {
resetTrackingConfiguration()
}
func resetTrackingConfiguration() {
guard let referenceImages = ARReferenceImage.referenceImages(inGroupNamed: "AR Resources", bundle: nil) else { return }
let configuration = ARWorldTrackingConfiguration()
configuration.detectionImages = referenceImages
let options: ARSession.RunOptions = [.resetTracking, .removeExistingAnchors]
sceneView.session.run(configuration, options: options)
statusLabel.text = "Move camera around to detect images"
}
extension ViewController: ARSCNViewDelegate {
func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
DispatchQueue.main.async {
guard let imageAnchor = anchor as? ARImageAnchor,
let imageName = imageAnchor.referenceImage.name else { return }
// TODO: Overlay 3D Object
let overlayNode = self.getNode(withImageName: imageName)
overlayNode.opacity = 0
overlayNode.position.y = 0.2
overlayNode.runAction(self.fadeAndSpinAction)
node.addChildNode(overlayNode)
self.statusLabel.text = "Image detected: \"\(imageName)\""
self.videoNode.geometry = SCNPlane(width: 1276.0 / 2.0, height: 712.0 / 2.0)
self.spriteKitScene.scaleMode = .aspectFit
self.videoSpriteKitNode?.position = CGPoint(x: self.spriteKitScene.size.width / 2.0, y: self.spriteKitScene.size.height / 2.0)
self.videoSpriteKitNode?.size = self.spriteKitScene.size
self.spriteKitScene.addChild(self.videoSpriteKitNode!)
self.videoNode.geometry?.firstMaterial?.diffuse.contents = self.spriteKitScene
var transform = SCNMatrix4MakeRotation(Float(M_PI), 0.0, 0.0, 1.0)
transform = SCNMatrix4Translate(transform, 1.0, 1.0, 0)
self.videoNode.geometry?.firstMaterial?.diffuse.contentsTransform = transform
self.videoNode.position = SCNVector3(x: 0, y: 30, z: 7)
node.addChildNode(self.videoNode)
self.videoSpriteKitNode?.play()
}
}
func getPlaneNode(withReferenceImage image: ARReferenceImage) -> SCNNode {
let plane = SCNPlane(width: image.physicalSize.width,
height: image.physicalSize.height)
let node = SCNNode(geometry: plane)
return node
}`
答案 0 :(得分：10)
看看您的代码，首先将SCNPlane设置为638米宽和356米高，我确定那不是您真正想要的^ ________ ^。
无论如何，下面是一个使用SKScene和SKVideoNode播放本地视频的示例，该示例效果很好：
//--------------------------
// MARK: - ARSCNViewDelegate
//--------------------------
extension ViewController: ARSCNViewDelegate {
func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
//1. Check We Have An ARImageAnchor And Have Detected Our Reference Image
guard let imageAnchor = anchor as? ARImageAnchor else { return }
let referenceImage = imageAnchor.referenceImage
//2. Get The Physical Width & Height Of Our Reference Image
let width = CGFloat(referenceImage.physicalSize.width)
let height = CGFloat(referenceImage.physicalSize.height)
//3. Create An SCNNode To Hold Our Video Player With The Same Size As The Image Target
let videoHolder = SCNNode()
let videoHolderGeometry = SCNPlane(width: width, height: height)
videoHolder.transform = SCNMatrix4MakeRotation(-Float.pi / 2, 1, 0, 0)
videoHolder.geometry = videoHolderGeometry
//4. Create Our Video Player
if let videoURL = Bundle.main.url(forResource: "BlackMirrorz", withExtension: "mp4"){
setupVideoOnNode(videoHolder, fromURL: videoURL)
}
//5. Add It To The Hierarchy
node.addChildNode(videoHolder)
}
/// Creates A Video Player As An SCNGeometries Diffuse Contents
///
/// - Parameters:
/// - node: SCNNode
/// - url: URL
func setupVideoOnNode(_ node: SCNNode, fromURL url: URL){
//1. Create An SKVideoNode
var videoPlayerNode: SKVideoNode!
//2. Create An AVPlayer With Our Video URL
let videoPlayer = AVPlayer(url: url)
//3. Intialize The Video Node With Our Video Player
videoPlayerNode = SKVideoNode(avPlayer: videoPlayer)
videoPlayerNode.yScale = -1
//4. Create A SpriteKitScene & Postion It
let spriteKitScene = SKScene(size: CGSize(width: 600, height: 300))
spriteKitScene.scaleMode = .aspectFit
videoPlayerNode.position = CGPoint(x: spriteKitScene.size.width/2, y: spriteKitScene.size.height/2)
videoPlayerNode.size = spriteKitScene.size
spriteKitScene.addChild(videoPlayerNode)
//6. Set The Nodes Geoemtry Diffuse Contenets To Our SpriteKit Scene
node.geometry?.firstMaterial?.diffuse.contents = spriteKitScene
//5. Play The Video
videoPlayerNode.play()
videoPlayer.volume = 0
}
}
更新：
如果要将视频放置在目标上方，则可以执行以下操作：
func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
//1. Check We Have An ARImageAnchor And Have Detected Our Reference Image
guard let imageAnchor = anchor as? ARImageAnchor else { return }
let referenceImage = imageAnchor.referenceImage
//2. Get The Physical Width & Height Of Our Reference Image
let width = CGFloat(referenceImage.physicalSize.width)
let height = CGFloat(referenceImage.physicalSize.height)
//3. Create An SCNNode To Hold Our Video Player
let videoHolder = SCNNode()
let planeHeight = height/2
let videoHolderGeometry = SCNPlane(width: width, height: planeHeight)
videoHolder.transform = SCNMatrix4MakeRotation(-Float.pi / 2, 1, 0, 0)
videoHolder.geometry = videoHolderGeometry
//4. Place It About The Target
let zPosition = height - (planeHeight/2)
videoHolder.position = SCNVector3(0, 0, -zPosition)
//5. Create Our Video Player
if let videoURL = Bundle.main.url(forResource: "BlackMirrorz", withExtension: "mp4"){
setupVideoOnNode(videoHolder, fromURL: videoURL)
}
//5. Add It To The Hierachy
node.addChildNode(videoHolder)
}
希望有帮助...