如何以编程方式将 COLLADA(.dae) 文件更改为 SceneKit(.scn) 文件 Swift

Question

COLLADA(.dae) , SceneKit(.scn)

我正在与scenekit 合作，问题是有一个管理员会将.dae 文件上传到服务器，我将在应用程序中获取该链接，并且通过使用代码我必须在相机上显示它。在为 .scn 文件 url 运行应用程序时，它工作正常，但对于 .dae 文件 url，它会生成错误 COLLADA files are not supported on this platform. 所以我想在运行时将 .dae 文件转换为 .scn 文件。如果有人知道可以将.dae 文件转换为.scn 文件的任何其他来源，请提及。通过此源管理员将在转换后将.scn 文件上传到服务器。

Answer 1

感谢 stackoverflow 使用 Model I/O swift 概念解决了

第一步#

// first need to download file to local directory
func downloadSceneTask(){
    
    //1. Get The URL Of The SCN File
    guard let url = URL(string: "Your_url") else { return }
    
    //2. Create The Download Session
    let downloadSession = URLSession(configuration: URLSession.shared.configuration, delegate: self, delegateQueue: nil)
    
    //3. Create The Download Task & Run It
    let downloadTask = downloadSession.downloadTask(with: url)
    downloadTask.resume()
}

第二步#

现在我已将 url 保存在本地设备内存中，现在我将单击相机中的任意位置并将该本地 url 加载到场景中。

func addTapGestureToSceneView() {
    let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(didReceiveTapGesture(_:)))
    sceneView.addGestureRecognizer(tapGestureRecognizer)
}

@objc func didReceiveTapGesture(_ sender: UITapGestureRecognizer) {
    let location = sender.location(in: sceneView)
    guard let hitTestResult = sceneView.hitTest(location, types: [.featurePoint, .estimatedHorizontalPlane]).first
        else { return }
    let results = self.sceneView.hitTest(location, types: .featurePoint)

    // 2
    guard let result = results.first else {
        return
    }
    // 3
    let translation = result.worldTransform.translation
    self.translation = translation
    anchor = ARAnchor(transform: hitTestResult.worldTransform)
    sceneView.session.add(anchor: anchor!)
}

第三步#

我的 ViewDidLoad 函数是这样的

override func viewDidLoad() {
    super.viewDidLoad()
    sceneView.delegate = self
    addTapGestureToSceneView()
    downloadSceneTask()
}

第四步#

添加协议 ARSCNViewDelegate

// Getting file from local directory and load
extension ViewController: ARSCNViewDelegate {

   func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
       guard !(anchor is ARPlaneAnchor) else { return }
       if let droneNode = loadModel() {
           DispatchQueue.main.async {
               node.addChildNode(droneNode)
           }
       }
   }

   func getDocumentsDirectory() -> URL {
       let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
       let documentsDirectory = paths[0]
       return documentsDirectory

   }

   // Loads The SCNFile From The Documents Directory
   func loadModel() -> SCNNode? {
       //1. Get The Path Of The Downloaded File
       let downloadedScenePath = getDocumentsDirectory().appendingPathComponent("table.obj")
       let asset = MDLAsset(url: downloadedScenePath)
       let object = asset.object(at: 0)
       let node = SCNNode(mdlObject: object)
       //7. Add It To The Scene
       return node

    }
}