在 Scenekit 视图中从网络加载 3d usdz 模型不起作用? [英] Load 3d usdz model from network in Scenekit view does not work?

问题描述

我正在尝试在我的场景工具包视图中从网络加载一个 3d 使用过的模型.模型被正确下载并保存在文件中，但不会显示在场景套件视图中.这是我的代码.我没有收到任何错误.不知道到底是什么问题

I am trying to load a 3d used model from network in my Scene kit view. The model gets downloaded properly and is saved in file but is not displayed in scene kit view. Here is my code. I am not getting any error. Not sure what exactly is the issue

import UIKit
import SceneKit

class ViewController: UIViewController,URLSessionDownloadDelegate {
    
    @IBOutlet weak var scnView: SCNView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        downloadSceneTask()
    }
    
    
    func downloadSceneTask(){
        
        //1. Get The URL Of The SCN File
        guard let url = URL(string: "url_to_load_3d_model") 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()
    }
    
    func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
        
        //1. Create The Filename
        let fileURL = getDocumentsDirectory().appendingPathComponent("nike.usdz")
        
        //2. Copy It To The Documents Directory
        do {
            try FileManager.default.copyItem(at: location, to: fileURL)
            
            print("Successfuly Saved File \(fileURL)")
            
            //3. Load The Model
            loadModel()
            
        } catch {
            
            print("Error Saving: \(error)")
            loadModel()
        }
        
    }
    
    func getDocumentsDirectory() -> URL {
        
        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        let documentsDirectory = paths[0]
        return documentsDirectory
        
    }
    
    func loadModel(){
        
        //1. Get The Path Of The Downloaded File
        let downloadedScenePath = getDocumentsDirectory().appendingPathComponent("nike.usdz")
        
        do {
            
            //2. Load The Scene Remembering The Init Takes ONLY A Local URL
            let modelScene =  try SCNScene(url: downloadedScenePath, options: nil)
            
            //3. Create A Node To Hold All The Content
            let modelHolderNode = SCNNode()
            
            //4. Get All The Nodes From The SCNFile
            let nodeArray = modelScene.rootNode.childNodes
            
            //5. Add Them To The Holder Node
            for childNode in nodeArray {
                modelHolderNode.addChildNode(childNode as SCNNode)
            }
            
            //6. Set The Position
            modelHolderNode.position = SCNVector3(0, 0, 0)
            
            //7. Add It To The Scene
            self.scnView.scene?.rootNode.addChildNode(modelHolderNode)
            
            
        } catch  {
            print("Error Loading Scene")
        }
        
    }
    
    
    
}

推荐答案

我以这种方式加载了模型并且它对我有用:

I loaded the model this way and it worked for me:

import SceneKit.ModelIO

func loadModel(){
    
    //1. Get The Path Of The Downloaded File
    let downloadedScenePath = getDocumentsDirectory().appendingPathComponent("nike.usdz")
    
    self.scnView.autoenablesDefaultLighting=true
    self.scnView.showsStatistics=true
    self.scnView.backgroundColor = UIColor.blue
    let asset = MDLAsset(url: downloadedScenePath)
    asset.loadTextures()
    let scene = SCNScene(mdlAsset: asset)
    self.scnView.scene=scene
    self.scnView.allowsCameraControl=true
}

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