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swiftaugmented-realityarkitface-detectionrealitykit

Error in displaying reality file from network


I am trying to display a reality file created using Reality Composer. The below code works for usdz but not for reality. Here is my code

struct ARViewContainer: UIViewRepresentable {
    
    var modelConfirmedForPlacement: AnchorEntity?
    
    func makeUIView(context: Context) -> ARView {
        
        let arView = ARView(frame: .zero,
                            cameraMode: .ar,automaticallyConfigureSession: true)
        
        let config = ARFaceTrackingConfiguration()
            
        arView.session.run(config)
        return arView            
    }
    
    func updateUIView(_ uiView: ARView, context: Context) {
        if let modelEntity = modelConfirmedForPlacement {
                      
           // Add the box anchor to the scene
            uiView.scene.anchors.append(modelEntity)   
        }
    }
}

//ViewModel

final class ContentViewModel: ObservableObject {
    
    @Published var modelConfirmedForPlacement: AnchorEntity?
    
    private var cancellable: AnyCancellable? = nil
    
    func updateModelEntity(path: String){
        let url = URL(fileURLWithPath: path)
        self.cancellable = AnchorEntity.loadAnchorAsync(contentsOf: url)
            .sink(receiveCompletion: { loadCompletion in
                if case let .failure(error) = loadCompletion {
                    print("Unable to load a model due to error \(error)")
                }
                self.cancellable?.cancel()
            }, receiveValue: { modelEntity in
                debugPrint("hereeeeeeeee")
                self.modelConfirmedForPlacement = modelEntity
            })
    }

func loadFileSync(url: URL, completion: @escaping (String?, Error?) -> Void)
    { 
//load from network and save locally }

The file does gets saved locally correctly but for reality files it is not displaying Here are the Xcode logs

File already exists [/var/mobile/Containers/Data/Application/880ED2EE-CCE7-4EE5-B854-0D1398650705/Documents/Experience.reality]
2021-07-25 16:29:09.060267+0530 RealityKitLoadModelFromNetwork[1352:474463] Metal GPU Frame Capture Enabled
2021-07-25 16:29:09.060478+0530 RealityKitLoadModelFromNetwork[1352:474463] Metal API Validation Enabled

Solution

  • Uploading a .reality model from web works fine. You can easily check this in Xcode Simulator:

    import UIKit
    import RealityKit
    
    class ViewController: UIViewController {
        
        @IBOutlet var arView: ARView!
        
        override func viewDidLoad() {
            super.viewDidLoad()
            
            let url = URL(string: "https://developer.apple.com/augmented-reality/quick-look/models/cosmonaut/CosmonautSuit_en.reality")
            let documents = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
            let destination = documents.appendingPathComponent(url!.lastPathComponent)
            let session = URLSession(configuration: .default,
                                          delegate: nil,
                                     delegateQueue: nil)
            
            var request = URLRequest(url: url!)
            request.httpMethod = "GET"
            
            let downloadTask = session.downloadTask(with: request, completionHandler: { (location: URL?,
                                      response: URLResponse?,
                                         error: Error?) -> Void in
                
                let fileManager = FileManager.default
                    
                if fileManager.fileExists(atPath: destination.path) {
                    try! fileManager.removeItem(atPath: destination.path)
                }
                try! fileManager.moveItem(atPath: location!.path,
                                          toPath: destination.path)
                    
                DispatchQueue.main.async {
                    do {
                        let model = try Entity.loadAnchor(contentsOf: destination)
                        self.arView.scene.addAnchor(model)
                    } catch {
                        print("Fail loading entity.")
                    }
                }
            })
            downloadTask.resume()
        }
    }