Get an URL from SCNScene

Question

In the apple example code for ARKit, they provided a VirtualObjectclass that load Scn files from Models.scnassets.

 static let availableObjects: [VirtualObject] = {
    let modelsURL = Bundle.main.url(forResource: "Models.scnassets", withExtension: nil)!

    let fileEnumerator = FileManager().enumerator(at: modelsURL, includingPropertiesForKeys: [])!

    return fileEnumerator.compactMap { element in
        let url = element as! URL

        guard url.pathExtension == "scn" && !url.path.contains("lighting") else { return nil }

        return VirtualObject(url: url)
    }
}()

Let's say I have a SCNScene that download from a sever, the first question is, this SCNScene is similar to scn files? if yes, how can I add this SCNScene to the above function, and get its URL to add it in the return VirtualObject(url: url) ? I stuck in this part for days, would be appreciated if anyone can help me.

Answer 1

You can store it in the file manager and get url from there

if scene is your SCNScene:

static let availableObjects: [VirtualObject] = {
    
    var virtualObjects: [VirtualObject] = []

    let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
    let url = paths.appendingPathComponent("chair.scn")
    
    scene.write(to: url, options: nil, delegate: nil) { float, error, pointer in
        if let error = error {
            print(error.localizedDescription)
            return
        }
    }
    
    if let objects = VirtualObject(url: url) {
        virtualObjects.append(objects)
    }
    return virtualObjects
}