[SOLVED] Get an URL from SCNScene

Get an URL from SCNScene

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.

Solution

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
}