swift - 如何使用 ARKit 从远程服务器加载 usdz 模型和纹理?
问题描述
如何usdz
使用 ARKit 从远程服务器加载模型和纹理?
如下例所示:
let myURL = NSURL(string: "https://mywebsite.com/vase.scn")
guard let scene = try? SCNScene(url: myURL! as URL, options: nil) else {
return
}
let node = scene.rootNode.childNode(withName: "vase", recursively: true)
let transform = queryResult.worldTransform
let thirdColumn = transform.columns.3
node!.position = SCNVector3(thirdColumn.x, thirdColumn.y, thirdColumn.z)
self.sceneView.scene.rootNode.addChildNode(node!)
解决方案
我找到了如下解决方案:
下载模型并保存
func downloadModel() { guard let url = URL(url: originalURL) else { return } let urlSession = URLSession(configuration: .default, delegate: self, delegateQueue: OperationQueue()) let downloadTask = urlSession.downloadTask(with: url) downloadTask.resume() } extension ARViewController: URLSessionDownloadDelegate { public func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) { print("locationUrl:", location.path) // create destination URL with the original file name guard let url = downloadTask.originalRequest?.url else { return } let documentsPath = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)[0] let destinationURL = documentsPath.appendingPathComponent(url.lastPathComponent) // delete original copy try? FileManager.default.removeItem(at: destinationURL) // copy from temp to Document do { try FileManager.default.copyItem(at: location, to: destinationURL) self.originalURL = destinationURL print("originalURL:", originalURL!.path) } catch let error { print("Copy Error: \(error.localizedDescription)") } } }
加载 usdz 模型和纹理
func addItem(queryResult: ARRaycastResult) { let url = URL(string: originalURL!.path) let mdlAsset = MDLAsset(url: url!) mdlAsset.loadTextures() let scene = SCNScene(mdlAsset: mdlAsset) let node = scene.rootNode.childNode(withName: "model", recursively: true) let transform = queryResult.worldTransform let thirdColumn = transform.columns.3 node!.position = SCNVector3(thirdColumn.x, thirdColumn.y, thirdColumn.z) self.sceneView.scene.rootNode.addChildNode(node!) }
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