在 iOS ARKit 应用程序中，我一直在尝试将ARFaceGeometry数据保存到 OBJ 文件中。我按照这里的解释：How to make a 3D model from AVDepthData? . 但是，未正确创建 OBJ。这是我所拥有的：
func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
guard let faceAnchor = anchor as? ARFaceAnchor else { return }
currentFaceAnchor = faceAnchor
// If this is the first time with this anchor, get the controller to create content.
// Otherwise (switching content), will change content when setting `selectedVirtualContent`.
if node.childNodes.isEmpty, let contentNode = selectedContentController.renderer(renderer, nodeFor: faceAnchor) {
node.addChildNode(contentNode) …