Swift 错误 – 尝试将父节点添加为子节点

Question

我正在努力尝试获取我拥有的.dae文件，并在识别出照片中的第一个图像文件后显示它。不幸的是，我收到一个错误，指出父节点被添加为子节点，并且不了解发生这种情况的位置。

有什么想法吗？

import UIKit
import SceneKit
import ARKit
class PlaneTrackingViewController: UIViewController, ARSCNViewDelegate {
@IBOutlet weak var ARPlaneView: ARSCNView!
override func viewDidLoad() {
super.viewDidLoad()
ARPlaneView.delegate = self
let scene = SCNScene(named: "Art.scnassets/LoadScene.scn")!
ARPlaneView.scene = scene
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let configuration = ARImageTrackingConfiguration()
guard let trackedImages = ARReferenceImage.referenceImages(inGroupNamed: "Photos", bundle: Bundle.main) else {print ("No Images Available")
return
}
configuration.trackingImages = trackedImages
configuration.maximumNumberOfTrackedImages = 1
ARPlaneView.session.run(configuration)
}
override func viewWillDisappear(_ animated: Bool) {
ARPlaneView.session.pause()
}
func renderer(_ renderer:SCNSceneRenderer, nodeFor anchor: ARAnchor) -> SCNNode? {
let node = SCNNode()
if let imageAnchor = anchor as? ARImageAnchor {
let plane = SCNPlane(width: imageAnchor.referenceImage.physicalSize.width, height: imageAnchor.referenceImage.physicalSize.height)
plane.firstMaterial?.diffuse.contents = UIColor(white: 1, alpha: 0.6)
let planeNode = SCNNode(geometry: plane)
planeNode.eulerAngles.x = -.pi / 2
let motorScene = SCNScene(named: "Art.scnassets/ACMotor/ACMotor.dae")!
let motorNode = motorScene.rootNode.childNodes.first!
motorNode.position = SCNVector3Zero
motorNode.position.z = 0.3
motorNode.addChildNode(motorNode)
node.addChildNode(planeNode)
}           
return node
}
}

Answer 1

应该这样写：scene.rootNode.addChildNode(node)

或者在您的情况下：

motorScene.rootNode.addChildNode(motorNode)

Answer 2

此行

motorNode.addChildNode(motorNode)

告诉我您正在尝试将motorNode添加到motorNode中，这显然是这里的错误 - 您正在将节点添加到自身中。