我如何转换下面的代码，让我扫描多个对象，每个对象都有不同的 .sks 文件？

Question

我正在创建一个增强现实应用程序，用于检测 space 中的 3D 对象并在其上方弹出一个标签。当前代码允许我检测多个对象，但只允许弹出一种类型的标签（.sks 文件）。我希望能够检测到多个对象，每个对象上面弹出不同的标签。

import UIKit
import SceneKit
import ARKit

class ViewController: UIViewController, ARSCNViewDelegate {

    @IBOutlet var sceneView: ARSCNView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Set the view's delegate
        sceneView.delegate = self

        // Show statistics such as fps and timing information
        sceneView.showsStatistics = true

        // Create a new scene
        let scene = SCNScene()

        // Set the scene to the view
        sceneView.scene = scene
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        // Create a session configuration
        let configuration = ARWorldTrackingConfiguration()

        // Object Detection
        configuration.detectionObjects = ARReferenceObject.referenceObjects(inGroupNamed: "FlowerObjects", bundle: Bundle.main)!

        // Run the view's session
        sceneView.session.run(configuration)
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)

        // Pause the view's session
        //sceneView.session.pause()
    }

    // MARK: - ARSCNViewDelegate

    func renderer(_ renderer: SCNSceneRenderer, nodeFor anchor: ARAnchor) -> SCNNode? {

        let node = SCNNode()

        if let objectAnchor = anchor as? ARObjectAnchor {
            let plane = SCNPlane(width: CGFloat(objectAnchor.referenceObject.extent.x * 1.0), height: CGFloat(objectAnchor.referenceObject.extent.y * 0.7))

            plane.cornerRadius = plane.width / 8

            let spriteKitScene = SKScene(fileNamed: "ProductInfo")

            plane.firstMaterial?.diffuse.contents = spriteKitScene
            plane.firstMaterial?.isDoubleSided = true
            plane.firstMaterial?.diffuse.contentsTransform = SCNMatrix4Translate(SCNMatrix4MakeScale(1, -1, 1), 0, 1, 0)

            let planeNode = SCNNode(geometry: plane)
            planeNode.position = SCNVector3Make(objectAnchor.referenceObject.center.x, objectAnchor.referenceObject.center.y + 0.5, objectAnchor.referenceObject.center.z) //y was 0.25

            node.addChildNode(planeNode)

        }

        return node
    }


    func session(_ session: ARSession, didFailWithError error: Error) {
        // Present an error message to the user

    }

    func sessionWasInterrupted(_ session: ARSession) {
        // Inform the user that the session has been interrupted, for example, by presenting an overlay

    }

    func sessionInterruptionEnded(_ session: ARSession) {
        // Reset tracking and/or remove existing anchors if consistent tracking is required

    }
}

Answer 1

一个 ARReferenceObject 有一个 name 类型的 String 变量，它很简单：

A descriptive name for the reference object.

当您将 ARReferenceObject 添加到 Assets.xcassetts 文件夹时，您可以选择设置名称（实际上会自动设置）：

因此，您可以使用此属性名称来处理根据检测到的 ARReferenceObject 显示的内容。就个人而言，我会使用以下委托回调来添加内容，尽管这取决于您：

func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor)

这样的工作示例可能如下所示：

//-------------------------
//MARK: - ARSCNViewDelegate
//-------------------------

extension ViewController: ARSCNViewDelegate{

  func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {

    /*
     Check To See Whether AN ARObject Anhcor Has Been Detected
     Get The The Associated ARReferenceObject
     Get The Name Of The ARReferenceObject
     */
    guard let objectAnchor = anchor as? ARObjectAnchor else { return }

    let detectedObject = objectAnchor.referenceObject
    guard let detectedObjectName = detectedObject.name else { return }

    //Get The Extent & Center Of The ARReferenceObject
    let detectedObjectExtent = detectedObject.extent
    let detectedObjecCenter = detectedObject.center

    //Log The Data
    print("""
      An ARReferenceObject Named \(detectedObjectName) Has Been Detected
      The Extent Of The Object Is \(detectedObjectExtent)
      The Center Of The Object Is \(detectedObjecCenter)
      """)

    //Create A Different Scene For Each Detected Object
    node.addChildNode(createSKSceneForReferenceObject(detectedObject: detectedObject))
  }

  /// Creates A Unique SKScene Based On A Detected ARReferenceObject
  ///
  /// - Parameter detectedObject: ARReferenceObject
  /// - Returns: SCNNode
  func createSKSceneForReferenceObject(detectedObject: ARReferenceObject) -> SCNNode{

    let plane = SCNPlane(width: CGFloat(detectedObject.extent.x * 1.0),
                         height: CGFloat(detectedObject.extent.y * 0.7))

    plane.cornerRadius = plane.width / 8

    guard let validName = detectedObject.name else { return SCNNode() }

    let spriteKitScene = SKScene(fileNamed: validName)

    plane.firstMaterial?.diffuse.contents = spriteKitScene
    plane.firstMaterial?.isDoubleSided = true
    plane.firstMaterial?.diffuse.contentsTransform = SCNMatrix4Translate(SCNMatrix4MakeScale(1, -1, 1), 0, 1, 0)

    let planeNode = SCNNode(geometry: plane)
    planeNode.position = SCNVector3Make(detectedObject.center.x, detectedObject.center.y + 0.5, detectedObject.center.z)

    return planeNode
  }
}

所有代码都有完整的注释，所以它应该是有意义的，你会注意到我创建了一个可重用的函数来生成不同的 SKScenes，当然可以修改它以添加不同的内容，例如SCNScene、SCNNodes 等

我正在使用 ARReferenceObject 的名称来加载同名场景，但您可以根据需要使用 if/else 或 switch 语句。

希望对您有所帮助... 希望它能为您指明正确的方向。

我如何转换下面的代码，让我扫描多个对象，每个对象都有不同的 .sks 文件？

How can I convert the code below to let me scan in multiple objects with different .sks files for each?

uikit

scenekit

swift

arkit