ARFrame 锚点中不存在 AREnvironmentProbeAnchor

Posted 2023-03-23

【中文标题】ARFrame 锚点中不存在 AREnvironmentProbeAnchor

【英文标题】：AREnvironmentProbeAnchor are not present in ARFrame anchors

【发布时间】：2019-08-27 15:47:51

【问题描述】：

当模式为automatic 时，我无法弄清楚AREnvironmentProbeAnchor 的工作原理。我假设 ARKit 为我创建了一系列带有纹理的锚点，但我看不到它们。

我添加到配置中：

session.configuration.environmentTexturing = AREnvironmentTexturingAutomatic;

现在我正在遍历框架中的所有锚点并寻找AREnvironmentProbeAnchor：

for (ARAnchor* anchor in frame.anchors) 
    if ([anchor isKindOfClass:[AREnvironmentProbeAnchor class]]) 
        NSLog(@"found");
    

可能出了什么问题？

谢谢！

【问题讨论】：

你从哪里循环锚点？

【参考方案1】：

例如，您应该在实例方法renderer(_:didAdd:for:) 中使用if-statement。任何 ARAnchor 都必须属于 SCNNode。试试这段代码，看看它是如何工作的（抱歉，它是在 Swift 中而不是在 Objective-C 中）：

import UIKit
import SceneKit
import ARKit

class ViewController: UIViewController, ARSCNViewDelegate 

    @IBOutlet var sceneView: ARSCNView!

    override func viewDidLoad() 
        super.viewDidLoad()
        sceneView.delegate = self
        let scene = SCNScene(named: "art.scnassets/yourScene.scn")!

        let sphereNode = SCNNode(geometry: SCNSphere(radius: 0.05))
        sphereNode.position = SCNVector3(x: 0, y: -0.5, z: -1)
        let reflectiveMaterial = SCNMaterial()
        reflectiveMaterial.lightingModel = .physicallyBased
        reflectiveMaterial.metalness.contents = 1.0
        reflectiveMaterial.roughness.contents = 0
        sphereNode.geometry?.firstMaterial = reflectiveMaterial

        let moveLeft = SCNAction.moveBy(x: 0.25, y: 0, z: 0.25, duration: 2)
        moveLeft.timingMode = .easeInEaseOut;
        let moveRight = SCNAction.moveBy(x: -0.25, y: 0, z: -0.25, duration: 2)
        moveRight.timingMode = .easeInEaseOut;
        let moveSequence = SCNAction.sequence([moveLeft, moveRight])
        let moveLoop = SCNAction.repeatForever(moveSequence)
        sphereNode.runAction(moveLoop)

        sceneView.scene = scene
        sceneView.scene.rootNode.addChildNode(sphereNode)
    
    override func viewWillAppear(_ animated: Bool) 
        super.viewWillAppear(animated)
        let configuration = ARWorldTrackingConfiguration()
        configuration.environmentTexturing = .automatic
        sceneView.session.run(configuration)
    
    override func viewWillDisappear(_ animated: Bool) 
        super.viewWillDisappear(animated)
        sceneView.session.pause()
    
    func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) 
        guard anchor is AREnvironmentProbeAnchor else 
            print("Environment anchor is NOT FOUND")
            return
        
        print("It's", anchor.isKind(of: AREnvironmentProbeAnchor.self))
    

结果：

// It's true

希望这会有所帮助。