Ios RealityKit – ARView 光线投射返回 0 个结果

试试这段代码(我是为iPad的playground 编写的):

import RealityKit
import SwiftUI
import ARKit
import PlaygroundSupport

struct ContentView : View {
    
    @State private var arView = ARView(frame: .zero)
    
    var body: some View {
        return ARContainer(arView: $arView)
            .gesture(
                TapGesture()
                    .onEnded { _ in
                        raycasting(arView: arView)
                    }
            )
    }        
    func raycasting(arView: ARView) {
        guard let query = arView.makeRaycastQuery(from: arView.center, 
                                              allowing: .estimatedPlane, 
                                             alignment: .any)
        else { fatalError() }
            
        guard let result = arView.session.raycast(query).first
        else { fatalError() }
            
        let entity = ModelEntity(mesh: .generateSphere(radius: 0.1))
        let anchor = AnchorEntity(raycastResult: result)
        anchor.addChild(entity)
        arView.scene.anchors.append(anchor)
    }
}

struct ARContainer : UIViewRepresentable {
    
    @Binding var arView: ARView
    
    func makeUIView(context: Context) -> ARView {
        arView.cameraMode = .ar
        return arView
    }   
    func updateUIView(_ view: ARView, context: Context) { }
}

PlaygroundPage.current.needsIndefiniteExecution = true
PlaygroundPage.current.setLiveView(ContentView())

附注:

This version在UIKit应用程序中工作.