同时添加多个 SCNNode(s)

Posted 2023-03-23

【中文标题】同时添加多个 SCNNode(s)

【英文标题】：Adding multiple SCNNode(s) at the same time

【发布时间】：2021-08-10 05:36:57

【问题描述】：

我有一个名为addShapes 的函数。我希望它创建 3 个形状

import ARKit
import SwiftUI
struct SceneKitView: UIViewRepresentable 
    
    let arView = ARSCNView(frame: .zero)
    let config = ARWorldTrackingConfiguration()
    @Binding var addBox: Int
    @Binding var reset: Bool
    @Binding var node: SCNNode
    
    fileprivate func addShapes() 
        let letBall1Geo = SCNSphere(radius: 0.05)
        letBall1Geo.firstMaterial?.diffuse.contents = UIColor.red
        letBall1Geo.firstMaterial?.specular.contents = UIColor.white
        let ball1 = SCNNode(geometry: letBall1Geo)
        ball1.position = SCNVector3(0, 0, 0)
        self.arView.scene.rootNode.addChildNode(ball1)
                
        let letBall2Geo = SCNSphere(radius: 0.05)
        letBall2Geo.firstMaterial?.diffuse.contents = UIColor.white
        letBall2Geo.firstMaterial?.specular.contents = UIColor.white
        let ball2 = SCNNode(geometry: letBall2Geo)
        ball1.position = SCNVector3(1, 1, 1)
        self.arView.scene.rootNode.addChildNode(ball2)
        
        let stickGeo = SCNCapsule(capRadius: 0.05, height: 0.1)
        stickGeo.firstMaterial?.diffuse.contents = UIColor.blue
        stickGeo.firstMaterial?.specular.contents = UIColor.white
        let stick = SCNNode(geometry: stickGeo)
        stick.position = SCNVector3(2, 2, 2)
        self.arView.scene.rootNode.addChildNode(stick)
        
    
    
    fileprivate func removeCube() 
        /////
    
    
    func makeUIView(context: Context) -> ARSCNView 
        arView.scene = SCNScene()
        arView.autoenablesDefaultLighting = true
        arView.debugOptions = [ARSCNDebugOptions.showFeaturePoints, ARSCNDebugOptions.showWorldOrigin]
        arView.session.run(self.config)
        return arView
    
    
    func updateUIView(_ uiView: ARSCNView,
                       context: Context) 
        if addBox > 0 
            self.addShapes()
        
        if reset 
            self.removeCube()
        
    

问题在于它只添加了第一个形状 (ball1) 而不是全部。你知道为什么吗？ 提前致谢！

【参考方案1】：

您的代码运行良好（位置是个问题）：

import SwiftUI
import ARKit

struct ContentView : View 
    
    @State var addBox: Int = 3
    @State var reset: Bool = false
    @State var node: SCNNode = SCNNode()
    
    var body: some View 
        return SceneKitView(addBox: $addBox,
                             reset: $reset,
                              node: $node).edgesIgnoringSafeArea(.all)
    


struct SceneKitView: UIViewRepresentable 
    
    let arView = ARSCNView(frame: .zero)
    let config = ARWorldTrackingConfiguration()
    @Binding var addBox: Int
    @Binding var reset: Bool
    @Binding var node: SCNNode
    
    fileprivate func addShapes() 
        let letBall1Geo = SCNSphere(radius: 0.05)
        letBall1Geo.firstMaterial?.diffuse.contents = UIColor.red
        letBall1Geo.firstMaterial?.specular.contents = UIColor.white
        let ball1 = SCNNode(geometry: letBall1Geo)
        ball1.position = SCNVector3(0, 0, -1)
        self.arView.scene.rootNode.addChildNode(ball1)
                
        let letBall2Geo = SCNSphere(radius: 0.05)
        letBall2Geo.firstMaterial?.diffuse.contents = UIColor.green
        letBall2Geo.firstMaterial?.specular.contents = UIColor.white
        let ball2 = SCNNode(geometry: letBall2Geo)
        ball1.position = SCNVector3(0, 0.2, -1)
        self.arView.scene.rootNode.addChildNode(ball2)
        
        let stickGeo = SCNCapsule(capRadius: 0.05, height: 0.1)
        stickGeo.firstMaterial?.diffuse.contents = UIColor.blue
        stickGeo.firstMaterial?.specular.contents = UIColor.white
        let stick = SCNNode(geometry: stickGeo)
        stick.position = SCNVector3(0, 0.4, -1)
        self.arView.scene.rootNode.addChildNode(stick)            
    

    func makeUIView(context: Context) -> ARSCNView 
        arView.scene = SCNScene()
        arView.autoenablesDefaultLighting = true
        arView.debugOptions = [.showFeaturePoints, .showWorldOrigin]
        arView.session.run(self.config)
        return arView
    
    
    func updateUIView(_ uiView: ARSCNView, context: Context) 
        if addBox > 0 
            self.addShapes()
        
    

【讨论】：

感谢您的帮助！