Adding multiple SCNNode(s) at the same time - swift

Question

I have this function named addShapes. I want it to create 3 shapes
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()
}
}
}
The problem is that it's only adding the first shape (ball1) and not all of them. Do you know why?
Thanks in advance!

Answer 1

Your code works fine (a position was a problem):
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()
}
}
}