将多个scn对象置于触摸中开始功能

Question

下面的我的快速代码使用func touchesBegan将scn对象放置在ARKit视图中。问题在于它仅放置对象一次。我想以某种方式创建代码，使用户可以选择任何区域来放置scn对象，并且它也可以根据需要多次放置它。

class ViewController: UIViewController, ARSCNViewDelegate {
@IBOutlet var sceneView: ARSCNView!
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

    //Handle the shooting
    guard let frame = sceneView.session.currentFrame else { return }
    let camMatrix = SCNMatrix4(frame.camera.transform)
    let direction = SCNVector3Make(-camMatrix.m31 * 5.0, -camMatrix.m32 * 10.0, -camMatrix.m33 * 5.0)
    let position = SCNVector3Make(camMatrix.m41, camMatrix.m42, camMatrix.m43)
    let scene = SCNScene(named: "art.scnassets/dontCare.scn")!


 sceneView.scene = scene


}

  }

Answer 1

您还需要找到用户在场景中点击的位置，即触摸的3D位置。这需要进行命中测试。

尝试一下

class ViewController: UIViewController, ARSCNViewDelegate {

@IBOutlet var sceneView: ARSCNView!

override func viewDidLoad() {
    super.viewDidLoad()
    sceneView.delegate = self
}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    let configuration = ARWorldTrackingConfiguration()
    sceneView.session.run(configuration)
}


override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    guard
        let touchPosition = touches.first?.location(in: sceneView),
        let hitTest = sceneView.hitTest(touchPosition, types: .featurePoint).first
        else {return}

    let sphere = SCNNode(geometry: SCNSphere(radius: 0.01))
    sphere.simdTransform = hitTest.worldTransform
    sceneView.scene.rootNode.addChildNode(sphere)
}

}