Question

当应用在ARKit中检测到至少一架飞机时，如何收到通知？

我目前正在做类似这样的事情，但它没有解雇/它没有关系：

extension MyViewController: ARSCNViewDelegate, ARSessionDelegate {
    internal func setupAR() {
        let scene = SCNScene()
        sceneView.scene = scene
        let configuration = ARWorldTrackingConfiguration()
        configuration.planeDetection = [.horizontal]
        sceneView.session.delegate = self
        sceneView.session.run(configuration)
    }

    public func session(_ session: ARSession, didUpdate anchors: [ARAnchor]) {
        if !anchors.isEmpty {
            print("ANCHORS NOT EMPTY")
            planesDetectedState()
        } else {
            print("Anchors is empty")
        }
    }
}

Answer 1

请先添加首先加入更新。您需要使用以下功能：

func session(_ session: ARSession, didAdd anchors: [ARAnchor]) {
        guard let frame = session.currentFrame else { return }
        print("Just added an anchor and felt so good")
}

另外，除非您向锚点添加节点，否则您将无法看到任何平面，您可以通过以下方式执行此操作：

func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
        // Add a planeNode and make it a child to the node automatically added.
}

我还建议，下载初学者代码，这些代码很容易理解为您正在考虑的事情。

https://developer.apple.com/documentation/arkit/building_your_first_ar_experience

Answer 2

如果您想检测ARAnchors，有几种方法可以解决这个问题。

1st：您可以使用ARSessionDelegate回拨：

public func session(_ session: ARSession, didAdd anchors: [ARAnchor]) { }

其中：

告诉代理人已经添加了一个或多个锚点会话。

使用此回调的示例如此：

extension UIViewController: ARSessionDelegate{

    public func session(_ session: ARSession, didAdd anchors: [ARAnchor]) {

        //1. If We Have At Least One ARAnchor Detected The Log The Information
        if !anchors.isEmpty {

            anchors.forEach { (anchor) in

                print("""
                      The Type Of Anchor = \(anchor.classForCoder)
                      The Anchor Identifier = \(anchor.identifier)
                      The Anchor Translation = X: \(anchor.transform.columns.3.x), Y: \(anchor.transform.columns.3.y), Z: \(anchor.transform.columns.3.z)
                      """)
            }
        }

    }
}

第二名：您可以使用ARSCNViewDelegate回调：

func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor)

其中：

告诉委托一个对应于新AR的SceneKit节点锚已被添加到场景中。

使用此回调的示例如此：

extension ViewController: ARSCNViewDelegate{

    func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {

        //1. Check An ARPlane Anchor Has Been Detected
        guard let planeAnchor = anchor as? ARPlaneAnchor else { return }

        //2. Get The Width & Height Of The Plane
        let width = CGFloat(planeAnchor.extent.x)
        let height = CGFloat(planeAnchor.extent.z)

        //3. Create An SCNPlane So We Can Visualize The Plane Detected
        let plane = SCNPlane(width: width, height: height)

        //4. Set It's Colour
        plane.materials.first?.diffuse.contents = UIColor.cyan

        //5. Create An SCNNode To Hold Our Plane
        let planeNode = SCNNode(geometry: plane)

        //6. Position & Rotate It
        let x = CGFloat(planeAnchor.center.x)
        let y = CGFloat(planeAnchor.center.y)
        let z = CGFloat(planeAnchor.center.z)
        planeNode.position = SCNVector3(x,y,z)
        planeNode.eulerAngles.x = -.pi / 2

        //7. Add It To The Node For Anchor
        node.addChildNode(planeNode)

    }

}

检测ARKit中的平面

2 个答案: