Ios 阿基特公司；Reality composer-如何使用图像坐标锚定场景

我已经编写了代码来初始化3个Reality Composer场景中的一个场景，根据一个月的哪一天按下按钮

一切正常

Reality Composer场景使用图像检测将对象放置在环境中，但当前，一旦图像脱离摄影机视图，对象就会消失

我想锚定场景，根节点是第一次检测到图像的位置，这样用户可以查看场景周围的情况，并且即使图像触发器不在摄影机视图中，对象也会保持不变

我尝试在下面传入func渲染器代码，但出现错误，表示视图控制器类没有.planeNode

 func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
            guard let imageAnchor = anchor as? ARImageAnchor else { return }
            let referenceImage = imageAnchor.referenceImage

                // Create a plane to visualize the initial position of the detected image.
                let plane = SCNPlane(width: referenceImage.physicalSize.width,
                                 height: referenceImage.physicalSize.height)
                plane.materials.first?.diffuse.contents = UIColor.blue.withAlphaComponent(0.20)
                self.planeNode = SCNNode(geometry: plane)

                self.planeNode?.opacity = 1

                /*
                 `SCNPlane` is vertically oriented in its local coordinate space, but
                 `ARImageAnchor` assumes the image is horizontal in its local space, so
                 rotate the plane to match.
                 */
                self.planeNode?.eulerAngles.x = -.pi / 2

                /*
                 Image anchors are not tracked after initial detection, so create an
                 animation that limits the duration for which the plane visualization appears.
                 */

                // Add the plane visualization to the scene.
                if let planeNode = self.planeNode {
                    node.addChildNode(planeNode)
                }

                if let imageName = referenceImage.name {
                    plane.materials = [SCNMaterial()]
                    plane.materials[0].diffuse.contents = UIImage(named: imageName)
                }

这是我的密码

import UIKit
import RealityKit
import ARKit
import SceneKit



class ViewController: UIViewController {



@IBOutlet var move: ARView!
    @IBOutlet var arView: ARView!

    var ARBorealAnchor3: ARboreal.ArBoreal3!

    var ARBorealAnchor2: ARboreal.ArBoreal2!

    var ARBorealAnchor: ARboreal.ArBoreal!

    var Date1 = 1




    override func viewDidLoad() {
        super.viewDidLoad()



        func getSingle() {
            let date = Date()
            let calendar = Calendar.current
            let day = calendar.component(.day, from: date)
            Date1 = day
        }

     getSingle()

      ARBorealAnchor = try! ARboreal.loadArBoreal()

        ARBorealAnchor2 = try!
        ARboreal.loadArBoreal2()

        ARBorealAnchor3 = try!
              ARboreal.loadArBoreal3()



        if Date1 == 24 {
            arView.scene.anchors.append(ARBorealAnchor)
        }
        if Date1 == 25 {
            arView.scene.anchors.append(ARBorealAnchor2)
        }
        if Date1 == 26 {
            arView.scene.anchors.append(ARBorealAnchor3)
        }
    }
}

任何帮助都将不胜感激

干杯，

---

丹尼尔·萨维奇（Daniel Savage）

正在发生的事情是，当图像锚离开视图时，锚实体将变得不受约束，并且它将停止渲染它及其所有后代

解决此问题的一种方法是，只需分离图像锚定和要渲染的内容，在代码中手动添加图像锚定，然后在首次检测到图像锚定时，将内容添加到另一个世界锚定下的场景中。更新图像定位变换后，更新世界定位以匹配

这样，当图像定位点可见以获取最新的变换时，可以使用图像定位点，但当图像定位点消失时，内容的呈现与图像定位点无关。如下所示（您必须创建一个名为ARTest的AR资源组，并向其中添加一个名为“test”的图像，以使锚正常工作）：

注意：ARKit试图计算精确的图像平面时，ARImageAnchor的变换似乎会随着您的移动而频繁更新（例如，内容可能看起来位于正确的位置，但z值不准确），确保AR资源组中的图像尺寸准确，以便更好地跟踪图像

import ARKit
import SwiftUI
import RealityKit
import Combine

struct ContentView : View {
    var body: some View {
        return ARViewContainer().edgesIgnoringSafeArea(.all)
    }
}

let arDelegate = SessionDelegate()

struct ARViewContainer: UIViewRepresentable {

  func makeUIView(context: Context) -> ARView {

    let arView = ARView(frame: .zero)

    arDelegate.set(arView: arView)
    arView.session.delegate = arDelegate

    // Create an image anchor, add it to the scene. We won't add any
    // rendering content to the anchor, it will be used only for detection
    let imageAnchor = AnchorEntity(.image(group: "ARTest", name: "test"))
    arView.scene.anchors.append(imageAnchor)

    return arView
  }

  func updateUIView(_ uiView: ARView, context: Context) {}
}

final class SessionDelegate: NSObject, ARSessionDelegate {
  var arView: ARView!
  var rootAnchor: AnchorEntity?

  func set(arView: ARView) {
    self.arView = arView
  }

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

    // If we already added the content to render, ignore
    if rootAnchor != nil {
       return
    }

    // Make sure we are adding to an image anchor. Assuming only
    // one image anchor in the scene for brevity.
    guard anchors[0] is ARImageAnchor else {
      return
    }

    // Create the entity to render, could load from your experience file here
    // this will render at the center of the matched image
    rootAnchor = AnchorEntity(world: [0,0,0])
    let ball = ModelEntity(
      mesh: MeshResource.generateBox(size: 0.01),
      materials: [SimpleMaterial(color: .red, isMetallic: false)]
    )
    rootAnchor!.addChild(ball)

    // Just add another model to show how it remains in the scene even
    // when the tracking image is out of view.
    let ball2 = ModelEntity(
      mesh: MeshResource.generateBox(size: 0.10),
      materials: [SimpleMaterial(color: .orange, isMetallic: false)]
    )
    ball.addChild(ball2)
    ball2.position = [0, 0, 1]

    arView.scene.addAnchor(rootAnchor!)
  }

  func session(_ session: ARSession, didUpdate anchors: [ARAnchor]) {
    guard let rootAnchor = rootAnchor else {
      return
    }

    // Code is assuming you only have one image anchor for brevity
    guard let imageAnchor = anchors[0] as? ARImageAnchor else {
      return
    }

    if !imageAnchor.isTracked {
      return
    }

    // Update our fixed anchor to image transform
    rootAnchor.transform = Transform(matrix: imageAnchor.transform)
  }

}

#if DEBUG
struct ContentView_Previews : PreviewProvider {
  static var previews: some View {
    ContentView()
  }
}
#endif