RealityKit – ARView射线投射返回0结果

huangapple
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英文:

RealityKit – ARView raycasting returns 0 results

问题

我有一个RealityKit的ARView子类，具有以下用于进行射线投射的函数：

  1. func makeRaycastQuery(alignmentType: ARRaycastQuery.TargetAlignment) -> simd_float4x4? {
  2.     let results = self.raycast(from: self.center,
  3.                         // Better for pinning to planes
  4.                         allowing: .estimatedPlane,
  5.                         alignment: alignmentType)
  7.     // 我们不关心射线投射时的缩放，所以保持它不变
  8.     guard var result = results.first?.worldTransform else { return nil }
  9.     result.scale = SCNVector3(1, 1, 1)
  10.     return result
  11. }

然而，我的results数组始终为空。在设置ARView以启用射线投射时，是否需要进行其他配置？

英文:

I have a subclass of RealityKit's ARView that has the following function for making a Raycast:

  1. func makeRaycastQuery(alignmentType: ARRaycastQuery.TargetAlignment) -> simd_float4x4? {
  2.     let results = self.raycast(from: self.center,
  3.                            // Better for pinning to planes
  4.                            allowing: .estimatedPlane,
  5.                           alignment: alignmentType)
  7.     // We don't care about changing scale on raycast so keep it the same
  8.     guard var result = results.first?.worldTransform else { return nil }
  9.     result.scale = SCNVector3(1, 1, 1)
  10.     return result
  11. }

However, my results array is always empty. Is there some sort of other configuration I need to do when setting up an ARView to enable raycasting?

答案1

得分: 1

以下是代码的中文翻译部分：

  1. 尝试使用此代码（我为iPad的Playgrounds编写了它）：
  3.     import RealityKit
  4.     import SwiftUI
  5.     import ARKit
  6.     import PlaygroundSupport
  7.     
  8.     struct ContentView : View {
  9.         
  10.         @State private var arView = ARView(frame: .zero)
  11.         
  12.         var body: some View {
  13.             return ARContainer(arView: $arView)
  14.                 .gesture(
  15.                     TapGesture()
  16.                         .onEnded { _ in
  17.                             raycasting(arView: arView)
  18.                         }
  19.                 )
  20.         }        
  21.         func raycasting(arView: ARView) {
  22.             guard let query = arView.makeRaycastQuery(from: arView.center, 
  23.                                                   allowing: .estimatedPlane, 
  24.                                                  alignment: .any)
  25.             else { fatalError() }
  26.                 
  27.             guard let result = arView.session.raycast(query).first
  28.             else { fatalError() }
  29.                 
  30.             let entity = ModelEntity(mesh: .generateSphere(radius: 0.1))
  31.             let anchor = AnchorEntity(raycastResult: result)
  32.             anchor.addChild(entity)
  33.             arView.scene.anchors.append(anchor)
  34.         }
  35.     }
  37.     struct ARContainer : UIViewRepresentable {
  38.         
  39.         @Binding var arView: ARView
  40.         
  41.         func makeUIView(context: Context) -> ARView {
  42.             arView.cameraMode = .ar
  43.             return arView
  44.         }   
  45.         func updateUIView(_ view: ARView, context: Context) { }
  46.     }
  48.     PlaygroundPage.current.needsIndefiniteExecution = true
  49.     PlaygroundPage.current.setLiveView(ContentView())
  51. P. S. 
  53. [此版本][1] 在UIKit应用程序中有效。
  55.   [1]: https://stackoverflow.com/questions/72232024/realitykit-why-anchorentity-position-is-always-x-0-y-0-z-0/72232793#72232793

希望这对您有所帮助。如果您需要进一步的协助，请随时提出。

英文:

Try this code (I've written it for iPad's Playgrounds):

  1. import RealityKit
  2. import SwiftUI
  3. import ARKit
  4. import PlaygroundSupport
  6. struct ContentView : View {
  7.     
  8.     @State private var arView = ARView(frame: .zero)
  9.     
  10.     var body: some View {
  11.         return ARContainer(arView: $arView)
  12.             .gesture(
  13.                 TapGesture()
  14.                     .onEnded { _ in
  15.                         raycasting(arView: arView)
  16.                     }
  17.             )
  18.     }        
  19.     func raycasting(arView: ARView) {
  20.         guard let query = arView.makeRaycastQuery(from: arView.center, 
  21.                                               allowing: .estimatedPlane, 
  22.                                              alignment: .any)
  23.         else { fatalError() }
  24.             
  25.         guard let result = arView.session.raycast(query).first
  26.         else { fatalError() }
  27.             
  28.         let entity = ModelEntity(mesh: .generateSphere(radius: 0.1))
  29.         let anchor = AnchorEntity(raycastResult: result)
  30.         anchor.addChild(entity)
  31.         arView.scene.anchors.append(anchor)
  32.     }
  33. }
  1. struct ARContainer : UIViewRepresentable {
  2.     
  3.     @Binding var arView: ARView
  4.     
  5.     func makeUIView(context: Context) -> ARView {
  6.         arView.cameraMode = .ar
  7.         return arView
  8.     }   
  9.     func updateUIView(_ view: ARView, context: Context) { }
  10. }
  1. PlaygroundPage.current.needsIndefiniteExecution = true
  2. PlaygroundPage.current.setLiveView(ContentView())

P. S.

This version works in UIKit app.

huangapple
  • 本文由 发表于 2023年2月10日 11:16:00
  • 转载请务必保留本文链接：https://go.coder-hub.com/75406595.html
  • arkit
  • ios
  • realitykit
  • swift
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