无法获取RealityKit中的相机位置。

huangapple
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英文:

Cannot get Camera position in RealityKit

问题

I am trying to load a 3D model "cube.usdz" onto the world position of the camera.

我正在尝试将一个3D模型 "cube.usdz" 加载到相机的世界位置上。

I've already looked at this solution: https://stackoverflow.com/a/45089244/13246089, but I have no idea how to implement it and where do I even call the function "session"? Sorry I am very new to this and don't know what I am doing.

我已经看过这个解决方案：https://stackoverflow.com/a/45089244/13246089，但我不知道如何实现它，甚至不知道在哪里调用 "session" 函数？对不起，我是新手，不知道我在做什么。

Why does my code always go to "why does nothing work"? Why can't I get the position of my camera? Any assistance or suggestions would be greatly appreciated.

为什么我的代码总是跳到 "为什么什么都不起作用"？为什么我不能获取相机的位置？任何帮助或建议将不胜感激。

import UIKit
import RealityKit
import ARKit

class Load3DModelViewController: UIViewController, ARSessionDelegate {

  1. @IBOutlet weak var arView: ARView!
  3. override func viewDidLoad() {
  4.     super.viewDidLoad()
  6.     // 设置AR配置
  7.     let configuration = ARWorldTrackingConfiguration()
  8.     configuration.planeDetection = .horizontal
  9.     arView.session.run(configuration)
  11.     load3DModel()
  12.     arView.session.delegate = self
  13. }
  15. func load3DModel() {
  16.     let modelFileName = "cube.usdz"
  18.     guard let modelEntity = try? Entity.load(named: modelFileName) else {
  19.         print("加载3D模型失败")
  20.         return
  21.     }
  23.     if let pos = arView.session.currentFrame?.camera.transform {
  24.         let xpos = pos.columns.3.x
  25.         let ypos = pos.columns.3.y
  26.         let zpos = pos.columns.3.z
  27.         let modelTranslation = SIMD3<Float>(xpos,ypos,zpos - 1)
  28.         modelEntity.setPosition(modelTranslation, relativeTo: nil)
  29.         arView.scene.addAnchor(modelEntity as! HasAnchoring)
  30.     } else {
  31.         print("\n为什么什么都不起作用\n")
  32.     }
  33. }

}

英文:

I am trying to load a 3d model "cube.usdz" onto the world position of the camera.

I've already looked at this solution: https://stackoverflow.com/a/45089244/13246089, but I have no idea how to implement it and where do I even call the function "session"? Sorry I am very new to this and don't know what I am doing.

Why does my code always go to "why does nothing work"? Why can't I get the position of my camera? Any assistance or suggestions would be greatly appreciated.

  1. import UIKit
  2. import RealityKit
  3. import ARKit
  5. class Load3DModelViewController: UIViewController, ARSessionDelegate {
  7.     @IBOutlet weak var arView: ARView!
  8.     
  9.     override func viewDidLoad() {
  10.         super.viewDidLoad()
  11.         
  12.         // set up AR configuration
  13.         let configuration = ARWorldTrackingConfiguration()
  14.         configuration.planeDetection = .horizontal
  15.         arView.session.run(configuration)
  16.         
  17.         load3DModel()
  18.         arView.session.delegate = self
  19.     }
  21.     func load3DModel() {
  22.         let modelFileName = &quot;cube.usdz&quot;
  24.         guard let modelEntity = try? Entity.load(named: modelFileName) else {
  25.             print(&quot;Failed to load the 3D model&quot;)
  26.             return
  27.         }
  28.         
  29.         if let pos = arView.session.currentFrame?.camera.transform {
  30.             let xpos = pos.columns.3.x
  31.             let ypos = pos.columns.3.y
  32.             let zpos = pos.columns.3.z
  33.             let modelTranslation = SIMD3&lt;Float&gt;(xpos,ypos,zpos - 1)
  34.             modelEntity.setPosition(modelTranslation, relativeTo: nil)
  35.             arView.scene.addAnchor(modelEntity as! HasAnchoring)
  36.         } else {
  37.             print(&quot;\nwhy does nothing work\n&quot;)
  38.         }
  39.     }
  40. }

答案1

得分: 1

始终跟随ARCamera的模型

第一个场景表示了RealityKit如何自动跟踪目标（即ARCamera的锚点），因此球体始终跟随ARCamera（沿Z轴偏移1米）。

  1. import UIKit
  2. import RealityKit
  4. class ViewController: UIViewController {
  5.     
  6.     @IBOutlet var arView: ARView!
  7.     
  8.     override func viewDidLoad() {
  9.         super.viewDidLoad()
  10.         
  11.         let sphere = ModelEntity(mesh: .generateSphere(radius: 0.05))
  12.         sphere.position.z = -1.0            
  14.         let cameraAnchor = AnchorEntity(.camera) 
  15.         cameraAnchor.addChild(sphere)
  16.         arView.scene.addAnchor(cameraAnchor)
  17.     }
  18. }

锚点复制ARCamera的变换信息在会话开始时

此示例显示了如何创建一个球体，该球体将被锚点位置捆绑，该位置是会话开始时相机位置的坐标加上2秒的延迟。

退后一步以查看球体。

  1. import UIKit
  2. import RealityKit
  4. class ViewController: UIViewController {
  5.     
  6.     @IBOutlet var arView: ARView!
  7.     
  8.     override func viewDidLoad() {
  9.         super.viewDidLoad()
  10.         
  11.         let sphere = ModelEntity(mesh: .generateSphere(radius: 0.05))
  13.         DispatchQueue.main.asyncAfter(deadline: .now() + 2.0) {
  15.             let worldAnchor = AnchorEntity() 
  16.             worldAnchor.transform = self.arView.cameraTransform
  18.             worldAnchor.addChild(sphere)
  19.             self.arView.scene.addAnchor(worldAnchor)
  20.         }
  21.     }
  22. }

更多信息可以在这里找到。

英文:

Model that always follows the ARCamera

The first scenario represents how RealityKit automatically tracks the target (i.e. ARCamera's anchor), so the sphere always follows the ARCamera (with 1 meter offset along Z axis).

  1. import UIKit
  2. import RealityKit
  4. class ViewController: UIViewController {
  5.     
  6.     @IBOutlet var arView: ARView!
  7.     
  8.     override func viewDidLoad() {
  9.         super.viewDidLoad()
  10.         
  11.         let sphere = ModelEntity(mesh: .generateSphere(radius: 0.05))
  12.         sphere.position.z = -1.0            
  14.         let cameraAnchor = AnchorEntity(.camera) 
  15.         cameraAnchor.addChild(sphere)
  16.         arView.scene.addAnchor(cameraAnchor)
  17.     }
  18. }

Anchor copying ARCamera's Transform when session started

This example shows how to create a sphere that will be tethered at the anchor's position with the coordinates of the camera location at the moment when session started + 2 seconds delay.

Take a step back to see the sphere.

  1. import UIKit
  2. import RealityKit
  4. class ViewController: UIViewController {
  5.     
  6.     @IBOutlet var arView: ARView!
  7.     
  8.     override func viewDidLoad() {
  9.         super.viewDidLoad()
  10.         
  11.         let sphere = ModelEntity(mesh: .generateSphere(radius: 0.05))
  13.         DispatchQueue.main.asyncAfter(deadline: .now() + 2.0) {
  15.             let worldAnchor = AnchorEntity() 
  16.             worldAnchor.transform = self.arView.cameraTransform
  18.             worldAnchor.addChild(sphere)
  19.             self.arView.scene.addAnchor(worldAnchor)
  20.         }
  21.     }
  22. }

More info you can find here.

huangapple
  • 本文由 发表于 2023年6月11日 21:41:29
  • 转载请务必保留本文链接：https://go.coder-hub.com/76450746.html
  • arkit
  • realitykit
  • swift
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