将世界原点自动设置到地板上的新点，并将一个3D模型与之连接。

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英文:

How do I automatically set the world origin to a new point on the floor and tether a 3D model there

问题

I want to do the followings automatically:

  • (1) 自动异步加载一个3D模型，例如高50厘米的花瓶。
  • (2) 检测地板上垂直于世界原点（设备的初始位置）的点P，并将P设置为新的世界原点。
  • (3) 在（2）中获取的点P处放置（1）中的3D模型。

因此，实际上，如果我侧身走开，我将看到一个花瓶站在我原来的位置上。

在我能执行（3）之前，我需要等待（1）和（2），并且我希望自动执行它们都让我感到困惑。

我应该如何解决这个问题？

我尝试使用以下代码生成一个AnchorEntity：

  1. let floorAnchorEntity = AnchorEntity(plane: [.horizontal],
  2.                         classification: [.floor],
  3.                         minimumBounds: [0.5, 0.5])
  4. floorAnchorEntity.name = "floor anchor entity"
  5. arView.scene.addAnchor(floorAnchorEntity)

然后，我尝试“同步”加载一个模型并将其连接到锚定实体：

  1. do {
  2.     let modelEntity = try Entity.load(named: modelName)
  3.     floorAnchorEntity.addChild(modelEntity)
  4. } catch {
  5.     assertionFailure("could not load assets.")
  6. }

我预期在地板上看到模型，但屏幕上没有看到任何内容。另外，锚定实体的“isActive”标志为“false”。

英文:

I want to do the followings automatically:

  • (1) asynchronously load a 3D model, for example a vase 50 cm tall
  • (2) detect the point P on the floor that is vertically down from the world origin (initial location of the device) and set P as the new world origin
  • (3) place the 3D model from (1) at P acquired in (2).

So, in effect, I'd see a vase standing at where I was if I were to step aside.

The fact that I need to wait on both (1) and (2) before I can perform (3), and that I want to perform all of them automatically got me really lost.

How should I approach this problem?

I tried to generate an AnchorEntity with the following:

  1. let floorAnchorEntity = AnchorEntity(plane: [.horizontal],
  2.                             classification: [.floor],
  3.                              minimumBounds: [0.5, 0.5])
  4. floorAnchorEntity.name = "floor anchor entity"
  5. arView.scene.addAnchor(floorAnchorEntity)

And load a model 'synchronously' and tether to the anchor entity:

  1. do {
  2.     let modelEntity = try Entity.load(named: modelName)
  3.     floorAnchorEntity.addChild(modelEntity)
  4. } catch {
  5.     assertionFailure("could not load assets.")
  6. }

I was expecting to see the model on the floor but I do not see any thing on the screen. Additionally, 'isActive' flag of the anchor entity is 'false'.

答案1

得分: 1

设置新的世界坐标原点

以下方法可以帮助您异步加载一个Reality Composer场景，提取一个模型，然后创建并跟踪一个水平面锚点（带有一个连接的模型），最后通过Combine的订阅者设置一个新的世界坐标原点。

然而，如果您的跟踪不准确，锚点的姿势和全新的世界坐标原点之间会存在一些差异。因此，在4秒后，我们会修正模型的变换。

  1. import RealityKit
  2. import UIKit
  3. import Combine
  5. class ViewController: UIViewController {
  6.     @IBOutlet var arView = ARView(frame: .zero)
  7.     var subs: [Cancellable] = []
  9.     override func viewDidLoad() {
  10.         super.viewDidLoad()
  11.         arView.debugOptions = [.showWorldOrigin]
  13.         Experience.loadBoxAsync { result in
  14.             switch result {
  15.                 case let .success(scene):
  16.                     guard let model = scene.steelBox else { return }
  18.                     let anchor = AnchorEntity(.plane(.horizontal,
  19.                                      classification: .floor,
  20.                                       minimumBounds: [0.5, 0.5]))
  21.                     anchor.addChild(model)
  23.                     var sub = arView.scene.subscribe(to: SceneEvents.DidAddEntity.self) { _ in
  24.                         self.arView.session.setWorldOrigin(relativeTransform:
  25.                                             model.transformMatrix(relativeTo: nil))
  26.                     }
  27.                     if subs.count == 0 { subs.append(sub) }
  28.                     arView.scene.anchors.append(anchor)
  30.                     DispatchQueue.main.asyncAfter(deadline: .now() + 4.0) {
  31.                         print(model.position(relativeTo: nil))  // 1
  32.                         model.setTransformMatrix(matrix_identity_float4x4, relativeTo: nil)
  33.                         print(model.position(relativeTo: nil))  // 2
  34.                     }
  35.                 case let .failure(error):
  36.                     print("由于 \(error) 的原因无法异步加载场景")
  37.             }
  38.         }
  39.     }
  40. }

第1次打印结果：SIMD3(-0.011, 0.018, -0.005)

第2次打印结果：SIMD3(0.0, 0.0, 0.0)

附注：

欲了解更多信息，请阅读此帖子。

英文:

Setting new World Origin

The following approach helps you asynchronously load a Reality Composer scene, extract a model, then create and track a horizontal plane anchor (with a tethered model), and finally set a new World Origin with the help of Combine's subscriber.

However, there will be some discrepancy between the pose of the anchor and the brand-new World Origin if your tracking is bad. So, after 4 seconds, we rectify model's transform.

  1. import RealityKit
  2. import UIKit
  3. import Combine
  5. class ViewController: UIViewController {        
  6.     @IBOutlet var arView = ARView(frame: .zero)
  7.     var subs: [Cancellable] = []
  8.     
  9.     override func viewDidLoad() {
  10.         super.viewDidLoad()            
  11.         arView.debugOptions = [.showWorldOrigin]
  13.         Experience.loadBoxAsync { result in
  14.             switch result {
  15.                 case let .success(scene):
  16.                     guard let model = scene.steelBox else { return }
  18.                     let anchor = AnchorEntity(.plane(.horizontal,
  19.                                      classification: .floor,
  20.                                       minimumBounds: [0.5, 0.5]))
  21.                     anchor.addChild(model)
  22.        
  23.                     var sub = arView.scene.subscribe(to: SceneEvents.DidAddEntity.self) { _ in
  24.                         self.arView.session.setWorldOrigin(relativeTransform: 
  25.                                             model.transformMatrix(relativeTo: nil))
  26.                     }
  27.                     if subs.count == 0 { subs.append(sub) }            
  28.                     arView.scene.anchors.append(anchor)
  29.         
  30.                     DispatchQueue.main.asyncAfter(deadline: .now() + 4.0) {
  31.                         print(model.position(relativeTo: nil))  // 1
  32.                         model.setTransformMatrix(matrix_identity_float4x4, relativeTo: nil) 
  33.                         print(model.position(relativeTo: nil))  // 2
  34.                     }
  35.                 case let .failure(error):
  36.                     print("Failed to asynchronously load scene due to \(error)")
  37.             }
  38.         }    
  39.     }
  40. }
  1. // 1st print result:       SIMD3<Float>(-0.011, 0.018, -0.005)
  3. // 2nd print result:       SIMD3<Float>(0.0, 0.0, 0.0)

P. S.

For more info, read this post.

huangapple
  • 本文由 发表于 2023年5月14日 01:13:05
  • 转载请务必保留本文链接：https://go.coder-hub.com/76244018.html
  • arkit
  • arview
  • augmented-reality
  • realitykit
  • swift
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