在 ARView 中放置对象时，ARKit RealityKit 会在运行时发出警告
Myo*_*ung 7 ios swift arkit realitykit
当我点击在 ARView 中加载模型时，我在运行时收到以下警告：警告（辅助线程）：在 sdf/path.cpp 的第 859 行的 AppendProperty -- Can only append a property 'preliminary:anchoring:type' to a主要路径 (/) 警告（辅助线程）：在 sdf/path.cpp 的第 859 行的 AppendProperty 中 -- 只能将属性“触发器”附加到主要路径 (/)
任何人都知道为什么我会收到此警告？所有的逻辑都在我的 ViewController 中：
import UIKit
import ARKit
import RealityKit
import SwiftUI
import Combine
class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {
private var modelArray: [String] = []
var selectedModel = ""
@IBOutlet weak var arView: ARView!
@IBOutlet weak var modelCollectionView: UICollectionView!
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
loadModelName()
arView.session.delegate = self
setupARView()
//modelArray = getModelNames()
self.modelCollectionView.dataSource = self
self.modelCollectionView.delegate = self
arView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleTap(recognizer:))))
}
// Dynamically load available files from directory
func loadModelName() {
let fm = FileManager.default
let path = Bundle.main.resourcePath!
do {
let items = try fm.contentsOfDirectory(atPath: path)
for item in items where item.hasSuffix("usdz"){
let modelName = item.replacingOccurrences(of: ".usdz", with: "")
print("Found \(item)")
modelArray.append(modelName)
}
} catch {
// failed to read directory – bad permissions, perhaps?
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return modelArray.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "item", for: indexPath) as! itemCell
cell.itemImage.image = UIImage(named: self.modelArray[indexPath.row])
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath)
cell?.backgroundColor = UIColor.lightGray
selectedModel = self.modelArray[indexPath.row] + ".usdz"
}
func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath)
cell?.backgroundColor = UIColor.white
}
func setupARView() {
arView.automaticallyConfigureSession = false
let configuration = ARWorldTrackingConfiguration()
configuration.planeDetection = [.horizontal, .vertical]
configuration.environmentTexturing = .automatic
if ARWorldTrackingConfiguration.supportsSceneReconstruction(.mesh) {
print("scene reconstruction supported")
configuration.sceneReconstruction = .mesh
configuration.sceneReconstruction = .meshWithClassification
arView.debugOptions.insert(.showSceneUnderstanding)
}
arView.session.run(configuration)
print("plane detection")
}
@objc
func handleTap(recognizer: UITapGestureRecognizer) {
//gets the location in the arView
let location = recognizer.location(in: arView)
//grab the results of the tap -location: the location of the tap -allowing: tye type of surface to calculate the location -alignment: the type of surface
let reults = arView.raycast(from: location, allowing: .estimatedPlane, alignment: .any)
//check to see if the raycast returned a result, did it actually hit a horizontal surface
if let firstResult = reults.first {
//returns an array of all the things it finds so grab the first
//in order to add objects into a scene, we have to add objects to anchors, firstResult.worldTransform - add anchor at the orientation and position
print("tap gesture recognized")
print("DEBUG: the model is \(selectedModel)")
let anchor = ARAnchor(name: selectedModel, transform: firstResult.worldTransform)
arView.session.add(anchor: anchor)
} else {
print("object placement failed, couldn't find surface")
}
}
func placeObject(named entityName: String, for anchor: ARAnchor) {
let entity = try! ModelEntity.loadModel(named: entityName)
//add collision to have physiscs for manipulations
entity.generateCollisionShapes(recursive: true)
arView.installGestures([.rotation, .translation], for: entity)
//create an anchor entity
let anchorEntity = AnchorEntity(anchor: anchor)
// add the entity to anchor
anchorEntity.addChild(entity.clone(recursive: true))
//add the anchor with the entity to the scene
arView.scene.addAnchor(anchorEntity)
}
}
extension ViewController: ARSessionDelegate {
func session(_ session: ARSession, didAdd anchors: [ARAnchor]) {
for anchor in anchors {
if let anchorName = anchor.name, anchorName == selectedModel {
placeObject(named: anchorName, for: anchor)
}
}
}
}
关于警告
\n我简单说一下，答案听起来是这样的：如果你为 USDZ 模型设置了初步锚定，那么 Xcode 将不会打印此类警告。这些警告来自 USD C++ 库。
\n现在让我们更详细地讨论这个问题。正如您之前所说，在调试模式下运行 AR 应用程序时，Xcode 控制台中会出现两个警告：
\n// Warning: in AppendProperty at line 859 of sdf/path.cpp - Can only append a \n// property \'preliminary:anchoring:type\' to a prim path (/)\n\n// Warning: in AppendProperty at line 859 of sdf/path.cpp - Can only append a\n// property \'triggers\' to a prim path (/)\n你可以很容易地在Pixar/Apple中找到C++语句path.cpp（只需在 Spotlight 搜索字符串中键入文件名）。这里是：
SdfPath::AppendProperty(TfToken const &propName) const {\n if (ARCH_UNLIKELY(_propPart)) {\n TF_WARN("Can only append a property \'%s\' to a prim path (%s)",\n propName.GetText(), GetText());\n return EmptyPath();\n }\n}\n那么，有什么意义呢？让我引用苹果文档：
\n\n\nPreliminary_AnchoringAPI将锚点\xe2\x80\x99s 中心指定为 prim\xe2\x80\x99s 原点，并将锚点的顶部指定为其法线向量点。运行时需要资产为此属性提供值。
\n
\n
preliminary:anchoring:type您可以在USDZ Schemas故事中阅读更多信息。
\n
换句话说，如果您在场景中使用带有初步生成锚点的文件，无论它们是在 Reality Composer 中分配的锚点还是为场景用 Python 定义的锚点.usdz，您都不会收到此类消息。
\n\nReality Composer也使用这些模式在其 USDZ 导出中描述了 AR 功能......
\n
关闭警告
\n如果这些消息确实让您烦恼，请将其关闭。
\n转到 Xcode 的菜单 Product \xe2\x80\x93 Scheme \xe2\x80\x93 Edit Scheme 并添加环境变量。
\nOS_ACTIVITY_MODE = disable\n
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