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我不确定我是否正确地处理了这个问题。我有一个长矩形框，我想在应用程序启动时从相机添加 -1.5。但我希望它是静止的，就像 ARKit 项目中默认的船一样。但是每当我添加它时，对象都会与相机保持相对（距离）。即 - 向它移动，它向后移动，向后移动，它向前移动。

我虽然在现场放一个锚可以解决这个问题，但我仍然得到同样的影响。这是我的代码。任何帮助，将不胜感激：

override func viewDidLoad() {
    super.viewDidLoad()

    // Set the view's delegate
    sceneView.delegate = self

    // Show statistics such as fps and timing information
    //sceneView.showsStatistics = true

    // Create a new scene
    let scene = SCNScene()//

    // Set the scene to the view
    sceneView.scene = scene 
}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    // Create a session configuration
    let configuration = ARWorldTrackingConfiguration()

    //configuration.planeDetection = .horizontal

    // Run the view's session
    sceneView.session.run(configuration)

    print(#function, sceneView.session.currentFrame)
}

// MARK: - SCNSceneRendererDelegate
    func renderer(_ renderer: SCNSceneRenderer, didRenderScene scene: SCNScene, atTime time: TimeInterval) {
        print(#function, sceneView.session.currentFrame)

        if !hasPortalAnchor {

            //add anchor - this may take a second as the current frames are initially nil
            if let currentFrame = sceneView.session.currentFrame {
                var translation = matrix_identity_float4x4
                translation.columns.3.z = -1.3
                let transform = simd_mul(currentFrame.camera.transform, translation)

                if (arrAnchors.count < 1) {
                let portalAnchor = ARAnchor(transform: transform)
                sceneView.session.add(anchor: portalAnchor)
                arrAnchors.append(portalAnchor)
                print(arrAnchors)
                }
            }

        } else {
            hasPortalAnchor = true
        }          
    }

//this function gets called whenever we add an anchor to our scene
func renderer(_ renderer: SCNSceneRenderer, nodeFor anchor: ARAnchor) -> SCNNode? {

    let portalScene = SCNScene(named: "art.scnassets/portal.scn")! 
    return portalScene.rootNode.childNode(withName: "portal", recursively: true)   
}
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1 回答 1

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您是否故意使用该renderer(_:)功能？如果没有，那么您可以使用以下内容viewDidLoad：

override func viewDidLoad() {
    super.viewDidLoad()

    sceneView.delegate = self

    let scene = SCNScene(named: "art.scnassets/portal.scn")!

    sceneView.scene = scene

}

这将用您的门户场景替换启动时出现的默认火箭。（请注意，如果尚未建立跟踪，则场景可能会四处移动。例如，如果光线较暗，或者您处于没有很多特征的环境中（例如空白或重复的墙））。

看起来你实际上并没有设置hasPortalAnchor为true？是设置在别的地方吗？

于 2018-01-13T02:25:41.993 回答