Ytukyg

I'm trying to persist a model in ARKit using the ARWorldMap. I can save and load the models, but the orientation I apply to the objects before I save is not persisted with the object.

What I'm currently doing

Objects are saved and loaded:

  /// - Tag: GetWorldMap

  @objc func saveExperience(_ button: UIButton) {

    sceneView.session.getCurrentWorldMap { worldMap, error in

      guard let map = worldMap

        else { self.showAlert(title: "Can't get current world map", message: error!.localizedDescription); return }



      // Add a snapshot image indicating where the map was captured.

      guard let snapshotAnchor = SnapshotAnchor(capturing: self.sceneView) else {

        fatalError("Can't take snapshot")



      }

      map.anchors.append(snapshotAnchor)



      do {

        let data = try NSKeyedArchiver.archivedData(withRootObject: map, requiringSecureCoding: true)

        try data.write(to: self.mapSaveURL, options: [.atomic])

        DispatchQueue.main.async {

          self.loadExperienceButton.isHidden = false

          self.loadExperienceButton.isEnabled = true

        }

      } catch {

        fatalError("Can't save map: (error.localizedDescription)")

      }

    }

  }



  /// - Tag: RunWithWorldMap

  @objc func loadExperience(_ button: UIButton) {



    /// - Tag: ReadWorldMap

    let worldMap: ARWorldMap = {

      guard let data = mapDataFromFile

        else { fatalError("Map data should already be verified to exist before Load button is enabled.") }

      do {

        guard let worldMap = try NSKeyedUnarchiver.unarchivedObject(ofClass: ARWorldMap.self, from: data)

          else { fatalError("No ARWorldMap in archive.") }

        return worldMap

      } catch {

        fatalError("Can't unarchive ARWorldMap from file data: (error)")

      }

    }()



    // Display the snapshot image stored in the world map to aid user in relocalizing.

    if let snapshotData = worldMap.snapshotAnchor?.imageData,

      let snapshot = UIImage(data: snapshotData) {

      self.snapshotThumbnail.image = snapshot

    } else {

      print("No snapshot image in world map")

    }

    // Remove the snapshot anchor from the world map since we do not need it in the scene.

    worldMap.anchors.removeAll(where: { $0 is SnapshotAnchor })



    let configuration = self.defaultConfiguration // this app's standard world tracking settings

    configuration.initialWorldMap = worldMap

    sceneView.session.run(configuration, options: [.resetTracking, .removeExistingAnchors])



    isRelocalizingMap = true

    virtualObjectAnchor = nil

  }

Rotation:

@objc func didRotate(_ gesture: UIRotationGestureRecognizer) {

    sceneView.scene.rootNode.eulerAngles.y = objectRotation

    gesture.rotation = 0

}

And then it's rendered:

  func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {

    guard anchor.name == virtualObjectAnchorName else {

      return

    }



    // save the reference to the virtual object anchor when the anchor is added from relocalizing

    if virtualObjectAnchor == nil {

      virtualObjectAnchor = anchor

    }

    node.addChildNode(virtualObject)

  }

How can I do this?

How can I go about doing this? I have tried multiple solutions, but the orientation is never kept. It loads the object at the correct position, but rotation and scaling is never kept, even if I apply it to the rootnode. The only option I can see is to also store the transform as a seperate data object, and load that and apply it. But seems like it should be possible to store this data with the object.