SCNScene.write() doesn't call the delegate, how to fix it?












0















In SCNScene.write(), the signature allows to specify a delegate which is used to resolve how to save, principally, texture assets:



func write(to url: URL, options: [String : Any]? = nil, delegate: SCNSceneExportDelegate?, progressHandler: SCNSceneExportProgressHandler? = nil) -> Bool


Documentation here



However, when I try to use it, the delegate never gets called, even in situations in which, I think, it should:



...
guard let shipText = Bundle.main.url(forResource: "texture", withExtension: "png", subdirectory: "art.scnassets") else {
print("Couldn't retrieve texture")
return
}

do {
let scene = SCNScene()
let boxGeom = SCNBox(width: 0.1, height: 0.1, length: 0.1, chamferRadius: 0)
boxGeom.firstMaterial!.diffuse.contents = shipText.path
boxGeom.firstMaterial!.lightingModel = .constant
let boxNode = SCNNode(geometry: boxGeom)
scene.rootNode.addChildNode(boxNode)

let fileMan = FileManager.default

let docsDir = try fileMan.url(for: .documentDirectory,
in: .userDomainMask,
appropriateFor: nil, create: true)
let uuid = UUID.init().uuidString
let exportBaseName = docsDir.appendingPathComponent(uuid, isDirectory: false)
print("exportBaseName: (exportBaseName)")

let daeExport = exportBaseName.appendingPathExtension("dae")
let scnExport = exportBaseName.appendingPathExtension("scn")

// This prints true
print(scene.write(to: scnExport, options: nil, delegate: self, progressHandler: nil))

// This prints true
print(scene.write(to: daeExport, options: nil, delegate: self, progressHandler: nil))

}
catch {
print(error.localizedDescription)
}

...

...

// This never gets called
extension ViewController: SCNSceneExportDelegate {
func write(_ image: UIImage, withSceneDocumentURL documentURL: URL, originalImageURL: URL?) -> URL? {
print("Delegate being called: ", image, documentURL, originalImageURL)
return nil
}
}


This is an issue to me because I am trying to export the scenes correctly and being able to re-write the location of the textures which are used in the materials is a feature I need.



Could someone tell me if I'm doing something wrong, if anything?










share|improve this question



























    0















    In SCNScene.write(), the signature allows to specify a delegate which is used to resolve how to save, principally, texture assets:



    func write(to url: URL, options: [String : Any]? = nil, delegate: SCNSceneExportDelegate?, progressHandler: SCNSceneExportProgressHandler? = nil) -> Bool


    Documentation here



    However, when I try to use it, the delegate never gets called, even in situations in which, I think, it should:



    ...
    guard let shipText = Bundle.main.url(forResource: "texture", withExtension: "png", subdirectory: "art.scnassets") else {
    print("Couldn't retrieve texture")
    return
    }

    do {
    let scene = SCNScene()
    let boxGeom = SCNBox(width: 0.1, height: 0.1, length: 0.1, chamferRadius: 0)
    boxGeom.firstMaterial!.diffuse.contents = shipText.path
    boxGeom.firstMaterial!.lightingModel = .constant
    let boxNode = SCNNode(geometry: boxGeom)
    scene.rootNode.addChildNode(boxNode)

    let fileMan = FileManager.default

    let docsDir = try fileMan.url(for: .documentDirectory,
    in: .userDomainMask,
    appropriateFor: nil, create: true)
    let uuid = UUID.init().uuidString
    let exportBaseName = docsDir.appendingPathComponent(uuid, isDirectory: false)
    print("exportBaseName: (exportBaseName)")

    let daeExport = exportBaseName.appendingPathExtension("dae")
    let scnExport = exportBaseName.appendingPathExtension("scn")

    // This prints true
    print(scene.write(to: scnExport, options: nil, delegate: self, progressHandler: nil))

    // This prints true
    print(scene.write(to: daeExport, options: nil, delegate: self, progressHandler: nil))

    }
    catch {
    print(error.localizedDescription)
    }

    ...

    ...

    // This never gets called
    extension ViewController: SCNSceneExportDelegate {
    func write(_ image: UIImage, withSceneDocumentURL documentURL: URL, originalImageURL: URL?) -> URL? {
    print("Delegate being called: ", image, documentURL, originalImageURL)
    return nil
    }
    }


    This is an issue to me because I am trying to export the scenes correctly and being able to re-write the location of the textures which are used in the materials is a feature I need.



    Could someone tell me if I'm doing something wrong, if anything?










    share|improve this question

























      0












      0








      0








      In SCNScene.write(), the signature allows to specify a delegate which is used to resolve how to save, principally, texture assets:



      func write(to url: URL, options: [String : Any]? = nil, delegate: SCNSceneExportDelegate?, progressHandler: SCNSceneExportProgressHandler? = nil) -> Bool


      Documentation here



      However, when I try to use it, the delegate never gets called, even in situations in which, I think, it should:



      ...
      guard let shipText = Bundle.main.url(forResource: "texture", withExtension: "png", subdirectory: "art.scnassets") else {
      print("Couldn't retrieve texture")
      return
      }

      do {
      let scene = SCNScene()
      let boxGeom = SCNBox(width: 0.1, height: 0.1, length: 0.1, chamferRadius: 0)
      boxGeom.firstMaterial!.diffuse.contents = shipText.path
      boxGeom.firstMaterial!.lightingModel = .constant
      let boxNode = SCNNode(geometry: boxGeom)
      scene.rootNode.addChildNode(boxNode)

      let fileMan = FileManager.default

      let docsDir = try fileMan.url(for: .documentDirectory,
      in: .userDomainMask,
      appropriateFor: nil, create: true)
      let uuid = UUID.init().uuidString
      let exportBaseName = docsDir.appendingPathComponent(uuid, isDirectory: false)
      print("exportBaseName: (exportBaseName)")

      let daeExport = exportBaseName.appendingPathExtension("dae")
      let scnExport = exportBaseName.appendingPathExtension("scn")

      // This prints true
      print(scene.write(to: scnExport, options: nil, delegate: self, progressHandler: nil))

      // This prints true
      print(scene.write(to: daeExport, options: nil, delegate: self, progressHandler: nil))

      }
      catch {
      print(error.localizedDescription)
      }

      ...

      ...

      // This never gets called
      extension ViewController: SCNSceneExportDelegate {
      func write(_ image: UIImage, withSceneDocumentURL documentURL: URL, originalImageURL: URL?) -> URL? {
      print("Delegate being called: ", image, documentURL, originalImageURL)
      return nil
      }
      }


      This is an issue to me because I am trying to export the scenes correctly and being able to re-write the location of the textures which are used in the materials is a feature I need.



      Could someone tell me if I'm doing something wrong, if anything?










      share|improve this question














      In SCNScene.write(), the signature allows to specify a delegate which is used to resolve how to save, principally, texture assets:



      func write(to url: URL, options: [String : Any]? = nil, delegate: SCNSceneExportDelegate?, progressHandler: SCNSceneExportProgressHandler? = nil) -> Bool


      Documentation here



      However, when I try to use it, the delegate never gets called, even in situations in which, I think, it should:



      ...
      guard let shipText = Bundle.main.url(forResource: "texture", withExtension: "png", subdirectory: "art.scnassets") else {
      print("Couldn't retrieve texture")
      return
      }

      do {
      let scene = SCNScene()
      let boxGeom = SCNBox(width: 0.1, height: 0.1, length: 0.1, chamferRadius: 0)
      boxGeom.firstMaterial!.diffuse.contents = shipText.path
      boxGeom.firstMaterial!.lightingModel = .constant
      let boxNode = SCNNode(geometry: boxGeom)
      scene.rootNode.addChildNode(boxNode)

      let fileMan = FileManager.default

      let docsDir = try fileMan.url(for: .documentDirectory,
      in: .userDomainMask,
      appropriateFor: nil, create: true)
      let uuid = UUID.init().uuidString
      let exportBaseName = docsDir.appendingPathComponent(uuid, isDirectory: false)
      print("exportBaseName: (exportBaseName)")

      let daeExport = exportBaseName.appendingPathExtension("dae")
      let scnExport = exportBaseName.appendingPathExtension("scn")

      // This prints true
      print(scene.write(to: scnExport, options: nil, delegate: self, progressHandler: nil))

      // This prints true
      print(scene.write(to: daeExport, options: nil, delegate: self, progressHandler: nil))

      }
      catch {
      print(error.localizedDescription)
      }

      ...

      ...

      // This never gets called
      extension ViewController: SCNSceneExportDelegate {
      func write(_ image: UIImage, withSceneDocumentURL documentURL: URL, originalImageURL: URL?) -> URL? {
      print("Delegate being called: ", image, documentURL, originalImageURL)
      return nil
      }
      }


      This is an issue to me because I am trying to export the scenes correctly and being able to re-write the location of the textures which are used in the materials is a feature I need.



      Could someone tell me if I'm doing something wrong, if anything?







      ios swift scenekit arkit modelio






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      share|improve this question










      asked Nov 22 '18 at 18:36









      FloraFlora

      3718




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