Reset ARSCNView background contents to its original source

Question

I'm capturing ARFrame's and applying filters, which works fine, but I want to turn off the filters and go back to the original camera feed, but I'm running into issues. This code is applying the filter:

 func session(_ session: ARSession, didUpdate frame: ARFrame) {
  let filterImage = setFilter(session.currentFrame)
  sceneView.scene.background.contents = context.createCGImage(filterImage, from: filterImage.extent)
 }

Once I set sceneView.scene.background.contents, I cannot set it back to the original source. The original source is an object called: SCNCaptureDeviceOutputConsumerSource, which is not in the documentation. I tried saving that object and setting the background contents with it again, but it will just display the last frame it was holding (so there will be a still image). It does not continuously update. I don't know how to make sceneView.scene.background.contents extract data from the same source as it was before I replaced it.

I tried setting sceneView.session.delegate = nil, but that did not work, it just stops updating, and the screen looks like it freezes.

Is there a way to reset ARSCNView background contents to the original source it was getting data from?

If I reload the ARSCNView, it works, but it takes at least a second and a half to reload:

   sceneView.session.delegate = nil
   sceneView = nil
   sceneView = ARSCNView(frame: view.bounds)
   view.addSubview(sceneView)
   sceneView.delegate = self
   sceneView.session.run(ARFaceTrackingConfiguration())

Thank you for any help you can give.

Answer 1

I'm new to Stackoverflow posting, If the quality of this answer isn't that high, that is the reason for it. I had the same problem as you. Here's how I fixed it.

First set the sceneView.scene.background.contents as a variable. Then you can change the sceneView.scene.background.contents to for example UIColor.lightGray.

If you want to reset it back to its original Source, just do as follows.

sceneView.scene.background.contents = originalSource

Just make sure to not change the variable originalSource, because then you are deleting your originalSource.

Hope this helped,

Best Regards