I'm trying to make an application that requires that AR be toggled on and off and when it's on the user should be able to reselect a position to spawn a set of objects. So far it's been a fun journey I've managed to get something working well in the Editor but not when run on an iPad. Here's the flow 1. Start the app with AR disabled. 2. Allow the user to turn on AR using a button. 3. Allow the user to select a spot to spawn some objects. 4. Allow the user to turn off AR and do some other stuff. 5. Go back to step 2. turn AR back on and then reposition the original set of objects to a new spot. All this is working but for the last step. I can get the first spawn to work and I can get a Plane Finder to show up and I can see that the script I have attached to the OnContentPlaced event is fired so I can turn off the plane finder, but when the objects are moved to the new position it just seems to randomly put them anywhere in space. I have a test app that doesn't try to turn the AR function on and off itself and that works perfectly. When that app is paused I call this: TrackerManager.Instance.GetTracker<ObjectTracker>().Stop(); and when it unpauses this: TrackerManager.Instance.GetTracker<ObjectTracker>().Start(); And that allows me to then update the position such that the objects appear where the user taps. But if I put in any code that does the pause unpause using a button to enable and disable the AR instead of hijacking OnApplicationPause it totally fails. Is there some trick I'm missing that lets you reinitialise the positioning code? I notice in the docs that it says Initializes the tracker of the given type Initializing a tracker must not be done when the CameraDevice is initialized or started. This function will return null if the CameraDevice is currently initialized. How do I make sure the CameraDevice is not initialised? At the point I start or stop the tracker manager the AR camera is disabled which appears to turn off all the Vuforia functionality and I had hoped would mean the CameraDevice is not started, but there seems to be no information on how to actually do what I want to do. Anyone done this or know how to achieve it?