When leaving a scene that uses Motion Tracking, Area Learning, and WebcamTexture and moving to a menu scene that uses a standard Camera and no Tango prefabs, the application will crash.
02-25 13:32:46.285 886-1005/? W/InputDispatcher﹕ channel '6510e8f0 com.google.atap.app/com.unity3d.player.UnityPlayerNativeActivity (server)' ~ Consumer closed input channel or an error occurred. events=0x9
02-25 13:32:46.285 886-1005/? E/InputDispatcher﹕ channel '6510e8f0 com.google.atap.app/com.unity3d.player.UnityPlayerNativeActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
02-25 13:32:46.292 165-5890/? E/Camera2-FrameProcessor﹕ get3aResult: Camera 0: No afState provided by HAL for frame 709!
02-25 13:32:46.308 165-5896/? E/Surface﹕ queueBuffer: error queuing buffer to SurfaceTexture, -32
02-25 13:32:46.308 165-5896/? E/Camera3-OutputStream﹕ returnBufferCheckedLocked: Stream 0: Error queueing buffer to native window: Broken pipe (-32)
02-25 13:32:46.308 165-5896/? E/Camera3-Device﹕ Can't return buffer 0 for frame 708 to its stream: Broken pipe (-32)
02-25 13:32:46.308 165-5888/? E/Camera3-OutputStream﹕ getBufferLocked: Stream 0: Can't dequeue next output buffer: Broken pipe (-32)
02-25 13:32:46.308 165-5888/? E/Camera3-Device﹕ RequestThread: Can't get output buffer, skipping request: Broken pipe (-32)
02-25 13:32:46.308 165-5888/? E/Camera3-OutputStream﹕ getBufferLocked: Stream 0: Can't dequeue next output buffer: Broken pipe (-32)
02-25 13:32:46.308 165-5888/? E/Camera3-Device﹕ RequestThread: Can't get output buffer, skipping request: Broken pipe (-32)
02-25 13:32:46.308 165-5888/? E/Camera3-OutputStream﹕ getBufferLocked: Stream 0: Can't dequeue next output buffer: Broken pipe (-32)
02-25 13:32:46.308 165-5888/? E/Camera3-Device﹕ RequestThread: Can't get output buffer, skipping request: Broken pipe (-32)
02-25 13:32:46.308 165-5888/? E/Camera3-OutputStream﹕ getBufferLocked: Stream 0: Can't dequeue next output buffer: Broken pipe (-32)
02-25 13:32:46.308 165-5888/? E/Camera3-Device﹕ RequestThread: Can't get output buffer, skipping request: Broken pipe (-32)
02-25 13:32:46.308 165-5888/? E/Camera3-OutputStream﹕ getBufferLocked: Stream 0: Can't dequeue next output buffer: Broken pipe (-32)
02-25 13:32:46.309 165-165/? W/CameraService﹕ Disconnecting camera client 0xb8ac5f40 since the binder for it died (this pid 165)
02-25 13:32:46.309 165-165/? I/Camera2Client﹕ stopPreviewL: stopPreview ++
02-25 13:32:46.309 183-670/? I/sensor-hub-uart﹕ sensor_hub_uart_msg_queue: 54 15 9 2 returned 0
02-25 13:32:46.309 183-5904/? I/sensor-hub-uart﹕ wrote 54:15:9:2 0 0 to 13
02-25 13:32:46.309 886-1131/? I/ActivityManager﹕ Process com.google.atap.app (pid 5673) has died.
Is there any method that must be called when done using Tango prefabs and leaving the scene? Any idea why the crash is occurring?
I don't use Unity, but at the C level you need to call TangoService_disconnect - if you don't do that, and you do have live callbacks, well, who knows what will happen :-)