Log in or register to post comments

Smart Terrain failing silently

May 22, 2020 - 11:34am #1

We have an app that enables and disables trackers depending on needs/context. We have been experiencing an issue on iOS where occasionally, but often, after returning to the app from background that the smart terrain system is broken. A shortened version of our logs look:

[ARManager] App Unpaused
INFO/AR(11251) 2020-05-22 14:12:00: Vuforia resumed.
Start Vuforia Engine
[VF_PlatformController] OnVuforiaPaused: False
[ARManager] UpdateTrackers: imageTracker: False deviceTracker: True surfaceTracker: True faceTracker: False
[VF_Tracker] TryEnableTracker on: ImageTracker : False
[VF_Tracker] Successfully stopped tracker: Vuforia.ObjectTracker
[VF_Tracker] TryEnableTracker on: DeviceTracker : True
Starting Positional Device Tracker.
[VF_Tracker] Successfully started tracker: Vuforia.PositionalDeviceTrackerImpl
[VF_Tracker] TryEnableTracker on: SufaceTracker : True
Starting Smart Terrain
[VF_Tracker] Successfully started tracker: Vuforia.SmartTerrainImpl
[VF_SurfaceTracker] Checking for plane hit
ERROR/AR(11251) 2020-05-22 14:12:04: Failed to do hit test. DeviceTracker seems to not have been started.
[VF_SurfaceTracker] CheckForPlaneHit FAIL at screenPosition: (0.5, 0.5, 0.5)

At that point, after getting the "Failed to do hit test. DeviceTracker seems to not have been started", I am unable to get the smart terrain tracker to work even after trying to restart it and the positional device tracker. Only restarting the app will resolve the issue.



Smart Terrain failing silently

May 26, 2020 - 6:21am #3

Vuforia SDK: 9.1.7

Unity version: 2019.2.21f

Device: all iPhones. tested on iPhone 8, iPhone X, iPhone SE2

OS version of device: 13.4.1


NOTE: we have other apps that use the same code base but DONOT display this issue. the only different is that the other apps use an older Vuforia: 8.6.10.

Smart Terrain failing silently

May 25, 2020 - 12:45am #2


Could you please confirm below info:

Vuforia SDK:

Unity version:


OS version of device:

Thank you.

Vuforia Engine Support

Log in or register to post comments