I tried to run the arcore samples for unity as described on the following page: https://developers.google.com/ar/develop/unity/quickstart-android
But it doesn't work. The app starts and it is searching for the planes, but the camera feed is black. In the logcat there is the following exception:
DllNotFoundException: arcore_unity_api
at (wrapper managed-to-native) GoogleARCoreInternal.ARPrestoCallbackManager/ExternApi:ArCoreUnity_setArPrestoInitialized (GoogleARCoreInternal.ARPrestoCallbackManager/EarlyUpdateCallback)
at GoogleARCoreInternal.ARPrestoCallbackManager.InitializeIfNeeded () [0x00000] in <filename unknown>:0
at GoogleARCoreInternal.ARCoreAndroidLifecycleManager.CreateSession (GoogleARCore.ARCoreSession sessionComponent) [0x00000] in <filename unknown>:0
at GoogleARCore.ARCoreSession.Start () [0x00000] in <filename unknown>:0
I also tried the plain android samples, which work fine. What could be the issue that it doesn't work with unity?
