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UI buttons disappear after trackig is lost and never get recoverd

July 1, 2015 - 1:03pm #2

Vuforia SDK Version: Vuforia4.2.3 -

Description with steps to reproduce:

In a Unity project based on the "Image Target" sample, placed buttons in the canvas (nGUI or onGUI(script)).

The display of the buttons is independent on the recognition of the target.

When target is recognized buttons are shown, but when target moves out of the view the buttons will disappear and will not be displayed again even when the target gets back into the view.

Tried extended tracking ON and OFF and observed the same issue.


  • Tools:  Unity5 Vuforia4.2.3
  • OS/Device: iOS, iPad
  • App: Use Vuforia's Unity sample - "Image Target" as reference
  • Target: Observe the issue even when using the standard target - Chips
  • Steps:
    • Remove main camera and add ARCamera and image target
    • Place a cube in image target
    • Place buttons in canvas (using NGUI)
    • File->Build->Run on iPad









Development OS (Mac OS X, Windows, Linux): iOS -

Mobile OS and Version: N/A -

Mobile Device Manufacturer and Model name: iPad -

Do the Vuforia Sample Applications show the same behavior?: Tested App is based on Vuforia sample - Image Target

UI buttons disappear after trackig is lost and never get recover

July 2, 2015 - 4:27am #1

What Unity version are you using ?

5.0.1 and 5.0.2, and 5.1.0 are known to have issues with UI rendering with Vuforia 4.2.3, as reported in other forum threads.

The recommended version of Unity 5.0.x is 5.0.3 or newer.

The recommneded version for Unity 5.1.x is 5.1.1 or newer.


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