title: How to detect UI Objects from Main Camera object when using Google Cardboard VR SDK for Unity
body: <p>When using Google Cardboard VR SDK for Unity, how can I detect when the Main Camera object looks at UI objects inside Canvas? OnPointerEnter() and OnPointerExit() happens when I look at 3D Objects in the <em>samples</em> project that Google offers, but there is no way to do it for UI Objects.</p>