Google cardboard
10 July 2017 12:40
You could probably do it with an invisible line parented to the camera and use a collision sensor.
API Link.
API Link.
13 July 2017 15:16
13 July 2017 16:28
There is a Viewport Alignment ability that may help you. In your link, I could not see how Babylon does GUI in VR. How can you touch it if it is on your face?