onEnterFieldOfVision and onExitFieldOfVision of AR.Trackable2DObject will be triggered whenever an image is recognized or lost.
Any drawable (e.g. AR.ImageDrawable) can be enabled/disabled by setting its enabled property. Disabled drawables won't be displayed and won't react on user interaction.
Screen clicks can be reacted upon by assigning a function to the AR.context.onScreenClicked trigger.
Let me know if you have any more question.
about 10 years ago
I was wondering if there was a way to delay the displaying of the overlay when the user puts their camera over the target image.
Basically, when the user puts the camera over the image, I want them to touch the screen to start the detecting of the image and then display the overlay, I don't want it to display as soon as the camera is over the image.