Using images as triggers not trackables

Hi,

I'm wondering if anybody knows how to use images (QRCodes) as triggers for placing an object? I don't want to use image tracking but rather plane tracking but I don't want the user to be tapping on the screen to place but use an image to trigger the placement at the images location and then use plane tracking from there on?

Thanks

John

 

just trigger a function on ARPlaneManager.trackables.added and set a bool that it's triggered to prevent further reaction