One of the features of AR is its ability to detect flat surfaces through device cameras and other sensors (such as the LIDAR sensors on some high-end iPads and iPhones). This recipe will illustrate how a Unity raycast, combined with some AR Foundation objects and scripts, lets us create a basic AR furniture previewer just by tapping on the screen where we want a virtual 3D piece of furniture to be displayed:
Figure 15.81 – Adding yellow sphere-cube sofa furniture at the bottom of a flight of stairs!
