Creating an excellent AR experience has been made a lot simpler with the great features that exist in ARKit. However, there still are several things to keep in mind if you want to build an AR experience that users will love.

Certain conditions, such as lighting, the environment, and even what the user is doing, can have an impact on the AR experience. In this section, you will implement an AR gallery, and you will discover firsthand how ARKit is both amazingly awesome and sometimes a little bit fragile.

First, you'll set up a session in ARKit so you can implement image tracking to discover certain predefined images in the world, and you'll show some text above the found picture. Then, you'll implement another feature that allows users to place art from a gallery in the app in their own room.

If you want to follow along with the steps to implement the ARKit gallery, make sure to grab the ARGallery start project from the book's code bundle. Before you move on to implementing the AR gallery, explore the starter project for a little bit. The user interface that is prepared contains an instance of ARSCNView; this is the view that will be used to render the AR experience. A collection view has been added in preparation of the user adding their own images to the gallery, and a view for error messages was added to inform the user about certain things that might be wrong.

You'll find that the project is quite basic so far. All the existing code does is set up the collection view, and some code was added to handle errors during the AR session. Let's implement image tracking, shall we?