To use object tracking on ARKit, you will first need to create a Reference Object Library. See the AR Subsystems documentation on object tracking for instructions.
Next, you will need to create an ARKit-specific version of the reference object. See Scanning and Detecting 3D Objects for an app that you can run on an iOS device that will produce such a scan.
The scanning app produces a file with the extension
.arobject. Drag each
.arobject file into your Unity project, and Unity will generate an
ARKitReferenceObjectEntry for it.
You should see some metadata and a preview image of the scan.
The arobject can now be added to a reference object in your reference object library: