what's the easiest way to get started building an AR app for iPad and iPhone?

To get started building an AR app for iPad and iPhone, you can leverage RealityKit, ARKit, and SwiftUI. Here are some steps and resources to help you begin:

1. Set Up Spatial Tracking: Start by setting up spatial tracking so that your app can understand hand and environment data. This is crucial for creating interactive AR experiences.

   • You can follow the session Build a spatial drawing app with RealityKit for detailed instructions on setting up spatial tracking.

2. Build a User Interface: Create a user interface that allows users to interact with the AR elements. This can include controls for manipulating AR objects or drawing in a 3D space.

   • The same session, Build a spatial drawing app with RealityKit, provides guidance on building a spatial user interface.

3. Use Reality Composer: Reality Composer is an intuitive tool for creating and placing virtual content. It can be a great starting point for beginners.

   • The session Explore object tracking for visionOS demonstrates how to use Reality Composer Pro to anchor virtual content.

4. Leverage ARKit and RealityKit: These frameworks are at the core of developing AR experiences. They provide powerful tools for creating immersive and interactive AR applications.

   • The Platforms State of the Union session highlights the importance of RealityKit and ARKit in building spatial apps.

5. Experiment with Object Capture: If your app involves 3D models, you can use Object Capture to create high-quality 3D models from real-world objects.

   • The session Discover area mode for Object Capture explains how to use the new iOS API for object capture.

By following these steps and utilizing the resources provided in the WWDC sessions, you can get started on building an AR app for iPad and iPhone.