how do i make a distance detection in ARKit

To make a distance detection in ARKit, you can use the spatial tracking capabilities provided by RealityKit. Specifically, you can track hand movements and compute distances between anchor entities. Here's a brief overview of how you can achieve this:

Set Up Hand Tracking: Use RealityKit's spatial tracking API to track hand movements. You can create anchor entities for specific points on the hand, such as the index fingertip and thumb tip.
Compute Distance: Inside your custom update function, query the positions of these anchor entities. Use the entity position API to compute the distance between the two anchor entities.
Map Distance to Functionality: You can map the computed distance to a specific functionality, such as controlling a throttle value. For example, a shorter distance between the fingertips could increase the throttle value, which can then be used to control an object, like accelerating a spaceship.

For more detailed information, you can refer to the session Discover RealityKit APIs for iOS, macOS, and visionOS (07:32) where this concept is discussed.