RealityKit Build AR experiences on iOS using RealityKit for rendering and ARKit for world tracking. Covers , entity management, raycasting, scene understanding, and gesture-based interactions. Targets Swift 6.3 / iOS 26+. Contents - Setup - RealityView Basics - Loading and Creating Entities - Anchoring and Placement - Raycasting - Gestures and Interaction - Scene Understanding - Common Mistakes - Review Checklist - References Setup Project Configuration 1. Add to Info.plist 2. On iOS, displays an AR camera view by default (iOS 18+, macOS 15+); use camera mode for explicit non-AR fallback 3. N…