RealityKit Tutorial 2026 - Build Your First AR App for iOS in Xcode (Beginner's Guide)
Learn RealityKit by building your first AR app for iOS. In this beginner-friendly tutorial, you'll place and interact with 3D objects in the real world using your iPhone camera, SwiftUI, and Apple's RealityKit framework.
Apple AR Quick Look Gallery (For the Robot) : https://developer.apple.com/augmented...
In this tutorial:
RealityKit fundamentals (Entities, Anchors, ARView)
Project setup for AR development
Load and display 3D models (USDZ format)
Detect surfaces with raycasting
Place objects in AR with tap gestures
Scale objects with pinch gestures
Handle camera permissions
Test on real device
Perfect for iOS developers ready to add spatial computing to their skill set, or anyone curious about building AR experiences on Apple platforms.
⏱️ Chapters:
00:00 - What We're Building
00:33 - Project Setup & Permissions
02:09 - Add ARView to SwiftUI
07:05 - Load 3D Model (ModelEntity)
10:02 - Create Anchor
10:52 - Testing 3D Model
12:15 - Creating our Coordinator
15:50 - Raycasting
16:41 - Place Object with Tap Gesture
19:15 - Scale with Pinch Gesture
22:48 - Accessing controls in MakeUIView
24:55 - Testing our gestures
25:37 - Debug Overlays for testing
26:15 - Wrap up + Next steps
📱 Requirements:
Mac with Xcode 16+
iPhone running iOS 18+ (Simulator doesn't support AR)
Basic Swift and SwiftUI knowledge
3D model (we'll use Apple's sample assets)
AR Interactions:
Tap to place objects
Pinch to scale objects
Surface detection
Spatial anchoring
🎯 Why RealityKit in 2026:
Native Apple framework (optimized for iOS/visionOS)
SwiftUI integration (no UIKit required)
Automatic lighting and shadows
Hand tracking ready (visionOS compatibility)
Lower barrier than Unity/Unreal for Apple platforms
🛠️ Tools Used:
Xcode 16+ (IDE)
RealityKit (AR framework)
ARKit (device tracking)
SwiftUI (UI framework)
📦 3D Asset Resources:
Apple's Sample Models (built into Reality Composer)
Sketchfab (free USDZ models): https://sketchfab.com
Apple AR Quick Look Gallery: https://developer.apple.com/augmented...
🔗 Resources:
Full source code: https://github.com/NDCSwift/RealityKi...
Apple RealityKit Documentation: https://developer.apple.com/documenta...
Apple ARKit Documentation: https://developer.apple.com/documenta...
Reality Composer: https://developer.apple.com/augmented...
💡 Next Steps After This Tutorial:
Add animations (rotate, bounce, move)
Multiple object placement
Object deletion (tap to remove)
Occlusion (objects hide behind real furniture)
Custom 3D models in Blender
Physics simulations
visionOS adaptation (Vision Pro)
🎮 Real-World Applications:
Furniture placement apps (IKEA-style)
AR shopping experiences
Educational visualizations (anatomy, solar system)
Interior design tools
Games and entertainment
Industrial training simulations
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