Antigravity AI Agents × Apple Vision Pro: the New Development Paradigm for Spatial Computing

// App entry point
import SwiftUI
 
@main
struct SpatialApp: App {
    var body: some Scene {
        // Main UI window
        WindowGroup {
            ContentView()
        }
        .windowStyle(.plain)
 
        // Immersive 3D space
        ImmersiveSpace(id: "MainSpace") {
            ImmersiveView()
        }
        .immersionStyle(selection: .constant(.mixed), in: .mixed)
    }
}

# Spatial Notes App - Project Context
 
## Overview
A spatial note-taking app for Apple Vision Pro.
Users place notes in 3D space and associate them with specific physical locations.
 
## Tech Stack
- visionOS 2.0+
- RealityKit (3D object placement)
- ARKit (spatial anchors)
- SwiftUI (UI layer)
- CloudKit (sync)
 
## Key Constraints
- All UI interactions must support eye input and indirect pinch gestures
- Spatial anchors use ARWorldTracking
- Performance target: maintain 90fps (Vision Pro standard frame rate)

import RealityKit
import SwiftUI
 
class NoteEntity: Entity, HasModel, HasCollision, HasInputTargetComponent {
    let noteText: String
    let noteColor: UIColor
 
    required init() {
        noteText = ""
        noteColor = .white
        super.init()
        setupComponents()
    }
 
    init(text: String, color: UIColor = .white) {
        noteText = text
        noteColor = color
        super.init()
        setupComponents()
    }
 
    private func setupComponents() {
        // Note card geometry (thin slab)
        let mesh = MeshResource.generateBox(size: SIMD3(0.3, 0.2, 0.01), cornerRadius: 0.02)
        let material = SimpleMaterial(
            color: noteColor.withAlphaComponent(0.85),
            roughness: 0.3,
            isMetallic: false
        )
        components.set(ModelComponent(mesh: mesh, materials: [material]))
 
        // Collision shape (for tap targeting)
        components.set(CollisionComponent(shapes: [.generateBox(size: SIMD3(0.3, 0.2, 0.01))]))
 
        // Interaction support
        components.set(InputTargetComponent())
 
        // Hover feedback
        components.set(HoverEffectComponent())
    }
}

import ARKit
import RealityKit
 
@MainActor
class SpatialAnchorManager: ObservableObject {
    private var arKitSession = ARKitSession()
    private var worldTrackingProvider = WorldTrackingProvider()
    private var anchors: [UUID: AnchorEntity] = [:]
 
    func startTracking() async {
        do {
            try await arKitSession.run([worldTrackingProvider])
        } catch {
            print("ARKit session start failed: \(error)")
        }
    }
 
    func placeNote(entity: NoteEntity, at transform: simd_float4x4) async -> UUID? {
        // Create a world anchor at the given position
        let anchor = AnchorEntity(.world(transform: transform))
        anchor.addChild(entity)
 
        // Record the anchor ID for persistence
        let anchorID = UUID()
        anchors[anchorID] = anchor
 
        return anchorID
    }
 
    func restoreAnchors(from savedData: [AnchorData]) async {
        for data in savedData {
            guard let transform = data.worldTransform else { continue }
            let entity = NoteEntity(text: data.text, color: data.color)
            let anchor = AnchorEntity(.world(transform: transform))
            anchor.addChild(entity)
            anchors[data.id] = anchor
        }
    }
}

struct SpatialButton: View {
    let title: String
    let systemImage: String
    let action: () -> Void
 
    @State private var isHovered = false
 
    var body: some View {
        Button(action: action) {
            Label(title, systemImage: systemImage)
                .font(.headline)
                .padding(.horizontal, 20)
                .padding(.vertical, 12)
        }
        .buttonStyle(.bordered)
        .tint(isHovered ? .blue : .secondary)
        .glassBackgroundEffect() // Vision Pro glass material
        .onHover { hovering in
            withAnimation(.easeInOut(duration: 0.15)) {
                isHovered = hovering
            }
        }
        // Expand the hover hit area for comfortable eye tracking
        .hoverEffect(.highlight)
        .contentShape(.hoverEffect, RoundedRectangle(cornerRadius: 12, style: .continuous))
    }
}

struct NoteDetailView: View {
    @Binding var note: Note
 
    var body: some View {
        VStack(alignment: .leading, spacing: 16) {
            TextEditor(text: $note.content)
                .font(.body)
                .scrollContentBackground(.hidden)
        }
        .padding()
        // Action buttons placed below the window as an ornament
        .ornament(visibility: .visible, attachmentAnchor: .scene(.bottom)) {
            HStack(spacing: 16) {
                SpatialButton(title: "Place in Space", systemImage: "arkit") {
                    // Anchor the note in the real world via ARKit
                }
                SpatialButton(title: "Share", systemImage: "square.and.arrow.up") {
                    // Share via SharePlay
                }
            }
            .padding()
            .glassBackgroundEffect()
        }
    }
}

import XCTest
import RealityKit
@testable import SpatialNotes
 
@MainActor
final class NoteEntityTests: XCTestCase {
    var testEntity: NoteEntity!
 
    override func setUp() async throws {
        testEntity = NoteEntity(text: "Test note", color: .blue)
    }
 
    func testEntityHasRequiredComponents() {
        XCTAssertNotNil(testEntity.components[ModelComponent.self],
                       "NoteEntity must have a ModelComponent")
        XCTAssertNotNil(testEntity.components[CollisionComponent.self],
                       "NoteEntity must have a CollisionComponent")
        XCTAssertNotNil(testEntity.components[InputTargetComponent.self],
                       "NoteEntity must have an InputTargetComponent")
    }
 
    func testEntityBounds() {
        let bounds = testEntity.visualBounds(relativeTo: nil)
        // Note card should be 30cm × 20cm × 1cm
        XCTAssertEqual(bounds.extents.x, 0.3, accuracy: 0.01,
                      "Note card width must be 0.3m")
        XCTAssertEqual(bounds.extents.y, 0.2, accuracy: 0.01,
                      "Note card height must be 0.2m")
    }
 
    func testColorApplication() {
        guard let model = testEntity.components[ModelComponent.self],
              let material = model.materials.first as? SimpleMaterial else {
            XCTFail("ModelComponent or SimpleMaterial not found")
            return
        }
        // Verify alpha is applied correctly
        XCTAssertEqual(material.color.tint.cgColor?.alpha, 0.85, accuracy: 0.01)
    }
}

// Recommended: Only update entities that have pending changes
class NoteUpdateSystem: System {
    static let query = EntityQuery(where: .has(NoteComponent.self))
 
    required init(scene: RealityKit.Scene) {}
 
    func update(context: SceneUpdateContext) {
        for entity in context.entities(matching: Self.query, updatingSystemWhen: .rendering) {
            guard let note = entity.components[NoteComponent.self],
                  note.needsUpdate else { continue }
 
            entity.components[ModelComponent.self]?.materials = note.currentMaterials
            entity.components[NoteComponent.self]?.needsUpdate = false
        }
    }
}

// Set meaningful accessibility labels on spatial entities
NoteEntity()
    .accessibilityLabel("Note: \(noteText)")
    .accessibilityValue("Placed in space")
    .accessibilityHint("Double-tap to edit")
    .accessibilityAddTraits(.isButton)