ax-3d-games

2D/3D Games & Spatial Content

Quick Patterns

SpriteKit 2D Scene (SwiftUI)

import SpriteKit
import SwiftUI

class GameScene: SKScene {
    override func didMove(to view: SKView) {
        physicsWorld.contactDelegate = self
        physicsWorld.gravity = CGVector(dx: 0, dy: -9.8)
        let player = SKSpriteNode(imageNamed: "player")
        player.position = CGPoint(x: size.width / 2, y: size.height / 2)
        player.physicsBody = SKPhysicsBody(circleOfRadius: player.size.width / 2)
        addChild(player)
    }
}

struct GameView: View {
    var body: some View {
        SpriteView(scene: GameScene(size: CGSize(width: 390, height: 844)))
            .ignoresSafeArea()
    }
}

RealityKit 3D Content (SwiftUI, iOS 18+)

import RealityKit
import SwiftUI

struct ContentView: View {
    var body: some View {
        RealityView { content in
            let box = ModelEntity(
                mesh: .generateBox(size: 0.1),
                materials: [SimpleMaterial(color: .blue, isMetallic: true)]
            )
            box.position = [0, 0.5, -1]
            box.components.set(InputTargetComponent())
            box.components.set(CollisionComponent(shapes: [.generateBox(size: [0.1, 0.1, 0.1])]))
            content.add(box)
        }
        .gesture(TapGesture().targetedToAnyEntity().onEnded { value in
            value.entity.position.y += 0.1
        })
    }
}

RealityKit Custom ECS Component + System

struct HealthComponent: Component {
    var current: Int = 100
    var max: Int = 100
}

struct DamageSystem: System {
    static let query = EntityQuery(where: .has(HealthComponent.self))

    init(scene: Scene) {}

    func update(context: SceneUpdateContext) {
        for entity in context.entities(matching: Self.query, updatingSystemWhen: .rendering) {
            var health = entity.components[HealthComponent.self]!
            if health.current <= 0 { entity.removeFromParent() }
        }
    }
}

// Register: HealthComponent.registerComponent(); DamageSystem.registerSystem()