Mujo Spatial無常空間

class="keyword">import SwiftUI
class="keyword">import RealityKit

@Observable
final class SummerRainEnvironment {
    var intensity: Float = class="number">0.6
    var wind: SIMD2<Float> = [class="number">0.3, -class="number">0.8]
    var twilight: Float = class="number">0.4

    func update(_ ctx: AFMContext) {
        intensity = clamp(ctx.gazeIntensity * class="number">0.8 + class="number">0.2, class="number">0, class="number">1)
        wind = ctx.ambientWind()
        twilight = ctx.timeOfDay
    }
}

class="keyword">struct SummerRainView: View {
    @State private var env = SummerRainEnvironment()
    @State private var session = ARKitSession()

    var body: some View {
        RealityView { content in
            let entity = Entity()
            entity.components.set(ParticleEmitterComponent())
            content.add(entity)
            session.run([env])
        } update: { content in
            guard let emitter = content.entities.first?
                .components[ParticleEmitterComponent.self]
            else { return }
            emitter.mainEmitter.rate = Int(env.intensity * class="number">4000)
            emitter.mainEmitter.speed = simd_float3(
                env.wind.x, env.wind.y, class="number">0
            )
        }
    }
}