Discover RealityKit APIs for iOS, macOS, and visionOS

// Add a highlight HoverEffectComponent 

let highlightStyle = HoverEffectComponent.HighlightHoverEffectStyle(color: .lightYellow, 
                                                                    strength: 0.8)
let hoverEffect = HoverEffectComponent(.highlight(highlightStyle))
spaceship.components.set(hoverEffect)

// Add a shader effect

let hoverEffect = HoverEffectComponent(.shader(.default))
spaceship.components.set(hoverEffect)

// Control acceleration with left hand

class HandTrackingSystem: System {

    func update(context: SceneUpdateContext) {
        let indexTipPosition = indexTipEntity.position(relativeTo: nil)
        let thumbTipPosition = thumbTipEntity.position(relativeTo: nil)

        let distance = distance(indexTipPosition, thumbTipPosition)

        let throttle = computeThrottle(with: distance)

        let force = spaceship.transform.forward * throttle
        spaceship.addForce(force, relativeTo: nil)
    }
}

// Adding a gravity force effect

struct Gravity: ForceEffectProtocol {

    var parameterTypes: PhysicsBodyParameterTypes { [.position, .distance] }
    var forceMode: ForceMode = .force

    func update(parameters: inout ForceEffectParameters) {
        guard let distances = parameters.distances,
              let positions = parameters.positions else { return }

        for i in 0..<parameters.physicsBodyCount {
            let force = computeForce(distances[i], positions[i])
            parameters.setForce(force, index: i)
        }
    }
}

// Activating the gravity force effect

let gravity = ForceEffect(effect: Gravity(),
                          spatialFalloff: SpatialForceFalloff(bounds: .sphere(radius: 8.0)),
                          mask: .asteroids)

planet.components.set(ForceEffectComponent(effects: [gravity]))

// Calculate initial velocity of the asteroid using radius and angle

let velocity = calculateVelocity(radius, angle)

let physicsMotion = PhysicsMotionComponent(linearVelocity: velocity)
asteroid.components.set(physicsMotion)

// Add a custom joint

guard let hookEntity = spaceship.findEntity(named: "Hook") else { return }
let hookOffset: SIMD3<Float> = hookEntity.position(relativeTo: spaceship)

let hookPin = spaceship.pins.set(named: "Hook", position: hookOffset)
let trailerPin = trailer.pins.set(named: "Trailer", position: .zero)

var joint = PhysicsCustomJoint(pin0: hookPin, pin1: trailerPin)

joint.angularMotionAroundX = .range(-.pi * 0.05 ... .pi * 0.05)
joint.angularMotionAroundY = .range(-.pi * 0.2 ... .pi * 0.2)
joint.angularMotionAroundZ = .range(-.pi * 0.2 ... .pi * 0.2)

joint.linearMotionAlongX = .fixed
joint.linearMotionAlongY = .fixed
joint.linearMotionAlongZ = .fixed

try joint.addToSimulation()

// Add a spotlight with shadow

guard let lightEntity = spaceship.findEntity(named: "HeadLight") else { return }

lightEntity.components.set(SpotLightComponent(color: .yellow, 
                                              intensity: 10000.0, 
                                              attenuationRadius: 6.0))

lightEntity.components.set(SpotLightComponent.Shadow())

// Disable shadow

let component = DynamicLightShadowComponent(
                    castsShadow: false)

entity.components.set(component)

// Enable portal crossing

portal.components.set(PortalComponent(target: portalWorld,
                                      clippingMode: .plane(.positiveZ),
                                      crossingMode: .plane(.positiveZ)))

spaceship.components.set(PortalCrossingComponent())

// Configure environmental lighting on the spaceship

var lightingConfig = EnvironmentLightingConfigurationComponent()

let distance: Float = computeShipDistanceFromPortal()
lightingConfig.environmentLightingWeight = mapDistanceToWeight(distance)

spaceship.components.set(lightingConfig)

// World tracking camera

RealityView { content in

#if os(iOS)

    content.camera = .worldTracking

#endif

}

// Multi-touch control views

#if os(iOS)

struct MultiTouchControlView : View {

    var body: some View {

        HStack {

            ThrottleControlView()

            Spacer()

            PitchRollControlView()

        }
    }

#endif