Create enhanced spatial computing experiences with ARKit

3:35 - RoomTrackingProvider

// RoomTrackingProvider

@available(visionOS, introduced: 2.0)
public final class RoomTrackingProvider: DataProvider, Sendable {

    /// The room which a person is currently in, if any.
    public var currentRoomAnchor: RoomAnchor? { get }

    /// An async sequence of all anchor updates.
    public var anchorUpdates: AnchorUpdateSequence<RoomAnchor> { get }

    ...
}

4:20 - RoomAnchor

@available(visionOS, introduced: 2.0)
public struct RoomAnchor: Anchor, Sendable, Equatable {
    /// True if this is the room which a person is currently in.
    public var isCurrentRoom: Bool { get }

    /// Get the geometry of the mesh in the anchor's coordinate system.
    public var geometry: MeshAnchor.Geometry { get }
    /// Get disjoint mesh geometries of a given classification.
    public func geometries(of classification: MeshAnchor.MeshClassification) -> 
        [MeshAnchor.Geometry]

    /// True if this room contains the given point.
    public func contains(_ point: SIMD3<Float>) -> Bool
   
    /// Get the IDs of the plane anchors associated with this room.
    public var planeAnchorIDs: [UUID] { get }
    /// Get the IDs of the mesh anchors associated with this room.
    public var meshAnchorIDs: [UUID] { get }
}

8:06 - Load Object Tracking referenceobject

// Object tracking

Task {
    do {
        let url = URL(fileURLWithPath: "/path/to/globe.referenceobject")
        let referenceObject = try await ReferenceObject(from: url)
        let objectTracking = ObjectTrackingProvider(referenceObjects: [referenceObject])
    } catch {
        // Handle reference object loading error.
    }
    ...
}

8:27 - Run ARKitSession with ObjectTracking provider

let session = ARKitSession()

Task {
    do {
        try await session.run([objectTracking])
    } catch {
        // Handle session run error.
    }
    
    for await event in session.events {
        switch event {
        case .dataProviderStateChanged(_, newState: let newState, _):
            if newState == .running {
                // Ready to start processing anchor updates.
            }
        ...
        }
    }
}

8:43 - ObjectAnchor

// ObjectAnchor

@available(visionOS, introduced: 2.0)
public struct ObjectAnchor: TrackableAnchor, Sendable, Equatable {

    /// An axis-aligned bounding box.
    public struct AxisAlignedBoundingBox: Sendable, Equatable {
        ...
    }

    /// The bounding box of this anchor.
    public var boundingBox: AxisAlignedBoundingBox { get }

    /// The reference object which this anchor corresponds to.
    public var referenceObject: ReferenceObject { get }
}

11:03 - World Tracking - reacting to changes in lighting conditions

struct WellPreparedView: View {
    @Environment(\.worldTrackingLimitations) var worldTrackingLimitations
    
    var body: some View {
        ...
 
        .onChange(of: worldTrackingLimitations) {
            if worldTrackingLimitations.contains(.translation) {
                // Rearrange content when anchored positions are unavailable.
            }
        }
    }
}

12:51 - Hands prediction

// Hands prediction

func submitFrame(_ frame: LayerRenderer.Frame) {
    ...

    guard let drawable = frame.queryDrawable() else { return }

    // Get the trackable anchor time to target.
    let trackableAnchorTime = drawable.frameTiming.trackableAnchorTime

    // Convert the timestamp into units of seconds.
let anchorPredictionTime = LayerRenderer.Clock.Instant.epoch.duration(to:
    trackableAnchorTime).timeInterval  

    // Predict hand anchors for the time that provides best content registration.
    let (leftHand, rightHand) = handTracking.handAnchors(at: anchorPredictionTime)
    
    ...
}