func receivedData(_ data: Data, from peer: MCPeerID) {
        if let unarchived = try? NSKeyedUnarchiver.unarchivedObject(of: ARWorldMap.classForKeyedArchiver()!, from: data), let worldMap = unarchived as? ARWorldMap {
            // Run the session with the received world map.
            let configuration = ARWorldTrackingConfiguration()
            configuration.planeDetection = .horizontal
            configuration.initialWorldMap = worldMap
            sceneView.session.run(configuration, options: [.resetTracking, .removeExistingAnchors])
            mapProvider = peer
        }
}