How to draw line in arkit based on CLLocation in iOS Swift?

I try ar navigation for outdoor. I have used mapbox for ar navigation and used mapboxarkit and mapboxDirection cocopods.

The nodes are shown as path. I can able show path as dotted shpere or plane but not able show as line. Here is my out put screenshotshere is the node, which i have tried to show as a line breaking and tried to adjuct scnbox in straight to show as line.

Result which i have expected I want ar line like this.

Here is the code i have tried so far - Here is the code to add ar annotation and ar line.

   if let route = routes?.first, let leg = route.legs.first {
            var polyline = [CLLocationCoordinate2D]()

            // Add an AR node and map view annotation for every defined "step" in the route
            for step in leg.steps {
                let coordinate = step.coordinates!.first!
                polyline.append(coordinate)
                let stepLocation = CLLocation(latitude: coordinate.latitude, longitude: coordinate.longitude)

                // Update feature collection for map view
                self.updateShapeCollectionFeature(&self.waypointShapeCollectionFeature, with: stepLocation, typeKey: "waypoint-type", typeAttribute: "big")

                // Add an AR node
                let annotation = Annotation(location: stepLocation, calloutImage: self.calloutImage(for: step.description))
                annotationsToAdd.append(annotation)
            }

            let metersPerNode: CLLocationDistance = 1
            let turfPolyline = Polyline(polyline)



            // Walk the route line and add a small AR node and map view annotation every metersPerNode
            for i in stride(from: metersPerNode, to: turfPolyline.distance() - metersPerNode, by: metersPerNode) {

                // Use Turf to find the coordinate of each incremented distance along the polyline
                if let nextCoordinate = turfPolyline.coordinateFromStart(distance: i) {
                    let interpolatedStepLocation = CLLocation(latitude: nextCoordinate.latitude, longitude: nextCoordinate.longitude)

                    // Update feature collection for map view
                    self.updateShapeCollectionFeature(&self.waypointShapeCollectionFeature, with: interpolatedStepLocation, typeKey: "waypoint-type", typeAttribute: "small")

                    // Add an AR node
                    let annotation = Annotation(location: interpolatedStepLocation, calloutImage: nil)
                    annotationsToAdd.append(annotation)
                }

Here is the code for create scnplane:

   func createLightBulbNode() -> SCNNode {

    let lightBulbNode = collada2SCNNode(filepath: "art.scnassets/cubeSolid.dae")


    lightBulbNode.position = SCNVector3(0, -0.5, 0)

    return lightBulbNode
}

func collada2SCNNode(filepath:String) -> SCNNode {
    let node = SCNNode()
    let scene = SCNScene(named: filepath, inDirectory: nil, options: [SCNSceneSource.LoadingOption.animationImportPolicy: SCNSceneSource.AnimationImportPolicy.doNotPlay])
    let nodeArray = scene!.rootNode.childNodes
    for childNode in nodeArray {
        node.addChildNode(childNode as SCNNode)
    }
    return node
  }

}

 func node(for annotation: Annotation) -> SCNNode? {

    if annotation.calloutImage == nil {
        // Comment `createLightBulbNode` and add `return nil` to use the default node
        return createLightBulbNode()
    } else {
        let firstColor = UIColor(red: 0.0, green: 99/255.0, blue: 175/255.0, alpha: 1.0)
        return createSphereNode(with: 0.5, firstColor: firstColor, secondColor: UIColor.green)
    }
}

Any help much appreciated pls...

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