Add demo app for various nodes/types and node/scene configurations.

Node Demos/ARCLViewController+SpriteKitNodes.swift

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+//
+//  ARCLViewController+SpriteKitNodes.swift
+//  Node Demos
+//
+//  Created by Hal Mueller on 10/7/19.
+//  Copyright © 2019 Project Dent. All rights reserved.
+//
+
+import ARCL
+import ARKit
+import MapKit
+import SceneKit
+import UIKit
+
+extension ARCLViewController {
+
+    /// Some experiments with getting SpriteKit scenes visible in ARCL. Work in progress.
+    func addSpriteKitNodes() {
+        guard let currentLocation = sceneLocationView?.sceneLocationManager.currentLocation else {
+            DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) { [weak self] in
+                self?.addSpriteKitNodes()
+            }
+            return
+        }
+
+        // Copy the current location because it's a reference type. Necessary?
+        let referenceLocation = CLLocation(coordinate:currentLocation.coordinate,
+                                           altitude: currentLocation.altitude)
+
+        // Put a label at the origin.
+        let north10Meterslabel = UILabel.largeLabel(text: "North 10 meters")
+        north10Meterslabel.backgroundColor = .systemTeal
+        let north10MetersLocation = referenceLocation.translatedLocation(with: LocationTranslation(latitudeTranslation: 10.0, longitudeTranslation: 0.0, altitudeTranslation: 0.0))
+        let north10MetersLabelNode = LocationAnnotationNode(location: north10MetersLocation, view: north10Meterslabel)
+        addScenewideNodeSettings(north10MetersLabelNode)
+        sceneLocationView?.addLocationNodeWithConfirmedLocation(locationNode: north10MetersLabelNode)
+
+        let south10Meterslabel = UILabel.largeLabel(text: "South 10 meters")
+        south10Meterslabel.backgroundColor = .systemPurple
+        let south10MetersLocation = referenceLocation.translatedLocation(with: LocationTranslation(latitudeTranslation: -10.0, longitudeTranslation: 0.0, altitudeTranslation: 0.0))
+        let south10MetersLabelNode = LocationAnnotationNode(location: south10MetersLocation, view: south10Meterslabel)
+        addScenewideNodeSettings(south10MetersLabelNode)
+        sceneLocationView?.addLocationNodeWithConfirmedLocation(locationNode: south10MetersLabelNode)
+
+        let east10MetersLocation = referenceLocation.translatedLocation(with: LocationTranslation(latitudeTranslation: 0.0, longitudeTranslation: 10.0, altitudeTranslation: 0.0))
+        let east10MetersLabelNode = LocationNode(location: east10MetersLocation)
+        addScenewideNodeSettings(east10MetersLabelNode)
+        sceneLocationView?.addLocationNodeWithConfirmedLocation(locationNode: east10MetersLabelNode)
+
+        //SKScene to hold 2D elements that get put onto a plane, then added to the SCNScene
+        let skScene = SKScene(size:CGSize(width: 500, height: 52  ))
+        skScene.backgroundColor = SKColor(white:0,alpha:0)
+
+        //create red box around the SKScene
+        let shape = SKShapeNode(rect: CGRect(x: 0, y: 0, width: skScene.frame.size.width, height: skScene.frame.size.height))
+        shape.strokeColor = SKColor.red
+        shape.lineWidth = 1
+        skScene.addChild(shape)
+
+        //the label we can update anytime we want
+        let label = SKLabelNode(fontNamed:"Menlo-Bold")
+        label.fontSize = 48
+        label.horizontalAlignmentMode = .left
+        label.verticalAlignmentMode = .center
+        label.position = CGPoint(x:0,y:skScene.frame.size.height/2)
+        label.text = "HELLO WORLD!"
+        skScene.addChild(label)
+
+        //create a plane to put the skScene on
+        let plane = SCNPlane(width:5,height:0.5)
+        let material = SCNMaterial()
+        material.lightingModel = SCNMaterial.LightingModel.constant
+        material.isDoubleSided = true
+        material.diffuse.contents = skScene
+        plane.materials = [material]
+
+        //Add plane to a node, and node to the SCNScene
+        let hudNode = SCNNode(geometry: plane)
+        hudNode.name = "HUD"
+        hudNode.rotation = SCNVector4(x: 1, y: 0, z: 0, w: 3.14159265)
+        hudNode.position = SCNVector3(x:0, y: 1.5, z: 1)
+        let billboardConstraint = SCNBillboardConstraint()
+        billboardConstraint.freeAxes = SCNBillboardAxis.Y
+        hudNode.constraints = [billboardConstraint]
+        east10MetersLabelNode.addChildNode(hudNode)
+
+  /*      SKSpriteNode *someSKSpriteNode;
+
+        // initialize your SKSpriteNode and set it up..
+
+        SKScene *tvSKScene = [SKScene sceneWithSize:CGSizeMake(100, 100)];
+        tvSKScene.anchorPoint = CGPointMake(0.5, 0.5);
+        [tvSKScene addChild:someSKSpriteNode];
+
+        // use spritekit scene as plane's material
+
+        SCNMaterial *materialProperty = [SCNMaterial material];
+        materialProperty.diffuse.contents = tvSKScene;
+
+        // this will likely change to whereever you want to show this scene.
+        SCNVector3 tvLocationCoordinates = SCNVector3Make(0, 0, 0);
+
+        SCNPlane *scnPlane = [SCNPlane planeWithWidth:100.0 height:100.0];
+        SCNNode *scnNode = [SCNNode nodeWithGeometry:scnPlane];
+        scnNode.geometry.firstMaterial = materialProperty;
+        scnNode.position = tvLocationCoordinates;
+
+        // Assume we have a SCNCamera and SCNNode set up already.
+
+        SCNLookAtConstraint *constraint = [SCNLookAtConstraint lookAtConstraintWithTarget:cameraNode];
+        constraint.gimbalLockEnabled = NO;
+        scnNode.constraints = @[constraint];
+
+        // Assume we have a SCNView *sceneView set up already.
+        [sceneView.scene.rootNode addChildNode:scnNode];
+*/
+    }
+}