Angle nodes with rotation

Description

We will learn how to angle nodes we have placed in the scene.

Video

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Code

using ARKit;
using SceneKit;
using System;
using UIKit;

namespace XamarinArkitSample
{
    public partial class ViewController : UIViewController
    {
        private readonly ARSCNView sceneView;

        public ViewController(IntPtr handle) : base(handle)
        {
            this.sceneView = new ARSCNView
            {
                AutoenablesDefaultLighting = true,
                DebugOptions = ARSCNDebugOptions.ShowWorldOrigin
            };

            this.View.AddSubview(this.sceneView);
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            this.sceneView.Frame = this.View.Frame;
        }

        public override void ViewDidAppear(bool animated)
        {
            base.ViewDidAppear(animated);

            this.sceneView.Session.Run(new ARWorldTrackingConfiguration
            {
                AutoFocusEnabled = true,
                PlaneDetection = ARPlaneDetection.Horizontal,
                LightEstimationEnabled = true,
                WorldAlignment = ARWorldAlignment.GravityAndHeading
            }, ARSessionRunOptions.ResetTracking | ARSessionRunOptions.RemoveExistingAnchors);

            var width = 0.1f;
            var length = 0.1f;

            var planeNode = new PlaneNode(width, length, UIColor.Orange);

            // Lesson: Rotate node
            planeNode.Rotation = new SCNVector4(0, 0, 1, ConvertDegreesToRadians(45));

            this.sceneView.Scene.RootNode.AddChildNode(planeNode);
        }

        public float ConvertDegreesToRadians(float angle)
        {
            return (float)(Math.PI / 180) * angle;
        }

        public override void ViewDidDisappear(bool animated)
        {
            base.ViewDidDisappear(animated);

            this.sceneView.Session.Pause();
        }

        public override void DidReceiveMemoryWarning()
        {
            base.DidReceiveMemoryWarning();
        }
    }

    public class PlaneNode : SCNNode
    {
        public PlaneNode(float width, float length, UIColor color)
        {
            var rootNode = new SCNNode
            {
                Geometry = CreateGeometry(width, length, color)
            };

            AddChildNode(rootNode);
        }

        private static SCNGeometry CreateGeometry(float width, float length, UIColor color)
        {
            var material = new SCNMaterial();
            material.Diffuse.Contents = color;
            material.DoubleSided = true;

            var geometry = SCNPlane.Create(width, length);            
            geometry.Materials = new[] { material };

            return geometry;
        }
    }
}