Node animation

Description

We can animate nodes in a scene using SCNAction. A number of properties can be animated such as size, position and opacity.

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
            };

            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 size = 0.05f;

            var torusNode = new TorusNode(size, UIColor.Orange);

            var rorateAction = SCNAction.RotateBy((float)(Math.PI), 0, 0, 5.0);
            var repeatForever = SCNAction.RepeatActionForever(rorateAction);
            torusNode.RunAction(repeatForever);

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

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

            this.sceneView.Session.Pause();
        }

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

    public class TorusNode : SCNNode
    {
        public TorusNode(float size, UIColor color)
        {
            var rootNode = new SCNNode
            {
                Geometry = CreateGeometry(size, color)
            };

            AddChildNode(rootNode);
        }

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

            var geometry = SCNTorus.Create(size / 2, size / 6);
            geometry.Materials = new[] { material };

            return geometry;
        }
    }
}