Program.cs

using StereoKit;
using StereoKit.Framework;
using System;

namespace PassthroughDotNet
{
    internal class Program
    {
        static void Main(string[] args)
        {
            PassthroughFBExt stepper = SK.AddStepper<PassthroughFBExt>();

            // Initialize StereoKit
            SKSettings settings = new SKSettings
            {
                appName = "PassthroughDotNet",
                assetsFolder = "Assets",
            };
            if (!SK.Initialize(settings))
                Environment.Exit(1);


            // Create assets used by the app
            Pose cubePose = new Pose(0, 0, -0.5f, Quat.Identity);
            Model cube = Model.FromMesh(
                Mesh.GenerateRoundedCube(Vec3.One * 0.1f, 0.02f),
                Default.MaterialUI);

            Matrix floorTransform = Matrix.TS(0, -1.5f, 0, new Vec3(30, 0.1f, 30));
            Material floorMaterial = new Material(Shader.FromFile("floor.hlsl"));
            floorMaterial.Transparency = Transparency.Blend;

            Pose windowPose = new Pose(-0.5f, 0, -0.3f, Quat.LookDir(1, 0, 1));


            // Core application loop
            while (SK.Step(() =>
            {
                if (SK.System.displayType == Display.Opaque)
                    Default.MeshCube.Draw(floorMaterial, floorTransform);

                UI.Handle("Cube", ref cubePose, cube.Bounds);
                cube.Draw(cubePose.ToMatrix());

                // Passthrough menu
                UI.WindowBegin("Passthrough Menu", ref windowPose);
                if (stepper.Available)
                {

                    if (UI.Button("toggle"))
                        stepper.Enabled = !stepper.Enabled;
                    
                    UI.Label($"Passthrough is {(stepper.Enabled ? "ON" : "OFF")}");
                }
                else
                {
                    UI.Label("Passthrough is not available :(");
                }
                UI.WindowEnd();

            })) ;
            SK.Shutdown();
        }
    }
}