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<!DOCTYPE html>
<html>
<head>
    <title>DNA Sequence</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://cdn.babylonjs.com/babylon.js"></script>
    <script src="https://cdn.babylonjs.com/loaders/babylonjs.loaders.min.js"></script>
</head>
<body>
    <canvas id="renderCanvas"></canvas>
    <script>
        var canvas = document.getElementById("renderCanvas");
        var engine = new BABYLON.Engine(canvas, true);

        var createScene = function () {
            var scene = new BABYLON.Scene(engine);
            var camera = new BABYLON.ArcRotateCamera("Camera", -Math.PI / 2, Math.PI / 2, 10, BABYLON.Vector3.Zero(), scene);
            camera.attachControl(canvas, true);

            // Create a DNA strand
            var dnaStrand = BABYLON.MeshBuilder.CreateTube("dnaStrand", {
                path: [
                    new BABYLON.Vector3(0, 0, 0),
                    new BABYLON.Vector3(0, 2, 0),
                    new BABYLON.Vector3(2, 2, 0),
                    new BABYLON.Vector3(2, 0, 0),
                    new BABYLON.Vector3(2, -2, 0),
                    new BABYLON.Vector3(0, -2, 0),
                    new BABYLON.Vector3(0, 0, 0)
                ],
                radiusFunction: function(i) {
                    return 0.1 + Math.abs(2 * Math.sin(i * 10));
                },
                tessellation: 128,
                updatable: true
            }, scene);

            // Create the material for the DNA strand
            var dnaMaterial = new BABYLON.StandardMaterial("dnaMaterial", scene);
            dnaMaterial.emissiveColor = new BABYLON.Color3(0.1, 0.1, 0.1);
            dnaMaterial.specularColor = new BABYLON.Color3(0.2, 0.2, 0.2);

            // Apply the material to the DNA strand
            dnaStrand.material = dnaMaterial;

            // Add some lights to the scene
            var light1 = new BABYLON.PointLight("light1", new BABYLON.Vector3(5, 10, 5), scene);
            var light2 = new BABYLON.PointLight("light2", new BABYLON.Vector3(-5, -10, -5), scene);

            return scene;
        }

        var scene = createScene();

        engine.runRenderLoop(function () {
            scene.render();
        });

        window.addEventListener("resize", function () {
            engine.resize();
        });
    </script>
</body>
</html>