Babylon.js/Playground/scripts/height Map.js

var createScene = function () {
    var scene = new BABYLON.Scene(engine);

    // Light
    var spot = new BABYLON.PointLight("spot", new BABYLON.Vector3(0, 30, 10), scene);
    spot.diffuse = new BABYLON.Color3(1, 1, 1);
    spot.specular = new BABYLON.Color3(0, 0, 0);

    // Camera
    var camera = new BABYLON.ArcRotateCamera("Camera", 0, 0.8, 100, BABYLON.Vector3.Zero(), scene);
    camera.lowerBetaLimit = 0.1;
    camera.upperBetaLimit = (Math.PI / 2) * 0.9;
    camera.lowerRadiusLimit = 30;
    camera.upperRadiusLimit = 150;
    camera.attachControl(canvas, true);

    // Ground
    var groundMaterial = new BABYLON.StandardMaterial("ground", scene);
    groundMaterial.diffuseTexture = new BABYLON.Texture("textures/earth.jpg", scene);

    var ground = BABYLON.Mesh.CreateGroundFromHeightMap("ground", "textures/worldHeightMap.jpg", 200, 200, 250, 0, 10, scene, false);
    ground.material = groundMaterial;

    //Sphere to see the light's position
    var sun = BABYLON.Mesh.CreateSphere("sun", 10, 4, scene);
    sun.material = new BABYLON.StandardMaterial("sun", scene);
    sun.material.emissiveColor = new BABYLON.Color3(1, 1, 0);

    // Skybox
    var skybox = BABYLON.Mesh.CreateBox("skyBox", 800.0, scene);
    var skyboxMaterial = new BABYLON.StandardMaterial("skyBox", scene);
    skyboxMaterial.backFaceCulling = false;
    skyboxMaterial.reflectionTexture = new BABYLON.CubeTexture("textures/skybox", scene);
    skyboxMaterial.reflectionTexture.coordinatesMode = BABYLON.Texture.SKYBOX_MODE;
    skyboxMaterial.diffuseColor = new BABYLON.Color3(0, 0, 0);
    skyboxMaterial.specularColor = new BABYLON.Color3(0, 0, 0);
    skyboxMaterial.disableLighting = true;
    skybox.material = skyboxMaterial;

    //Sun animation
    scene.registerBeforeRender(function () {
        sun.position = spot.position;
        spot.position.x -= 0.5;
        if (spot.position.x < -90)
            spot.position.x = 100;
    });

    return scene;
}