Babylon.js/Tools/BuildOurOwnBabylonJS/BuildOurOwnBabylonJSWinJSApp/pages/babylonScene/babylonScene.js

var engine;
(function () {
    "use strict";

    WinJS.UI.Pages.define("/pages/babylonScene/babylonScene.html", {
        // This function is called whenever a user navigates to this page. It
        // populates the page elements with the app's data.
        ready: function (element, options) {
            var canvas = element.querySelector("#babylonCanvas");
            engine = new BABYLON.Engine(canvas, true);
            var container = canvas.parentElement;

            var loadingBack = element.querySelector("#loadingBack");
            var loadingText = element.querySelector("#loadingText");

            loadingBack.className = "";
            loadingText.className = "";
            loadingText.innerHTML = "Loading, please wait...";

            BABYLON.SceneLoader.Load(options.babylonFolder + "/", options.babylonFile, engine, function (scene) {
                scene.executeWhenReady(function () { 
                    if (!scene.activeCamera) {
                        scene.activeCamera = new BABYLON.ArcRotateCamera("DefaultCamera", -Math.PI / 2, Math.PI / 2, 10, new BABYLON.Vector3.Zero(), scene);
                        scene.activeCamera.zoomOn();
                    }
                    if (scene.lights.length == 0) {
                        var light = new BABYLON.HemisphericLight("Default light", new BABYLON.Vector3(0, 1, 0), scene);
                    }
                    scene.activeCamera.attachControl(canvas);

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

                    loadingBack.className = "loadingBack";
                    loadingText.className = "loadingText";
                });
            }, function (evt) {
                if (evt.lengthComputable) {
                    loadingText.innerHTML = "Loading, please wait..." + (evt.loaded * 100 / evt.total).toFixed() + "%";
                } else {
                    dlCount = evt.loaded / (1024 * 1024);
                    loadingText.innerHTML = "Loading, please wait..." + Math.floor(dlCount * 100.0) / 100.0 + " MB already loaded.";
                }
            });

        },
        unload: function () {
            engine.stopRenderLoop();
            engine.dispose();
            engine = null;
        }
    });
})();