index.html.js

//L.80行付近
 <script type="text/javascript">var pagetype = "game", defaultmap = "JapanOtakuCity.babylon", antialias = true, adaptive = true, wasm = true, offline=false, folder = "scenes/", title = "BJS_Exporter";</script>

//最終行付近
if (BABYLON.SceneManager && BABYLON.SceneManager.RegisterLoader) {
            BABYLON.SceneManager.RegisterLoader(defaultSceneLoader);
        }
        window.addEventListener("DOMContentLoaded", () => { defaultSceneLoader(folder, defaultmap); });

//L200行付近
 var defaultSceneLoader = (root, name) => {
            scene = null;
            loaded = false;
            showSceneLoader();
            executeSceneLoader(root, name);            
        };


L130付近
var executeSceneLoader = (root, name) => {
            progressSceneLoader();
            BABYLON.SceneLoader.Load(root, name, engine, (newscene) => {
                scene = newscene;
//省略