So if you create a webscene and then set it on the view, the api internally calls the `load` method once it's set on the map property of the view. If then you call `webscene.when` that should run the callback you're passing exactly when the load method resolves.
const webscene = new WebScene(...);
const view = new SceneView({
...
map: webscene
});
webscene.when(() => {
// now you have access to layers, ground and basemap
});
The load method however, doesn't load all the loadable resources/sublayers etc. Slides might also not be ready depending on how heavy your scene is. So I'd advise you to use `loadAll()` to wait for all the resources like John showed in his example:
map.loadAll().then(() => {
// the scene is now fully loaded and you can create the view, the slides, set properties on layers etc.
// you don't need map.when() anymore
// you can use view.when() if you want to make sure that the view is ready. In case you make changes before this point, they might get overriden when the map is set on the view.
})
.catch((err) => console.log(err));
