For your convenience, this package includes a ThreeJS
LoadingManager that you can use to display a progress bar while your experience loads (should you wish to).
LoadingManager is constructed like this:
let manager = new ZapparThree.LoadingManager();
Then make sure to pass the
manager into any three.js loaders you might use, e.g:
LoadingManager will automatically handle the showing and hiding of the screen during the loading process.