message: demo: Register a stub for KHR_quantized_geometry
  Without this, Babylon.JS refuses to load quantized files.
diff: var canvas = document.getElementById("renderCanvas");
  BABYLON.GLTF2.GLTFLoader.RegisterExtension("MESHOPT_compression", (loader) => new MESHOPT_compression(loader, MeshoptDecoder));
  + BABYLON.GLTF2.GLTFLoader.RegisterExtension("KHR_quantized_geometry", (loader) => ({ name: "KHR_quantized_geometry", enabled: true }));
  var createScene = function () {
  var scene = new BABYLON.Scene(engine);
  