Update app.py

app.py

@@ -795,15 +795,11 @@ css = """
 """
 
 head = """
+    <script src="https://cdn.babylonjs.com/babylon.min.js"></script>
     <script src="https://code.jquery.com/pep/0.4.2/pep.js"></script>
     <script src="EditControl.js"></script>
     <script>
-    var iv = setInterval(function(){
-      if (BABYLON) {
         window.EditControl = EditControl;
-        clearInterval(iv);
-      }
-    }, 40);
     </script>
 """