anchor.diff:  import 'package:orange/orange.dart';
   import 'package:vector_math/vector_math.dart';
  +import 'dart:html';
   
   
   
  
positive.code:     light1.direction = new Vector3(-1.0, -1.0, 0.0).normalize();
      add(light1);
    }
    
    @override
    void enterFrame(num elapsed, num interval) {
    }
  
negative.code: 
    TestGLTFScene(Camera camera) : super(camera);
  
    List _meshes = [];  
    
    @override
    void enter() {
  
      //    camera.position.setValues(-20.0, 2600.0, 1000.0);
      camera.position.setValues(100.0, 100.0, 300.0);
      camera.lookAt(new Vector3.zero());
  
      var urls = ["../models/duck/duck.json", "../models/SuperMurdoch/SuperMurdoch.json", "../models/rambler/rambler.json", "../models/wine/wine.json"];
  
      var selector = new SelectElement();
      urls.forEach((u) {
        var option = new OptionElement(data: u.split("/").last, value: u);
        selector.children.add(option);
        
      });
      selector.onChange.listen((e) {
        var opt = selector.options[selector.selectedIndex];
        _loadModel(opt.value);
      });
      querySelector("#controllers").children.add(selector);
  
      _loadModel(urls.first);
  
      var light0 = new PointLight(0xffffff);
      light0.intensity = 0.9;
  