anchor.diff:  import 'dart:html';
   import 'dart:math' as Math;
  -import 'package:vector_math/vector_math.dart';
   import 'package:three/three.dart';
   import 'package:three/extras/controls/trackball_controls.dart';
   
  -  Element container;
  +Element container;
   
  -  OrthographicCamera camera;
  -  Scene scene;
  -  CanvasRenderer renderer;
  +PerspectiveCamera camera;
  +Scene scene;
  +WebGLRenderer renderer;
   
  -  TrackballControls controls;
  +TrackballControls controls;
   
   void main() {
     init();
  
positive.code: 
    // Pyramids
  
    geometry = new CylinderGeometry( 0, 10, 30, 4, 1 );
    material = new MeshLambertMaterial( color: 0xffffff, shading: FlatShading );
  
    var rnd = new Math.Random();
  
negative.code:                   ''';
    container.nodes.add( info );
  
    camera = new PerspectiveCamera( 60.0, window.innerWidth / window.innerHeight, 1.0, 1000.0 );
    camera.position.z = 500.0;
  
    controls = new TrackballControls( camera );
  