code: function (forceUpdateWorld) {
          if (this.autoUpdateLocalTransform) {
              this.updateLocalTransform();
          }
          else {
              // Transform is manually setted
              forceUpdateWorld = true;
          }
  
          if (forceUpdateWorld || this._needsUpdateWorldTransform) {
              this._updateWorldTransformTopDown();
              forceUpdateWorld = true;
              this._needsUpdateWorldTransform = false;
          }
  
          var children = this._children;
          for(var i = 0, len = children.length; i < len; i++) {
              children[i].update(forceUpdateWorld);
          }
      }
docs: Update local transform and world transform recursively
  @param {boolean} forceUpdateWorld