code: function getAframeElementsFromSceneStructure(sceneStructure, parent) {
    var collection = parent ? null : [] // use collection or parent
    sceneStructure.forEach(function(element3d) {
      // check if type is supported in aframe
      if (validTypes.indexOf(element3d.type) > -1) {
        // get html attributes from element3d objects
        var el = addEntity({
          attributes: getAttributes(element3d),
          parent: parent
        })
        // the level scene might be baked
        if (element3d.type === 'level') {
          createBakedElement(el, element3d)
        }
        // recursively proceed through sceneStructure
        if (element3d.children && element3d.children.length) getAframeElementsFromSceneStructure(element3d.children, el)
        if (collection) collection.push(el)
      }
    })
  
    return collection
  }
docs: recursive parsing through sceneStructre