parseSkeletons method
      
dynamic
parseSkeletons(
    
    
- dynamic json,
 - dynamic object
 
Implementation
parseSkeletons(json, object) {
  final skeletons = {};
  final Map<String, Bone?> bones = {};
  // generate bone lookup table
  object.traverse((child) {
    if (child is Bone) bones[child.uuid] = child;
  });
  // create skeletons
  if (json != null) {
    for (int i = 0, l = json.length; i < l; i++) {
      final skeleton = Skeleton().fromJson(json[i], bones);
      skeletons[skeleton.uuid] = skeleton;
    }
  }
  return skeletons;
}