toJson method
Implementation
@override
List<dynamic> toJson(ValueNotifier<Matrix4> matrix) {
  final list = List<double>.filled(16, 0.0);
  matrix.value.copyIntoArray(list);
  return list;
}@override
List<dynamic> toJson(ValueNotifier<Matrix4> matrix) {
  final list = List<double>.filled(16, 0.0);
  matrix.value.copyIntoArray(list);
  return list;
}