// from biojava structure, convert to own user model
  public void createUserModel(Structure struc) {
    // read default MMFFtypes for atoms

    if (modelList == null) modelList = new ArrayList<Model>();
    Model model = null;
    for (int i = 0; i < struc.nrModels(); i++) {
      // for each model, create and add to model list
      model = new Model();
      model.setModelName("Model" + (i + 1));
      model.setMolecule(struc.getModel(i)); // set the model
      modelList.add(model);
    }
  }