List<vtkProp> toDelete = new ArrayList<vtkProp>();
for (vtkProp prop : nodeToActor.getValues((E)node)) {
if (prop.GetVTKId() != 0) {
List<vtkProp> toDelete = new ArrayList<vtkProp>();
for (vtkProp prop : nodeToActor.getValues((E)node)) {
if (prop.GetVTKId() != 0) {