for(it=output->begin(); it!=output->end(); ++it) {
std::cout << "========================================" << std::endl;
(*it)->PrintSelf(std::cout, vtkIndent(2));
for(it=output->begin(); it!=output->end(); ++it) {
std::cout << "========================================" << std::endl;
(*it)->PrintSelf(std::cout, vtkIndent(2));