Method LoadMesh

src/gui/frame.cpp:2523–2596

// ---------------------------------------------------------------------

bool MyFrame::LoadMesh(const wxFileName& mesh_filename, vtkUnstructuredGrid* ug)
{
    bool all_ok = true;
    vtkObject::GlobalWarningDisplayOn(); // handling errors in this section
    try
    {
        if (mesh_filename.GetExt().Lower()==_T("vtp"))
        {
            vtkSmartPointer<vtkXMLPolyDataReader> vtp_reader = vtkSmartPointer<vtkXMLPolyDataReader>::New();
            vtp_reader->ReadFromInputStringOn();
            vtp_reader->SetInputString(ReadEntireFile(mesh_filename).ToStdString());
            vtp_reader->AddObserver(vtkCommand::ErrorEvent, vtkSmartPointer<ThrowOnErrorObserver>::New());
            vtp_reader->Update();
            ug->SetPoints(vtp_reader->GetOutput()->GetPoints());
            ug->SetCells(VTK_POLYGON, vtp_reader->GetOutput()->GetPolys());
        }
        else if (mesh_filename.GetExt().Lower()==_T("vtu"))
        {
            vtkSmartPointer<vtkXMLUnstructuredGridReader> vtu_reader = vtkSmartPointer<vtkXMLUnstructuredGridReader>::New();
            vtu_reader->ReadFromInputStringOn();
            vtu_reader->SetInputString(ReadEntireFile(mesh_filename).ToStdString());
            vtu_reader->AddObserver(vtkCommand::ErrorEvent, vtkSmartPointer<ThrowOnErrorObserver>::New());
            vtu_reader->Update();
            ug->DeepCopy(vtu_reader->GetOutput());
        }
        else if (mesh_filename.GetExt().Lower() ==_T("obj"))
        {
            wxString source_filename(mesh_filename.GetFullPath());
            bool made_temp_file = false;
            if(strlen(mesh_filename.GetFullPath().mb_str())==0) {
                // unicode characters in path, copy to temp file
                const wxString temp_name = wxFileName::CreateTempFileName("");
                if (wxCopyFile(mesh_filename.GetFullPath(), temp_name)) {
                    source_filename = temp_name;
                    made_temp_file = true;
                }
            }
            {
                // temporarily turn off internationalisation, to avoid string-to-float conversion issues
                char* old_locale = setlocale(LC_NUMERIC, "C");

                vtkSmartPointer<vtkOBJReader> obj_reader = vtkSmartPointer<vtkOBJReader>::New();
                obj_reader->SetFileName(source_filename.mb_str());
                obj_reader->AddObserver(vtkCommand::ErrorEvent, vtkSmartPointer<ThrowOnErrorObserver>::New());
                obj_reader->Update();

                ug->SetPoints(obj_reader->GetOutput()->GetPoints());
                ug->SetCells(VTK_POLYGON, obj_reader->GetOutput()->GetPolys());

                // restore the old locale
                setlocale(LC_NUMERIC, old_locale);
            }
            if (made_temp_file) {
                wxRemoveFile(source_filename);
            }
        }
        else
        {