[bos #40653][CEA] New mesh import export formats with meshio.

doc/gui/input/importing_exporting_meshes.rst

@@ -5,6 +5,10 @@
 Importing and exporting meshes
 ******************************
 
+==============================
+File formats
+==============================
+
 In MESH there is a functionality allowing import/export of meshes in the following formats:
 
 * **MED**,
@@ -16,6 +20,52 @@ In MESH there is a functionality allowing import/export of meshes in the followi
 
 You can also export a group as a whole mesh.
 
+------------------------------
+Additional file formats with meshio
+------------------------------
+
+It is possible to use additional file formats using **meshio** library.
+However, there are some restrictions because of way it uses in Salome. The main points here are:
+
+* We use intermediate MED file to communicate between Salome and **meshio**.
+* Convertion to the target format performs **meshio convert** command, using given **MED** file.
+* Current **meshio** version doesn't work well with all tested file formats. 
+
+Anyway, you can try to import/export meshes with **meshio** using following formats:
+
+* Abaqus (*.inp)
+* ANSYS msh (*.msh)
+* AVS-UCD (*.avs)
+* CGNS (*.cgns)
+* DOLFIN XML (*.xml)
+* Exodus (*.e *.exo)
+* FLAC3D (*.f3grid)
+* Gmsh 2.2, 4.0, and 4.1 (*.msh)
+* H5M (*.h5m)
+* Kratos/MDPA (*.mdpa)
+* MED/Salome (*.med)
+* Medit (*.mesh *.meshb)
+* Nastran (*.bdf *fem *.nas)
+* Netgen(*.vol *.vol.gz)
+* OBJ (*.obj)
+* OFF (*.off)
+* PERMAS (*.post *.post.gz *.dato *.dato.gz)
+* PLY (*.ply)
+* STL (*.stl)
+* SU2 (*.su2)
+* SVG, 2D output only (*.svg)
+* Tecplot (*.dat)
+* TetGen (*.node *.ele)
+* UGRID (*.ugrid)
+* VTK (*.vtk)
+* VTU (*.vtu)
+* WKT, TIN (*.wkt)
+* XDMF (*.xdmf *.xmf)
+
+==============================
+Import
+==============================
+
 *To import a mesh:*
 
 #. From the **File** menu choose the **Import** item, from its sub-menu select the corresponding format (MED, UNV, STL, GMF and CGNS) of the file containing your mesh.
@@ -25,6 +75,10 @@ You can also export a group as a whole mesh.
 .. image:: ../images/meshimportmesh.png
 	:align: center
 
+==============================
+Export
+==============================
+
 *To export a mesh or a group:*
 
 #. Select the object you wish to export.

idl/SMESH_Gen.idl

@@ -294,6 +294,14 @@ module SMESH
                                     in boolean              theMakeRequiredGroups,
                                     out SMESH::ComputeError theError)
       raises ( SALOME::SALOME_Exception );
+
+    /*!
+     * Create a mesh and import data from any file supported by meshio library
+     */
+    mesh_array CreateMeshesFromMESHIO(in string theFileName,
+                                      out SMESH::DriverMED_ReadStatus theStatus)
+      raises (SALOME::SALOME_Exception);
+
     /*!
      * Create a dual mesh of a Tetrahedron mesh
      *  \param mesh - TetraHedron mesh to create dual from

idl/SMESH_Mesh.idl

@@ -712,6 +712,17 @@ module SMESH
                           in double             ZTolerance,
                           in boolean            saveNumbers) raises (SALOME::SALOME_Exception);
 
+    /*!
+     * Export a [part of] Mesh to a file with meshio library using an intermediate MED file
+     * @params
+     * - meshPart : a part of mesh to store
+     * - fileName : name of the MED file
+     * - selectedFilter : filter string selected by user in a file dialog.
+     */
+    void ExportPartToMESHIO(in SMESH_IDSource     meshPart,
+                            in string             fileName,
+                            in string             selectedFilter) raises (SALOME::SALOME_Exception);
+
     long long ExportPartToMEDCoupling( in SMESH_IDSource     meshPart,
                                        in boolean            auto_groups,
                                        in boolean            autoDimension,

src/SMESHGUI/CMakeLists.txt

@@ -161,6 +161,7 @@ SET(_moc_HEADERS
   SMESHGUI_InteractiveOp.h
   SMESHGUI_CreateDualMeshDlg.h
   SMESHGUI_CreateDualMeshOp.h
+  SMESHGUI_Meshio.h
 )
 
 # header files / no moc processing
@@ -290,6 +291,7 @@ SET(_other_SOURCES
   SMESHGUI_InteractiveOp.cxx
   SMESHGUI_CreateDualMeshDlg.cxx
   SMESHGUI_CreateDualMeshOp.cxx
+  SMESHGUI_Meshio.cxx
 )
 
 # sources / to compile

src/SMESHGUI/SMESHGUI.cxx

@@ -70,6 +70,7 @@
 #include "SMESHGUI_Measurements.h"
 #include "SMESHGUI_MergeDlg.h"
 #include "SMESHGUI_MeshInfo.h"
+#include "SMESHGUI_Meshio.h"
 #include "SMESHGUI_MeshOp.h"
 #include "SMESHGUI_MeshOrderOp.h"
 #include "SMESHGUI_MeshPatternDlg.h"
@@ -213,6 +214,7 @@ namespace
   void Control( int theCommandID );
 
   // Definitions
+
   //================================================================================
   /*!
    * \brief Reads meshes from file
@@ -251,6 +253,12 @@ namespace
       filter.append( QObject::tr( "GMF_ASCII_FILES_FILTER" ) + " (*.mesh)"  );
       filter.append( QObject::tr( "GMF_BINARY_FILES_FILTER") + " (*.meshb)" );
     }
+    else if (theCommandID == SMESHOp::OpImportMESHIO) {
+      if (!SMESHGUI_Meshio::IsMeshioInstalled())
+        return;
+
+      filter = SMESHGUI_Meshio::GetImportFileFilter();
+    }
 
     QString anInitialPath = "";
     if ( SUIT_FileDlg::getLastVisitedPath().isEmpty() )
@@ -366,9 +374,18 @@ namespace
               }
               break;
             }
+          case SMESHOp::OpImportMESHIO:
+            {
+              aMeshes = SMESHGUI_Meshio::ImportMesh(theComponentMesh, filename, errors);
+              break;
+            }
           }
         }
         catch ( const SALOME::SALOME_Exception& S_ex ) {
+          const QString exText(S_ex.details.text);
+          if (exText.startsWith("MESHIO"))
+            errors.append('\n' + exText);
+          else
             errors.append( QString( "%1 :\n\t%2" ).arg( filename ).
                           arg( QObject::tr( "SMESH_ERR_UNKNOWN_IMPORT_ERROR" ) ) );
         }
@@ -440,8 +457,14 @@ namespace
                          theCommandID == SMESHOp::OpPopupExportCGNS );
     const bool isGMF = ( theCommandID == SMESHOp::OpExportGMF ||
                          theCommandID == SMESHOp::OpPopupExportGMF );
+    const bool isMESHIO = (theCommandID == SMESHOp::OpExportMESHIO);
 
-    const bool multiMeshSupported = ( isMED || isCGNS ); // file can hold several meshes
+    if (isMESHIO && !SMESHGUI_Meshio::IsMeshioInstalled())
+    {
+      return;
+    }
+
+    const bool multiMeshSupported = isMED || isCGNS || isMESHIO; // file can hold several meshes
     if ( selected.Extent() == 0 || ( selected.Extent() > 1 && !multiMeshSupported ))
       return;
     SUIT_ResourceMgr* resMgr = SUIT_Session::session()->resourceMgr();
@@ -517,7 +540,7 @@ namespace
     SMESH::SMESH_Mesh_var            aMesh = aMeshOrGroup->GetMesh();
     QString                      aMeshName = (*aMeshIter).second;
 
-    if ( isMED || isCGNS ) // formats where group names must be unique
+    if (isMED || isCGNS || isMESHIO) // formats where group names must be unique
     {
       // check for equal group names within each mesh
       for( aMeshIter = aMeshList.begin(); aMeshIter != aMeshList.end(); aMeshIter++ ) {
@@ -627,6 +650,7 @@ namespace
     // Get parameters of export operation
 
     QString aFilename;
+    QString aSelectedFilter; // for meshio to get a filter selected by user
     int aFormat =-1;         // for MED version used for write
     bool isOkToWrite = true; // to check MED file version compatibility before adding a mesh in an existing file
 
@@ -872,6 +896,14 @@ namespace
         delete zTolWdg;
       delete fd;
     }
+    else if (isMESHIO)
+    {
+      if (SMESHGUI_Meshio::CheckMeshCount(aMeshList))
+      {
+        aFilename = SMESHGUI_Meshio::GetFileName(aSelectedFilter);
+        MESSAGE("aSelectedFilter: " << aSelectedFilter.toStdString());
+      }
+    }
     else
     {
       return;
@@ -954,16 +986,28 @@ namespace
           toCreateGroups = true;
           aMesh->ExportGMF( aMeshOrGroup, aFilename.toUtf8().data(), toCreateGroups );
         }
+        else if (isMESHIO)
+        {
+          SMESHGUI_Meshio::ExportMesh(aMeshList, aFilename, aSelectedFilter);
+        }
       }
       catch (const SALOME::SALOME_Exception& S_ex)
       {
         wc.suspend();
+        const QString exText(S_ex.details.text);
+
         if ( S_ex.details.type == SALOME::COMM && // communicate about too large mesh
              strncmp( "format=", S_ex.details.sourceFile.in(), 7 ) == 0 )
 
           SUIT_MessageBox::critical(SMESHGUI::desktop(),
                                     QObject::tr("SMESH_WRN_WARNING"),
                                     QObject::tr(S_ex.details.text.in() ));
+        else if (exText.startsWith("MESHIO"))
+        {
+          SUIT_MessageBox::warning(SMESHGUI::desktop(),
+                                   QObject::tr("SMESH_WRN_WARNING"),
+                                   QObject::tr("SMESH_EXPORT_FAILED_SHORT") + "\n\n" + exText);
+        }
         else
           SUIT_MessageBox::warning(SMESHGUI::desktop(),
                                    QObject::tr("SMESH_WRN_WARNING"),
@@ -2573,6 +2617,7 @@ bool SMESHGUI::OnGUIEvent( int theCommandID )
   case SMESHOp::OpImportSTL:
   case SMESHOp::OpImportCGNS:
   case SMESHOp::OpImportGMF:
+  case SMESHOp::OpImportMESHIO:
   case SMESHOp::OpPopupImportDAT:
   case SMESHOp::OpPopupImportUNV:
   case SMESHOp::OpPopupImportMED:
@@ -2609,6 +2654,7 @@ bool SMESHGUI::OnGUIEvent( int theCommandID )
   case SMESHOp::OpExportSTL:
   case SMESHOp::OpExportCGNS:
   case SMESHOp::OpExportGMF:
+  case SMESHOp::OpExportMESHIO:
   case SMESHOp::OpPopupExportDAT:
   case SMESHOp::OpPopupExportMED:
   case SMESHOp::OpPopupExportUNV:
@@ -4152,6 +4198,7 @@ void SMESHGUI::initialize( CAM_Application* app )
   createSMESHAction( SMESHOp::OpImportCGNS, "IMPORT_CGNS" );
 #endif
   createSMESHAction( SMESHOp::OpImportGMF,  "IMPORT_GMF"  );
+  createSMESHAction( SMESHOp::OpImportMESHIO,  "IMPORT_MESHIO" );
   createSMESHAction( SMESHOp::OpPopupImportUNV, "IMPORT_UNV");
   createSMESHAction( SMESHOp::OpPopupImportMED, "IMPORT_MED");
   createSMESHAction( SMESHOp::OpPopupImportSTL, "IMPORT_STL"  );
@@ -4168,6 +4215,7 @@ void SMESHGUI::initialize( CAM_Application* app )
   createSMESHAction( SMESHOp::OpExportCGNS, "CGNS");
 #endif
   createSMESHAction( SMESHOp::OpExportGMF,      "GMF" );
+  createSMESHAction( SMESHOp::OpExportMESHIO,   "EXPORT_MESHIO" );
   createSMESHAction( SMESHOp::OpPopupExportDAT, "DAT" );
   createSMESHAction( SMESHOp::OpPopupExportMED, "MED" );
   createSMESHAction( SMESHOp::OpPopupExportUNV, "UNV" );
@@ -4417,6 +4465,7 @@ void SMESHGUI::initialize( CAM_Application* app )
       transfId = createMenu( tr( "MEN_TRANSF" ), modifyId, 405 ),
       basicPropId = createMenu( tr( "MEN_BASIC_PROPERTIES" ), measureId, -1, 10 );
 
+  // Import menu
   //createMenu( SMESHOp::OpImportDAT, importId, -1 );
   createMenu( SMESHOp::OpImportUNV,  importId, -1 );
   createMenu( SMESHOp::OpImportMED,  importId, -1 );
@@ -4425,6 +4474,9 @@ void SMESHGUI::initialize( CAM_Application* app )
   createMenu( SMESHOp::OpImportCGNS, importId, -1 );
 #endif
   createMenu( SMESHOp::OpImportGMF,  importId, -1 );
+  createMenu( SMESHOp::OpImportMESHIO,  importId, -1 ); // formats supported by meshio lib
+
+  // Export menu
   createMenu( SMESHOp::OpExportDAT,  exportId, -1 );
   createMenu( SMESHOp::OpExportMED,  exportId, -1 );
   createMenu( SMESHOp::OpExportUNV,  exportId, -1 );
@@ -4433,6 +4485,7 @@ void SMESHGUI::initialize( CAM_Application* app )
   createMenu( SMESHOp::OpExportCGNS, exportId, -1 );
 #endif
   createMenu( SMESHOp::OpExportGMF,  exportId, -1 );
+  createMenu( SMESHOp::OpExportMESHIO,  exportId, -1 ); // formats supported by meshio lib
   createMenu( separator(), fileId, 10 );
 
   createMenu( SMESHOp::OpDelete, editId, -1 );
@@ -4854,6 +4907,7 @@ void SMESHGUI::initialize( CAM_Application* app )
 #endif
   createPopupItem( SMESHOp::OpPopupExportGMF,  OB, mesh_group, only_one_non_empty, anId );
   createPopupItem( SMESHOp::OpPopupExportDAT,  OB, mesh_group, only_one_non_empty, anId );
+  createPopupItem( SMESHOp::OpExportMESHIO,    OB, mesh_group, only_one_non_empty, anId );
 
   anId = popupMgr()->insert( tr( "MEN_IMPORT" ), -1, -1 );        // IMPORT submenu
   createPopupItem( SMESHOp::OpPopupImportMED,  OB, smesh, "", anId );

src/SMESHGUI/SMESHGUI_Meshio.cxx

@@ -0,0 +1,267 @@
+// Copyright (C) 2007-2024  CEA, EDF, OPEN CASCADE
+//
+// Copyright (C) 2003-2007  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
+// CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+//
+// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
+//
+
+// SMESH SMESHGUI : support of import / export with meshio library
+// File   : SMESHGUI_Meshio.h
+// Author : Konstantin Leontev, Open CASCADE S.A.S.
+//
+#include "SMESHGUI_Meshio.h"
+#include "SMESH_Meshio.h"
+
+// SMESH includes
+#include "SMESHGUI.h"
+#include "SMESHGUI_FieldSelectorWdg.h"
+
+// SALOME GUI includes
+#include <SUIT_Desktop.h>
+#include <SUIT_FileDlg.h>
+#include <SUIT_MessageBox.h>
+
+// SALOME KERNEL includes
+#include <utilities.h>
+
+// Qt
+#include <QStringList>
+
+
+/*!
+  Constructor
+*/
+SMESHGUI_Meshio::SMESHGUI_Meshio()
+{
+}
+
+/*!
+  Destructor
+*/
+SMESHGUI_Meshio::~SMESHGUI_Meshio()
+{
+}
+
+/*!
+  Check and warn about exporting many shapes 
+*/
+bool SMESHGUI_Meshio::CheckMeshCount(const meshList& aMeshList)
+{
+  if (aMeshList.size() == 1)
+  {
+    return true;
+  }
+  else if (!aMeshList.size())
+  {
+    // We shouldn't get here, but...
+    MESSAGE("Error: empty mesh list. Export canceled.");
+    return false;
+  }
+
+  const bool isOk = SUIT_MessageBox::warning(
+    SMESHGUI::desktop(),
+    QObject::tr("SMESH_WARNING"),
+    QObject::tr("SMESH_EXPORT_MESHIO_ONLY_MESH"),
+    SUIT_MessageBox::Yes |
+    SUIT_MessageBox::No,
+    SUIT_MessageBox::No) == SUIT_MessageBox::Yes;
+
+  return isOk;
+}
+
+/*!
+  Import mesh through an intermediate MED file
+*/
+SMESH::mesh_array_var SMESHGUI_Meshio::ImportMesh(
+  SMESH::SMESH_Gen_ptr theComponentMesh, const QString& filename, QStringList& errors)
+{
+  SMESH::DriverMED_ReadStatus res;
+  SMESH::mesh_array_var aMeshes = theComponentMesh->CreateMeshesFromMESHIO(filename.toUtf8().constData(), res);
+  if (res != SMESH::DRS_OK)
+  {
+    errors.append(QString("%1 :\n\t%2").arg(filename).arg(
+      QObject::tr(QString("SMESH_DRS_%1").arg(res).toLatin1().data())));
+  }
+
+  return aMeshes;
+}
+
+/*!
+  Returns a filter for Import File dialog
+*/
+const QStringList& SMESHGUI_Meshio::GetImportFileFilter()
+{
+  auto addAllFiles = []() -> QStringList
+  {
+    QStringList filter = GetExportFileFilter();
+
+    // Remove SVG because it works only for export
+    const int svgIndex = filter.indexOf(QRegExp("^SVG.+"));
+    if (svgIndex >= 0)
+    {
+      filter.removeAt(svgIndex);
+    }
+
+    filter << QObject::tr("ALL_FILES_FILTER") + " (*)";
+
+    return filter;
+  };
+
+  static const QStringList filter = addAllFiles();
+  return filter;
+}
+
+/*!
+  Returns a filter for Export File dialog
+*/
+const QStringList& SMESHGUI_Meshio::GetExportFileFilter()
+{
+  static const QStringList filter = {
+    "Abaqus (*.inp)",
+    "ANSYS msh (*.msh)",
+    "AVS-UCD (*.avs)",
+    "CGNS (*.cgns)",
+    "DOLFIN XML (*.xml)",
+    "Exodus (*.e *.exo)",
+    "FLAC3D (*.f3grid)",
+    "Gmsh 2.2 (*.msh)",
+    "Gmsh 4.0, and 4.1 (*.msh)",
+    "H5M (*.h5m)",
+    "Kratos/MDPA (*.mdpa)",
+    "MED/Salome (*.med)",
+    "Medit (*.mesh *.meshb)",
+    "Nastran (*.bdf *fem *.nas)",
+    "Netgen(*.vol *.vol.gz)",
+    "OBJ (*.obj)",
+    "OFF (*.off)",
+    "PERMAS (*.post *.post.gz *.dato *.dato.gz)",
+    "PLY (*.ply)",
+    "STL (*.stl)",
+    "SU2 (*.su2)",
+    "SVG, 2D output only (*.svg)",
+    "Tecplot (*.dat)",
+    "TetGen (*.node *.ele)",
+    "UGRID (*.ugrid)",
+    "VTK (*.vtk)",
+    "VTU (*.vtu)",
+    "WKT, TIN (*.wkt)",
+    "XDMF (*.xdmf *.xmf)"
+  };
+
+  return filter;
+}
+
+/*!
+  Export mesh through an intermediate MED file
+*/
+void SMESHGUI_Meshio::ExportMesh(const meshList& aMeshList, const QString& targetFileName, const QString& selectedFilter)
+{
+  // Helper for indexed naming of the target files.
+  // We need to save into separated files because meshio doesn't
+  // support reading more than one mesh from a MED file.
+  // Look at src/meshio/med/_med.py in meshio git repo for a reference.
+  auto indexedFileName = [](const QString& targetFileName, const int index) -> QString
+  {
+    QString indexedFileName = targetFileName;
+
+    const int lastIndex = indexedFileName.lastIndexOf(".");
+    indexedFileName.insert(lastIndex, "_" + QString::number(index));
+
+    return indexedFileName;
+  };
+
+  // Trim an extension from the filter like in example: 'VTK (.vtk)' => 'VTK'
+  auto getFilterWithoutExt = [](const QString& selectedFilter) -> QString
+  {
+    // Find the start index for an extension in the filter string
+    const int index = selectedFilter.indexOf('(');
+    if (index != -1)
+    {
+      const QString filterWithoutExt = selectedFilter.left(index);
+      return filterWithoutExt.trimmed();
+    }
+
+    return selectedFilter;
+  };
+
+  // Iterate all the meshes from a list
+  auto aMeshIter = aMeshList.begin();
+  for(int aMeshIndex = 0; aMeshIter != aMeshList.end(); aMeshIter++, aMeshIndex++)
+  {
+    SMESH::SMESH_IDSource_var aMeshOrGroup = (*aMeshIter).first;
+    SMESH::SMESH_Mesh_var        aMeshItem = aMeshOrGroup->GetMesh();
+
+    // Exprort this part.
+    aMeshItem->ExportPartToMESHIO(
+      aMeshOrGroup, // mesh part
+      (aMeshIndex ? indexedFileName(targetFileName, aMeshIndex) : targetFileName).toUtf8().data(),
+      getFilterWithoutExt(selectedFilter).toLatin1().data()
+    );
+  }
+}
+
+/*!
+  Opens file dialog and returns a choosen target name
+*/
+QString SMESHGUI_Meshio::GetFileName(QString& selectedFilter, const bool isOpen/* = false*/)
+{
+  // Get a target directory name
+  QString anInitialPath = SUIT_FileDlg::getLastVisitedPath();
+  if (anInitialPath.isEmpty())
+    anInitialPath = QDir::currentPath();
+
+  // Return a target file name
+  return SUIT_FileDlg::getFileName(
+    SMESHGUI::desktop(),
+    anInitialPath,
+    GetExportFileFilter(),
+    selectedFilter,
+    QObject::tr("SMESH_EXPORT_MESH"),
+    isOpen
+  );
+}
+
+/*!
+  Returns true if meshio package is installed
+*/
+bool SMESHGUI_Meshio::IsMeshioInstalled()
+{
+  auto IsAbleToCallMeshio = []() -> bool
+  {
+    // Try to call meshio to check if it's present
+    const std::string cmd =
+      SMESH_Meshio::IsModernPythonVersion() ? "meshio --version" : "meshio-info --version";
+
+    const int status = system(cmd.c_str());
+    MESSAGE("status: " << status);
+
+    return status == 0;
+  };
+
+  static const bool isInstalled = IsAbleToCallMeshio();
+  if (!isInstalled)
+  {
+    SUIT_MessageBox::warning(
+      SMESHGUI::desktop(),
+      QObject::tr("SMESH_WARNING"),
+      QObject::tr("SMESH_MESHIO_NOT_INSTALLED")
+    );
+  }
+
+  return isInstalled;
+}

src/SMESHGUI/SMESHGUI_Meshio.h

@@ -0,0 +1,64 @@
+// Copyright (C) 2007-2024  CEA, EDF, OPEN CASCADE
+//
+// Copyright (C) 2003-2007  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
+// CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+//
+// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
+//
+
+// SMESH SMESHGUI : support of import / export with meshio library
+// File   : SMESHGUI_Meshio.h
+// Author : Konstantin Leontev, Open CASCADE S.A.S.
+//
+#ifndef SMESHGUI_MESHIO_H
+#define SMESHGUI_MESHIO_H
+
+#include "SMESH_SMESHGUI.hxx"
+
+#include <QList>
+#include <QPair>
+
+// IDL includes
+#include <SALOMEconfig.h>
+#include CORBA_CLIENT_HEADER(SMESH_Mesh)
+#include CORBA_SERVER_HEADER(SMESH_Gen)
+
+class QStringList;
+
+class SMESHGUI_EXPORT SMESHGUI_Meshio
+{
+  using meshList = QList<QPair<SMESH::SMESH_IDSource_var, QString>>;
+
+public:
+  SMESHGUI_Meshio();
+  virtual ~SMESHGUI_Meshio();
+
+  static void ExportMesh(
+    const meshList& aMeshList, const QString& targetFileName, const QString& selectedFilter);
+  static SMESH::mesh_array_var ImportMesh(
+    SMESH::SMESH_Gen_ptr theComponentMesh, const QString& filename, QStringList& errors);
+
+  static const QStringList& GetImportFileFilter();
+  static const QStringList& GetExportFileFilter();
+
+  static QString GetFileName(QString& selectedFilter, const bool isOpen = false);
+  static bool CheckMeshCount(const meshList& aMeshList);
+
+  static bool IsMeshioInstalled();
+};
+
+#endif // SMESHGUI_MESHIO_H

src/SMESHGUI/SMESHGUI_Operations.h

@@ -41,6 +41,7 @@ namespace SMESHOp {
     OpImportSTL              = 1103,   // MENU FILE - IMPORT - STL FILE
     OpImportCGNS             = 1104,   // MENU FILE - IMPORT - CGNS FILE
     OpImportGMF              = 1106,   // MENU FILE - IMPORT - GMF FILE
+    OpImportMESHIO           = 1107,   // MENU FILE - IMPORT - other formats... (meshio)
     OpPopupImportDAT         = 1120,   // POPUP MENU - IMPORT - DAT FILE
     OpPopupImportUNV         = 1121,   // POPUP MENU - IMPORT - UNV FILE
     OpPopupImportMED         = 1122,   // POPUP MENU - IMPORT - MED FILE
@@ -54,6 +55,7 @@ namespace SMESHOp {
     OpExportSTL              = 1203,   // MENU FILE  - EXPORT - STL FILE
     OpExportCGNS             = 1204,   // MENU FILE  - EXPORT - CGNS FILE
     OpExportGMF              = 1206,   // MENU FILE  - EXPORT - GMF FILE
+    OpExportMESHIO           = 1207,   // MENU FILE  - EXPORT - other formats... (meshio)
     OpPopupExportDAT         = 1210,   // POPUP MENU - EXPORT - DAT FILE
     OpPopupExportMED         = 1211,   // POPUP MENU - EXPORT - MED FILE
     OpPopupExportUNV         = 1212,   // POPUP MENU - EXPORT - UNV FILE

src/SMESHGUI/SMESH_msg_en.ts

@@ -888,6 +888,14 @@
         <source>MEN_GMF</source>
         <translation>GMF file</translation>
     </message>
+    <message>
+        <source>MEN_IMPORT_MESHIO</source>
+        <translation>other formats... (meshio)</translation>
+    </message>
+    <message>
+        <source>MEN_EXPORT_MESHIO</source>
+        <translation>other formats... (meshio)</translation>
+    </message>
     <message>
         <source>MEN_MERGE</source>
         <translation>Merge Nodes</translation>
@@ -1971,6 +1979,10 @@ so that the application may crash. Do you wish to continue visualization?</trans
 Probably, there is not enough space on disk, or the version of MED file used is not compatible with the mesh.
 </translation>
     </message>
+    <message>
+        <source>SMESH_EXPORT_FAILED_SHORT</source>
+        <translation>Mesh export failed.</translation>
+    </message>
     <message>
         <source>SMESH_EXPORT_MED_DUPLICATED_GRP</source>
         <translation>There are duplicated group names in mesh &quot;%1&quot;.
@@ -2002,6 +2014,22 @@ Overwrite the file?</translation>
 meshes with the following names: %1
 The result file may be incorrect.
 Overwrite the file?</translation>
+    </message>
+    <message>
+        <source>SMESH_EXPORT_MESHIO_ONLY_MESH</source>
+        <translation>Current implementation uses export through intermediate MED file.
+However, meshio does not support reading MED files with more than one mesh.
+Selected meshes will be saved into separated files.
+
+Do you want to continue?</translation>
+    </message>
+    <message>
+        <source>SMESH_MESHIO_NOT_INSTALLED</source>
+        <translation>Meshio is not installed!
+Operation will be canceled.
+
+Try to install meshio with a command:
+pip install meshio[all]</translation>
     </message>
     <message>
         <source>EXPORT_NOT_SUPPORTED</source>

src/SMESHGUI/SMESH_msg_fr.ts

@@ -884,6 +884,14 @@
         <source>MEN_GMF</source>
         <translation>Fichier GMF</translation>
     </message>
+    <message>
+        <source>MEN_IMPORT_MESHIO</source>
+        <translation>autres formats... (meshio)</translation>
+    </message>
+    <message>
+        <source>MEN_EXPORT_MESHIO</source>
+        <translation>autres formats... (meshio)</translation>
+    </message>
     <message>
         <source>MEN_MERGE</source>
         <translation>Fusionner les nœuds</translation>
@@ -1966,6 +1974,10 @@ ce qui peut faire planter l'application. Voulez-vous continuer la visualisation
         <translation>Impossible d'exporter le maillage.
 Vérifiez l'espace disponible sur le disque.</translation>
     </message>
+    <message>
+        <source>SMESH_EXPORT_FAILED_SHORT</source>
+        <translation>Impossible d'exporter le maillage.</translation>
+    </message>
     <message>
         <source>SMESH_EXPORT_MED_DUPLICATED_GRP</source>
         <translation>Il y a des noms de groupes dupliqués dans le maillage &quot;%1&quot;.
@@ -1997,6 +2009,22 @@ Ecraser le fichier ?</translation>
 des maillages avec les noms suivants: %1
 Le fichier obtenu pourrait être incorrect.
 Ecraser le fichier ?</translation>
+    </message>
+    <message>
+        <source>SMESH_EXPORT_MESHIO_ONLY_MESH</source>
+        <translation>La mise en œuvre actuelle utilise l'exportation via un fichier MED intermédiaire.
+Cependant, meshio ne prend pas en charge la lecture des fichiers MED comportant plusieurs maillages.
+Les maillages sélectionnés seront enregistrés dans des fichiers séparés.
+
+Voulez-vous continuer?</translation>
+    </message>
+    <message>
+        <source>SMESH_MESHIO_NOT_INSTALLED</source>
+        <translation>Meshio n'est pas installé!
+L'opération sera annulée.
+
+Essayez d'installer meshio avec une commande:
+pip install meshio[all]</translation>
     </message>
     <message>
         <source>EXPORT_NOT_SUPPORTED</source>

src/SMESHGUI/SMESH_msg_ja.ts

@@ -723,6 +723,14 @@
       <source>MEN_GMF</source>
       <translation>GMFファイル</translation>
     </message>
+    <message>
+        <source>MEN_IMPORT_MESHIO</source>
+        <translation>他の形式... (meshio)</translation>
+    </message>
+    <message>
+        <source>MEN_EXPORT_MESHIO</source>
+        <translation>他の形式... (meshio)</translation>
+    </message>
     <message>
       <source>MEN_MERGE</source>
       <translation>節点の結合</translation>
@@ -1743,6 +1751,10 @@
       <source>SMESH_EXPORT_FAILED</source>
       <translation>メッシュをエクスポートすることができません。ディスクの空き領域を確認してください。</translation>
     </message>
+    <message>
+        <source>SMESH_EXPORT_FAILED_SHORT</source>
+        <translation>メッシュのエクスポートに失敗しました。</translation>
+    </message>
     <message>
       <source>SMESH_EXPORT_MED_DUPLICATED_GRP</source>
       <translation>「%1」メッシュ内で重複するグループの名前です。エクスポートをキャンセルすることができ、名前の変更、結果の MED ファイル名に非グループの場合は研究の名前を一致しません。続行しますか。</translation>
@@ -1763,6 +1775,22 @@
       <source>SMESH_EXPORT_MED_MESH_NAMES_COLLISION</source>
       <translation>選択したファイルには既に次の名を持つメッシュが含まれています: %1 結果ファイルが正しくない可能性があります。ファイルを上書きしますか。</translation>
     </message>
+    <message>
+      <source>SMESH_EXPORT_MESHIO_ONLY_MESH</source>
+      <translation>現在の実装では、中間 MED ファイルを介したエクスポートが使用されます。
+ただし、mesio は複数のメッシュを含む MED ファイルの読み取りをサポートしていません。
+選択したメッシュは別のファイルに保存されます。
+
+続けたいですか？</translation>
+    </message>
+    <message>
+        <source>SMESH_MESHIO_NOT_INSTALLED</source>
+        <translation>メシオはインストールされていません！
+操作はキャンセルされます。
+
+次のコマンドで mesio をインストールしてみます。
+pip install meshio[all]</translation>
+    </message>
     <message>
       <source>EXPORT_NOT_SUPPORTED</source>
       <translation>名前 '%1' を %2 %3 とメッシュのエクスポートは無視されます。続行しますか。</translation>

src/SMESH_I/CMakeLists.txt

@@ -117,6 +117,7 @@ SET(SMESHEngine_HEADERS
   SMESH_Homard_i.hxx
   SMESH_SequentialMesh_i.hxx
   SMESH_ParallelMesh_i.hxx
+  SMESH_Meshio.h
 )
 
 # --- sources ---
@@ -147,6 +148,7 @@ SET(SMESHEngine_SOURCES
   MG_ADAPT_i.cxx
   SMESH_Homard_i.cxx
   SMESH_ParallelMesh_i.cxx
+  SMESH_Meshio.cxx
 )
 
 # --- rules ---

src/SMESH_I/SMESH_Gen_i.cxx

@@ -112,6 +112,7 @@
 #include <SMESH_BoostTxtArchive.hxx>
 #include <SMESH_SequentialMesh_i.hxx>
 #include <SMESH_ParallelMesh_i.hxx>
+#include "SMESH_Meshio.h"
 
 // to pass CORBA exception through SMESH_TRY
 #define SMY_OWN_CATCH catch( SALOME::SALOME_Exception& se ) { throw se; }
@@ -1350,6 +1351,39 @@ namespace
          SALOME::BAD_PARAM );
     }
   }
+
+  //================================================================================
+  /*!
+   * \brief Makes a python dump for a function by iterating the given SObjects 
+   */
+  //================================================================================
+
+  void functionToPythonDump(
+    SMESH_Gen_i* smesh, const std::string& functionName, std::vector<SALOMEDS::SObject_wrap>& sobjects)
+  {
+    TPythonDump aPythonDump(smesh);
+    aPythonDump << "([";
+
+    int i = 0;
+    for (const SALOMEDS::SObject_wrap& so : sobjects)
+    {
+      if (i > 0)
+      {
+        aPythonDump << ", ";
+      }
+
+      if (!so->_is_nil())
+      {
+        aPythonDump << so;
+      }
+      else
+      {
+        aPythonDump << "mesh_" << i;
+      }
+    }
+
+    aPythonDump << "], status) = " << smesh << functionName;
+  }
 }
 
 //=============================================================================
@@ -1649,6 +1683,91 @@ SMESH_Gen_i::CreateMeshesFromGMF( const char*             theFileName,
   return aMesh._retn();
 }
 
+//================================================================================
+/*!
+ * \brief Create a mesh and import data from any file supported by meshio library
+ */
+//================================================================================
+
+SMESH::mesh_array* SMESH_Gen_i::CreateMeshesFromMESHIO(const char* theFileName,
+                                                       SMESH::DriverMED_ReadStatus& theStatus)
+{
+  Unexpect aCatch(SALOME_SalomeException);
+  checkFileReadable(theFileName);
+
+  MESSAGE("Import part with meshio through an intermediate MED file");
+
+  // Create an object that holds a temp file name and
+  // removes the file when goes out of scope.
+  SMESH_Meshio meshio;
+  const QString tempFileName = meshio.CreateTempFileName(theFileName);
+
+  // Convert temp file into a target one with meshio command
+  meshio.Convert(theFileName, tempFileName);
+
+  // We don't need a python dump from SMESH_Gen_i::CreateMeshesFromMED(), so
+  // we can't use this method as is here. The followed code is an edited part of
+  // copy pasted CreateMeshesFromMED().
+
+  // Retrieve mesh names from the file
+  DriverMED_R_SMESHDS_Mesh myReader;
+  myReader.SetFile(tempFileName.toStdString());
+  myReader.SetMeshId(-1);
+  Driver_Mesh::Status aStatus;
+  list<string> aNames = myReader.GetMeshNames(aStatus);
+  SMESH::mesh_array_var aResult = new SMESH::mesh_array();
+  theStatus = (SMESH::DriverMED_ReadStatus)aStatus;
+
+  if (theStatus == SMESH::DRS_OK)
+  {
+    SALOMEDS::StudyBuilder_var aStudyBuilder;
+    aStudyBuilder = getStudyServant()->NewBuilder();
+    aStudyBuilder->NewCommand();  // There is a transaction
+
+    aResult->length(aNames.size());
+    std::vector<SALOMEDS::SObject_wrap> sobjects;
+    int i = 0;
+
+    // Iterate through all meshes and create mesh objects
+    for (const std::string& meshName : aNames)
+    {
+      // create mesh
+      SMESH::SMESH_Mesh_var mesh = createMesh();
+
+      // publish mesh in the study
+      SALOMEDS::SObject_wrap aSO;
+      if (CanPublishInStudy(mesh))
+        aSO = PublishMesh(mesh.in(), meshName.c_str());
+
+      // Save SO to use in a python dump
+      sobjects.emplace_back(aSO);
+
+      // Read mesh data (groups are published automatically by ImportMEDFile())
+      SMESH_Mesh_i* meshServant = dynamic_cast<SMESH_Mesh_i*>(GetServant(mesh).in());
+      ASSERT(meshServant);
+      SMESH::DriverMED_ReadStatus status1 =
+        meshServant->ImportMEDFile(tempFileName.toUtf8().data(), meshName.c_str());
+      if (status1 > theStatus)
+        theStatus = status1;
+
+      aResult[i++] = SMESH::SMESH_Mesh::_duplicate(mesh);
+      meshServant->GetImpl().GetMeshDS()->Modified();
+    }
+
+    if (!aStudyBuilder->_is_nil())
+      aStudyBuilder->CommitCommand();
+
+    // Python dump
+    const std::string functionName = std::string(".CreateMeshesFromMESHIO(r'") + theFileName + "')";
+    functionToPythonDump(this, functionName, sobjects);
+  }
+
+  // Dump creation of groups
+  for (CORBA::ULong  i = 0; i < aResult->length(); ++i)
+    SMESH::ListOfGroups_var groups = aResult[i]->GetGroups();
+
+  return aResult._retn();
+}
 
 //=============================================================================
 /*!

src/SMESH_I/SMESH_Gen_i.hxx

@@ -256,6 +256,10 @@ public:
                                              CORBA::Boolean          theMakeRequiredGroups,
                                              SMESH::ComputeError_out theError);
 
+  //  Create a mesh and import data from any file supported by meshio library
+  SMESH::mesh_array* CreateMeshesFromMESHIO(const char*             theFileName,
+                                            SMESH::DriverMED_ReadStatus& theStatus);
+
   // Create dual mesh of a tetrahedron mesh
   SMESH::SMESH_Mesh_ptr CreateDualMesh(SMESH::SMESH_IDSource_ptr meshPart,
                                        const char*               meshName,

src/SMESH_I/SMESH_Mesh_i.cxx

@@ -57,6 +57,7 @@
 #include "SMESH_PreMeshInfo.hxx"
 #include "SMESH_PythonDump.hxx"
 #include "SMESH_subMesh_i.hxx"
+#include "SMESH_Meshio.h"
 
 #include <SALOMEDS_Attributes_wrap.hxx>
 #include <SALOMEDS_wrap.hxx>
@@ -4052,6 +4053,55 @@ void SMESH_Mesh_i::ExportPartToMED(SMESH::SMESH_IDSource_ptr meshPart,
   SMESH_CATCH( SMESH::throwCorbaException );
 }
 
+//================================================================================
+/*!
+ * \brief Export a part of mesh to a file with meshio library
+ */
+//================================================================================
+
+void SMESH_Mesh_i::ExportPartToMESHIO(SMESH::SMESH_IDSource_ptr meshPart,
+                                      const char*               file,
+                                      const char*               selectedFilter)
+{
+  // Get default MED version
+  SMESH::long_array_var medVersions = GetMEDVersionsCompatibleForAppend();
+  const CORBA::Long version = medVersions[0];
+  MESSAGE("Export part with meshio through MED version: " << version);
+
+  // Default values are the same as for MED export
+  const bool auto_groups = false;
+  const bool overwrite = true;
+  const bool autoDimension = true;
+  const GEOM::ListOfFields fields;
+  const char* geomAssocFields = "";
+  const double ZTolerance = -1.0;
+  const bool saveNumbers = true;
+
+  // Create an object that holds a temp file name and
+  // removes the file when goes out of scope.
+  SMESH_Meshio meshio(selectedFilter);
+  const QString tempFileName = meshio.CreateTempFileName(file);
+
+  // Export a given mesh into the temp file
+  MEDFileSpeCls spe(tempFileName.toUtf8().data(), overwrite, version);
+  this->ExportPartToMEDCommon(spe, meshPart, auto_groups, autoDimension, fields,
+                               geomAssocFields, ZTolerance, saveNumbers);
+
+  // Convert temp file into a target one with meshio command
+  meshio.Convert(tempFileName, file);
+
+  // Prepare python dump
+  SMESH_TRY;
+
+  TPythonDump() << _this() << ".ExportPartToMESHIO("
+                << meshPart << ", r'"
+                << file << "', '"
+                << selectedFilter << "'"
+                << ")";
+
+  SMESH_CATCH(SMESH::throwCorbaException);
+}
+
 //================================================================================
 
 class MEDFileMemSpeCls

src/SMESH_I/SMESH_Mesh_i.hxx

@@ -248,6 +248,10 @@ public:
                        CORBA::Double             ZTolerance,
                        CORBA::Boolean            saveNumbers );
 
+  void ExportPartToMESHIO(SMESH::SMESH_IDSource_ptr meshPart,
+                          const char*               file,
+                          const char*               selectedFilter);
+
   CORBA::LongLong ExportPartToMEDCoupling(SMESH::SMESH_IDSource_ptr meshPart,
                                           CORBA::Boolean            auto_groups,
                                           CORBA::Boolean            autoDim,

src/SMESH_I/SMESH_Meshio.cxx

@@ -0,0 +1,245 @@
+// Copyright (C) 2007-2024  CEA, EDF, OPEN CASCADE
+//
+// Copyright (C) 2003-2007  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
+// CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+//
+// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
+//
+
+// SMESH SMESH_I : support of import / export with meshio library
+// File   : SMESH_Meshio.h
+// Author : Konstantin Leontev, Open CASCADE S.A.S.
+//
+
+#include "SMESH_Meshio.h"
+
+// SALOME KERNEL includes
+#include <SALOMEDS_Tool.hxx>
+#include <Basics_DirUtils.hxx>
+#include <SALOME_Exception.hh>
+#include <utilities.h>
+
+// Qt
+#include <QFileInfo>
+
+#include <fstream>
+
+
+/*!
+  Constructor
+*/
+SMESH_Meshio::SMESH_Meshio()
+{
+  CreateErrorFileName();
+}
+
+/*!
+  Constructor
+*/
+SMESH_Meshio::SMESH_Meshio(const QString& selectedFilter)
+: SMESH_Meshio()
+{
+  mySelectedFilter = selectedFilter;
+}
+
+/*!
+  Destructor
+*/
+SMESH_Meshio::~SMESH_Meshio()
+{
+  RemoveTempFile();
+  RemoveErrorFile();
+}
+
+/*!
+  Convert file with meshio convert command
+*/
+void SMESH_Meshio::Convert(const QString& sourceFileName, const QString& targetFileName) const
+{
+  // Execute meshio convert command
+  const QString convert = IsModernPythonVersion() ? "meshio convert " : "meshio-convert ";
+  const QString optArgs = GetConvertOptArgs();
+
+  const std::string cmd = 
+    (convert + optArgs + " " + sourceFileName + " " + targetFileName + " 2> " + myErrorFileName).toStdString();
+  MESSAGE("Call system(\"" << cmd << "\") ...");
+
+  const int status = system(cmd.c_str());
+  MESSAGE("status: " << status);
+
+  // Check results
+  if (status != 0 || !Kernel_Utils::IsExists(targetFileName.toStdString()))
+  {
+    // Get all the output from an error file
+    const std::string meshioErrors = ReadErrorsFromFile();
+    MESSAGE("meshioErrors: \n" << meshioErrors);
+
+    SALOME::ExceptionStruct es;
+    es.type = SALOME::ExceptionType::BAD_PARAM;
+    es.lineNumber = -1;
+    es.text = CORBA::string_dup(
+      ("MESHIO\nFailed system(\"" + cmd + "\").\n\n" + meshioErrors + "\nOperation canceled.").c_str());
+
+    throw SALOME::SALOME_Exception(es);
+  }
+}
+
+/*!
+  Returns a name for a file in default temp directory
+  based on a target basename.
+*/
+QString SMESH_Meshio::CreateTempFileName(const QString& targetFileName)
+{
+  // Make a name for a temp file
+  const QFileInfo fileInfo(targetFileName);
+  const QString targetBaseName = fileInfo.baseName();
+  const QString dirName(SALOMEDS_Tool::GetTmpDir().c_str());
+  myTempFileName = dirName + targetBaseName + ".med";
+
+  MESSAGE("targetFileName: " << targetFileName.toStdString());
+  MESSAGE("myTempFileName: " << myTempFileName.toStdString());
+
+  return myTempFileName;
+}
+
+/*!
+  Removes the temporary file if we have any
+*/
+void SMESH_Meshio::RemoveTempFile()
+{
+  if (!myTempFileName.isEmpty())
+  {
+    std::remove(myTempFileName.toStdString().c_str());
+    MESSAGE("Temp file " << myTempFileName.toStdString() << " was removed");
+  }
+}
+
+/*!
+  Returns true if current Python equal or newer than required version for
+  meshio release from 5.0 and greater.
+*/
+bool SMESH_Meshio::IsModernPythonVersion()
+{
+  // It's a version when meshio commands were changed from using
+  // many executables for each operation to one for everything (meshio 5.0).
+  // For example, from
+  // meshio-convert input.msh output.vtk
+  // to
+  // meshio convert input.msh output.vtk
+ 
+  const std::vector<int> minReqVersionNums = { 3, 7 };
+
+  auto GetCurrentVersion = []() -> QString
+  {
+    const char *envVar = std::getenv("PYTHON_VERSION");
+    if (envVar && (envVar[0] != '\0'))
+    {
+      return envVar;
+    }
+
+    return {};
+  };
+
+  auto IsModernVersion = [&]() -> bool
+  {
+    const QString curVersion = GetCurrentVersion();
+    MESSAGE("Current Python version: " << curVersion.toStdString())
+    if (curVersion.length() < 3)
+      return false;
+
+    int index = 0;
+    const QStringList curVersionNums = curVersion.split('.');
+    for (const int minVersion : minReqVersionNums)
+    {
+      if (minVersion > curVersionNums[index].toInt())
+      {
+        return false;
+      }
+
+      ++index;
+    }
+
+    return true;
+  };
+
+  static const bool isModern = IsModernVersion();
+  return isModern;
+}
+
+/*!
+  Creates a temp file for error output from meshio command.
+*/
+void SMESH_Meshio::CreateErrorFileName()
+{
+  // Make a name for a temp file
+  const QString fileName = "meshio_errors.txt";
+  const QString dirName(SALOMEDS_Tool::GetTmpDir().c_str());
+  myErrorFileName = dirName + fileName;
+  
+  MESSAGE("myErrorFileName: " << myErrorFileName.toStdString());
+}
+
+/*!
+  Removes the temporary error output file if we have any
+*/
+void SMESH_Meshio::RemoveErrorFile()
+{
+  if (!myErrorFileName.isEmpty())
+  {
+    std::remove(myErrorFileName.toStdString().c_str());
+    MESSAGE("Temp file " << myErrorFileName.toStdString() << " was removed");
+  }
+}
+
+/*!
+  Read all errors output from a temp file
+*/
+std::string SMESH_Meshio::ReadErrorsFromFile() const
+{
+  if (myErrorFileName.isEmpty())
+    return {};
+
+  std::ifstream fileStream(myErrorFileName.toStdString());
+  if(fileStream)
+  {
+    std::ostringstream ss;
+    ss << fileStream.rdbuf();
+
+    return ss.str();
+  }
+
+  return {};
+}
+
+/*!
+  Get optional arguments for meshio convert command
+*/
+QString SMESH_Meshio::GetConvertOptArgs() const
+{
+  if (mySelectedFilter.isEmpty())
+    return mySelectedFilter;
+
+  // Check what kind of option we must provide
+  if (mySelectedFilter.startsWith("ANSYS"))
+    return "-o ansys";
+  else if (mySelectedFilter.startsWith("Gmsh 2"))
+    return "-o gmsh22";
+  else if (mySelectedFilter.startsWith("Gmsh 4"))
+    return "-o gmsh";
+
+  return {};
+}

src/SMESH_I/SMESH_Meshio.h

@@ -0,0 +1,61 @@
+// Copyright (C) 2007-2024  CEA, EDF, OPEN CASCADE
+//
+// Copyright (C) 2003-2007  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
+// CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+//
+// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
+//
+
+// SMESH SMESH_I : support of import / export with meshio library
+// File   : SMESH_Meshio.h
+// Author : Konstantin Leontev, Open CASCADE S.A.S.
+//
+#ifndef SMESH_MESHIO_H
+#define SMESH_MESHIO_H
+
+#include "SMESH.hxx"
+
+#include <QString>
+
+
+class SMESH_I_EXPORT SMESH_Meshio
+{
+public:
+  SMESH_Meshio();
+  SMESH_Meshio(const QString& selectedFilter);
+  virtual ~SMESH_Meshio();
+
+  QString CreateTempFileName(const QString& targetFileName);
+  void Convert(const QString& sourceFileName, const QString& targetFileName) const;
+
+  static bool IsModernPythonVersion();
+
+private:
+  void RemoveTempFile();
+  void CreateErrorFileName();
+  void RemoveErrorFile();
+  std::string ReadErrorsFromFile() const;
+
+  QString GetConvertOptArgs() const;
+
+private:
+  QString myTempFileName;
+  QString myErrorFileName;
+  QString mySelectedFilter;
+};
+
+#endif // SMESH_MESHIO_H

src/SMESH_SWIG/smeshBuilder.py

@@ -741,6 +741,19 @@ class smeshBuilder( SMESH._objref_SMESH_Gen, object ):
         if error.comment: print("*** CreateMeshesFromGMF() errors:\n", error.comment)
         return Mesh(self, self.geompyD, aSmeshMesh), error
 
+    def CreateMeshesFromMESHIO(self, theFileName):
+        """
+        Create a Mesh object(s) importing data from from any file supported by meshio library.
+
+        Returns:
+                a tuple ( list of class :class:`Mesh` instances,
+                :class:`SMESH.DriverMED_ReadStatus` )
+        """
+
+        aSmeshMeshes, aStatus = SMESH._objref_SMESH_Gen.CreateMeshesFromMESHIO(self, theFileName)
+        aMeshes = [ Mesh(self, self.geompyD, m) for m in aSmeshMeshes ]
+        return aMeshes, aStatus
+
     def Concatenate( self, meshes, uniteIdenticalGroups,
                      mergeNodesAndElements = False, mergeTolerance = 1e-5, allGroups = False,
                      name = "", meshToAppendTo = None):
@@ -2596,6 +2609,47 @@ class Mesh(metaclass = MeshMeta):
             meshPart = self.mesh
         self.mesh.ExportGMF(meshPart, f, True)
 
+    def ExportMESHIO(
+        self,
+        fileName,
+        selectedFilter,
+        meshPart
+    ):
+        """
+        Exports a part of mesh to a file with meshio library
+        through an intermediate MED file.
+
+        Parametrs described below are the same as for ExportMED() method.
+        However, we know that _pyMesh::Process(const Handle(_pyCommand)& theCommand) method
+        change a position of meshPart argument when dump to a Python script for whatever reason
+        this way:
+        - to 5th place for ExportMED command
+        - to last place for the rest commands
+
+        So, for this method meshPart moved to the end of the args.
+        Look at src/SMESH_I/SMESH_2smeshpy.cxx for related source code.
+
+        The same note is for the name of the method that was dumped as ExportPartToMESHIO(),
+        but then processing just removes PartTo from the middle of the name as it was done
+        for all export methods.
+
+        Parameters:
+                fileName: is the file name
+                selectedFilter: filter string selected by user in a file dialog
+                meshPart: a part of mesh (:class:`sub-mesh, group or filter <SMESH.SMESH_IDSource>`)
+                        to export instead of the mesh
+        """
+
+        if isinstance(meshPart, Mesh):
+            meshPart = meshPart.GetMesh()
+
+        self.mesh.ExportPartToMESHIO(
+            meshPart,
+            fileName,
+            selectedFilter
+        )
+
+
     def ExportToMED(self, *args, **kwargs):
         """
         Deprecated, used only for compatibility! Please, use :meth:`ExportMED` method instead.

test/SMESH_MeshioFiles.py

@@ -0,0 +1,181 @@
+#  -*- coding: iso-8859-1 -*-
+# Copyright (C) 2007-2024  CEA, EDF, OPEN CASCADE
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+#
+# See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
+#
+
+# =======================================
+# Testing export/import of sample meshes from meshio repository
+#  File   : SMESH_MeshioFiles.py
+#  Module : SMESH
+
+import tempfile
+import subprocess
+import os
+from pathlib import Path
+
+from SMESH_MeshioShapes import export_mesh, import_file
+
+
+def supported_extensions():
+    """
+    Returns a list of format extensions that salome already supports
+    for import/export operations.
+    """
+
+    return [
+        '.med',
+        '.unv',
+        '.stl',
+        '.cgns',
+        '.mesh',
+        '.meshb'
+    ]
+
+
+def convert(source_file, target_file, errors):
+    """
+    Converts files with meshio shell command.
+    """
+    try:
+        cmd = 'meshio convert {} {}'.format(source_file, target_file)
+        print('{} start...'.format(cmd))
+
+        subprocess.run(['meshio', 'convert', source_file, target_file], check=True)
+
+        return True
+
+    except Exception:
+        source_ext = Path(source_file).suffix.upper()
+        target_ext = Path(target_file).suffix.upper()
+
+        errors.append('[{} -> {}]: {} failed!'.format(source_ext, target_ext, cmd))
+
+        return False
+
+
+def print_errors(errors):
+    """
+    Checks if we have got any saved error messages and print them.
+    """
+
+    if not len(errors):
+        return
+
+    print('\nErrors:')
+    for idx, err in enumerate(errors):
+        print('{:02}: {}'.format(idx, err))
+
+    print('\n===============================================')
+
+
+def perform_ext(directory, ext, errors):
+    """
+    Exports a given mesh and imports it back for each mesh file
+    through a file with a given extension.
+    It uses shell meshio convert command for conversion.
+    """
+
+    for subdir, _, files in os.walk(directory):
+        for file in files:
+
+            # Skip helper files
+            if file.endswith('.md') or file.endswith('Makefile'):
+                continue
+
+            filepath = os.path.join(subdir, file)
+
+            with tempfile.NamedTemporaryFile(suffix=ext) as temp_file:
+                temp_file.close() # prevents PermissionError on Windows
+                if not convert(filepath, temp_file.name, errors):
+                    continue
+
+                file_extension = Path(file).suffix
+                with tempfile.NamedTemporaryFile(suffix=file_extension) as temp_file_back:
+                    temp_file.close() # prevents PermissionError on Windows
+                    temp_file_back.close() # prevents PermissionError on Windows
+                    convert(temp_file.name, temp_file_back.name, errors)
+
+
+def test_shell(directory, errors):
+    """
+    Iterates salome extensions and convert meshes through
+    a corresponding format.
+    .
+    """
+
+    for ext in supported_extensions():
+        perform_ext(directory, ext, errors)
+
+
+def test_salome(directory, errors):
+    """
+    Iterates over mesh files in a given directory and tries to import
+    them into salome and export back to a temp file with the same format.
+    """
+
+    for subdir, _, files in os.walk(directory):
+        for file in files:
+
+            # Skip helper files
+            if file.endswith('.md') or file.endswith('Makefile'):
+                continue
+
+            # Skip files those have issues with current meshio version
+            if (file.endswith('.f3grid') or
+                file.endswith('.ugrid') or
+                file.endswith('.su2') or
+                file.endswith('element_elset.inp') or
+                file.endswith('insulated-4.1.msh') or
+                file.endswith('insulated-2.2.msh') or
+                file.endswith('simple1')):
+                continue
+
+            filepath = os.path.join(subdir, file)
+
+            # Import a file
+            mesh = import_file(filepath, errors)
+            if not mesh:
+                continue
+
+            file_extension = Path(file).suffix
+            with tempfile.NamedTemporaryFile(suffix=file_extension) as temp_file:
+                temp_file.close() # prevents PermissionError on Windows
+                export_mesh(mesh, temp_file.name, errors)
+
+
+def test():
+    """
+    Tests import/export of meshes from a given directory
+    and prints errors if we have any.
+    """
+
+    errors = []
+    directory = 'data/meshio_meshes'
+
+    # Only for debug purpose.
+    # Uncomment if you need to test meshio library shell command itself.
+    # test_shell(directory, errors)
+
+    test_salome(directory, errors)
+
+    print_errors(errors)
+    assert not len(errors)
+
+
+if __name__ == "__main__":
+    test()

test/SMESH_MeshioShapes.py

@@ -0,0 +1,260 @@
+#  -*- coding: iso-8859-1 -*-
+# Copyright (C) 2007-2024  CEA, EDF, OPEN CASCADE
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+#
+# See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
+#
+
+# =======================================
+# Testing export/import of some simple shapes in different formats with meshio library
+#  File   : SMESH_MeshioShapes.py
+#  Module : SMESH
+
+import tempfile
+from pathlib import Path
+
+import salome
+salome.salome_init()
+
+import GEOM
+from salome.geom import geomBuilder
+
+import SMESH
+from salome.smesh import smeshBuilder
+
+import SALOME
+
+# Constants
+EXPORT_TITLE = 'Export'
+IMPORT_TITLE = 'Import'
+UNKNOWN_EXCEPTION = 'Unknown exception'
+OUTPUT_DIVIDER = '\n==============================================='
+
+
+geompy = geomBuilder.New()
+smesh = smeshBuilder.New()
+
+
+def make_plane():
+    """
+    Makes default plane for testing.
+    """
+
+    plane = geompy.MakeFaceHW(100, 100, 1)
+    geompy.addToStudy( plane, 'plane' )
+
+    return plane
+
+
+def make_box():
+    """
+    Makes default box for testing.
+    """
+
+    box = geompy.MakeBoxDXDYDZ(200, 200, 200)
+    geompy.addToStudy(box, 'box')
+
+    return box
+
+
+def make_mesh(shape, name):
+    """
+    Makes a mesh from a given shape.
+    """
+    res_mesh = smesh.Mesh(shape,name)
+    NETGEN_1D_2D = res_mesh.Triangle(algo=smeshBuilder.NETGEN_1D2D)
+    isDone = res_mesh.Compute()
+    assert isDone
+
+    smesh.SetName(res_mesh, name)
+    smesh.SetName(NETGEN_1D_2D.GetAlgorithm(), 'NETGEN 1D-2D')
+    smesh.SetName(res_mesh.GetMesh(), name)
+
+    return res_mesh
+
+
+def file_extensions():
+    """
+    Returns all files extensions supported by meshio.
+    Commented formats should be checked on next meshio release to see if the problem was fixed.
+    """
+
+    return [
+        '.avs',
+        '.bdf',
+        # '.cgns', # meshio IndexError: index 2 is out of bounds for axis 1 with size 2
+        # '.dat', # meshio ValueError: need at least one array to concatenate
+        '.dato',
+        '.dato.gz',
+        '.e',
+        # '.ele', # never returns from meshio convert command
+        '.exo',
+        # '.f3grid', # meshio IndexError: Replacement index 3 out of range for positional args tuple
+        '.fem',
+        # '.h5m', # meshio AttributeError: 'list' object has no attribute 'items'
+        '.inp',
+        '.mdpa',
+        '.med',
+        '.mesh',
+        '.meshb',
+        # '.msh', # meshio KeyError: "Illegal ANSYS cell type 'line'
+        '.nas',
+        # '.node', # never returns from meshio convert command
+        # '.obj', # meshio._exceptions.WriteError: Wavefront .obj files can only contain triangle or quad cells
+        # '.off', # failed on Windows only
+        # '.ply', # Export Warning: PLY doesn't support 64-bit integers. Casting down to 32-bit. Then import failed
+        '.post',
+        '.post.gz',
+        '.stl',
+        # '.su2', # meshio TypeError: cannot unpack non-iterable CellBlock object
+        # '.svg', # meshio._exceptions.WriteError: SVG can only handle flat 2D meshes
+        # '.ugrid', # meshio AttributeError: 'list' object has no attribute 'reshape'
+        '.vol',
+        '.vol.gz',
+        '.vtk',
+        '.vtu',
+        # '.wkt', # Export Warning: WTK only supports triangle cells. Skipping {", ".join(skip)} then import failed
+        '.xdmf',
+        '.xmf',
+        '.xml'
+    ]
+
+
+def exception_handle(file_name, errors, operation_type, ex_text):
+    """
+    Pepares and saves an exception message.
+    """
+
+    ext = Path(file_name).suffix.upper()
+    msg = '{} {} failed! File name: {}'.format(operation_type, ext, file_name)
+    if ex_text:
+        msg += ' Exception: ' + ex_text + OUTPUT_DIVIDER + '\n'
+
+    errors.append(msg)
+
+
+def export_mesh(mesh, file_name, errors):
+    """
+    Performs an export operatin.
+    """
+
+    try:
+        print('Export to file: ', file_name)
+
+        # Here we use an empty selected filter to make things simpler
+        mesh.ExportMESHIO(file_name, '', mesh)
+        return True
+
+    except SALOME.SALOME_Exception as ex:
+        exception_handle(file_name, errors, EXPORT_TITLE, ex.details.text)
+
+    except:
+        exception_handle(file_name, errors, EXPORT_TITLE, UNKNOWN_EXCEPTION)
+
+    return False
+
+
+def import_file(file_name, errors):
+    """
+    Performs an import operatin.
+    """
+
+    try:
+        print('Import from file: ', file_name)
+
+        ([mesh], status) = smesh.CreateMeshesFromMESHIO(file_name)
+        return mesh
+
+    except SALOME.SALOME_Exception as ex:
+        exception_handle(file_name, errors, IMPORT_TITLE, ex.details.text)
+
+    except:
+        exception_handle(file_name, errors, IMPORT_TITLE, UNKNOWN_EXCEPTION)
+
+    return None
+
+
+def print_errors(errors):
+    """
+    Checks if we have got any saved error messages and print them.
+    The test failed in this case.
+    """
+
+    if not len(errors):
+        return
+
+    print('\nErrors:\n')
+    for idx, err in enumerate(errors):
+        print('{:02}: {}'.format(idx, err))
+
+    print(OUTPUT_DIVIDER)
+
+
+def perform(mesh, name, errors):
+    """
+    Exports a given mesh and imports it back for each file format.
+    """
+
+    for ext in file_extensions():
+        with tempfile.NamedTemporaryFile(suffix=ext, prefix=name) as file:
+            file.close() # prevents PermissionError on Windows
+            if (export_mesh(mesh, file.name, errors)):
+                file.close() # prevents PermissionError on Windows
+                import_file(file.name, errors)
+
+
+def test_box(errors):
+    """
+    Tests export / import of a mesh for a default box geometry.
+    """
+
+    box = make_box()
+
+    mesh_name = 'Test_box_'
+    mesh = make_mesh(box, mesh_name)
+    perform(mesh, mesh_name, errors)
+
+
+def test_plane(errors):
+    """
+    Tests export / import of a mesh for a default plane geometry.
+    """
+
+    plane = make_plane()
+
+    mesh_name = 'Test_plane_'
+    mesh = make_mesh(plane, mesh_name)
+    perform(mesh, mesh_name, errors)
+
+
+def test():
+    """
+    Creates meshes from plane and box and tries to export them to a temp files
+    and import them back with different formats supported by meshio library.
+    Prints errors if we have any.
+    """
+
+    errors = []
+
+    test_plane(errors)
+    test_box(errors)
+
+    print_errors(errors)
+    assert not len(errors)
+
+
+if __name__ == "__main__":
+    test()

test/data/meshio_meshes/abaqus/README.md

@@ -0,0 +1,2 @@
+* `UUea.inp`: From http://www-h.eng.cam.ac.uk/help/programs/fe/abaqus/faq68/txt/UUea.inp.txt
+* `nle1xf3c.inp`: From https://abaqus-docs.mit.edu/2017/English/SIMAINPRefResources/nle1xf3c.inp

test/data/meshio_meshes/abaqus/UUea.inp

@@ -0,0 +1,285 @@
+*Heading
+** Job name: UUa Model name: Model-2
+** Generated by: Abaqus/CAE 6.11-1
+*Preprint, echo=NO, model=NO, history=NO, contact=NO
+**
+** PARTS
+**
+*Part, name=Part-1
+*End Part
+**
+**
+** ASSEMBLY
+**
+*Assembly, name=Assembly
+**
+*Instance, name=Part-1-1, part=Part-1
+*Node
+      1,           0.,           0.
+      2,          10.,           0.
+      3,          20.,           0.
+      4,          30.,           0.
+      5,          40.,           0.
+      6,          50.,           0.
+      7,           0.,          10.
+      8,          10.,          10.
+      9,          20.,          10.
+     10,          30.,          10.
+     11,          40.,          10.
+     12,          50.,          10.
+     13,           0.,          20.
+     14,          10.,          20.
+     15,          20.,          20.
+     16,          30.,          20.
+     17,          40.,          20.
+     18,          50.,          20.
+     19,           0.,          30.
+     20,          10.,          30.
+     21,          20.,          30.
+     22,          30.,          30.
+     23,          40.,          30.
+     24,          50.,          30.
+     25,           0.,          40.
+     26,          10.,          40.
+     27,          20.,          40.
+     28,          30.,          40.
+     29,          40.,          40.
+     30,          50.,          40.
+     31,           0.,          50.
+     32,          10.,          50.
+     33,          20.,          50.
+     34,          30.,          50.
+     35,          40.,          50.
+     36,          50.,          50.
+     37,           0.,          60.
+     38,          10.,          60.
+     39,          20.,          60.
+     40,          30.,          60.
+     41,          40.,          60.
+     42,          50.,          60.
+     43,           0.,          70.
+     44,          10.,          70.
+     45,          20.,          70.
+     46,          30.,          70.
+     47,          40.,          70.
+     48,          50.,          70.
+     49,           0.,          80.
+     50,          10.,          80.
+     51,          20.,          80.
+     52,          30.,          80.
+     53,          40.,          80.
+     54,          50.,          80.
+     55,           0.,          90.
+     56,          10.,          90.
+     57,          20.,          90.
+     58,          30.,          90.
+     59,          40.,          90.
+     60,          50.,          90.
+     61,           0.,         100.
+     62,          10.,         100.
+     63,          20.,         100.
+     64,          30.,         100.
+     65,          40.,         100.
+     66,          50.,         100.
+*Element, type=CAX4P
+ 1,  1,  2,  8,  7
+ 2,  2,  3,  9,  8
+ 3,  3,  4, 10,  9
+ 4,  4,  5, 11, 10
+ 5,  5,  6, 12, 11
+ 6,  7,  8, 14, 13
+ 7,  8,  9, 15, 14
+ 8,  9, 10, 16, 15
+ 9, 10, 11, 17, 16
+10, 11, 12, 18,
+17
+11, 13, 14, 20, 19
+12, 14, 15, 21, 20
+13, 15, 16, 22, 21
+14, 16, 17, 23, 22
+15, 17, 18, 24, 23
+16, 19, 20, 26, 25
+17, 20,
+21, 27, 26
+18, 21, 22, 28, 27
+19, 22, 23, 29, 28
+20, 23, 24, 30, 29
+21, 25, 26, 32, 31
+22, 26, 27, 33, 32
+23, 27, 28, 34, 33
+24, 28, 29, 35, 34
+25, 29, 30, 36, 35
+26, 31, 32, 38, 37
+27, 32, 33, 39, 38
+28, 33, 34, 40, 39
+29, 34, 35, 41, 40
+30, 35, 36, 42, 41
+31, 37, 38, 44, 43
+32, 38, 39, 45, 44
+33, 39, 40, 46, 45
+34, 40, 41, 47, 46
+35, 41, 42, 48, 47
+36, 43, 44, 50, 49
+37, 44, 45, 51, 50
+38, 45, 46, 52, 51
+39, 46, 47, 53, 52
+40, 47, 48, 54, 53
+41, 49,
+50, 56, 55
+42, 50, 51, 57, 56
+43, 51, 52, 58, 57
+44, 52, 53, 59, 58
+45, 53, 54, 60, 59
+46, 55, 56, 62, 61
+47, 56,
+57, 63, 62
+48, 57, 58, 64, 63
+49, 58, 59,
+65, 64
+50, 59, 60, 66, 65
+*Nset, nset=_PickedSet2, internal, generate
+  1,  66,   1
+*Elset, elset=_PickedSet2, internal, generate
+  1,  50,   1
+** Section: Section-1
+*Solid Section, elset=_PickedSet2, material=Material-1
+,
+*End Instance
+**
+*Nset, nset=_PickedSet7, internal, instance=Part-1-1, generate
+  1,  61,   6
+*Elset, elset=_PickedSet7, internal, instance=Part-1-1, generate
+  1,  46,   5
+*Nset, nset=_PickedSet8, internal, instance=Part-1-1, generate
+ 1,  6,  1
+*Elset, elset=_PickedSet8, internal, instance=Part-1-1, generate
+ 1,  5,  1
+*Nset, nset=_PickedSet14, internal, instance=Part-1-1, generate
+ 61,  66,   1
+*Elset, elset=_PickedSet14, internal, instance=Part-1-1, generate
+ 46,  50,   1
+*Nset, nset=_PickedSet15, internal, instance=Part-1-1, generate
+  1,  66,   1
+*Elset, elset=_PickedSet15, internal, instance=Part-1-1, generate
+  1,  50,   1
+*Nset, nset=_PickedSet16, internal, instance=Part-1-1, generate
+  1,  66,   1
+*Elset, elset=_PickedSet16, internal, instance=Part-1-1, generate
+  1,  50,   1
+*Nset, nset=_PickedSet17, internal, instance=Part-1-1, generate
+  1,  66,   1
+*Elset, elset=_PickedSet17, internal, instance=Part-1-1, generate
+  1,  50,   1
+*Elset, elset=__PickedSurf12_S3, internal, instance=Part-1-1, generate
+ 46,  50,   1
+*Surface, type=ELEMENT, name=_PickedSurf12, internal
+__PickedSurf12_S3, S3
+*Elset, elset=__PickedSurf13_S2, internal, instance=Part-1-1, generate
+  5,  50,   5
+*Surface, type=ELEMENT, name=_PickedSurf13, internal
+__PickedSurf13_S2, S2
+*Elset, elset=__PickedSurf18_S3, internal, instance=Part-1-1, generate
+ 46,  50,   1
+*Surface, type=ELEMENT, name=_PickedSurf18, internal
+__PickedSurf18_S3, S3
+*End Assembly
+*Amplitude, name=Amp-1
+             0.,              0.,              1.,              1.
+*Amplitude, name=Amp-2
+             0.,              0.,              1.,              1.
+**
+** MATERIALS
+**
+*Material, name=Material-1
+*Density
+ 2.7e-06,
+*Elastic,dependencies=1
+45., 0.2,  0.
+75., 0.2, 100.
+*Permeability, specific=10.
+ 1e-08, 0.3
+*Mohr Coulomb, dependencies=1
+30.,10., , 0.
+40.,20., , 100.
+*Mohr Coulomb Hardening
+ 0.2,   0.,
+ 0.4, 0.05,
+ 0.6, 0.09,
+**
+** BOUNDARY CONDITIONS
+**
+** Name: Bottom-nodes Type: Symmetry/Antisymmetry/Encastre
+*Boundary
+_PickedSet8, YSYMM
+** Name: Side-nodes Type: Symmetry/Antisymmetry/Encastre
+*Boundary
+_PickedSet7, XSYMM
+**
+** PREDEFINED FIELDS
+**
+** Name: Predefined Field-1   Type: Geostatic stress
+*Initial Conditions, type=STRESS, GEOSTATIC
+_PickedSet15, -0.221, 0., -0.221, 100., 1., 1.
+** Name: Predefined Field-2   Type: Void ratio
+*Initial Conditions, TYPE=RATIO
+_PickedSet16, 0.3
+** Name: Predefined Field-3   Type: Pore pressure
+*Initial Conditions, TYPE=PORE PRESSURE
+_PickedSet17, 1.
+** ----------------------------------------------------------------
+**
+** STEP: Step-1
+**
+*Step, name=Step-1
+*Geostatic
+**
+*FIELD, VARIABLE=1, USER
+**
+**
+** LOADS
+**
+** Name: Side-Confining-Stress   Type: Pressure
+*Dsload
+_PickedSurf13, P, 1.221
+** Name: Top-Confining-Stress   Type: Pressure
+*Dsload
+_PickedSurf12, P, 1.221
+**
+** OUTPUT REQUESTS
+**
+*Restart, write, frequency=0
+**
+** FIELD OUTPUT: F-Output-1
+**
+*Output, field, variable=PRESELECT
+**
+** HISTORY OUTPUT: H-Output-1
+**
+*Output, history, variable=PRESELECT
+*End Step
+** ----------------------------------------------------------------
+**
+** STEP: Step-2
+**
+*Step, name=Step-2
+*Soils, consolidation, end=PERIOD, utol=1000.
+0.01, 1., 1e-05, 0.01,
+**
+** BOUNDARY CONDITIONS
+**
+** Name: BC-4 Type: Displacement/Rotation
+*Boundary, amplitude=Amp-1
+_PickedSet14, 2, 2, -50.
+**
+** OUTPUT REQUESTS
+**
+*Restart, write, frequency=0
+**
+** FIELD OUTPUT: F-Output-1
+**
+*Output, field, variable=PRESELECT
+**
+** HISTORY OUTPUT: H-Output-1
+**
+*Output, history, variable=PRESELECT
+*End Step

test/data/meshio_meshes/abaqus/element_elset.inp

@@ -0,0 +1,14 @@
+*Heading
+Abaqus DataFile Version 6.14
+*Node
+1, 1, 0, 0
+2, 1, 1, 0
+3, 2, 0.5, 0
+4, 0, 0.5, 0
+*Element, type=S3, ELSET=right
+1, 1, 2, 3
+*Element, type=S3, ELSET=left
+2, 1, 2, 4
+*Elset, elset=all
+right
+left

test/data/meshio_meshes/abaqus/nle1xf3c.inp

@@ -0,0 +1,59 @@
+*HEADING
+: NAFEMS TEST LE1, Plane Stress Elements -- Elliptic Membr.  [CPS3]
+*RESTART,WRITE
+*NODE, NSET=CF000
+       1,  0.000000000E+00,  0.100000000E+01,  0.000000000E+00
+       2,  0.000000000E+00,  0.187500000E+01,  0.000000000E+00
+       3,  0.000000000E+00,  0.275000000E+01,  0.000000000E+00
+       4,  0.116500008E+01,  0.812829971E+00,  0.000000000E+00
+       5,  0.147400010E+01,  0.155601501E+01,  0.000000000E+00
+       6,  0.178300011E+01,  0.229920006E+01,  0.000000000E+00
+       7,  0.178302014E+01,  0.452999949E+00,  0.000000000E+00
+       8,  0.230790997E+01,  0.900500059E+00,  0.000000000E+00
+       9,  0.283279991E+01,  0.134800017E+01,  0.000000000E+00
+      10,  0.200000000E+01,  0.000000000E+00,  0.000000000E+00
+      11,  0.262500000E+01,  0.000000000E+00,  0.000000000E+00
+      12,  0.325000000E+01,  0.000000000E+00,  0.000000000E+00
+*ELEMENT, TYPE=CPS3, ELSET=M001P001
+    1,     5,     2,     1
+    2,     1,     4,     5
+    3,     8,     5,     4
+    4,     4,     7,     8
+    5,    11,     8,     7
+    6,     7,    10,    11
+    7,     6,     3,     2
+    8,     2,     5,     6
+    9,     9,     6,     5
+   10,     5,     8,     9
+   11,    12,     9,     8
+   12,     8,    11,    12
+*ELSET,ELSET=LOAD
+ 7,9,11
+*ELSET,ELSET=PR
+ 6, 
+*SOLID SECTION, ELSET=M001P001, MATERIAL=M001P001
+0.1000    ,     5
+*MATERIAL, NAME=M001P001
+*ELASTIC, TYPE=ISO
+0.2100E+06, 0.3000    , 0.0000E+00
+*STEP, AMP=RAMP
+LOAD CASE     1
+*STATIC
+*DLOAD, OP=NEW
+ LOAD,P1,-10.0
+*BOUNDARY, OP=NEW
+    1,     1,      , 0.0000E+00
+    2,     1,      , 0.0000E+00
+    3,     1,      , 0.0000E+00
+   10,     2,      , 0.0000E+00
+   11,     2,      , 0.0000E+00
+   12,     2,      , 0.0000E+00
+*EL FILE, ELSET=PR, POSITION=AVERAGED AT NODES
+S, 
+*NODE FILE, GLOBAL=YES
+U, 
+*OUTPUT,FIELD
+*NODE OUTPUT
+U,
+*EL PRINT,POS=AVERAGED AT NODES
+*END STEP

test/data/meshio_meshes/abaqus/wInclude_bulk.inp

@@ -0,0 +1,13 @@
+*NODE
+      1,           0.0,           0.0,           0.0
+      2,           1.0,           0.0,           0.0
+      3,           0.5,           0.0,           0.0
+*ELEMENT, type=B31
+      3,             1,             3
+      4,             3,             2
+*Elset, elset=elBm_set
+ 3, 4
+** Section: elBm_set  Profile: elBm_set
+*Beam Section, elset=elBm_set, material=Bm_mat, temperature=GRADIENT, section=I
+ 0.15, 0.3, 0.15, 0.15, 0.0107, 0.0107, 0.0071
+ 0.0, -1.0, 0.0

test/data/meshio_meshes/abaqus/wInclude_main.inp

@@ -0,0 +1,7 @@
+*Heading
+** meshio with *include example
+*Preprint, echo=NO, model=NO, history=NO, contact=NO
+*constraint controls, print=yes
+*Part, name=ParametricModel
+*INCLUDE,INPUT=wInclude_bulk.inp
+*End Part

test/data/meshio_meshes/flac3d/flac3d_mesh_ex.f3grid

@@ -0,0 +1,307 @@
+* FLAC3D grid produced by FLAC3D 7.00 Release 118
+* Wed Aug 19 01:28:26 2020
+* GRIDPOINTS
+G         1   0.00000000000000e+00   0.00000000000000e+00   0.00000000000000e+00
+G         2   3.33333333333333e-01   0.00000000000000e+00   0.00000000000000e+00
+G         3   0.00000000000000e+00   3.33333333333333e-01   0.00000000000000e+00
+G         4   0.00000000000000e+00   0.00000000000000e+00   3.33333333333333e-01
+G         5   3.33333333333333e-01   3.33333333333333e-01   0.00000000000000e+00
+G         6   0.00000000000000e+00   3.33333333333333e-01   3.33333333333333e-01
+G         7   3.33333333333333e-01   0.00000000000000e+00   3.33333333333333e-01
+G         8   3.33333333333333e-01   3.33333333333333e-01   3.33333333333333e-01
+G         9   6.66666666666667e-01   0.00000000000000e+00   0.00000000000000e+00
+G        10   6.66666666666667e-01   3.33333333333333e-01   0.00000000000000e+00
+G        11   6.66666666666667e-01   0.00000000000000e+00   3.33333333333333e-01
+G        12   6.66666666666667e-01   3.33333333333333e-01   3.33333333333333e-01
+G        13   1.00000000000000e+00   0.00000000000000e+00   0.00000000000000e+00
+G        14   1.00000000000000e+00   3.33333333333333e-01   0.00000000000000e+00
+G        15   1.00000000000000e+00   0.00000000000000e+00   3.33333333333333e-01
+G        16   1.00000000000000e+00   3.33333333333333e-01   3.33333333333333e-01
+G        17   0.00000000000000e+00   6.66666666666667e-01   0.00000000000000e+00
+G        18   3.33333333333333e-01   6.66666666666667e-01   0.00000000000000e+00
+G        19   0.00000000000000e+00   6.66666666666667e-01   3.33333333333333e-01
+G        20   3.33333333333333e-01   6.66666666666667e-01   3.33333333333333e-01
+G        21   6.66666666666667e-01   6.66666666666667e-01   0.00000000000000e+00
+G        22   6.66666666666667e-01   6.66666666666667e-01   3.33333333333333e-01
+G        23   1.00000000000000e+00   6.66666666666667e-01   0.00000000000000e+00
+G        24   1.00000000000000e+00   6.66666666666667e-01   3.33333333333333e-01
+G        25   0.00000000000000e+00   1.00000000000000e+00   0.00000000000000e+00
+G        26   3.33333333333333e-01   1.00000000000000e+00   0.00000000000000e+00
+G        27   0.00000000000000e+00   1.00000000000000e+00   3.33333333333333e-01
+G        28   3.33333333333333e-01   1.00000000000000e+00   3.33333333333333e-01
+G        29   6.66666666666667e-01   1.00000000000000e+00   0.00000000000000e+00
+G        30   6.66666666666667e-01   1.00000000000000e+00   3.33333333333333e-01
+G        31   1.00000000000000e+00   1.00000000000000e+00   0.00000000000000e+00
+G        32   1.00000000000000e+00   1.00000000000000e+00   3.33333333333333e-01
+G        33   0.00000000000000e+00   0.00000000000000e+00   6.66666666666667e-01
+G        34   0.00000000000000e+00   3.33333333333333e-01   6.66666666666667e-01
+G        35   3.33333333333333e-01   0.00000000000000e+00   6.66666666666667e-01
+G        36   3.33333333333333e-01   3.33333333333333e-01   6.66666666666667e-01
+G        37   6.66666666666667e-01   0.00000000000000e+00   6.66666666666667e-01
+G        38   6.66666666666667e-01   3.33333333333333e-01   6.66666666666667e-01
+G        39   1.00000000000000e+00   0.00000000000000e+00   6.66666666666667e-01
+G        40   1.00000000000000e+00   3.33333333333333e-01   6.66666666666667e-01
+G        41   0.00000000000000e+00   6.66666666666667e-01   6.66666666666667e-01
+G        42   3.33333333333333e-01   6.66666666666667e-01   6.66666666666667e-01
+G        43   6.66666666666667e-01   6.66666666666667e-01   6.66666666666667e-01
+G        44   1.00000000000000e+00   6.66666666666667e-01   6.66666666666667e-01
+G        45   0.00000000000000e+00   1.00000000000000e+00   6.66666666666667e-01
+G        46   3.33333333333333e-01   1.00000000000000e+00   6.66666666666667e-01
+G        47   6.66666666666667e-01   1.00000000000000e+00   6.66666666666667e-01
+G        48   1.00000000000000e+00   1.00000000000000e+00   6.66666666666667e-01
+G        49   0.00000000000000e+00   0.00000000000000e+00   1.00000000000000e+00
+G        50   0.00000000000000e+00   3.33333333333333e-01   1.00000000000000e+00
+G        51   3.33333333333333e-01   0.00000000000000e+00   1.00000000000000e+00
+G        52   3.33333333333333e-01   3.33333333333333e-01   1.00000000000000e+00
+G        53   6.66666666666667e-01   0.00000000000000e+00   1.00000000000000e+00
+G        54   6.66666666666667e-01   3.33333333333333e-01   1.00000000000000e+00
+G        55   1.00000000000000e+00   0.00000000000000e+00   1.00000000000000e+00
+G        56   1.00000000000000e+00   3.33333333333333e-01   1.00000000000000e+00
+G        57   0.00000000000000e+00   6.66666666666667e-01   1.00000000000000e+00
+G        58   3.33333333333333e-01   6.66666666666667e-01   1.00000000000000e+00
+G        59   6.66666666666667e-01   6.66666666666667e-01   1.00000000000000e+00
+G        60   1.00000000000000e+00   6.66666666666667e-01   1.00000000000000e+00
+G        61   0.00000000000000e+00   1.00000000000000e+00   1.00000000000000e+00
+G        62   3.33333333333333e-01   1.00000000000000e+00   1.00000000000000e+00
+G        63   6.66666666666667e-01   1.00000000000000e+00   1.00000000000000e+00
+G        64   1.00000000000000e+00   1.00000000000000e+00   1.00000000000000e+00
+G        65   1.66666666666667e-01   1.66666666666667e-01   1.16666666666667e+00
+G        66   1.66666666666667e-01   3.88888888888889e-01   1.16666666666667e+00
+G        67   3.88888888888889e-01   1.66666666666667e-01   1.16666666666667e+00
+G        68   3.88888888888889e-01   3.88888888888889e-01   1.16666666666667e+00
+G        69   6.11111111111111e-01   1.66666666666667e-01   1.16666666666667e+00
+G        70   6.11111111111111e-01   3.88888888888889e-01   1.16666666666667e+00
+G        71   8.33333333333333e-01   1.66666666666667e-01   1.16666666666667e+00
+G        72   8.33333333333333e-01   3.88888888888889e-01   1.16666666666667e+00
+G        73   1.66666666666667e-01   6.11111111111111e-01   1.16666666666667e+00
+G        74   3.88888888888889e-01   6.11111111111111e-01   1.16666666666667e+00
+G        75   6.11111111111111e-01   6.11111111111111e-01   1.16666666666667e+00
+G        76   8.33333333333333e-01   6.11111111111111e-01   1.16666666666667e+00
+G        77   1.66666666666667e-01   8.33333333333333e-01   1.16666666666667e+00
+G        78   3.88888888888889e-01   8.33333333333333e-01   1.16666666666667e+00
+G        79   6.11111111111111e-01   8.33333333333333e-01   1.16666666666667e+00
+G        80   8.33333333333333e-01   8.33333333333333e-01   1.16666666666667e+00
+G        81   3.33333333333333e-01   3.33333333333333e-01   1.33333333333333e+00
+G        82   3.33333333333333e-01   4.44444444444444e-01   1.33333333333333e+00
+G        83   4.44444444444444e-01   3.33333333333333e-01   1.33333333333333e+00
+G        84   4.44444444444444e-01   4.44444444444444e-01   1.33333333333333e+00
+G        85   5.55555555555556e-01   3.33333333333333e-01   1.33333333333333e+00
+G        86   5.55555555555556e-01   4.44444444444444e-01   1.33333333333333e+00
+G        87   6.66666666666667e-01   3.33333333333333e-01   1.33333333333333e+00
+G        88   6.66666666666667e-01   4.44444444444444e-01   1.33333333333333e+00
+G        89   3.33333333333333e-01   5.55555555555556e-01   1.33333333333333e+00
+G        90   4.44444444444444e-01   5.55555555555556e-01   1.33333333333333e+00
+G        91   5.55555555555556e-01   5.55555555555556e-01   1.33333333333333e+00
+G        92   6.66666666666667e-01   5.55555555555556e-01   1.33333333333333e+00
+G        93   3.33333333333333e-01   6.66666666666667e-01   1.33333333333333e+00
+G        94   4.44444444444444e-01   6.66666666666667e-01   1.33333333333333e+00
+G        95   5.55555555555556e-01   6.66666666666667e-01   1.33333333333333e+00
+G        96   6.66666666666667e-01   6.66666666666667e-01   1.33333333333333e+00
+G        97   5.00000000000000e-01   5.00000000000000e-01   1.50000000000000e+00
+G        98   1.33333333333333e+00   0.00000000000000e+00   0.00000000000000e+00
+G        99   1.33333333333333e+00   3.33333333333333e-01   0.00000000000000e+00
+G       100   1.22222222222222e+00   0.00000000000000e+00   3.33333333333333e-01
+G       101   1.22222222222222e+00   3.33333333333333e-01   3.33333333333333e-01
+G       102   1.66666666666667e+00   0.00000000000000e+00   0.00000000000000e+00
+G       103   1.66666666666667e+00   3.33333333333333e-01   0.00000000000000e+00
+G       104   1.44444444444444e+00   0.00000000000000e+00   3.33333333333333e-01
+G       105   1.44444444444444e+00   3.33333333333333e-01   3.33333333333333e-01
+G       106   2.00000000000000e+00   0.00000000000000e+00   0.00000000000000e+00
+G       107   2.00000000000000e+00   3.33333333333333e-01   0.00000000000000e+00
+G       108   1.66666666666667e+00   0.00000000000000e+00   3.33333333333333e-01
+G       109   1.66666666666667e+00   3.33333333333333e-01   3.33333333333333e-01
+G       110   1.33333333333333e+00   6.66666666666667e-01   0.00000000000000e+00
+G       111   1.22222222222222e+00   6.66666666666667e-01   3.33333333333333e-01
+G       112   1.66666666666667e+00   6.66666666666667e-01   0.00000000000000e+00
+G       113   1.44444444444444e+00   6.66666666666667e-01   3.33333333333333e-01
+G       114   2.00000000000000e+00   6.66666666666667e-01   0.00000000000000e+00
+G       115   1.66666666666667e+00   6.66666666666667e-01   3.33333333333333e-01
+G       116   1.33333333333333e+00   1.00000000000000e+00   0.00000000000000e+00
+G       117   1.22222222222222e+00   1.00000000000000e+00   3.33333333333333e-01
+G       118   1.66666666666667e+00   1.00000000000000e+00   0.00000000000000e+00
+G       119   1.44444444444444e+00   1.00000000000000e+00   3.33333333333333e-01
+G       120   2.00000000000000e+00   1.00000000000000e+00   0.00000000000000e+00
+G       121   1.66666666666667e+00   1.00000000000000e+00   3.33333333333333e-01
+G       122   1.11111111111111e+00   0.00000000000000e+00   6.66666666666667e-01
+G       123   1.11111111111111e+00   3.33333333333333e-01   6.66666666666667e-01
+G       124   1.22222222222222e+00   0.00000000000000e+00   6.66666666666667e-01
+G       125   1.22222222222222e+00   3.33333333333333e-01   6.66666666666667e-01
+G       126   1.33333333333333e+00   0.00000000000000e+00   6.66666666666667e-01
+G       127   1.33333333333333e+00   3.33333333333333e-01   6.66666666666667e-01
+G       128   1.11111111111111e+00   6.66666666666667e-01   6.66666666666667e-01
+G       129   1.22222222222222e+00   6.66666666666667e-01   6.66666666666667e-01
+G       130   1.33333333333333e+00   6.66666666666667e-01   6.66666666666667e-01
+G       131   1.11111111111111e+00   1.00000000000000e+00   6.66666666666667e-01
+G       132   1.22222222222222e+00   1.00000000000000e+00   6.66666666666667e-01
+G       133   1.33333333333333e+00   1.00000000000000e+00   6.66666666666667e-01
+G       134   0.00000000000000e+00   5.00000000000000e-01   1.50000000000000e+00
+G       135   0.00000000000000e+00   3.33333333333333e-01   1.33333333333333e+00
+G       136   0.00000000000000e+00   6.66666666666667e-01   1.33333333333333e+00
+G       137   1.66666666666667e-01   5.00000000000000e-01   1.50000000000000e+00
+G       138   0.00000000000000e+00   5.55555555555556e-01   1.22222222222222e+00
+G       139   1.66666666666667e-01   6.11111111111111e-01   1.38888888888889e+00
+G       140   1.66666666666667e-01   3.88888888888889e-01   1.38888888888889e+00
+G       141   1.66666666666667e-01   5.37037037037037e-01   1.31481481481481e+00
+G       142   0.00000000000000e+00   1.66666666666667e-01   1.16666666666667e+00
+G       143   0.00000000000000e+00   4.44444444444444e-01   1.11111111111111e+00
+G       144   1.66666666666667e-01   2.77777777777778e-01   1.27777777777778e+00
+G       145   1.66666666666667e-01   4.62962962962963e-01   1.24074074074074e+00
+G       146   0.00000000000000e+00   8.33333333333333e-01   1.16666666666667e+00
+G       147   0.00000000000000e+00   7.77777777777778e-01   1.11111111111111e+00
+G       148   1.66666666666667e-01   7.22222222222222e-01   1.27777777777778e+00
+G       149   1.66666666666667e-01   6.85185185185185e-01   1.24074074074074e+00
+G       150   0.00000000000000e+00   7.22222222222222e-01   1.05555555555556e+00
+G       151   1.66666666666667e-01   6.48148148148148e-01   1.20370370370370e+00
+G       152   3.33333333333333e-01   5.00000000000000e-01   1.50000000000000e+00
+G       153   3.33333333333333e-01   5.55555555555556e-01   1.44444444444444e+00
+G       154   3.33333333333333e-01   4.44444444444444e-01   1.44444444444444e+00
+G       155   3.33333333333333e-01   5.18518518518518e-01   1.40740740740741e+00
+G       156   3.33333333333333e-01   3.88888888888889e-01   1.38888888888889e+00
+G       157   3.33333333333333e-01   4.81481481481481e-01   1.37037037037037e+00
+G       158   3.33333333333333e-01   6.11111111111111e-01   1.38888888888889e+00
+G       159   3.33333333333333e-01   5.92592592592593e-01   1.37037037037037e+00
+G       160   3.33333333333333e-01   5.74074074074074e-01   1.35185185185185e+00
+* ZONES
+Z B8 1 1 2 3 4 5 6 7 8
+Z B8 2 2 9 5 7 10 8 11 12
+Z B8 3 9 13 10 11 14 12 15 16
+Z B8 4 3 5 17 6 18 19 8 20
+Z B8 5 5 10 18 8 21 20 12 22
+Z B8 6 10 14 21 12 23 22 16 24
+Z B8 7 17 18 25 19 26 27 20 28
+Z B8 8 18 21 26 20 29 28 22 30
+Z B8 9 21 23 29 22 31 30 24 32
+Z B8 10 4 7 6 33 8 34 35 36
+Z B8 11 7 11 8 35 12 36 37 38
+Z B8 12 11 15 12 37 16 38 39 40
+Z B8 13 6 8 19 34 20 41 36 42
+Z B8 14 8 12 20 36 22 42 38 43
+Z B8 15 12 16 22 38 24 43 40 44
+Z B8 16 19 20 27 41 28 45 42 46
+Z B8 17 20 22 28 42 30 46 43 47
+Z B8 18 22 24 30 43 32 47 44 48
+Z B8 19 33 35 34 49 36 50 51 52
+Z B8 20 35 37 36 51 38 52 53 54
+Z B8 21 37 39 38 53 40 54 55 56
+Z B8 22 34 36 41 50 42 57 52 58
+Z B8 23 36 38 42 52 43 58 54 59
+Z B8 24 38 40 43 54 44 59 56 60
+Z B8 25 41 42 45 57 46 61 58 62
+Z B8 26 42 43 46 58 47 62 59 63
+Z B8 27 43 44 47 59 48 63 60 64
+Z B8 28 49 51 50 65 52 66 67 68
+Z B8 29 51 53 52 67 54 68 69 70
+Z B8 30 53 55 54 69 56 70 71 72
+Z B8 31 50 52 57 66 58 73 68 74
+Z B8 32 52 54 58 68 59 74 70 75
+Z B8 33 54 56 59 70 60 75 72 76
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+Z B8 35 58 59 62 74 63 78 75 79
+Z B8 36 59 60 63 75 64 79 76 80
+Z B8 37 65 67 66 81 68 82 83 84
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+Z P5 46 81 83 82 97 84
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+Z P5 48 85 87 86 97 88
+Z P5 49 82 84 89 97 90
+Z P5 50 84 86 90 97 91
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+Z W6 73 39 122 40 55 123 56
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+Z W6 75 124 126 125 55 127 56
+Z W6 76 40 123 44 56 128 60
+Z W6 77 123 125 128 56 129 60
+Z W6 78 125 127 129 56 130 60
+Z W6 79 44 128 48 60 131 64
+Z W6 80 128 129 131 60 132 64
+Z W6 81 129 130 132 60 133 64
+Z B8 82 134 135 136 137 138 139 140 141
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+Z B8 84 142 49 143 144 50 145 65 66
+Z B8 85 136 138 146 139 147 148 141 149
+Z B8 86 138 143 147 141 150 149 145 151
+Z B8 87 143 50 150 145 57 151 66 73
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+Z W6 90 151 73 150 77 57 61
+Z B8 91 137 140 139 152 141 153 154 155
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+Z B8 93 144 65 145 156 66 157 81 82
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+Z B8 96 145 66 151 157 73 160 82 89
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+Z W6 99 160 89 151 93 73 77
+Z P5 100 152 154 153 97 155
+Z P5 101 154 156 155 97 157
+Z P5 102 156 81 157 97 82
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+Z P5 104 155 157 159 97 160
+Z P5 105 157 82 160 97 89
+Z T4 106 158 159 93 97
+Z T4 107 159 160 93 97
+Z T4 108 160 89 93 97
+* ZONE GROUPS
+ZGROUP "Brick1" SLOT "Default"
+ 6 7 4 5 2 3 1 14 15 12 13 10 11 8 9 22 23 20 21 18
+ 19 16 17 26 27 24 25
+ZGROUP "Pyramid2" SLOT "Default"
+ 38 39 36 37 34 35 32 33 46 47 44 45 42 43 40 41 54 52 30 53
+ 31 50 28 51 29 48 49
+ZGROUP "Tetrahedron4" SLOT "Default"
+ 101 98 99 96 97 108 86 87 106 84 107 85 104 82 105 83 94 95 92 93
+ 90 91 88 89 102 103 100
+ZGROUP "Wedge3" SLOT "Default"
+ 56 78 57 79 76 77 74 75 72 73 80 81 55 70 71 68 62 63 69 60
+ 66 61 67 58 64 59 65
+* FACES
+F Q4 1 1 3 6 4
+F Q4 2 3 17 19 6
+F Q4 3 17 25 27 19
+F Q4 4 4 6 34 33
+F Q4 5 6 19 41 34
+F Q4 6 19 27 45 41
+F Q4 7 33 34 50 49
+F Q4 8 34 41 57 50
+F Q4 9 41 45 61 57
+F Q4 10 135 138 136 134
+F Q4 11 142 143 138 135
+F Q4 12 49 50 143 142
+F Q4 13 138 147 146 136
+F Q4 14 143 150 147 138
+F Q4 15 50 57 150 143
+F T3 16 146 147 61
+F T3 17 147 150 61
+F T3 18 150 57 61
+* FACE GROUPS
+FGROUP "bottom" SLOT "Default"
+ 6 7 4 5 2 3 1 14 15 12 13 10 11 8 9 18 16 17

test/data/meshio_meshes/med/README.md

@@ -0,0 +1,54 @@
+`cylinder.med` is first generated by salome 9.2.2. The mesh version is then modified by HDFView by changing the mesh version from 4.0.0 to 3.0.0 so that it can also be read in gmsh.
+
+`box.med` is generated by code_aster 13.6 using the following command file. A specific displacement field is prescribed to an orthotropic hexahedral element, and we verify if meshio is able to read the current stress/strain/energy data.
+
+```
+DEBUT()
+
+mesh = LIRE_MAILLAGE(FORMAT='MED', INFO=2, UNITE=20)
+
+mesh = DEFI_GROUP(
+    reuse=mesh, MAILLAGE=mesh,
+    CREA_GROUP_NO=(_F(NOM='Left', NOEUD=('N1', 'N2', 'N3', 'N4')),
+                   _F(NOM='Right', NOEUD=('N5', 'N6', 'N7', 'N8'))))
+
+model = AFFE_MODELE(
+    AFFE=_F(MODELISATION=('3D', ), PHENOMENE='MECANIQUE', TOUT='OUI'),
+    MAILLAGE=mesh
+)
+
+mat = DEFI_MATERIAU(
+    ELAS_ORTH=_F(RHO=1.37486e-09, E_L=5329.16, E_T=2418.93, E_N=1746.66,
+                 G_LT=1202.6, G_TN=515.638, G_LN=569.752,
+                 NU_LT=0.450006, NU_TN=0.564862, NU_LN=0.397544,
+                 ALPHA_L=1.0163e-05, ALPHA_T=2.67311e-05, ALPHA_N=6.86122e-05))
+
+load = AFFE_CHAR_MECA(
+    MODELE=model, DDL_IMPO=(_F(GROUP_NO='Left', DX=0, DY=0, DZ=0),
+                            _F(GROUP_NO='Right', DX=1, DY=1, DZ=1))
+)
+
+fieldmat = AFFE_MATERIAU(
+    AFFE=_F(MATER=(mat, ), TOUT='OUI'),
+    MODELE=model
+)
+
+resu = MECA_STATIQUE(
+    CHAM_MATER=fieldmat,
+    EXCIT=_F(CHARGE=load),
+    MODELE=model,
+    OPTION='SANS',
+    SOLVEUR=_F(METHODE='MUMPS')
+)
+
+resu = CALC_CHAMP(
+    reuse=resu, RESULTAT=resu, CONTRAINTE='SIEF_ELNO', DEFORMATION='EPSI_ELNO', ENERGIE=('ENEL_ELEM', 'ENEL_ELNO'))
+
+IMPR_RESU(
+    FORMAT='MED',
+    RESU=_F(RESULTAT=resu),
+    UNITE=80
+)
+
+FIN()
+```

test/data/meshio_meshes/medit/cube86.mesh

@@ -0,0 +1,211 @@
+MeshVersionFormatted 1
+
+Dimension
+3
+#Mesh generated by GAMBIT converted by GAMBIT_to_LifeV (Martin P.)
+
+Vertices
+39
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+
+Tetrahedra
+86
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+Triangles
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+17  26  38  6
+8  17  38  6

test/data/meshio_meshes/msh/Makefile

@@ -0,0 +1,5 @@
+%-2.2.msh: %.geo
+	gmsh -2 -format msh2 -o $@ $<
+%-4.1.msh: %.geo
+	gmsh -2 -o $@ $<
+all: insulated-2.2.msh insulated-4.1.msh

test/data/meshio_meshes/msh/README.md

@@ -0,0 +1,5 @@
+Two versions of the Gmsh MSH format are covered here: 2.2 and 4.1.
+
+The meshes were generated by Gmsh 4.2.2-git-0766f664d from the same Gmsh GEO file `insulated.geo` as shown in the `Makefile` (`make -j2`); the difference is that the first was passed `-format msh2`, MSH4.1 being the default.
+
+The meshes are coarse versions of a real finite element example and contain 111 3-node triangular domain elements, divided into two Physical Surfaces, and 21 2-node line boundary elements, in a single Physical Line.

test/data/meshio_meshes/msh/insulated-2.2.msh

@@ -0,0 +1,214 @@
+$MeshFormat
+2.2 0 8
+$EndMeshFormat
+$PhysicalNames
+3
+1 3 "convection"
+2 1 "wire"
+2 2 "insulation"
+$EndPhysicalNames
+$Nodes
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test/data/meshio_meshes/msh/insulated-4.1.msh

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test/data/meshio_meshes/nastran/README.md

@@ -0,0 +1 @@
+`cylinder.fem` is a HyperMesh-generated Optistruct (Nastran-like) mesh file. It contains the same mesh information as that in `../med/cylinder.med`.

test/data/meshio_meshes/nastran/cylinder.fem

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+$$
+$$ Optistruct Input Deck Generated by HyperMesh Version  : 2017.3.0.17
+$$ Generated using HyperMesh-Optistruct Template Version : 2017.3
+$$
+$$   Template:  optistruct
+$$
+$$
+$$ optistruct
+$
+$$------------------------------------------------------------------------------$
+$$                      Case Control Cards                                      $
+$$------------------------------------------------------------------------------$
+$$--------------------------------------------------------------
+$$ HYPERMESH TAGS 
+$$--------------------------------------------------------------
+$$BEGIN TAGS
+$$END TAGS
+$
+BEGIN BULK
+$$
+$$  Stacking Information for Ply-Based Composite Definition
+$$
+
+
+
+
+
+$$
+$$  GRID Data
+$$
+GRID           1        1.0     -2.45-160.0     
+GRID           2        1.0     -2.45-161.0     
+GRID           3        .7071068.70710680.0     
+GRID           4        2.06-15 1.0     0.0     
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+GRID          11        2.06-15 1.0     1.0     
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+GRID          32        .2528394-.303703.4738152
+GRID          33        -0.35812-7.943-2.4813956
+$$
+$$  CBAR Elements
+$$
+CBAR          37               3       11.0     0.0     0.0             
+CBAR          38               4       31.0     0.0     0.0             
+CBAR          39               5       41.0     0.0     0.0             
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+CBAR          41               7       61.0     0.0     0.0             
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+CBAR          49              13      141.0     0.0     0.0             
+CBAR          50              14      151.0     0.0     0.0             
+CBAR          51              15      161.0     0.0     0.0             
+CBAR          52              16       21.0     0.0     0.0             
+CBAR          53               1       21.0     0.0     0.0             
+$
+$HMMOVE        1
+$             37THRU          53
+$$
+$$  CTRIA3 Data
+$$
+CTRIA3       117       0       1       9      17
+CTRIA3       118       0      17      19      18
+CTRIA3       119       0      16       2      21
+CTRIA3       120       0      22      21      20
+$
+$HMMOVE        1
+$            117THRU         120
+$$
+$$  CQUAD4 Elements
+$$
+CQUAD4        19       0       3       1      17      18
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+$
+$HMMOVE        1
+$             19THRU          36
+$$
+$$  CPYRA Elements 5-noded
+$$
+CPYRA          1       0      11       4       3      10      29
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+$
+$HMMOVE        1
+$              1THRU          18
+$$
+$$  CTETRA elements 4-noded
+$$
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+$
+$HMMOVE        1
+$             54THRU         116
+$$
+$$------------------------------------------------------------------------------$
+$$    HyperMesh name and color information for generic components               $
+$$------------------------------------------------------------------------------$
+$HMNAME COMP                   1"misc1" 
+$HWCOLOR COMP                  1      11
+$
+
+$
+
+$
+$$
+$$------------------------------------------------------------------------------$
+$$ HyperMesh Commands for loadcollectors name and color information $
+$$------------------------------------------------------------------------------$
+ENDDATA
+$$
+$$------------------------------------------------------------------------------$$
+$$        Data Definition for AutoDV                                            $$
+$$------------------------------------------------------------------------------$$
+$$
+$$-----------------------------------------------------------------------------$$
+$$        Design Variables Card for Control Perturbations                      $$
+$$-----------------------------------------------------------------------------$$
+$$
+$$------------------------------------------------------------------------------$
+$$        Domain Element Definitions                                            $
+$$------------------------------------------------------------------------------$
+$$
+$$------------------------------------------------------------------------------$$
+$$            Control Perturbation                                              $$
+$$------------------------------------------------------------------------------$$

test/data/meshio_meshes/nastran/cylinder_cells_first.fem

@@ -0,0 +1,245 @@
+$$
+$$ Optistruct Input Deck Generated by HyperMesh Version  : 2017.3.0.17
+$$ Generated using HyperMesh-Optistruct Template Version : 2017.3
+$$
+$$   Template:  optistruct
+$$
+$$
+$$ optistruct
+$
+$$------------------------------------------------------------------------------$
+$$                      Case Control Cards                                      $
+$$------------------------------------------------------------------------------$
+$$--------------------------------------------------------------
+$$ HYPERMESH TAGS
+$$--------------------------------------------------------------
+$$BEGIN TAGS
+$$END TAGS
+$
+BEGIN BULK
+$$
+$$  Stacking Information for Ply-Based Composite Definition
+$$
+
+
+
+
+
+$$
+$$  CBAR Elements
+$$
+CBAR          37               3       11.0     0.0     0.0
+CBAR          38               4       31.0     0.0     0.0
+CBAR          39               5       41.0     0.0     0.0
+CBAR          40               6       51.0     0.0     0.0
+CBAR          41               7       61.0     0.0     0.0
+CBAR          42               8       71.0     0.0     0.0
+CBAR          43               9       81.0     0.0     0.0
+CBAR          44               1       91.0     0.0     0.0
+CBAR          45               2      101.0     0.0     0.0
+CBAR          46              10      111.0     0.0     0.0
+CBAR          47              11      121.0     0.0     0.0
+CBAR          48              12      131.0     0.0     0.0
+CBAR          49              13      141.0     0.0     0.0
+CBAR          50              14      151.0     0.0     0.0
+CBAR          51              15      161.0     0.0     0.0
+CBAR          52              16       21.0     0.0     0.0
+CBAR          53               1       21.0     0.0     0.0
+$
+$HMMOVE        1
+$             37THRU          53
+$$
+$$  CTRIA3 Data
+$$
+CTRIA3       117       0       1       9      17
+CTRIA3       118       0      17      19      18
+CTRIA3       119       0      16       2      21
+CTRIA3       120       0      22      21      20
+$
+$HMMOVE        1
+$            117THRU         120
+$$
+$$  CQUAD4 Elements
+$$
+CQUAD4        19       0       3       1      17      18
+CQUAD4        20       0       4       3      18       5
+CQUAD4        21       0       6       5      18      19
+CQUAD4        22       0       7       6      19       8
+CQUAD4        23       0       9       8      19      17
+CQUAD4        24       0       2      10      20      21
+CQUAD4        25       0      10      11      12      20
+CQUAD4        26       0      12      13      22      20
+CQUAD4        27       0      13      14      15      22
+CQUAD4        28       0      15      16      21      22
+CQUAD4        29       0      11      10       3       4
+CQUAD4        30       0      13      12       5       6
+CQUAD4        31       0      14      13       6       7
+CQUAD4        32       0      16      15       8       9
+CQUAD4        33       0       2      16       9       1
+CQUAD4        34       0       1       3      10       2
+CQUAD4        35       0       5      12      11       4
+CQUAD4        36       0       8      15      14       7
+$
+$HMMOVE        1
+$             19THRU          36
+$$
+$$  CPYRA Elements 5-noded
+$$
+CPYRA          1       0      11       4       3      10      29
+CPYRA          2       0      13       6       5      12      24
+CPYRA          3       0      14       7       6      13      25
+CPYRA          4       0      16       9       8      15      26
+CPYRA          5       0       2       1       9      16      27
+CPYRA          6       0       1       2      10       3      28
+CPYRA          7       0       5       4      11      12      29
+CPYRA          8       0       8       7      14      15      25
+CPYRA          9       0       2      21      20      10      28
+CPYRA         10       0      10      20      12      11      29
+CPYRA         11       0      12      20      22      13      24
+CPYRA         12       0      13      22      15      14      25
+CPYRA         13       0      15      22      21      16      26
+CPYRA         14       0       3      18      17       1      28
+CPYRA         15       0       4       5      18       3      29
+CPYRA         16       0       6      19      18       5      24
+CPYRA         17       0       7       8      19       6      25
+CPYRA         18       0       9      17      19       8      26
+$
+$HMMOVE        1
+$              1THRU          18
+$$
+$$  CTETRA elements 4-noded
+$$
+CTETRA        54       0      29      30      27      20
+CTETRA        55       0      23       8      25      19
+CTETRA        56       0      15      25      22      23
+CTETRA        57       0       5      18      29      30
+CTETRA        58       0      23      27      33      22
+CTETRA        59       0      16       2      27      21
+CTETRA        60       0      32      19      17      26
+CTETRA        61       0      17      19      27      18
+CTETRA        62       0      31      10      29      20
+CTETRA        63       0      27       2      28      21
+CTETRA        64       0      17       1      28      27
+CTETRA        65       0      27      20      22      21
+CTETRA        66       0      32      26      17       9
+CTETRA        67       0      31      20      29      27
+CTETRA        68       0      28      20      27      21
+CTETRA        69       0      27      24      22      20
+CTETRA        70       0      28       2      27       1
+CTETRA        71       0       6      13      33      24
+CTETRA        72       0      19      24      33      27
+CTETRA        73       0      29      20      12      30
+CTETRA        74       0      16      21      32      26
+CTETRA        75       0      23      22      33      25
+CTETRA        76       0      31      18      29       3
+CTETRA        77       0      29      18      31      27
+CTETRA        78       0      23      25      33      19
+CTETRA        79       0      21      26      23      32
+CTETRA        80       0      29      18      27      30
+CTETRA        81       0      29      30      12       5
+CTETRA        82       0      27      19      32      23
+CTETRA        83       0      28      18      17      27
+CTETRA        84       0      24      33      22      13
+CTETRA        85       0      29      10      31       3
+CTETRA        86       0      23       8      15      25
+CTETRA        87       0      27      18      19      24
+CTETRA        88       0      17       1      27       9
+CTETRA        89       0      16      26      32       9
+CTETRA        90       0      26       8      23      19
+CTETRA        91       0      15      23      22      26
+CTETRA        92       0      21      32      23      27
+CTETRA        93       0      32      19      26      23
+CTETRA        94       0      26       8      15      23
+CTETRA        95       0      30      24      27      20
+CTETRA        96       0       5      18      30      24
+CTETRA        97       0      30      20      12      24
+CTETRA        98       0      30      18      27      24
+CTETRA        99       0      30      24      12       5
+CTETRA       100       0      21      27      23      22
+CTETRA       101       0      22      33      25      13
+CTETRA       102       0      28      10      31      20
+CTETRA       103       0      28      20      31      27
+CTETRA       104       0      28      18      31       3
+CTETRA       105       0      31      18      28      27
+CTETRA       106       0      31      10      28       3
+CTETRA       107       0       6      13      25      33
+CTETRA       108       0      16      32      27       9
+CTETRA       109       0      21      22      23      26
+CTETRA       110       0      27      19      17      32
+CTETRA       111       0      27      32      17       9
+CTETRA       112       0      16      21      27      32
+CTETRA       113       0      19      25      33       6
+CTETRA       114       0      24      27      22      33
+CTETRA       115       0      23      19      33      27
+CTETRA       116       0      19       6      33      24
+$
+$HMMOVE        1
+$             54THRU         116
+$$
+$$  GRID Data
+$$
+GRID           1        1.0     -2.45-160.0
+GRID           2        1.0     -2.45-161.0
+GRID           3        .7071068.70710680.0
+GRID           4        2.06-15 1.0     0.0
+GRID           5        -.707107.70710680.0
+GRID           6        -1.0    9.004-150.0
+GRID           7        -.707107-.7071070.0
+GRID           8        8.698-15-1.0    0.0
+GRID           9        .7071068-.7071070.0
+GRID          10        .7071068.70710681.0
+GRID          11        2.06-15 1.0     1.0
+GRID          12        -.707107.70710681.0
+GRID          13        -1.0    9.004-151.0
+GRID          14        -.707107-.7071071.0
+GRID          15        8.698-15-1.0    1.0
+GRID          16        .7071068-.7071071.0
+GRID          17        .3254219-6.154-20.0
+GRID          18        9.8468-2.35124360.0
+GRID          19        -0.14533-.2592060.0
+GRID          20        -.0442730.2844711.0
+GRID          21        .3224226-.2460451.0
+GRID          22        -.169874-.2417461.0
+GRID          23        -5.965-2-.291461.5227236
+GRID          24        -.412743.1771685.4583333
+GRID          25        -.271964-.345838.4791667
+GRID          26        .1950392-.464081.4583333
+GRID          27        .2936736-.1216440.5
+GRID          28        .4547628.1859033.5416667
+GRID          29        -4.085-20.440721.4791667
+GRID          30        -.247058.3278403.4868056
+GRID          31        .2479088.3405819.5163716
+GRID          32        .2528394-.303703.4738152
+GRID          33        -0.35812-7.943-2.4813956
+$
+$$------------------------------------------------------------------------------$
+$$    HyperMesh name and color information for generic components               $
+$$------------------------------------------------------------------------------$
+$HMNAME COMP                   1"misc1"
+$HWCOLOR COMP                  1      11
+$
+
+$
+
+$
+$$
+$$------------------------------------------------------------------------------$
+$$ HyperMesh Commands for loadcollectors name and color information $
+$$------------------------------------------------------------------------------$
+ENDDATA
+$$
+$$------------------------------------------------------------------------------$$
+$$        Data Definition for AutoDV                                            $$
+$$------------------------------------------------------------------------------$$
+$$
+$$-----------------------------------------------------------------------------$$
+$$        Design Variables Card for Control Perturbations                      $$
+$$-----------------------------------------------------------------------------$$
+$$
+$$------------------------------------------------------------------------------$
+$$        Domain Element Definitions                                            $
+$$------------------------------------------------------------------------------$
+$$
+$$------------------------------------------------------------------------------$$
+$$            Control Perturbation                                              $$
+$$------------------------------------------------------------------------------$$

test/data/meshio_meshes/netgen/periodic_1d.vol

@@ -0,0 +1,144 @@
+# Generated by NETGEN v6.2.2103-39-g3165e042
+
+mesh3d
+dimension
+1
+geomtype
+0
+
+# surfnr    bcnr   domin  domout      np      p1      p2      p3
+surfaceelements
+0
+
+
+#  matnr      np      p1      p2      p3      p4
+volumeelements
+0
+
+
+# surfid  0   p1   p2   trignum1    trignum2   domin/surfnr1    domout/surfnr2   ednr1   dist1   ednr2   dist2 
+edgesegmentsgi2
+50
+       1       0       1       2       -1       -1       -1       -1        1            0        1            0
+       1       0       2       3       -1       -1       -1       -1        1            0        1            0
+       1       0       3       4       -1       -1       -1       -1        1            0        1            0
+       1       0       4       5       -1       -1       -1       -1        1            0        1            0
+       1       0       5       6       -1       -1       -1       -1        1            0        1            0
+       1       0       6       7       -1       -1       -1       -1        1            0        1            0
+       1       0       7       8       -1       -1       -1       -1        1            0        1            0
+       1       0       8       9       -1       -1       -1       -1        1            0        1            0
+       1       0       9      10       -1       -1       -1       -1        1            0        1            0
+       1       0      10      11       -1       -1       -1       -1        1            0        1            0
+       1       0      11      12       -1       -1       -1       -1        1            0        1            0
+       1       0      12      13       -1       -1       -1       -1        1            0        1            0
+       1       0      13      14       -1       -1       -1       -1        1            0        1            0
+       1       0      14      15       -1       -1       -1       -1        1            0        1            0
+       1       0      15      16       -1       -1       -1       -1        1            0        1            0
+       1       0      16      17       -1       -1       -1       -1        1            0        1            0
+       1       0      17      18       -1       -1       -1       -1        1            0        1            0
+       1       0      18      19       -1       -1       -1       -1        1            0        1            0
+       1       0      19      20       -1       -1       -1       -1        1            0        1            0
+       1       0      20      21       -1       -1       -1       -1        1            0        1            0
+       1       0      21      22       -1       -1       -1       -1        1            0        1            0
+       1       0      22      23       -1       -1       -1       -1        1            0        1            0
+       1       0      23      24       -1       -1       -1       -1        1            0        1            0
+       1       0      24      25       -1       -1       -1       -1        1            0        1            0
+       1       0      25      26       -1       -1       -1       -1        1            0        1            0
+       1       0      26      27       -1       -1       -1       -1        1            0        1            0
+       1       0      27      28       -1       -1       -1       -1        1            0        1            0
+       1       0      28      29       -1       -1       -1       -1        1            0        1            0
+       1       0      29      30       -1       -1       -1       -1        1            0        1            0
+       1       0      30      31       -1       -1       -1       -1        1            0        1            0
+       1       0      31      32       -1       -1       -1       -1        1            0        1            0
+       1       0      32      33       -1       -1       -1       -1        1            0        1            0
+       1       0      33      34       -1       -1       -1       -1        1            0        1            0
+       1       0      34      35       -1       -1       -1       -1        1            0        1            0
+       1       0      35      36       -1       -1       -1       -1        1            0        1            0
+       1       0      36      37       -1       -1       -1       -1        1            0        1            0
+       1       0      37      38       -1       -1       -1       -1        1            0        1            0
+       1       0      38      39       -1       -1       -1       -1        1            0        1            0
+       1       0      39      40       -1       -1       -1       -1        1            0        1            0
+       1       0      40      41       -1       -1       -1       -1        1            0        1            0
+       1       0      41      42       -1       -1       -1       -1        1            0        1            0
+       1       0      42      43       -1       -1       -1       -1        1            0        1            0
+       1       0      43      44       -1       -1       -1       -1        1            0        1            0
+       1       0      44      45       -1       -1       -1       -1        1            0        1            0
+       1       0      45      46       -1       -1       -1       -1        1            0        1            0
+       1       0      46      47       -1       -1       -1       -1        1            0        1            0
+       1       0      47      48       -1       -1       -1       -1        1            0        1            0
+       1       0      48      49       -1       -1       -1       -1        1            0        1            0
+       1       0      49      50       -1       -1       -1       -1        1            0        1            0
+       1       0      50      51       -1       -1       -1       -1        1            0        1            0
+
+
+#          X             Y             Z
+points
+51
+    0.0000000000000000      0.0000000000000000      0.0000000000000000
+    0.0200000000000000      0.0000000000000000      0.0000000000000000
+    0.0400000000000000      0.0000000000000000      0.0000000000000000
+    0.0600000000000000      0.0000000000000000      0.0000000000000000
+    0.0800000000000000      0.0000000000000000      0.0000000000000000
+    0.1000000000000000      0.0000000000000000      0.0000000000000000
+    0.1200000000000000      0.0000000000000000      0.0000000000000000
+    0.1400000000000000      0.0000000000000000      0.0000000000000000
+    0.1600000000000000      0.0000000000000000      0.0000000000000000
+    0.1800000000000000      0.0000000000000000      0.0000000000000000
+    0.2000000000000000      0.0000000000000000      0.0000000000000000
+    0.2200000000000000      0.0000000000000000      0.0000000000000000
+    0.2400000000000000      0.0000000000000000      0.0000000000000000
+    0.2600000000000000      0.0000000000000000      0.0000000000000000
+    0.2800000000000000      0.0000000000000000      0.0000000000000000
+    0.3000000000000000      0.0000000000000000      0.0000000000000000
+    0.3200000000000000      0.0000000000000000      0.0000000000000000
+    0.3400000000000000      0.0000000000000000      0.0000000000000000
+    0.3600000000000000      0.0000000000000000      0.0000000000000000
+    0.3800000000000000      0.0000000000000000      0.0000000000000000
+    0.4000000000000000      0.0000000000000000      0.0000000000000000
+    0.4200000000000000      0.0000000000000000      0.0000000000000000
+    0.4400000000000000      0.0000000000000000      0.0000000000000000
+    0.4600000000000000      0.0000000000000000      0.0000000000000000
+    0.4800000000000000      0.0000000000000000      0.0000000000000000
+    0.5000000000000000      0.0000000000000000      0.0000000000000000
+    0.5200000000000000      0.0000000000000000      0.0000000000000000
+    0.5400000000000000      0.0000000000000000      0.0000000000000000
+    0.5600000000000001      0.0000000000000000      0.0000000000000000
+    0.5800000000000000      0.0000000000000000      0.0000000000000000
+    0.6000000000000000      0.0000000000000000      0.0000000000000000
+    0.6200000000000000      0.0000000000000000      0.0000000000000000
+    0.6400000000000000      0.0000000000000000      0.0000000000000000
+    0.6600000000000000      0.0000000000000000      0.0000000000000000
+    0.6800000000000000      0.0000000000000000      0.0000000000000000
+    0.7000000000000000      0.0000000000000000      0.0000000000000000
+    0.7200000000000000      0.0000000000000000      0.0000000000000000
+    0.7400000000000000      0.0000000000000000      0.0000000000000000
+    0.7600000000000000      0.0000000000000000      0.0000000000000000
+    0.7800000000000000      0.0000000000000000      0.0000000000000000
+    0.8000000000000000      0.0000000000000000      0.0000000000000000
+    0.8200000000000000      0.0000000000000000      0.0000000000000000
+    0.8400000000000000      0.0000000000000000      0.0000000000000000
+    0.8600000000000000      0.0000000000000000      0.0000000000000000
+    0.8800000000000000      0.0000000000000000      0.0000000000000000
+    0.9000000000000000      0.0000000000000000      0.0000000000000000
+    0.9200000000000000      0.0000000000000000      0.0000000000000000
+    0.9399999999999999      0.0000000000000000      0.0000000000000000
+    0.9600000000000000      0.0000000000000000      0.0000000000000000
+    0.9800000000000000      0.0000000000000000      0.0000000000000000
+    1.0000000000000000      0.0000000000000000      0.0000000000000000
+
+
+#          pnum             index
+pointelements
+2
+       1         1
+      51         2
+identifications
+1
+       1      51       1
+identificationtypes
+1
+ 2
+
+
+endmesh
+

test/data/meshio_meshes/netgen/periodic_2d.vol

@@ -0,0 +1,194 @@
+# Generated by NETGEN v6.2.2103-39-g3165e042
+
+mesh3d
+dimension
+2
+geomtype
+0
+
+# surfnr    bcnr   domin  domout      np      p1      p2      p3
+surfaceelements
+58
+ 2 1 0 0 3 1 5 17
+ 2 1 0 0 3 5 6 21
+ 2 1 0 0 3 6 7 22
+ 2 1 0 0 3 6 22 21
+ 2 1 0 0 3 7 8 23
+ 2 1 0 0 3 7 23 22
+ 2 1 0 0 3 2 24 8
+ 2 1 0 0 3 8 24 23
+ 2 1 0 0 3 2 9 24
+ 2 1 0 0 3 9 10 25
+ 2 1 0 0 3 9 25 24
+ 2 1 0 0 3 10 11 26
+ 2 1 0 0 3 10 26 25
+ 2 1 0 0 3 11 12 27
+ 2 1 0 0 3 11 27 26
+ 2 1 0 0 3 3 13 12
+ 2 1 0 0 3 13 14 28
+ 2 1 0 0 3 14 15 29
+ 2 1 0 0 3 14 29 28
+ 2 1 0 0 3 15 16 30
+ 2 1 0 0 3 15 30 29
+ 2 1 0 0 3 4 31 16
+ 2 1 0 0 3 16 31 30
+ 2 1 0 0 3 4 20 31
+ 2 1 0 0 3 17 32 18
+ 2 1 0 0 3 18 33 19
+ 2 1 0 0 3 18 32 33
+ 2 1 0 0 3 19 34 20
+ 2 1 0 0 3 20 34 31
+ 2 1 0 0 3 19 33 34
+ 2 1 0 0 3 12 13 27
+ 2 1 0 0 3 13 28 27
+ 2 1 0 0 3 5 21 17
+ 2 1 0 0 3 22 23 35
+ 2 1 0 0 3 21 22 36
+ 2 1 0 0 3 22 35 36
+ 2 1 0 0 3 26 27 37
+ 2 1 0 0 3 27 28 37
+ 2 1 0 0 3 23 24 25
+ 2 1 0 0 3 23 25 35
+ 2 1 0 0 3 30 31 38
+ 2 1 0 0 3 31 34 38
+ 2 1 0 0 3 29 30 38
+ 2 1 0 0 3 28 29 39
+ 2 1 0 0 3 28 39 37
+ 2 1 0 0 3 29 38 39
+ 2 1 0 0 3 17 21 32
+ 2 1 0 0 3 21 36 32
+ 2 1 0 0 3 25 26 40
+ 2 1 0 0 3 32 36 33
+ 2 1 0 0 3 26 37 40
+ 2 1 0 0 3 33 38 34
+ 2 1 0 0 3 33 36 38
+ 2 1 0 0 3 25 40 35
+ 2 1 0 0 3 36 39 38
+ 2 1 0 0 3 35 39 36
+ 2 1 0 0 3 35 40 39
+ 2 1 0 0 3 37 39 40
+
+
+#  matnr      np      p1      p2      p3      p4
+volumeelements
+0
+
+
+# surfid  0   p1   p2   trignum1    trignum2   domin/surfnr1    domout/surfnr2   ednr1   dist1   ednr2   dist2 
+edgesegmentsgi2
+20
+       1       0       1       5       -1       -1        1        0        1            0        1          0.2
+       1       0       5       6       -1       -1        1        0        1          0.2        1          0.4
+       1       0       6       7       -1       -1        1        0        1          0.4        1          0.6
+       1       0       7       8       -1       -1        1        0        1          0.6        1          0.8
+       1       0       8       2       -1       -1        1        0        1          0.8        1            1
+       2       0       2       9       -1       -1        1        0        2            0        2          0.2
+       2       0       9      10       -1       -1        1        0        2          0.2        2          0.4
+       2       0      10      11       -1       -1        1        0        2          0.4        2          0.6
+       2       0      11      12       -1       -1        1        0        2          0.6        2          0.8
+       2       0      12       3       -1       -1        1        0        2          0.8        2            1
+       3       0       3      13       -1       -1        1        0        3            0        3          0.2
+       3       0      13      14       -1       -1        1        0        3          0.2        3          0.4
+       3       0      14      15       -1       -1        1        0        3          0.4        3          0.6
+       3       0      15      16       -1       -1        1        0        3          0.6        3          0.8
+       3       0      16       4       -1       -1        1        0        3          0.8        3            1
+       4       0       1      17       -1       -1        0        1        4            0        4          0.2
+       4       0      17      18       -1       -1        0        1        4          0.2        4          0.4
+       4       0      18      19       -1       -1        0        1        4          0.4        4          0.6
+       4       0      19      20       -1       -1        0        1        4          0.6        4          0.8
+       4       0      20       4       -1       -1        0        1        4          0.8        4            1
+
+
+#          X             Y             Z
+points
+40
+    0.0000000000000000      0.0000000000000000      0.0000000000000000
+    1.0000000000000000      0.0000000000000000      0.0000000000000000
+    1.0000000000000000      1.0000000000000000      0.0000000000000000
+    0.0000000000000000      1.0000000000000000      0.0000000000000000
+    0.2000000000000000      0.0000000000000000      0.0000000000000000
+    0.4000000000000000      0.0000000000000000      0.0000000000000000
+    0.6000000000000000      0.0000000000000000      0.0000000000000000
+    0.8000000000000000      0.0000000000000000      0.0000000000000000
+    1.0000000000000000      0.2000000000000000      0.0000000000000000
+    1.0000000000000000      0.4000000000000000      0.0000000000000000
+    1.0000000000000000      0.6000000000000000      0.0000000000000000
+    1.0000000000000000      0.8000000000000000      0.0000000000000000
+    0.7999999999999999      1.0000000000000000      0.0000000000000000
+    0.6000000000000000      1.0000000000000000      0.0000000000000000
+    0.4000000000000000      1.0000000000000000      0.0000000000000000
+    0.2000000000000000      1.0000000000000000      0.0000000000000000
+    0.0000000000000000      0.2000000000000000      0.0000000000000000
+    0.0000000000000000      0.4000000000000000      0.0000000000000000
+    0.0000000000000000      0.6000000000000000      0.0000000000000000
+    0.0000000000000000      0.8000000000000000      0.0000000000000000
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+    0.3154224090519101      0.6697496604451058      0.0000000000000000
+    0.5278793480475702      0.5943130585988371      0.0000000000000000
+    0.6923017137632204      0.4803955670550934      0.0000000000000000
+
+
+#          pnum             index
+pointelements
+4
+       1         1
+       2         2
+       3         3
+       4         4
+identifications
+6
+       2       1       4
+       3       4       4
+       9      17       4
+      10      18       4
+      11      19       4
+      12      20       4
+identificationtypes
+4
+ 1 1 1 2
+
+
+bcnames
+4
+1	outer
+2	periodic
+3	outer
+4	periodic
+
+
+
+
+cd2names
+4
+1	
+2	
+3	
+4	
+
+
+
+
+#   Surfnr     Red     Green     Blue
+face_colours
+1
+       2   0.00000000   1.00000000   0.00000000
+
+
+endmesh
+

test/data/meshio_meshes/netgen/periodic_3d.vol

@@ -0,0 +1,506 @@
+# Generated by NETGEN v6.2.2103-39-g3165e042
+
+mesh3d
+dimension
+3
+geomtype
+0
+
+# surfnr    bcnr   domin  domout      np      p1      p2      p3
+surfaceelements
+108
+ 1 1 1 0 3 1 9 32
+ 1 1 1 0 3 9 10 33
+ 1 1 1 0 3 4 34 10
+ 1 1 1 0 3 10 34 33
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+ 1 1 1 0 3 11 31 35
+ 1 1 1 0 3 31 33 35
+ 1 1 1 0 3 33 37 35
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+ 7 2 1 0 3 4 10 16
+ 3 6 1 0 3 49 53 50
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+ 7 2 1 0 3 6 15 26
+ 7 2 1 0 3 15 16 39
+ 7 2 1 0 3 15 39 26
+ 3 6 1 0 3 51 52 53
+ 7 2 1 0 3 2 25 21
+ 7 2 1 0 3 21 40 22
+ 7 2 1 0 3 25 26 39
+ 7 2 1 0 3 9 22 40
+ 7 2 1 0 3 21 25 40
+ 7 2 1 0 3 25 39 40
+ 7 2 1 0 3 9 40 38
+ 7 2 1 0 3 16 38 39
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+ 4 4 1 0 3 7 42 14
+ 4 4 1 0 3 14 42 41
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+ 4 4 1 0 3 43 45 44
+ 4 4 1 0 3 41 42 45
+ 4 4 1 0 3 15 18 43
+ 4 4 1 0 3 17 41 18
+ 4 4 1 0 3 18 41 43
+ 4 4 1 0 3 41 45 43
+ 2 5 1 0 3 8 17 24
+ 2 5 1 0 3 17 18 46
+ 2 5 1 0 3 6 26 18
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+ 3 6 1 0 3 31 50 53
+ 2 5 1 0 3 5 23 47
+ 2 5 1 0 3 23 24 47
+ 2 5 1 0 3 2 30 25
+ 2 5 1 0 3 25 48 26
+ 2 5 1 0 3 25 30 48
+ 2 5 1 0 3 5 47 29
+ 2 5 1 0 3 29 48 30
+ 2 5 1 0 3 17 46 24
+ 2 5 1 0 3 29 47 48
+ 2 5 1 0 3 24 46 47
+ 2 5 1 0 3 46 48 47
+ 3 6 1 0 3 32 53 52
+ 2 5 1 0 3 26 48 46
+ 3 6 1 0 3 5 29 19
+ 3 6 1 0 3 19 49 20
+ 3 6 1 0 3 3 20 50
+ 3 6 1 0 3 3 50 31
+ 3 6 1 0 3 20 49 50
+ 3 6 1 0 3 2 21 30
+ 3 6 1 0 3 21 22 51
+ 3 6 1 0 3 1 52 22
+ 3 6 1 0 3 22 52 51
+ 3 6 1 0 3 1 32 52
+ 3 6 1 0 3 21 51 30
+ 3 6 1 0 3 31 53 32
+ 8 3 1 0 3 3 11 20
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+ 8 3 1 0 3 7 14 12
+ 8 3 1 0 3 12 14 54
+ 8 3 1 0 3 8 24 13
+ 8 3 1 0 3 13 55 14
+ 8 3 1 0 3 13 24 55
+ 8 3 1 0 3 5 19 23
+ 8 3 1 0 3 19 20 56
+ 8 3 1 0 3 23 55 24
+ 8 3 1 0 3 11 56 20
+ 8 3 1 0 3 19 56 23
+ 8 3 1 0 3 23 56 55
+ 8 3 1 0 3 11 54 56
+ 8 3 1 0 3 14 55 54
+ 8 3 1 0 3 54 55 56
+
+
+#  matnr      np      p1      p2      p3      p4
+volumeelements
+166
+1 4 33 57 59 61
+1 4 12 14 54 36
+1 4 33 38 59 57
+1 4 21 40 51 60
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+1 4 1 9 65 22
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+1 4 24 46 47 64
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+1 4 21 30 60 51
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+1 4 38 39 59 40
+1 4 20 49 58 56
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+1 4 27 36 37 42
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+1 4 23 24 47 64
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+1 4 2 21 30 25
+1 4 24 41 46 64
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+1 4 19 29 49 63
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+1 4 20 49 50 58
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+1 4 31 33 58 53
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+1 4 28 34 45 37
+
+
+# surfid  0   p1   p2   trignum1    trignum2   domin/surfnr1    domout/surfnr2   ednr1   dist1   ednr2   dist2 
+edgesegmentsgi2
+72
+       1       0       1       9       -1       -1        1        7        1            0        0            0
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+       1       0       9      10       -1       -1        1        7        1            0        0            0
+       2       0      10       9       -1       -1        1        7        1            0        0            0
+       1       0      10       4       -1       -1        1        7        1            0        0            0
+       2       0       4      10       -1       -1        1        7        1            0        0            0
+       1       0      11       3       -1       -1        8        1        2            0        0            0
+       3       0       3      11       -1       -1        8        1        2            0        0            0
+       1       0      12      11       -1       -1        8        1        2            0        0            0
+       3       0      11      12       -1       -1        8        1        2            0        0            0
+       1       0       7      12       -1       -1        8        1        2            0        0            0
+       3       0      12       7       -1       -1        8        1        2            0        0            0
+       4       0       8      13       -1       -1        4        8        3            0        0            0
+       3       0      13       8       -1       -1        4        8        3            0        0            0
+       4       0      13      14       -1       -1        4        8        3            0        0            0
+       3       0      14      13       -1       -1        4        8        3            0        0            0
+       4       0      14       7       -1       -1        4        8        3            0        0            0
+       3       0       7      14       -1       -1        4        8        3            0        0            0
+       4       0      15       6       -1       -1        7        4        4            0        0            0
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+       4       0      16      15       -1       -1        7        4        4            0        0            0
+       2       0      15      16       -1       -1        7        4        4            0        0            0
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+       1       0      27       7       -1       -1        4        1       10            0        0            0
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+       4       0      27      28       -1       -1        4        1       10            0        0            0
+       1       0       4      28       -1       -1        4        1       10            0        0            0
+       4       0      28       4       -1       -1        4        1       10            0        0            0
+       5       0      29       5       -1       -1        3        2       11            0        0            0
+       6       0       5      29       -1       -1        3        2       11            0        0            0
+       5       0      30      29       -1       -1        3        2       11            0        0            0
+       6       0      29      30       -1       -1        3        2       11            0        0            0
+       5       0       2      30       -1       -1        3        2       11            0        0            0
+       6       0      30       2       -1       -1        3        2       11            0        0            0
+       1       0       3      31       -1       -1        1        3       12            0        0            0
+       6       0      31       3       -1       -1        1        3       12            0        0            0
+       1       0      31      32       -1       -1        1        3       12            0        0            0
+       6       0      32      31       -1       -1        1        3       12            0        0            0
+       1       0      32       1       -1       -1        1        3       12            0        0            0
+       6       0       1      32       -1       -1        1        3       12            0        0            0
+
+
+#          X             Y             Z
+points
+65
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+    0.3333333333333332      1.0000000000000000      1.0000000000000000
+    1.0000000000000000      0.0000000000000000      0.6666666666666666
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+    0.0000000000000000      0.0000000000000000      0.6666666666666666
+    0.0000000000000000      0.0000000000000000      0.3333333333333332
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+    0.7299469195459262      0.2730082184471636      0.2789191388190804
+    0.3202369865656342      0.7063322531411742      0.4178510398137523
+    0.4187321713884653      0.2791900408384976      0.7467956942298275
+    0.6883019035327874      0.6532015011171384      0.3389153362395730
+    0.2848826858717337      0.6291905246270143      0.7492446890085234
+    0.7505520006346695      0.2364072052628841      0.7265283730519375
+    0.6904080728530597      0.5313023561184044      0.6778821530260029
+    0.2153574046463540      0.2182196460363049      0.2340094009251045
+
+
+#          pnum             index
+pointelements
+0
+identifications
+15
+       1       3       1
+       2       5       1
+       4       7       1
+       6       8       1
+       9      11       1
+      10      12       1
+      15      13       1
+      16      14       1
+      21      19       1
+      22      20       1
+      25      23       1
+      26      24       1
+      38      54       1
+      39      55       1
+      40      56       1
+identificationtypes
+1
+ 2
+
+
+bcnames
+6
+1	outer
+2	default
+3	default
+4	outer
+5	outer
+6	outer
+
+
+
+
+#   Surfnr     Red     Green     Blue
+face_colours
+6
+       1   0.00000000   1.00000000   0.00000000
+       7   0.00000000   1.00000000   0.00000000
+       8   0.00000000   1.00000000   0.00000000
+       4   0.00000000   1.00000000   0.00000000
+       2   0.00000000   1.00000000   0.00000000
+       3   0.00000000   1.00000000   0.00000000
+
+
+endmesh
+
+csgsurfaces 8
+plane 6
+-1.00000000 0.00000000 0.00000000 0.00000000 0.00000000 -1.00000000 
+plane 6
+-1.00000000 0.00000000 1.00000000 0.00000000 0.00000000 1.00000000 
+plane 6
+-1.00000000 0.00000000 0.00000000 0.00000000 -1.00000000 0.00000000 
+plane 6
+-1.00000000 1.00000000 0.00000000 0.00000000 1.00000000 0.00000000 
+plane 6
+-1.00000000 0.00000000 0.00000000 -1.00000000 0.00000000 0.00000000 
+plane 6
+2.00000000 0.00000000 0.00000000 1.00000000 0.00000000 0.00000000 
+plane 6
+0.00000000 0.00000000 0.00000000 -1.00000000 0.00000000 0.00000000 
+plane 6
+1.00000000 0.00000000 0.00000000 1.00000000 0.00000000 0.00000000 

test/data/meshio_meshes/ply/tet.ply

@@ -0,0 +1,22 @@
+ply
+format ascii 1.0
+comment single tetrahedron with colored faces
+element vertex 4
+comment tetrahedron vertices
+property float x
+property float y
+property float z
+element face 4
+property list uchar int vertex_indices
+property uchar red
+property uchar green
+property uchar blue
+end_header
+0 0 0
+0 1 1
+1 0 1
+1 1 0
+3 0 1 2 255 255 255
+3 0 2 3 255 0 0
+3 0 1 3 0 255 0
+3 1 2 3 0 0 255

test/data/meshio_meshes/su2/README.md

@@ -0,0 +1,2 @@
+* `square.su2` : from https://su2code.github.io/docs_v7/Mesh-File/
+* `mixgrid.su2` : generated using http://ossanworld.com/cfdbooks/cfdcodes/mixgrid_cube_v5.f90

test/data/meshio_meshes/su2/mixgrid.su2

@@ -0,0 +1,73 @@
+ %
+ % Problem dimension
+ %
+NDIME=            3
+ %
+ % Inner element connectivity
+NELEM=           10
+                  10                   2                   6                   3                  11                   0
+                  10                   6                   7                   3                  11                   1
+                  10                  14                  10                  11                   6                   2
+                  10                  14                  11                  15                   6                   3
+                  10                   2                  10                   6                  11                   4
+                  10                   6                  15                   7                  11                   5
+                  13                   4                   8                   0                   5                   9                   1                   6
+                  13                  12                   8                   4                  13                   9                   5                   7
+                  13                   5                   9                   1                   6                  10                   2                   8
+                  13                  13                   9                   5                  14                  10                   6                   9
+ %
+ % Node coordinates
+ %
+NPOIN=           16
+     0.000000000000000E+00     0.000000000000000E+00     0.000000000000000E+00
+     0.000000000000000E+00     0.000000000000000E+00     1.500000000000000E-01
+     0.000000000000000E+00     0.000000000000000E+00     3.000000000000000E-01
+     0.000000000000000E+00     0.000000000000000E+00     1.000000000000000E+00
+     0.000000000000000E+00     1.000000000000000E+00     0.000000000000000E+00
+     0.000000000000000E+00     1.000000000000000E+00     1.500000000000000E-01
+     0.000000000000000E+00     1.000000000000000E+00     3.000000000000000E-01
+     0.000000000000000E+00     1.000000000000000E+00     1.000000000000000E+00
+     1.000000000000000E+00     0.000000000000000E+00     0.000000000000000E+00
+     1.000000000000000E+00     0.000000000000000E+00     1.500000000000000E-01
+     1.000000000000000E+00     0.000000000000000E+00     3.000000000000000E-01
+     1.000000000000000E+00     0.000000000000000E+00     1.000000000000000E+00
+     1.000000000000000E+00     1.000000000000000E+00     0.000000000000000E+00
+     1.000000000000000E+00     1.000000000000000E+00     1.500000000000000E-01
+     1.000000000000000E+00     1.000000000000000E+00     3.000000000000000E-01
+     1.000000000000000E+00     1.000000000000000E+00     1.000000000000000E+00
+ %
+ % Boundary elements
+ %
+NMARK=            6
+MARKER_TAG= xmin
+MARKER_ELEMS=            4
+                   5                   6                   7                   3
+                   5                   6                   3                   2
+                   9                   0                   4                   5                   1
+                   9                   1                   5                   6                   2
+MARKER_TAG= xmax
+MARKER_ELEMS=            4
+                   5                  14                  10                  11
+                   5                  14                  11                  15
+                   9                  12                   8                   9                  13
+                   9                  13                   9                  10                  14
+MARKER_TAG= ymin
+MARKER_ELEMS=            4
+                   5                   2                   3                  11
+                   5                   2                  11                  10
+                   9                   8                   0                   1                   9
+                   9                   9                   1                   2                  10
+MARKER_TAG= ymax
+MARKER_ELEMS=            4
+                   5                   6                  14                  15
+                   5                   6                  15                   7
+                   9                   4                  12                  13                   5
+                   9                   5                  13                  14                   6
+MARKER_TAG= zmin
+MARKER_ELEMS=            2
+                   5                   4                   0                   8
+                   5                   4                   8                  12
+MARKER_TAG= zmax
+MARKER_ELEMS=            2
+                   5                   7                  15                  11
+                   5                   7                  11                   3

test/data/meshio_meshes/su2/square.su2

@@ -0,0 +1,49 @@
+%
+% Problem dimension
+%
+NDIME= 2
+%
+% Inner element connectivity
+%
+NELEM= 8
+5 	 0 	 1 	 3 	 0
+5 	 1 	 4 	 3 	 1
+5 	 1 	 2 	 4 	 2
+5 	 2 	 5 	 4 	 3
+5 	 3 	 4 	 6 	 4
+5 	 4 	 7 	 6 	 5
+5 	 4 	 5 	 7 	 6
+5 	 5 	 8 	 7 	 7
+%
+% Node coordinates
+%
+NPOIN= 9
+0.00000000000000 	 0.00000000000000 	 0
+0.50000000000000 	 0.00000000000000 	 1
+1.00000000000000 	 0.00000000000000 	 2
+0.00000000000000 	 0.50000000000000 	 3
+0.50000000000000 	 0.50000000000000 	 4
+1.00000000000000 	 0.50000000000000 	 5
+0.00000000000000 	 1.00000000000000 	 6
+0.50000000000000 	 1.00000000000000 	 7
+1.00000000000000 	 1.00000000000000 	 8
+%
+% Boundary elements
+%
+NMARK= 4
+MARKER_TAG= lower
+MARKER_ELEMS= 2
+3 	 0 	 1
+3 	 1 	 2
+MARKER_TAG= right
+MARKER_ELEMS= 2
+3 	 2 	 5
+3 	 5 	 8
+MARKER_TAG= upper
+MARKER_ELEMS= 2
+3 	 8 	 7
+3 	 7 	 6
+MARKER_TAG= left
+MARKER_ELEMS= 2
+3 	 6 	 3
+3 	 3 	 0

test/data/meshio_meshes/tecplot/quad_zone_comma.tec

@@ -0,0 +1,14 @@
+TITLE = "Zone and variables separated by commas"
+VARIABLES = X, Y, "foo bar",  foobar
+# Random comment
+ZONE N=4, E =1,ET= QUADRILATERAL , T = "Hex with commas"
+# Random comment
+,   F = FEBLOCK, VARLOCATION  =(  [4]= CELLCENTERED )
+ 0.0 1.0 1.0 0.0
+ 0.0 0.0 1.0 1.0
+# Random comment
+ 1.0 2.0 3.0 4.0
+# Random comment
+ 42.0
+# Random comment
+ 1 2 3 4

test/data/meshio_meshes/tecplot/quad_zone_multivar.tec

@@ -0,0 +1,16 @@
+TITLE = "Zone and variables separated by commas"
+VARIABLES = "X", "Y",
+"foo bar",
+"foobar"
+# Random comment
+ZONE N=4, E =1,ET= QUADRILATERAL , T = "Hex with commas"
+# Random comment
+,   F = FEBLOCK, VARLOCATION  =(  [4]= CELLCENTERED )
+ 0.0 1.0 1.0 0.0
+ 0.0 0.0 1.0 1.0
+# Random comment
+ 1.0 2.0 3.0 4.0
+# Random comment
+ 42.0
+# Random comment
+ 1 2 3 4

test/data/meshio_meshes/tecplot/quad_zone_space.tec

@@ -0,0 +1,14 @@
+TITLE = "Zone and variables separated by white spaces"
+VARIABLES = X Y "foo bar"  foobar
+# Random comment
+ZONE T = "VARLOCATION" N=4 E =1 ET= QUADRILATERAL
+# Random comment
+   F = FEBLOCK VARLOCATION  =(  [4]= CELLCENTERED )
+ 0.0 1.0 1.0 0.0
+ 0.0 0.0 1.0 1.0
+# Random comment
+ 1.0 2.0 3.0 4.0
+# Random comment
+ 42.0
+# Random comment
+ 1 2 3 4

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test/data/meshio_meshes/ugrid/pyra_cube.ugrid

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test/data/meshio_meshes/vtk/00_image.vtk

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test/data/meshio_meshes/vtk/01_image.vtk

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test/data/meshio_meshes/vtk/02_structured.vtk

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test/data/meshio_meshes/vtk/03_rectilinear.vtk

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test/data/meshio_meshes/vtk/04_rectilinear.vtk

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+0.4214370932 0.19047900181 0.51820664038 0.77471790134 0.60592653466 0.81065380638 0.62617898509 0.38810685582 0.1126304294 
+0.20460114912 0.54238177923 0.81393995793 0.96197048162 0.4422555548 0.2418563543 0.1052903392 0.48388728482 0.4595709923 
+0.20135841829 0.89066770205 0.34317565499 0.65652281351 
+METADATA
+INFORMATION 0
+

test/data/meshio_meshes/vtk/05_rectilinear.vtk

@@ -0,0 +1,50 @@
+# vtk DataFile Version 4.2
+vtk output
+ASCII
+DATASET RECTILINEAR_GRID
+DIMENSIONS 10 1 4
+X_COORDINATES 10 double
+0 0.11111111111 0.22222222222 0.33333333333 0.44444444444 0.55555555556 0.66666666667 0.77777777778 0.88888888889 
+1 
+Y_COORDINATES 1 double
+0 
+Z_COORDINATES 4 double
+0 0.66666666667 1.3333333333 2 
+CELL_DATA 27
+FIELD FieldData 2
+pressure1 1 27 double
+0.23241625202 0.11445560209 0.76365154653 0.47087525569 0.72431649469 0.92392403459 0.77855368618 0.84124534651 0.23006099738 
+0.072055527286 0.54402393208 0.76577680989 0.95543852626 0.5500200629 0.87894640567 0.1649442032 0.015127389286 0.91713330418 
+0.88199809591 0.67635433792 0.022145891361 0.27235031166 0.2517931659 0.23538443475 0.83078337459 0.12698638054 0.32136110723 
+
+METADATA
+INFORMATION 0
+
+pressure2 1 27 double
+0.23241625202 0.11445560209 0.76365154653 0.47087525569 0.72431649469 0.92392403459 0.77855368618 0.84124534651 0.23006099738 
+0.072055527286 0.54402393208 0.76577680989 0.95543852626 0.5500200629 0.87894640567 0.1649442032 0.015127389286 0.91713330418 
+0.88199809591 0.67635433792 0.022145891361 0.27235031166 0.2517931659 0.23538443475 0.83078337459 0.12698638054 0.32136110723 
+
+METADATA
+INFORMATION 0
+
+POINT_DATA 40
+FIELD FieldData 2
+temp1 1 40 double
+0.63326220102 0.65880449811 0.092134010247 0.26224177577 0.18028495303 0.45655723881 0.75424083555 0.25092637201 0.42578021015 
+0.34947513336 0.80900439304 0.10986986982 0.79435528494 0.040592168323 0.34699882279 0.64743497427 0.77190625479 0.87132637738 
+0.85488395442 0.68169002004 0.479460097 0.44164793037 0.42271564266 0.60839199607 0.16007533174 0.11289515092 0.72833184529 
+0.067663762988 0.86608996337 0.30484964892 0.96540154884 0.94371142461 0.14854998865 0.66201000286 0.29212325327 0.088839789059 
+0.94721379534 0.16104719752 0.21336087397 0.98095779109 
+METADATA
+INFORMATION 0
+
+temp2 1 40 double
+0.63326220102 0.65880449811 0.092134010247 0.26224177577 0.18028495303 0.45655723881 0.75424083555 0.25092637201 0.42578021015 
+0.34947513336 0.80900439304 0.10986986982 0.79435528494 0.040592168323 0.34699882279 0.64743497427 0.77190625479 0.87132637738 
+0.85488395442 0.68169002004 0.479460097 0.44164793037 0.42271564266 0.60839199607 0.16007533174 0.11289515092 0.72833184529 
+0.067663762988 0.86608996337 0.30484964892 0.96540154884 0.94371142461 0.14854998865 0.66201000286 0.29212325327 0.088839789059 
+0.94721379534 0.16104719752 0.21336087397 0.98095779109 
+METADATA
+INFORMATION 0
+

test/data/meshio_meshes/vtk/06_color_scalars.vtk

@@ -0,0 +1,23 @@
+# vtk DataFile Version 2.0
+data
+ASCII
+DATASET UNSTRUCTURED_GRID
+POINTS 5 float
+ 1.5  0.0  0.0 
+ 0.0  1.5  0.0 
+ 1.5  1.5  0.0 
+ 0.0  0.0  0.0 
+-1.5 -1.5  0.0 
+CELLS 2 7
+2 3 4
+3 0 1 2
+CELL_TYPES 2
+3
+5
+POINT_DATA 5
+COLOR_SCALARS lut 4
+1.0  0.0  0.0  1.0
+0.0  1.0  0.0  1.0
+0.0  0.0  1.0  1.0
+0.0  0.0  0.0  1.0
+0.0  0.0  0.0  1.0

test/data/meshio_meshes/vtk/06_unstructured.vtk

@@ -0,0 +1,64 @@
+# vtk DataFile Version 5.1
+vtk output
+ASCII
+DATASET UNSTRUCTURED_GRID
+POINTS 42 float
+1.3 0.8 0.4 1.4 0.8 0.4 1.4 0.9 0.4 
+1.3 0.9 0.4 1.3 0.8 0.5 1.4 0.8 0.5 
+1.4 0.9 0.5 1.3 0.9 0.5 1.5 0.8 0.4 
+1.5 0.9 0.4 1.5 0.8 0.5 1.5 0.9 0.5 
+1.3 0.9 0 1.4 0.9 0 1.4 1 0 
+1.3 1 0 1.3 0.9 0.1 1.4 0.9 0.1 
+1.4 1 0.1 1.3 1 0.1 1.3 0.9 0.2 
+1.4 0.9 0.2 1.4 1 0.2 1.3 1 0.2 
+1.3 0.9 0.3 1.4 0.9 0.3 1.4 1 0.3 
+1.3 1 0.3 1.4 1 0.4 1.3 1 0.4 
+1.4 1 0.5 1.3 1 0.5 1.5 0.9 0 
+1.5 1 0 1.5 0.9 0.1 1.5 1 0.1 
+1.5 0.9 0.2 1.5 1 0.2 1.5 0.9 0.3 
+1.5 1 0.3 1.5 1 0.4 1.5 1 0.5 
+
+CELLS 13 96
+OFFSETS vtktypeint64
+0 8 16 24 32 40 48 56 64 
+72 80 88 96 
+CONNECTIVITY vtktypeint64
+0 1 2 3 4 5 6 7 1 
+8 9 2 5 10 11 6 12 13 
+14 15 16 17 18 19 16 17 18 
+19 20 21 22 23 20 21 22 23 
+24 25 26 27 24 25 26 27 3 
+2 28 29 3 2 28 29 7 6 
+30 31 13 32 33 14 17 34 35 
+18 17 34 35 18 21 36 37 22 
+21 36 37 22 25 38 39 26 25 
+38 39 26 2 9 40 28 2 9 
+40 28 6 11 41 30 
+CELL_TYPES 12
+12
+12
+12
+12
+12
+12
+12
+12
+12
+12
+12
+12
+
+CELL_DATA 12
+SCALARS mat_id int
+LOOKUP_TABLE default
+2 2 1 1 1 1 2 1 1
+1 1 2
+
+POINT_DATA 42
+SCALARS node_groups int
+LOOKUP_TABLE default
+0 0 0 0 0 0 0 0 0
+0 0 0 1 1 1 1 0 0
+0 0 0 0 0 0 0 0 0
+0 0 0 0 0 1 1 0 0
+0 0 0 0 0 0

test/data/meshio_meshes/vtk/gh-935.vtk

@@ -0,0 +1,22 @@
+# vtk DataFile Version 3.0
+vtk output
+ASCII
+DATASET UNSTRUCTURED_GRID
+POINTS 6 float
+       0       1	 0.0
+       0       0	 0.0
+       1       0	 0.0
+       0       1	 0.0
+       1       0	 0.0
+       1       1	 0.0
+CELLS 2 8
+3	0	1	2	
+3	3	4	5	
+CELL_TYPES 2
+5 
+5 
+CELL_DATA 2
+POINT_DATA 6
+SCALARS sol float 2
+LOOKUP_TABLE default
+-1 1 -1 0 0 -0 0 0 0 0 0 0 

test/data/meshio_meshes/wkt/simple.wkt

@@ -0,0 +1 @@
+TIN (((0 0 0, 0 0 1, 0 1 0, 0 0 0)), ((0 0 0, 0 1 0, 1 1 0, 0 0 0)))

test/data/meshio_meshes/wkt/whitespaced.wkt

@@ -0,0 +1,4 @@
+    TIN (
+    ((0
+    0 0, 0 0.00 .1, 0. 0.1 0, 0 0 0)), (
+(       0 0   0    , 0 1 0, 1 1 0, 0 0 0)))

test/tests.set

@@ -131,6 +131,8 @@ SET(SESSION_FREE_TESTS
   doublenodes_polyhedra.py
   shaper_smesh_groups_without_session.py
   ssl_hdf5_symbols_conflicts.py
+  SMESH_MeshioShapes.py
+  SMESH_MeshioFiles.py
   )
 
 # Additional files to install (not tests)