PostProcBrokenMeshInMoabBase.hpp

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/**
 * @file PostProcBrokenMeshInMoabBase.hpp
 * @author your name (you@domain.com)
 * @brief
 * @version 0.1
 * @date 2022-09-14
 *
 * @copyright Copyright (c) 2022
 *
 */
 
#ifndef __POSTPROCBROKENMESHINMOABBASE_HPP
#define __POSTPROCBROKENMESHINMOABBASE_HPP
 
namespace MoFEM {
 
/**
 * Each element is subdivided on smaller elements, i.e. a reference mesh on
 * single element is created. Nodes of such reference mesh are used as
 * integration points at which field values are calculated and to
 * each node a "moab" tag is attached to store those values.
 */
struct PostProcGenerateRefMeshBase {
 
  std::vector<MatrixDouble>
      levelShapeFunctions; //< values of shape functions on refences element
                           // refinement levels
  std::vector<MatrixDouble>
      levelGaussPtsOnRefMesh; //< gauss points at refinement levels
  std::vector<ublas::matrix<int>> levelRef; //< connectivity at refinement level
 
  EntityHandle startingVertEleHandle;        //< starting handle of first vertex
  std::vector<double *> verticesOnEleArrays; //< array of vertices coordinate
  EntityHandle startingEleHandle; //< starting handle of first element
  EntityHandle *eleConn;          //< array of elements connectivity
 
  int countEle;     //< count elements
  int countVertEle; //< count vertices on the mesh
 
  int nbVertices; //< numer of vertices on the mesh
  int nbEles;     //< number of elements on the mesh
 
  PostProcGenerateRefMeshBase();
  virtual ~PostProcGenerateRefMeshBase() = default;
 
  virtual MoFEMErrorCode getOptions(std::string prefix); //< get options from command
  virtual MoFEMErrorCode generateReferenceElementMesh() = 0;
 
  PetscBool hoNodes;     //< if true mid nodes are added
  int defMaxLevel;       //< default max number of refinement levels
};
 
using PostProcGenerateRefMeshPtr =
    boost::shared_ptr<PostProcGenerateRefMeshBase>;
 
/**
 * @brief Element for postprocessing. Uses MoAB to generate post-processing
 * mesh.
 *
 * @tparam T Finite Element Implementation
 */
template <EntityType T> struct PostProcGenerateRefMesh;
 
template <>
struct PostProcGenerateRefMesh<MBTET> : public PostProcGenerateRefMeshBase {
  using PostProcGenerateRefMeshBase::PostProcGenerateRefMeshBase;
  MoFEMErrorCode generateReferenceElementMesh();
};
 
template <>
struct PostProcGenerateRefMesh<MBHEX> : public PostProcGenerateRefMeshBase {
  using PostProcGenerateRefMeshBase::PostProcGenerateRefMeshBase;
  MoFEMErrorCode generateReferenceElementMesh();
};
 
template <>
struct PostProcGenerateRefMesh<MBTRI> : public PostProcGenerateRefMeshBase {
  using PostProcGenerateRefMeshBase::PostProcGenerateRefMeshBase;
  MoFEMErrorCode generateReferenceElementMesh();
};
 
template <>
struct PostProcGenerateRefMesh<MBQUAD> : public PostProcGenerateRefMeshBase {
  using PostProcGenerateRefMeshBase::PostProcGenerateRefMeshBase;
  MoFEMErrorCode generateReferenceElementMesh();
};
 
template <>
struct PostProcGenerateRefMesh<MBEDGE> : public PostProcGenerateRefMeshBase {
  using PostProcGenerateRefMeshBase::PostProcGenerateRefMeshBase;
  MoFEMErrorCode generateReferenceElementMesh();
};
 
template <typename E> struct PostProcBrokenMeshInMoabBase : public E {
 
  PostProcBrokenMeshInMoabBase(MoFEM::Interface &m_field,
                               std::string opts_prefix = "");
  PostProcBrokenMeshInMoabBase(MoFEM::Interface &m_field,
                               boost::shared_ptr<moab::Core> core_mesh_ptr,
                               std::string opts_prefix = "");
 
  virtual ~PostProcBrokenMeshInMoabBase();
 
  /**
   * @brief Get vector of vectors associated to integration points
   *
   * @return std::vector<EntityHandle>&
   */
  inline auto &getMapGaussPts();
 
  /**
   * @brief Get postprocessing mesh
   *
   * @return moab::Interface&
   */
  inline auto &getPostProcMesh();
 
  /**
   * @brief Get postprocessing elements
   *
   * @return auto&
   */
  inline auto &getPostProcElements();
 
  /**
   * \brief wrote results in (MOAB) format, use "file_name.h5m"
   * @param  file_name file name (should always end with .h5m)
   * @return           error code
   * \ingroup mofem_fs_post_proc
  */
  MoFEMErrorCode writeFile(const std::string file_name);
 
  /**
   * @brief Set tags to be transferred to post-processing mesh
   * 
   * @param tags_to_transfer 
   * @return MoFEMErrorCode 
   */
  MoFEMErrorCode setTagsToTransfer(std::vector<Tag> tags_to_transfer);
 
protected:
 
  MoFEMErrorCode setGaussPts(int order);
 
  /**
   * @brief Generate vertices and elements
   *
   * @return MoFEMErrorCode
   */
  MoFEMErrorCode preProcess();
 
  MoFEMErrorCode postProcess();
  
  int getRule(int order);
 
  /**
   * @brief Determine refinement level based on fields approx ordre.
   *
   * level = (order - 1) / 2
   *
   * @return int
   */
  virtual int getMaxLevel() const;
 
  boost::shared_ptr<moab::Core> coreMeshPtr = boost::make_shared<moab::Core>();
 
  std::vector<EntityHandle> mapGaussPts;
  Range postProcElements;
 
  std::map<EntityType, PostProcGenerateRefMeshPtr>
      refElementsMap; ///< Storing data about element types, and data for
                      ///< ReadUtilIface to create element entities on
                      ///< post-process mesh.
  std::vector<Tag> tagsToTransfer; ///< Set of tags on mesh to transfer to
                                   ///< postprocessing mesh
  std::string optionsPrefix = "";  ///< Prefix for options
 
  virtual MoFEMErrorCode preProcPostProc();
  virtual MoFEMErrorCode postProcPostProc();
 
  virtual MoFEMErrorCode transferTags(); ///< transfer tags from mesh to
                                         ///< post-process mesh
};
 
template <typename E>
MoFEMErrorCode PostProcBrokenMeshInMoabBase<E>::setTagsToTransfer(
    std::vector<Tag> tags_to_transfer) {
  MoFEMFunctionBegin;
  tagsToTransfer.swap(tags_to_transfer);
  MoFEMFunctionReturn(0);
}
 
template <typename E> int PostProcBrokenMeshInMoabBase<E>::getMaxLevel() const {
  auto get_element_max_dofs_order = [&]() {
    int max_order = 0;
    auto dofs_vec = E::getDataVectorDofsPtr();
    for (auto &dof : *dofs_vec) {
      const int dof_order = dof->getDofOrder();
      max_order = (max_order < dof_order) ? dof_order : max_order;
    };
    return max_order;
  };
  const auto dof_max_order = get_element_max_dofs_order();
  return (dof_max_order > 0) ? (dof_max_order - 1) / 2 : 0;
};
 
template <typename E>
MoFEMErrorCode PostProcBrokenMeshInMoabBase<E>::transferTags() {
  MoFEMFunctionBegin;
 
  auto &calc_mesh = this->mField.get_moab();
 
  auto name = [&](auto tag) {
    std::string name;
    CHK_MOAB_THROW(calc_mesh.tag_get_name(tag, name), "get name");
    return name;
  };
 
  auto data_type = [&](auto tag) {
    moab::DataType data_type;
    CHK_MOAB_THROW(calc_mesh.tag_get_data_type(tag, data_type),
                   "get data type");
    return data_type;
  };
 
  auto type = [&](auto tag) {
    moab::TagType type;
    CHK_MOAB_THROW(calc_mesh.tag_get_type(tag, type), "get tag type");
    return type;
  };
 
  auto length = [&](auto tag) {
    int length;
    CHK_MOAB_THROW(calc_mesh.tag_get_length(tag, length), "get length ");
    return length;
  };
 
  auto default_value = [&](auto tag) {
    const void *def_val;
    int size;
    CHK_MOAB_THROW(calc_mesh.tag_get_default_value(tag, def_val, size),
                   "get default tag value");
    return def_val;
  };
 
  std::vector<double> tag_data_vec;
  auto data_ptr = [&](auto tag) {
    const void *tag_data;
    auto core_ent = this->getFEEntityHandle();
    CHK_MOAB_THROW(calc_mesh.tag_get_by_ptr(tag, &core_ent, 1, &tag_data),
                   "get tag data");
    if (data_type(tag) == MB_TYPE_DOUBLE) {
      tag_data_vec.resize(length(tag));
      std::copy(static_cast<const double *>(tag_data),
                static_cast<const double *>(tag_data) + length(tag),
                tag_data_vec.begin());
      for (auto &v : tag_data_vec)
        v = std::abs(v) < std::numeric_limits<float>::epsilon() ? 0. : v;
      return static_cast<const void *>(tag_data_vec.data());
    }
    return tag_data;
  };
 
  for (auto tag : tagsToTransfer) {
    Tag tag_postproc;
    CHKERR getPostProcMesh().tag_get_handle(
        name(tag).c_str(), length(tag), data_type(tag), tag_postproc,
        type(tag) | MB_TAG_CREAT, default_value(tag));
    CHKERR getPostProcMesh().tag_clear_data(tag_postproc, postProcElements,
                                            data_ptr(tag));
  }
 
  MoFEMFunctionReturn(0);
};
 
template <typename E>
PostProcBrokenMeshInMoabBase<E>::PostProcBrokenMeshInMoabBase(
    MoFEM::Interface &m_field, std::string opts_prefix)
    : E(m_field), optionsPrefix(opts_prefix) {}
 
template <typename E>
PostProcBrokenMeshInMoabBase<E>::PostProcBrokenMeshInMoabBase(
    MoFEM::Interface &m_field, boost::shared_ptr<moab::Core> core_mesh_ptr,
    std::string opts_prefix)
    : PostProcBrokenMeshInMoabBase(m_field, opts_prefix) {
  coreMeshPtr = core_mesh_ptr;
}
 
template <typename E>
PostProcBrokenMeshInMoabBase<E>::~PostProcBrokenMeshInMoabBase() {
  ParallelComm *pcomm_post_proc_mesh =
      ParallelComm::get_pcomm(&getPostProcMesh(), MYPCOMM_INDEX);
  if (pcomm_post_proc_mesh != NULL)
    delete pcomm_post_proc_mesh;
}
 
template <typename E> int PostProcBrokenMeshInMoabBase<E>::getRule(int order) {
  return -1;
};
 
template <typename E>
MoFEMErrorCode PostProcBrokenMeshInMoabBase<E>::setGaussPts(int order) {
  MoFEMFunctionBegin;
 
  auto type = type_from_handle(this->getFEEntityHandle());
 
  PostProcGenerateRefMeshPtr ref_ele;
 
  try {
    ref_ele = refElementsMap.at(type);
  } catch (const out_of_range &e) {
    SETERRQ1(
        PETSC_COMM_SELF, MOFEM_NOT_IMPLEMENTED,
        "Generation of reference elements for type <%s> is not implemented",
        moab::CN::EntityTypeName(type));
  }
 
  auto set_gauss_pts = [&](auto &level_gauss_pts_on_ref_mesh, auto &level_ref,
                           auto &level_shape_functions,
 
                           auto start_vert_handle, auto start_ele_handle,
                           auto &verts_array, auto &conn, auto &ver_count,
                           auto &ele_count
 
                       ) {
    MoFEMFunctionBegin;
 
    size_t level = getMaxLevel();
    level = std::min(level, level_gauss_pts_on_ref_mesh.size() - 1);
 
    auto &level_ref_gauss_pts = level_gauss_pts_on_ref_mesh[level];
    auto &level_ref_ele = level_ref[level];
    auto &shape_functions = level_shape_functions[level];
    E::gaussPts.resize(level_ref_gauss_pts.size1(), level_ref_gauss_pts.size2(),
                       false);
    noalias(E::gaussPts) = level_ref_gauss_pts;
 
    const auto fe_ent = E::numeredEntFiniteElementPtr->getEnt();
    auto get_fe_coords = [&]() {
      const EntityHandle *conn;
      int num_nodes;
      CHK_MOAB_THROW(
          E::mField.get_moab().get_connectivity(fe_ent, conn, num_nodes, true),
          "error get connectivity");
      VectorDouble coords(num_nodes * 3);
      CHK_MOAB_THROW(
          E::mField.get_moab().get_coords(conn, num_nodes, &*coords.begin()),
          "error get coordinates");
      return coords;
    };
 
    auto coords = get_fe_coords();
 
    const int num_nodes = level_ref_gauss_pts.size2();
    mapGaussPts.resize(level_ref_gauss_pts.size2());
 
    FTensor::Index<'i', 3> i;
    FTensor::Tensor0<FTensor::PackPtr<double *, 1>> t_n(
        &*shape_functions.data().begin());
    FTensor::Tensor1<FTensor::PackPtr<double *, 1>, 3> t_coords(
        &verts_array[0][ver_count], &verts_array[1][ver_count],
        &verts_array[2][ver_count]);
    for (int gg = 0; gg != num_nodes; ++gg, ++ver_count) {
 
      mapGaussPts[gg] = start_vert_handle + ver_count;
 
      auto set_float_precision = [](const double x) {
        if (std::abs(x) < std::numeric_limits<float>::epsilon())
          return 0.;
        else
          return x;
      };
 
      t_coords(i) = 0;
      auto t_ele_coords = getFTensor1FromArray<3, 3>(coords);
      for (int nn = 0; nn != CN::VerticesPerEntity(type); ++nn) {
        t_coords(i) += t_n * t_ele_coords(i);
        ++t_ele_coords;
        ++t_n;
      }
 
      for (auto ii : {0, 1, 2})
        t_coords(ii) = set_float_precision(t_coords(ii));
 
      ++t_coords;
    }
 
    Tag th;
    int def_in_the_loop = -1;
    CHKERR getPostProcMesh().tag_get_handle(
        "NB_IN_THE_LOOP", 1, MB_TYPE_INTEGER, th, MB_TAG_CREAT | MB_TAG_SPARSE,
        &def_in_the_loop);
 
    postProcElements.clear();
    const int num_el = level_ref_ele.size1();
    const int num_nodes_on_ele = level_ref_ele.size2();
    auto start_e = start_ele_handle + ele_count;
    postProcElements = Range(start_e, start_e + num_el - 1);
    for (auto tt = 0; tt != level_ref_ele.size1(); ++tt, ++ele_count) {
      for (int nn = 0; nn != num_nodes_on_ele; ++nn) {
        conn[num_nodes_on_ele * ele_count + nn] =
            mapGaussPts[level_ref_ele(tt, nn)];
      }
    }
 
    const int n_in_the_loop = E::nInTheLoop;
    CHKERR getPostProcMesh().tag_clear_data(th, postProcElements,
                                            &n_in_the_loop);
    CHKERR transferTags();
 
    MoFEMFunctionReturn(0);
  };
 
  CHKERR set_gauss_pts(
 
      ref_ele->levelGaussPtsOnRefMesh, ref_ele->levelRef,
      ref_ele->levelShapeFunctions,
 
      ref_ele->startingVertEleHandle, ref_ele->startingEleHandle,
      ref_ele->verticesOnEleArrays, ref_ele->eleConn, ref_ele->countVertEle,
      ref_ele->countEle
 
  );
 
  MoFEMFunctionReturn(0);
};
 
template <typename E>
MoFEMErrorCode PostProcBrokenMeshInMoabBase<E>::preProcPostProc() {
  MoFEMFunctionBegin;
 
auto get_ref_ele = [&](const EntityType type) {
  PostProcGenerateRefMeshPtr ref_ele_ptr;
  
  auto it = refElementsMap.find(type);
  if (it != refElementsMap.end()) {
    ref_ele_ptr = it->second;
  } else {
    switch (type) {
    case MBTET:
      ref_ele_ptr = boost::make_shared<PostProcGenerateRefMesh<MBTET>>();
      break;
    case MBHEX:
      ref_ele_ptr = boost::make_shared<PostProcGenerateRefMesh<MBHEX>>();
      break;
    case MBTRI:
      ref_ele_ptr = boost::make_shared<PostProcGenerateRefMesh<MBTRI>>();
      break;
    case MBQUAD:
      ref_ele_ptr = boost::make_shared<PostProcGenerateRefMesh<MBQUAD>>();
      break;
    case MBEDGE:
      ref_ele_ptr = boost::make_shared<PostProcGenerateRefMesh<MBEDGE>>();
      break;
    default:
      MOFEM_LOG("SELF", Sev::error)
          << "Generation of reference elements for type < "
          << moab::CN::EntityTypeName(type) << " > is not implemented";
      CHK_THROW_MESSAGE(MOFEM_NOT_IMPLEMENTED, "Element not implemented");
    }
 
    CHK_THROW_MESSAGE(ref_ele_ptr->getOptions(optionsPrefix), "getOptions");
    CHK_THROW_MESSAGE(ref_ele_ptr->generateReferenceElementMesh(),
                      "Error when generating reference element");
    
    refElementsMap[type] = ref_ele_ptr;
  }
 
  return ref_ele_ptr;
};
 
  auto fe_ptr = this->problemPtr->numeredFiniteElementsPtr;
 
  auto miit =
      fe_ptr->template get<Composite_Name_And_Part_mi_tag>().lower_bound(
          boost::make_tuple(this->getFEName(), this->getLoFERank()));
  auto hi_miit =
      fe_ptr->template get<Composite_Name_And_Part_mi_tag>().upper_bound(
          boost::make_tuple(this->getFEName(), this->getHiFERank()));
 
  const int number_of_ents_in_the_loop = this->getLoopSize();
  if (std::distance(miit, hi_miit) != number_of_ents_in_the_loop) {
    SETERRQ(E::mField.get_comm(), MOFEM_DATA_INCONSISTENCY,
            "Wrong size of indicies. Inconsistent size number of iterated "
            "elements iterated by problem and from range.");
  }
 
  for (auto &m : refElementsMap) {
    m.second->nbVertices = 0;
    m.second->nbEles = 0;
    m.second->countEle = 0;
    m.second->countVertEle = 0;
  }
 
  for (; miit != hi_miit; ++miit) {
    auto type = (*miit)->getEntType();
    auto ref_ele = get_ref_ele(type);
 
    // Set pointer to element. So that getDataVectorDofsPtr in getMaxLevel
    // can work
    E::numeredEntFiniteElementPtr = *miit;
    bool add = true;
    if (E::exeTestHook) {
      add = E::exeTestHook(this);
    }
 
    if (add) {
      size_t level = getMaxLevel();
      level = std::min(level, ref_ele->levelGaussPtsOnRefMesh.size() - 1);
      ref_ele->nbVertices += ref_ele->levelGaussPtsOnRefMesh[level].size2();
      ref_ele->nbEles += ref_ele->levelRef[level].size1();
    }
  }
 
  auto alloc_vertices_and_elements_on_post_proc_mesh = [&]() {
    MoFEMFunctionBegin;
 
    ReadUtilIface *iface;
    CHKERR getPostProcMesh().query_interface(iface);
 
    for (auto &m : refElementsMap) {
      if (m.second->nbEles) {
        CHKERR iface->get_node_coords(3, m.second->nbVertices, 0,
                                      m.second->startingVertEleHandle,
                                      m.second->verticesOnEleArrays);
        CHKERR iface->get_element_connect(
            m.second->nbEles, m.second->levelRef[0].size2(), m.first, 0,
            m.second->startingEleHandle, m.second->eleConn);
 
        m.second->countEle = 0;
        m.second->countVertEle = 0;
      }
    }
 
    MoFEMFunctionReturn(0);
  };
 
  CHKERR alloc_vertices_and_elements_on_post_proc_mesh();
 
  MoFEMFunctionReturn(0);
}
 
template <typename E>
MoFEMErrorCode PostProcBrokenMeshInMoabBase<E>::postProcPostProc() {
  MoFEMFunctionBegin;
 
  auto update_elements = [&]() {
    ReadUtilIface *iface;
    CHKERR getPostProcMesh().query_interface(iface);
    MoFEMFunctionBegin;
 
    Range ents;
    for (auto &m : refElementsMap) {
      if (m.second->nbEles) {
        MOFEM_TAG_AND_LOG("SELF", Sev::noisy, "PostProc")
            << "Update < " << moab::CN::EntityTypeName(m.first)
            << " number of processed " << m.second->countEle;
        CHKERR iface->update_adjacencies(
            m.second->startingEleHandle, m.second->countEle,
            m.second->levelRef[0].size2(), m.second->eleConn);
        ents.merge(Range(m.second->startingEleHandle,
                         m.second->startingEleHandle + m.second->countEle - 1));
      }
    }
 
    MoFEMFunctionReturn(0);
  };
 
  auto remove_obsolete_entities = [&]() {
    MoFEMFunctionBegin;
    Range ents, adj;
    for (auto &m : refElementsMap) {
      if (m.second->nbEles) {
        ents.merge(Range(m.second->startingEleHandle,
                         m.second->startingEleHandle + m.second->countEle - 1));
        const int dim = moab::CN::Dimension(m.first);
        for (auto d = 1; d != dim; ++d) {
          CHKERR getPostProcMesh().get_adjacencies(ents, d, false, adj,
                                                   moab::Interface::UNION);
        }
      }
    }
    CHKERR getPostProcMesh().delete_entities(adj);
    MoFEMFunctionReturn(0);
  };
 
  auto set_proc_tags = [&]() {
    MoFEMFunctionBegin;
    ParallelComm *pcomm_post_proc_mesh =
        ParallelComm::get_pcomm(&(getPostProcMesh()), MYPCOMM_INDEX);
    if (pcomm_post_proc_mesh) {
      Range ents;
      for (auto &m : refElementsMap) {
        if (m.second->nbEles) {
          ents.merge(
              Range(m.second->startingEleHandle,
                    m.second->startingEleHandle + m.second->countEle - 1));
        }
      }
 
      int rank = E::mField.get_comm_rank();
      CHKERR getPostProcMesh().tag_clear_data(pcomm_post_proc_mesh->part_tag(),
                                              ents, &rank);
    }
    MoFEMFunctionReturn(0);
  };
 
  CHKERR update_elements();
  CHKERR remove_obsolete_entities();
  CHKERR set_proc_tags();
 
  MoFEMFunctionReturn(0);
}
 
template <typename E>
MoFEMErrorCode PostProcBrokenMeshInMoabBase<E>::preProcess() {
  MoFEMFunctionBegin;
 
  ParallelComm *pcomm_post_proc_mesh =
      ParallelComm::get_pcomm(&getPostProcMesh(), MYPCOMM_INDEX);
  if (pcomm_post_proc_mesh != NULL)
    delete pcomm_post_proc_mesh;
  CHKERR getPostProcMesh().delete_mesh();
  pcomm_post_proc_mesh =
      new ParallelComm(&(getPostProcMesh()), PETSC_COMM_WORLD);
 
  CHKERR preProcPostProc();
 
  MoFEMFunctionReturn(0);
}
 
template <typename E>
MoFEMErrorCode PostProcBrokenMeshInMoabBase<E>::postProcess() {
  MoFEMFunctionBeginHot;
 
  ParallelComm *pcomm_post_proc_mesh =
      ParallelComm::get_pcomm(&getPostProcMesh(), MYPCOMM_INDEX);
  if(pcomm_post_proc_mesh == nullptr)
    SETERRQ(PETSC_COMM_WORLD, MOFEM_DATA_INCONSISTENCY, "PComm not allocated");
 
  CHKERR postProcPostProc();
  CHKERR pcomm_post_proc_mesh->resolve_shared_ents(0);
 
  MoFEMFunctionReturnHot(0);
}
 
template <typename E> auto &PostProcBrokenMeshInMoabBase<E>::getMapGaussPts() {
  return mapGaussPts;
}
 
template <typename E> auto &PostProcBrokenMeshInMoabBase<E>::getPostProcMesh() {
  if (!coreMeshPtr)
    CHK_THROW_MESSAGE(MOFEM_DATA_INCONSISTENCY, "Core mesh not set");
  moab::Interface &post_proc_mesh_interface = *coreMeshPtr;
  return post_proc_mesh_interface;
}
 
template <typename E>
inline auto &PostProcBrokenMeshInMoabBase<E>::getPostProcElements() {
  return postProcElements;
}
 
template <typename E>
MoFEMErrorCode
PostProcBrokenMeshInMoabBase<E>::writeFile(const std::string file_name) {
  MoFEMFunctionBegin;
  ParallelComm *pcomm_post_proc_mesh =
      ParallelComm::get_pcomm(&getPostProcMesh(), MYPCOMM_INDEX);
  if (pcomm_post_proc_mesh == NULL)
    SETERRQ(PETSC_COMM_SELF, MOFEM_DATA_INCONSISTENCY,
            "ParallelComm not allocated");
  CHKERR getPostProcMesh().write_file(file_name.c_str(), "MOAB",
                                      "PARALLEL=WRITE_PART");
  MoFEMFunctionReturn(0);
};
 
template <typename E> struct PostProcBrokenMeshInMoab;
 
template <>
struct PostProcBrokenMeshInMoab<VolumeElementForcesAndSourcesCore>
    : public PostProcBrokenMeshInMoabBase<VolumeElementForcesAndSourcesCore> {
  using PostProcBrokenMeshInMoabBase<
      VolumeElementForcesAndSourcesCore>::PostProcBrokenMeshInMoabBase;
};
 
template <>
struct PostProcBrokenMeshInMoab<FaceElementForcesAndSourcesCore>
    : public PostProcBrokenMeshInMoabBase<FaceElementForcesAndSourcesCore> {
  using PostProcBrokenMeshInMoabBase<
      FaceElementForcesAndSourcesCore>::PostProcBrokenMeshInMoabBase;
};
 
template <>
struct PostProcBrokenMeshInMoab<EdgeElementForcesAndSourcesCore>
    : public PostProcBrokenMeshInMoabBase<EdgeElementForcesAndSourcesCore> {
  using PostProcBrokenMeshInMoabBase<
      EdgeElementForcesAndSourcesCore>::PostProcBrokenMeshInMoabBase;
};
 
/**
 * @brief Post post-proc data at points from hash maps
 *
 * @tparam DIM1 dimension of vector in data_map_vec  and first column of
 * data_map_may
 * @tparam DIM2 dimension of second column in data_map_mat
 */
template <int DIM1, int DIM2,
          typename O = ForcesAndSourcesCore::UserDataOperator>
struct OpPostProcMapInMoab : public O {
 
  using DataMapVec = std::map<std::string, boost::shared_ptr<VectorDouble>>;
  using DataMapMat = std::map<std::string, boost::shared_ptr<MatrixDouble>>;
 
  /**
   * @brief Construct a new OpPostProcMapInMoab object
   *
   * @param post_proc_mesh postprocessing mesh
   * @param map_gauss_pts map of gauss points to nodes of postprocessing mesh
   * @param data_map_scalar hash map of scalar values (string is name of the
   * tag)
   * @param data_map_vec hash map of vector values
   * @param data_map_mat hash map of second order tensor values
   * @param data_symm_map_mat hash map of symmetric second order tensor values
   */
  OpPostProcMapInMoab(moab::Interface &post_proc_mesh,
                      std::vector<EntityHandle> &map_gauss_pts,
                      DataMapVec data_map_scalar, DataMapMat data_map_vec,
                      DataMapMat data_map_mat, DataMapMat data_symm_map_mat)
      : O(NOSPACE, O::OPSPACE), postProcMesh(post_proc_mesh),
        mapGaussPts(map_gauss_pts), dataMapScalar(data_map_scalar),
        dataMapVec(data_map_vec), dataMapMat(data_map_mat),
        dataMapSymmMat(data_symm_map_mat) {
    // Operator is only executed for vertices
    std::fill(&O::doEntities[MBEDGE], &O::doEntities[MBMAXTYPE], false);
  }
  MoFEMErrorCode doWork(int side, EntityType type,
                        EntitiesFieldData::EntData &data);
 
private:
  moab::Interface &postProcMesh;
  std::vector<EntityHandle> &mapGaussPts;
  DataMapVec dataMapScalar;
  DataMapMat dataMapVec;
  DataMapMat dataMapMat;
  DataMapMat dataMapSymmMat;
};
 
template <int DIM1, int DIM2, typename O>
MoFEMErrorCode
OpPostProcMapInMoab<DIM1, DIM2, O>::doWork(int side, EntityType type,
                                           EntitiesFieldData::EntData &data) {
  MoFEMFunctionBegin;
 
  std::array<double, 9> def;
  std::fill(def.begin(), def.end(), 0);
 
  auto get_tag = [&](const std::string name, size_t size) {
    Tag th;
    CHKERR postProcMesh.tag_get_handle(name.c_str(), size, MB_TYPE_DOUBLE, th,
                                       MB_TAG_CREAT | MB_TAG_SPARSE,
                                       def.data());
    return th;
  };
 
  MatrixDouble3by3 mat(3, 3);
 
  auto set_vector_3d = [&](auto &t) -> MatrixDouble3by3 & {
    mat.clear();
    for (size_t r = 0; r != DIM1; ++r)
      mat(0, r) = t(r);
    return mat;
  };
 
  auto set_matrix_3d = [&](auto &t) -> MatrixDouble3by3 & {
    mat.clear();
    for (size_t r = 0; r != DIM1; ++r)
      for (size_t c = 0; c != DIM2; ++c)
        mat(r, c) = t(r, c);
    return mat;
  };
 
  auto set_matrix_symm_3d = [&](auto &t) -> MatrixDouble3by3 & {
    mat.clear();
    for (size_t r = 0; r != DIM1; ++r)
      for (size_t c = 0; c != DIM1; ++c)
        mat(r, c) = t(r, c);
    return mat;
  };
 
  auto set_scalar = [&](auto t) -> MatrixDouble3by3 & {
    mat.clear();
    mat(0, 0) = t;
    return mat;
  };
 
  auto set_float_precision = [](const double x) {
    if (std::abs(x) < std::numeric_limits<float>::epsilon())
      return 0.;
    else
      return x;
  };
 
  auto set_tag = [&](auto th, auto gg, MatrixDouble3by3 &mat) {
    for (auto &v : mat.data())
      v = set_float_precision(v);
    return postProcMesh.tag_set_data(th, &mapGaussPts[gg], 1,
                                     &*mat.data().begin());
  };
 
  for (auto &m : dataMapScalar) {
    if (m.second) {
      auto th = get_tag(m.first, 1);
      auto t_scl = getFTensor0FromVec(*m.second);
      auto nb_integration_pts = O::getGaussPts().size2();
      for (int gg = 0; gg != nb_integration_pts; ++gg) {
        CHKERR set_tag(th, gg, set_scalar(t_scl));
        ++t_scl;
      }
    }
  }
 
  for (auto &m : dataMapVec) {
    if (m.second) {
      auto th = get_tag(m.first, 3);
      auto t_vec = getFTensor1FromMat<DIM1>(*m.second);
      auto nb_integration_pts = O::getGaussPts().size2();
      for (int gg = 0; gg != nb_integration_pts; ++gg) {
        CHKERR set_tag(th, gg, set_vector_3d(t_vec));
        ++t_vec;
      }
    }
  }
 
  for (auto &m : dataMapMat) {
    if (m.second) {
      auto th = get_tag(m.first, 9);
      auto t_mat = getFTensor2FromMat<DIM1, DIM2>(*m.second);
      auto nb_integration_pts = O::getGaussPts().size2();
      for (int gg = 0; gg != nb_integration_pts; ++gg) {
        CHKERR set_tag(th, gg, set_matrix_3d(t_mat));
        ++t_mat;
      }
    }
  }
 
  for (auto &m : dataMapSymmMat) {
    if (m.second) {
      auto th = get_tag(m.first, 9);
      auto t_mat = getFTensor2SymmetricFromMat<DIM1>(*m.second);
      auto nb_integration_pts = O::getGaussPts().size2();
      for (int gg = 0; gg != nb_integration_pts; ++gg) {
        CHKERR set_tag(th, gg, set_matrix_symm_3d(t_mat));
        ++t_mat;
      }
    }
  }
 
  MoFEMFunctionReturn(0);
}
 
template <typename PostProcEle> struct PostProcBrokenMeshInMoabBaseBeginImpl;
 
template <typename E>
struct PostProcBrokenMeshInMoabBaseBeginImpl
    : protected PostProcBrokenMeshInMoabBase<E> {
 
  PostProcBrokenMeshInMoabBaseBeginImpl(
      MoFEM::Interface &m_field, boost::shared_ptr<moab::Core> core_mesh_ptr,
      std::string opts_prefix = "")
      : PostProcBrokenMeshInMoabBase<E>(m_field, core_mesh_ptr, opts_prefix) {}
 
  MoFEMErrorCode preProcess() {
    MoFEMFunctionBegin;
    ParallelComm *pcomm_post_proc_mesh =
        ParallelComm::get_pcomm(&this->getPostProcMesh(), MYPCOMM_INDEX);
    if (pcomm_post_proc_mesh != NULL)
      delete pcomm_post_proc_mesh;
    CHKERR this->getPostProcMesh().delete_mesh();
    pcomm_post_proc_mesh =
        new ParallelComm(&(this->getPostProcMesh()), PETSC_COMM_WORLD);
    MoFEMFunctionReturn(0);
  }
 
  inline FEMethod *getFEMethod() { return this; }
 
  MoFEMErrorCode operator()() { return 0; }
  MoFEMErrorCode postProcess() { return 0; }
};
 
template <typename PostProcEle> struct PostProcBrokenMeshInMoabBaseContImpl;
 
template <typename E>
struct PostProcBrokenMeshInMoabBaseContImpl
    : public PostProcBrokenMeshInMoabBase<E> {
 
  PostProcBrokenMeshInMoabBaseContImpl(
      MoFEM::Interface &m_field, boost::shared_ptr<moab::Core> core_mesh_ptr,
      std::string opts_prefix = "")
      : PostProcBrokenMeshInMoabBase<E>(m_field, core_mesh_ptr, opts_prefix) {}
 
  MoFEMErrorCode preProcess() { return this->preProcPostProc(); };
  MoFEMErrorCode postProcess() { return this->postProcPostProc(); };
 
protected:
  using PostProcBrokenMeshInMoabBase<E>::writeFile;
};
 
template <typename PostProcEle> struct PostProcBrokenMeshInMoabBaseEndImpl;
 
template <typename E>
struct PostProcBrokenMeshInMoabBaseEndImpl
    : protected PostProcBrokenMeshInMoabBase<E> {
 
  PostProcBrokenMeshInMoabBaseEndImpl(
      MoFEM::Interface &m_field, boost::shared_ptr<moab::Core> core_mesh_ptr,
      std::string opts_prefix = "")
      : PostProcBrokenMeshInMoabBase<E>(m_field, core_mesh_ptr, opts_prefix) {}
 
  MoFEMErrorCode preProcess() { return 0; }
  MoFEMErrorCode operator()() { return 0; }
  MoFEMErrorCode postProcess() {
    MoFEMFunctionBegin;
    ParallelComm *pcomm_post_proc_mesh =
        ParallelComm::get_pcomm(&this->getPostProcMesh(), MYPCOMM_INDEX);
    if (pcomm_post_proc_mesh == nullptr)
      SETERRQ(PETSC_COMM_WORLD, MOFEM_DATA_INCONSISTENCY,
              "PComm not allocated");
    CHKERR pcomm_post_proc_mesh->resolve_shared_ents(0);
    MoFEMFunctionReturn(0);
  }
 
  inline FEMethod *getFEMethod() { return this; }
 
  using PostProcBrokenMeshInMoabBase<E>::writeFile;
};
 
/**
 * @brief Enable to run stack of post-processing elements. Use this to begin stack. 
 * 
 * See @ref scalar_check_approximation.cpp
 * 
 */
using PostProcBrokenMeshInMoabBaseBegin = PostProcBrokenMeshInMoabBaseBeginImpl<
    PostProcBrokenMeshInMoabBase<ForcesAndSourcesCore>>;
 
/**
 * @brief Enable to run stack of post-processing elements. 
 * 
 * See @ref scalar_check_approximation.cpp
 * 
 * @tparam E 
 */
template <typename E>
using PostProcBrokenMeshInMoabBaseCont =
    PostProcBrokenMeshInMoabBaseContImpl<PostProcBrokenMeshInMoabBase<E>>;
 
/**
 * @brief Enable to run stack of post-processing elements. Use this to end stack.
 * 
 */
using PostProcBrokenMeshInMoabBaseEnd = PostProcBrokenMeshInMoabBaseEndImpl<
    PostProcBrokenMeshInMoabBase<ForcesAndSourcesCore>>;
 
 
} // namespace MoFEM
 
#endif //__POSTPROCBROKENMESHINMOABBASE_HPP