C++ Mesh::getNumberOfElements方法代码示例

std::unique_ptr<PythonBoundaryCondition> createPythonBoundaryCondition(
    BaseLib::ConfigTree const& config, MeshLib::Mesh const& boundary_mesh,
    NumLib::LocalToGlobalIndexMap const& dof_table, std::size_t bulk_mesh_id,
    int const variable_id, int const component_id,
    unsigned const integration_order, unsigned const shapefunction_order,
    unsigned const global_dim)
{
    //! \ogs_file_param{prj__process_variables__process_variable__boundary_conditions__boundary_condition__type}
    config.checkConfigParameter("type", "Python");

    //! \ogs_file_param{prj__process_variables__process_variable__boundary_conditions__boundary_condition__Python__bc_object}
    auto const bc_object = config.getConfigParameter<std::string>("bc_object");
    //! \ogs_file_param{prj__process_variables__process_variable__boundary_conditions__boundary_condition__Python__flush_stdout}
    auto const flush_stdout = config.getConfigParameter("flush_stdout", false);

    // Evaluate Python code in scope of main module
    pybind11::object scope =
        pybind11::module::import("__main__").attr("__dict__");

    if (!scope.contains(bc_object))
        OGS_FATAL(
            "Function `%s' is not defined in the python script file, or there "
            "was no python script file specified.",
            bc_object.c_str());

    auto* bc = scope[bc_object.c_str()]
                   .cast<PythonBoundaryConditionPythonSideInterface*>();

    if (variable_id >= static_cast<int>(dof_table.getNumberOfVariables()) ||
        component_id >= dof_table.getNumberOfVariableComponents(variable_id))
    {
        OGS_FATAL(
            "Variable id or component id too high. Actual values: (%d, %d), "
            "maximum values: (%d, %d).",
            variable_id, component_id, dof_table.getNumberOfVariables(),
            dof_table.getNumberOfVariableComponents(variable_id));
    }

    // In case of partitioned mesh the boundary could be empty, i.e. there is no
    // boundary condition.
#ifdef USE_PETSC
    // This can be extracted to createBoundaryCondition() but then the config
    // parameters are not read and will cause an error.
    // TODO (naumov): Add a function to ConfigTree for skipping the tags of the
    // subtree and move the code up in createBoundaryCondition().
    if (boundary_mesh.getDimension() == 0 &&
        boundary_mesh.getNumberOfNodes() == 0 &&
        boundary_mesh.getNumberOfElements() == 0)
    {
        return nullptr;
    }
#endif  // USE_PETSC

    return std::make_unique<PythonBoundaryCondition>(
        PythonBoundaryConditionData{
            bc, dof_table, bulk_mesh_id,
            dof_table.getGlobalComponent(variable_id, component_id),
            boundary_mesh},
        integration_order, shapefunction_order, global_dim, flush_stdout);
}

bool convertMeshToGeo(const MeshLib::Mesh &mesh, GeoLib::GEOObjects &geo_objects, double eps)
{
    if (mesh.getDimension() != 2)
    {
        ERR ("Mesh to geometry conversion is only working for 2D meshes.");
        return false;
    }

    // nodes to points conversion
    std::string mesh_name(mesh.getName());
    {
        auto points = std::make_unique<std::vector<GeoLib::Point*>>();
        points->reserve(mesh.getNumberOfNodes());

        for (auto node_ptr : mesh.getNodes())
            points->push_back(new GeoLib::Point(*node_ptr, node_ptr->getID()));

        geo_objects.addPointVec(std::move(points), mesh_name, nullptr, eps);
    }
    const std::vector<std::size_t> id_map (geo_objects.getPointVecObj(mesh_name)->getIDMap());

    // elements to surface triangles conversion
    std::string const mat_name ("MaterialIDs");
    auto bounds (MeshInformation::getValueBounds<int>(mesh, mat_name));
    const unsigned nMatGroups(bounds.second-bounds.first+1);
    auto sfcs = std::make_unique<std::vector<GeoLib::Surface*>>();
    sfcs->reserve(nMatGroups);
    auto const& points = *geo_objects.getPointVec(mesh_name);
    for (unsigned i=0; i<nMatGroups; ++i)
        sfcs->push_back(new GeoLib::Surface(points));

    const std::vector<MeshLib::Element*> &elements = mesh.getElements();
    const std::size_t nElems (mesh.getNumberOfElements());

    MeshLib::PropertyVector<int> const*const materialIds =
        mesh.getProperties().existsPropertyVector<int>("MaterialIDs")
            ? mesh.getProperties().getPropertyVector<int>("MaterialIDs")
            : nullptr;

    for (unsigned i=0; i<nElems; ++i)
    {
        auto surfaceId = !materialIds ? 0 : ((*materialIds)[i] - bounds.first);
        MeshLib::Element* e (elements[i]);
        if (e->getGeomType() == MeshElemType::TRIANGLE)
            (*sfcs)[surfaceId]->addTriangle(id_map[e->getNodeIndex(0)], id_map[e->getNodeIndex(1)], id_map[e->getNodeIndex(2)]);
        if (e->getGeomType() == MeshElemType::QUAD)
        {
            (*sfcs)[surfaceId]->addTriangle(id_map[e->getNodeIndex(0)], id_map[e->getNodeIndex(1)], id_map[e->getNodeIndex(2)]);
            (*sfcs)[surfaceId]->addTriangle(id_map[e->getNodeIndex(0)], id_map[e->getNodeIndex(2)], id_map[e->getNodeIndex(3)]);
        }
        // all other element types are ignored (i.e. lines)
    }

    std::for_each(sfcs->begin(), sfcs->end(), [](GeoLib::Surface* sfc){ if (sfc->getNumberOfTriangles()==0) delete sfc; sfc = nullptr;});
    auto sfcs_end = std::remove(sfcs->begin(), sfcs->end(), nullptr);
    sfcs->erase(sfcs_end, sfcs->end());

    geo_objects.addSurfaceVec(std::move(sfcs), mesh_name);
    return true;
}

std::unique_ptr<DirichletBoundaryCondition> createDirichletBoundaryCondition(
    BaseLib::ConfigTree const& config, MeshLib::Mesh const& bc_mesh,
    NumLib::LocalToGlobalIndexMap const& dof_table_bulk, int const variable_id,
    int const component_id,
    const std::vector<std::unique_ptr<ProcessLib::ParameterBase>>& parameters)
{
    DBUG("Constructing DirichletBoundaryCondition from config.");
    //! \ogs_file_param{prj__process_variables__process_variable__boundary_conditions__boundary_condition__type}
    config.checkConfigParameter("type", "Dirichlet");

    //! \ogs_file_param{prj__process_variables__process_variable__boundary_conditions__boundary_condition__Dirichlet__parameter}
    auto const param_name = config.getConfigParameter<std::string>("parameter");
    DBUG("Using parameter %s", param_name.c_str());

    auto& param = findParameter<double>(param_name, parameters, 1);

    // In case of partitioned mesh the boundary could be empty, i.e. there is no
    // boundary condition.
#ifdef USE_PETSC
    // This can be extracted to createBoundaryCondition() but then the config
    // parameters are not read and will cause an error.
    // TODO (naumov): Add a function to ConfigTree for skipping the tags of the
    // subtree and move the code up in createBoundaryCondition().
    if (bc_mesh.getDimension() == 0 && bc_mesh.getNumberOfNodes() == 0 &&
        bc_mesh.getNumberOfElements() == 0)
    {
        return nullptr;
    }
#endif  // USE_PETSC

    return std::make_unique<DirichletBoundaryCondition>(
        param, bc_mesh, dof_table_bulk, variable_id, component_id);
}

std::unique_ptr<RobinBoundaryCondition> createRobinBoundaryCondition(
    BaseLib::ConfigTree const& config, MeshLib::Mesh const& bc_mesh,
    NumLib::LocalToGlobalIndexMap const& dof_table, int const variable_id,
    int const component_id, unsigned const integration_order,
    unsigned const shapefunction_order, unsigned const global_dim,
    std::vector<std::unique_ptr<ParameterLib::ParameterBase>> const& parameters)
{
    DBUG("Constructing RobinBcConfig from config.");
    //! \ogs_file_param{prj__process_variables__process_variable__boundary_conditions__boundary_condition__type}
    config.checkConfigParameter("type", "Robin");

    //! \ogs_file_param{prj__process_variables__process_variable__boundary_conditions__boundary_condition__Robin__alpha}
    auto const alpha_name = config.getConfigParameter<std::string>("alpha");
    //! \ogs_file_param{prj__process_variables__process_variable__boundary_conditions__boundary_condition__Robin__u_0}
    auto const u_0_name = config.getConfigParameter<std::string>("u_0");

    auto const& alpha =
        ParameterLib::findParameter<double>(alpha_name, parameters, 1);
    auto const& u_0 =
        ParameterLib::findParameter<double>(u_0_name, parameters, 1);

    // In case of partitioned mesh the boundary could be empty, i.e. there is no
    // boundary condition.
#ifdef USE_PETSC
    // This can be extracted to createBoundaryCondition() but then the config
    // parameters are not read and will cause an error.
    // TODO (naumov): Add a function to ConfigTree for skipping the tags of the
    // subtree and move the code up in createBoundaryCondition().
    if (bc_mesh.getDimension() == 0 && bc_mesh.getNumberOfNodes() == 0 &&
        bc_mesh.getNumberOfElements() == 0)
    {
        return nullptr;
    }
#endif  // USE_PETSC

    return std::make_unique<RobinBoundaryCondition>(
        integration_order, shapefunction_order, dof_table, variable_id,
        component_id, global_dim, bc_mesh,
        RobinBoundaryConditionData{alpha, u_0});
}

/// Adds the integration point data and creates meta data for it.
///
/// Returns meta data for the written integration point data.
static ProcessLib::IntegrationPointMetaData addIntegrationPointData(
    MeshLib::Mesh& mesh, ProcessLib::IntegrationPointWriter const& writer)
{
    auto const& ip_values = writer.values(/*t, x, dof_table*/);
    assert(ip_values.size() == mesh.getNumberOfElements());

    // create field data and fill it with nodal values, and an offsets cell
    // array indicating where the cell's integration point data starts.
    auto& field_data = *MeshLib::getOrCreateMeshProperty<double>(
        mesh, writer.name(), MeshLib::MeshItemType::IntegrationPoint,
        writer.numberOfComponents());
    field_data.clear();

    for (const auto& element_ip_values : ip_values)
    {
        std::copy(element_ip_values.begin(), element_ip_values.end(),
                  std::back_inserter(field_data));
    }

    return {writer.name(), writer.numberOfComponents(),
            writer.integrationOrder()};
}

int main (int argc, char* argv[])
{
    ApplicationsLib::LogogSetup logog_setup;

    TCLAP::CmdLine cmd("Converts VTK mesh into OGS mesh.", ' ', "0.1");
    TCLAP::ValueArg<std::string> mesh_in("i", "mesh-input-file",
                                         "the name of the file containing the input mesh", true,
                                         "", "file name of input mesh");
    cmd.add(mesh_in);
    TCLAP::ValueArg<std::string> mesh_out("o", "mesh-output-file",
                                          "the name of the file the mesh will be written to", true,
                                          "", "file name of output mesh");
    cmd.add(mesh_out);
    cmd.parse(argc, argv);

    MeshLib::Mesh* mesh (MeshLib::IO::VtuInterface::readVTUFile(mesh_in.getValue()));
    INFO("Mesh read: %d nodes, %d elements.", mesh->getNumberOfNodes(), mesh->getNumberOfElements());

    MeshLib::IO::Legacy::MeshIO meshIO;
    meshIO.setMesh(mesh);
    meshIO.writeToFile(mesh_out.getValue());

    return EXIT_SUCCESS;
}

std::unique_ptr<MeshLib::Mesh> appendLinesAlongPolylines(
    const MeshLib::Mesh& mesh, const GeoLib::PolylineVec& ply_vec)
{
    // copy existing nodes and elements
    std::vector<MeshLib::Node*> vec_new_nodes = MeshLib::copyNodeVector(mesh.getNodes());
    std::vector<MeshLib::Element*> vec_new_eles = MeshLib::copyElementVector(mesh.getElements(), vec_new_nodes);

    auto const material_ids = materialIDs(mesh);
    int const max_matID =
        material_ids
            ? *(std::max_element(begin(*material_ids), end(*material_ids)))
            : 0;

    std::vector<int> new_mat_ids;
    const std::size_t n_ply (ply_vec.size());
    // for each polyline
    for (std::size_t k(0); k < n_ply; k++)
    {
        const GeoLib::Polyline* ply = (*ply_vec.getVector())[k];

        // search nodes on the polyline
        MeshGeoToolsLib::MeshNodesAlongPolyline mshNodesAlongPoly(
            mesh, *ply, mesh.getMinEdgeLength() * 0.5,
            MeshGeoToolsLib::SearchAllNodes::Yes);
        auto &vec_nodes_on_ply = mshNodesAlongPoly.getNodeIDs();
        if (vec_nodes_on_ply.empty()) {
            std::string ply_name;
            ply_vec.getNameOfElementByID(k, ply_name);
            INFO("No nodes found on polyline %s", ply_name.c_str());
            continue;
        }

        // add line elements
        for (std::size_t i=0; i<vec_nodes_on_ply.size()-1; i++) {
            std::array<MeshLib::Node*, 2> element_nodes;
            element_nodes[0] = vec_new_nodes[vec_nodes_on_ply[i]];
            element_nodes[1] = vec_new_nodes[vec_nodes_on_ply[i+1]];
            vec_new_eles.push_back(
                new MeshLib::Line(element_nodes, vec_new_eles.size()));
            new_mat_ids.push_back(max_matID+k+1);
        }
    }

    // generate a mesh
    const std::string name = mesh.getName() + "_with_lines";
    auto new_mesh =
        std::make_unique<MeshLib::Mesh>(name, vec_new_nodes, vec_new_eles);
    auto new_material_ids =
        new_mesh->getProperties().createNewPropertyVector<int>(
            "MaterialIDs", MeshLib::MeshItemType::Cell);
    if (!new_material_ids)
    {
        OGS_FATAL("Could not create MaterialIDs cell vector in new mesh.");
    }
    new_material_ids->reserve(new_mesh->getNumberOfElements());
    if (material_ids != nullptr)
    {
        std::copy(begin(*material_ids), end(*material_ids),
                  std::back_inserter(*new_material_ids));
    }
    else
    {
        new_material_ids->resize(mesh.getNumberOfElements());
    }
    std::copy(begin(new_mat_ids), end(new_mat_ids),
              std::back_inserter(*new_material_ids));
    return new_mesh;
}

void ElementTreeModel::setMesh(MeshLib::Mesh const& mesh)
{
    this->clearView();

    QList<QVariant> mesh_name;
    mesh_name << "Name:" << QString::fromStdString(mesh.getName()) << "" << "" << "";
    TreeItem* name_item = new TreeItem(mesh_name, _rootItem);
    _rootItem->appendChild(name_item);

    QList<QVariant> nodes_number;
    nodes_number << "#Nodes: " << QString::number(mesh.getNumberOfNodes()) << "" << "";
    TreeItem* nodes_item = new TreeItem(nodes_number, _rootItem);
    _rootItem->appendChild(nodes_item);

    QList<QVariant> elements_number;
    elements_number << "#Elements: " << QString::number(mesh.getNumberOfElements()) << "" << "";
    TreeItem* elements_item = new TreeItem(elements_number, _rootItem);
    _rootItem->appendChild(elements_item);

    const std::array<QString, 7> n_element_names = {{ "Lines:", "Triangles:", "Quads:", "Tetrahedra:", "Hexahedra:", "Pyramids:", "Prisms:" }};
    const std::array<unsigned, 7>& n_element_types (MeshLib::MeshInformation::getNumberOfElementTypes(mesh));
    for (std::size_t i=0; i<n_element_types.size(); ++i)
    {
        if (n_element_types[i])
        {
            QList<QVariant> elements_number;
            elements_number << n_element_names[i] << QString::number(n_element_types[i]) << "" << "";
            TreeItem* type_item = new TreeItem(elements_number, elements_item);
            elements_item->appendChild(type_item);
        }
    }

    QList<QVariant> bounding_box;
    bounding_box << "Bounding Box" << "" << "" << "";
    TreeItem* aabb_item = new TreeItem(bounding_box, _rootItem);
    _rootItem->appendChild(aabb_item);

    const GeoLib::AABB aabb (MeshLib::MeshInformation::getBoundingBox(mesh));
    auto const& min = aabb.getMinPoint();
    auto const& max = aabb.getMaxPoint();

    QList<QVariant> min_aabb;
    min_aabb << "Min:" << QString::number(min[0], 'f') << QString::number(min[1], 'f') << QString::number(min[2], 'f');
    TreeItem* min_item = new TreeItem(min_aabb, aabb_item);
    aabb_item->appendChild(min_item);

    QList<QVariant> max_aabb;
    max_aabb << "Max:" << QString::number(max[0], 'f') << QString::number(max[1], 'f') << QString::number(max[2], 'f');
    TreeItem* max_item = new TreeItem(max_aabb, aabb_item);
    aabb_item->appendChild(max_item);

    QList<QVariant> edges;
    edges << "Edge Length: " << "[" + QString::number(mesh.getMinEdgeLength(), 'f') + "," << QString::number(mesh.getMaxEdgeLength(), 'f') + "]" << "";
    TreeItem* edge_item = new TreeItem(edges, _rootItem);
    _rootItem->appendChild(edge_item);

    std::vector<std::string> const& vec_names (mesh.getProperties().getPropertyVectorNames());
    for (std::size_t i=0; i<vec_names.size(); ++i)
    {
        QList<QVariant> array_info;
        array_info << QString::fromStdString(vec_names[i]) + ": ";
        auto vec_bounds (MeshLib::MeshInformation::getValueBounds<int>(mesh, vec_names[i]));
        if (vec_bounds.second != std::numeric_limits<int>::max())
            array_info << "[" + QString::number(vec_bounds.first) + "," << QString::number(vec_bounds.second) + "]" << "";
        else
        {
            auto vec_bounds (MeshLib::MeshInformation::getValueBounds<double>(mesh, vec_names[i]));
            if (vec_bounds.second != std::numeric_limits<double>::max())
                array_info  << "[" + QString::number(vec_bounds.first) + "," << QString::number(vec_bounds.second) + "]" << "";
        }
        if (array_info.size() == 1)
            array_info << "[ ?" << "? ]" << "";
        TreeItem* vec_item = new TreeItem(array_info, _rootItem);
        _rootItem->appendChild(vec_item);
    }

    reset();

}

void MeshLayerMapper::addLayerToMesh(const MeshLib::Mesh &dem_mesh, unsigned layer_id, GeoLib::Raster const& raster)
{
    const unsigned pyramid_base[3][4] =
    {
        {1, 3, 4, 2}, // Point 4 missing
        {2, 4, 3, 0}, // Point 5 missing
        {0, 3, 4, 1}, // Point 6 missing
    };

    std::size_t const nNodes = dem_mesh.getNumberOfNodes();
    std::vector<MeshLib::Node*> const& nodes = dem_mesh.getNodes();
    int const last_layer_node_offset = layer_id * nNodes;

    // add nodes for new layer
    for (std::size_t i=0; i<nNodes; ++i)
        _nodes.push_back(getNewLayerNode(*nodes[i], *_nodes[last_layer_node_offset + i], raster, _nodes.size()));

    std::vector<MeshLib::Element*> const& elems = dem_mesh.getElements();
    std::size_t const nElems (dem_mesh.getNumberOfElements());

    for (std::size_t i=0; i<nElems; ++i)
    {
        MeshLib::Element* elem (elems[i]);
        if (elem->getGeomType() != MeshLib::MeshElemType::TRIANGLE)
            continue;
        unsigned node_counter(3), missing_idx(0);
        std::array<MeshLib::Node*, 6> new_elem_nodes;
        for (unsigned j=0; j<3; ++j)
        {
            new_elem_nodes[j] = _nodes[_nodes[last_layer_node_offset + elem->getNodeIndex(j)]->getID()];
            new_elem_nodes[node_counter] = (_nodes[last_layer_node_offset + elem->getNodeIndex(j) + nNodes]);
            if (new_elem_nodes[j]->getID() != new_elem_nodes[node_counter]->getID())
                node_counter++;
            else
                missing_idx = j;
        }

        switch (node_counter)
        {
        case 6:
            _elements.push_back(new MeshLib::Prism(new_elem_nodes));
            _materials.push_back(layer_id);
            break;
        case 5:
            std::array<MeshLib::Node*, 5> pyramid_nodes;
            pyramid_nodes[0] = new_elem_nodes[pyramid_base[missing_idx][0]];
            pyramid_nodes[1] = new_elem_nodes[pyramid_base[missing_idx][1]];
            pyramid_nodes[2] = new_elem_nodes[pyramid_base[missing_idx][2]];
            pyramid_nodes[3] = new_elem_nodes[pyramid_base[missing_idx][3]];
            pyramid_nodes[4] = new_elem_nodes[missing_idx];
            _elements.push_back(new MeshLib::Pyramid(pyramid_nodes));
            _materials.push_back(layer_id);
            break;
        case 4:
            std::array<MeshLib::Node*, 4> tet_nodes;
            std::copy(new_elem_nodes.begin(), new_elem_nodes.begin() + node_counter, tet_nodes.begin());
            _elements.push_back(new MeshLib::Tet(tet_nodes));
            _materials.push_back(layer_id);
            break;
        default:
            continue;
        }
    }
}

void CreateStructuredGridDialog::accept()
{
    if (inputIsEmpty())
        return;

    if ((this->xLengthEdit->text().toDouble() <= 0) ||
        (this->yLengthEdit->text().toDouble() <= 0) ||
        (this->zLengthEdit->text().toDouble() <= 0))
    {
        OGSError::box("Length needs to be larger than 0.");
        return;
    }

    if ((this->xElemEdit->text().toDouble() <= 0) ||
        (this->yElemEdit->text().toDouble() <= 0) ||
        (this->zElemEdit->text().toDouble() <= 0))
    {
        OGSError::box("Number of elements needs to be larger than 0.");
        return;
    }

    GeoLib::Point const origin(this->xOriginEdit->text().toDouble(),
                               this->yOriginEdit->text().toDouble(),
                               this->zOriginEdit->text().toDouble());
    std::string const name (this->meshNameEdit->text().toStdString());
    MeshLib::Mesh* mesh (nullptr);
    if (this->lineButton->isChecked())
        if (this->meshExtentButton->isChecked())
            mesh = MeshLib::MeshGenerator::generateLineMesh(
                this->xLengthEdit->text().toDouble(), this->xElemEdit->text().toInt(), origin, name);
        else
            mesh = MeshLib::MeshGenerator::generateLineMesh(
                this->xElemEdit->text().toInt(), this->xLengthEdit->text().toDouble(), origin, name);
    else if (this->triButton->isChecked())
        if (this->meshExtentButton->isChecked())
            mesh = MeshLib::MeshGenerator::generateRegularTriMesh(
                this->xLengthEdit->text().toDouble(), this->yLengthEdit->text().toDouble(),
                this->xElemEdit->text().toInt(), this->yElemEdit->text().toInt(),
                origin, name);
        else
            mesh = MeshLib::MeshGenerator::generateRegularTriMesh(
                this->xElemEdit->text().toInt(), this->yElemEdit->text().toInt(),
                this->xLengthEdit->text().toDouble(), this->yLengthEdit->text().toDouble(),
                origin, name);
    else if (this->quadButton->isChecked())
        if (this->meshExtentButton->isChecked())
            mesh = MeshLib::MeshGenerator::generateRegularQuadMesh(
                this->xLengthEdit->text().toDouble(), this->yLengthEdit->text().toDouble(),
                this->xElemEdit->text().toInt(), this->yElemEdit->text().toInt(),
                origin, name);
        else
            mesh = MeshLib::MeshGenerator::generateRegularQuadMesh(
                this->xElemEdit->text().toInt(), this->yElemEdit->text().toInt(),
                this->xLengthEdit->text().toDouble(), this->yLengthEdit->text().toDouble(),
                origin, name);
    else if (this->prismButton->isChecked())
        if (this->meshExtentButton->isChecked())
            mesh = MeshLib::MeshGenerator::generateRegularPrismMesh(
                this->xLengthEdit->text().toDouble(), this->yLengthEdit->text().toDouble(),
                this->zLengthEdit->text().toDouble(), this->xElemEdit->text().toInt(),
                this->yElemEdit->text().toInt(), this->zElemEdit->text().toInt(),
                origin, name);
        else
            mesh = MeshLib::MeshGenerator::generateRegularPrismMesh(
                this->xLengthEdit->text().toDouble(), this->yLengthEdit->text().toDouble(),
                this->zLengthEdit->text().toDouble(), this->xElemEdit->text().toInt(),
                this->yElemEdit->text().toInt(), this->zElemEdit->text().toInt(),
                origin, name);
    else if (this->hexButton->isChecked())
        if (this->meshExtentButton->isChecked())
            mesh = MeshLib::MeshGenerator::generateRegularHexMesh(
                this->xLengthEdit->text().toDouble(), this->yLengthEdit->text().toDouble(),
                this->zLengthEdit->text().toDouble(), this->xElemEdit->text().toInt(),
                this->yElemEdit->text().toInt(), this->zElemEdit->text().toInt(),
                origin, name);
        else
            mesh = MeshLib::MeshGenerator::generateRegularHexMesh(
                this->xElemEdit->text().toInt(), this->yElemEdit->text().toInt(),
                this->zElemEdit->text().toInt(), this->xLengthEdit->text().toDouble(),
                this->yLengthEdit->text().toDouble(), this->zLengthEdit->text().toDouble(),
                origin, name);

    if (mesh == nullptr)
    {
        OGSError::box("Error creating mesh.");
        return;
    }

    boost::optional<MeshLib::PropertyVector<int>&> mat_ids (
        mesh->getProperties().createNewPropertyVector<int>("MaterialIDs", MeshLib::MeshItemType::Cell));
    mat_ids->reserve(mesh->getNumberOfElements());
    std::fill_n(std::back_inserter(*mat_ids), mesh->getNumberOfElements(), 0);
    emit meshAdded(mesh);
    this->done(QDialog::Accepted);
}