mesh_utils.cc
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Created: Fri, Feb 21, 07:45

mesh_utils.cc
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	/**
	* @file mesh_utils.cc
	*
	* @author Guillaume Anciaux <guillaume.anciaux@epfl.ch>
	* @author Leonardo Snozzi <leonardo.snozzi@epfl.ch>
	* @author Marco Vocialta <marco.vocialta@epfl.ch>
	* @author Dana Christen <dana.christen@epfl.ch>
	* @author David Simon Kammer <david.kammer@epfl.ch>
	* @author Nicolas Richart <nicolas.richart@epfl.ch>
	*
	* @date creation: Fri Aug 20 2010
	* @date last modification: Mon Jun 09 2014
	*
	* @brief All mesh utils necessary for various tasks
	*
	* @section LICENSE
	*
	* Copyright (©) 2010-2012, 2014 EPFL (Ecole Polytechnique Fédérale de Lausanne)
	* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
	*
	* Akantu 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 3 of the License, or (at your option) any
	* later version.
	*
	* Akantu 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 Akantu. If not, see <http://www.gnu.org/licenses/>.
	*
	*/

	/* -------------------------------------------------------------------------- */
	#include "mesh_utils.hh"
	#include "aka_safe_enum.hh"
	#include "fe_engine.hh"
	/* -------------------------------------------------------------------------- */
	#include <numeric>
	/* -------------------------------------------------------------------------- */

	__BEGIN_AKANTU__


	/* -------------------------------------------------------------------------- */
	void MeshUtils::buildNode2Elements(const Mesh & mesh,
	CSR<Element> & node_to_elem,
	UInt spatial_dimension) {
	AKANTU_DEBUG_IN();
	if (spatial_dimension == _all_dimensions) spatial_dimension = mesh.getSpatialDimension();


	/// count number of occurrence of each node
	UInt nb_nodes = mesh.getNbNodes();

	/// array for the node-element list
	node_to_elem.resizeRows(nb_nodes);
	node_to_elem.clearRows();

	AKANTU_DEBUG_ASSERT(mesh.firstType(spatial_dimension) !=
	mesh.lastType(spatial_dimension),
	"Some elements must be found in right dimension to compute facets!");

	for (ghost_type_t::iterator gt = ghost_type_t::begin(); gt != ghost_type_t::end(); ++gt) {
	Mesh::type_iterator first = mesh.firstType(spatial_dimension, *gt, _ek_not_defined);
	Mesh::type_iterator last = mesh.lastType(spatial_dimension, *gt, _ek_not_defined);

	for (; first != last; ++first) {
	ElementType type = *first;
	UInt nb_element = mesh.getNbElement(type, *gt);
	Array<UInt>::const_iterator< Vector<UInt> > conn_it =
	mesh.getConnectivity(type, *gt).begin(Mesh::getNbNodesPerElement(type));

	for (UInt el = 0; el < nb_element; ++el, ++conn_it)
	for (UInt n = 0; n < conn_it->size(); ++n)
	++node_to_elem.rowOffset((*conn_it)(n));
	}
	}

	node_to_elem.countToCSR();
	node_to_elem.resizeCols();


	/// rearrange element to get the node-element list
	Element e;
	node_to_elem.beginInsertions();

	for (ghost_type_t::iterator gt = ghost_type_t::begin(); gt != ghost_type_t::end(); ++gt) {
	Mesh::type_iterator first = mesh.firstType(spatial_dimension, *gt, _ek_not_defined);
	Mesh::type_iterator last = mesh.lastType(spatial_dimension, *gt, _ek_not_defined);
	e.ghost_type = *gt;
	for (; first != last; ++first) {
	ElementType type = *first;
	e.type = type;
	e.kind = Mesh::getKind(type);
	UInt nb_element = mesh.getNbElement(type, *gt);
	Array<UInt>::const_iterator< Vector<UInt> > conn_it =
	mesh.getConnectivity(type, *gt).begin(Mesh::getNbNodesPerElement(type));

	for (UInt el = 0; el < nb_element; ++el, ++conn_it) {
	e.element = el;
	for (UInt n = 0; n < conn_it->size(); ++n)
	node_to_elem.insertInRow((*conn_it)(n), e);
	}
	}
	}

	node_to_elem.endInsertions();

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	/**
	* This function should disappear in the future (used in mesh partitioning)
	*/
	void MeshUtils::buildNode2Elements(const Mesh & mesh,
	CSR<UInt> & node_to_elem,
	UInt spatial_dimension) {
	AKANTU_DEBUG_IN();
	if (spatial_dimension == _all_dimensions) spatial_dimension = mesh.getSpatialDimension();
	UInt nb_nodes = mesh.getNbNodes();

	const Mesh::ConnectivityTypeList & type_list = mesh.getConnectivityTypeList();
	Mesh::ConnectivityTypeList::const_iterator it;

	UInt nb_types = type_list.size();
	UInt nb_good_types = 0;

	UInt nb_nodes_per_element[nb_types];

	UInt * conn_val[nb_types];
	UInt nb_element[nb_types];


	for(it = type_list.begin(); it != type_list.end(); ++it) {
	ElementType type = *it;
	if(Mesh::getSpatialDimension(type) != spatial_dimension) continue;

	nb_nodes_per_element[nb_good_types] = Mesh::getNbNodesPerElement(type);
	conn_val[nb_good_types] = mesh.getConnectivity(type, _not_ghost).storage();
	nb_element[nb_good_types] = mesh.getConnectivity(type, _not_ghost).getSize();
	nb_good_types++;
	}

	AKANTU_DEBUG_ASSERT(nb_good_types != 0,
	"Some elements must be found in right dimension to compute facets!");

	/// array for the node-element list
	node_to_elem.resizeRows(nb_nodes);
	node_to_elem.clearRows();

	/// count number of occurrence of each node
	for (UInt t = 0; t < nb_good_types; ++t) {
	for (UInt el = 0; el < nb_element[t]; ++el) {
	UInt el_offset = el*nb_nodes_per_element[t];
	for (UInt n = 0; n < nb_nodes_per_element[t]; ++n) {
	++node_to_elem.rowOffset(conn_val[t][el_offset + n]);
	}
	}
	}

	node_to_elem.countToCSR();
	node_to_elem.resizeCols();
	node_to_elem.beginInsertions();

	/// rearrange element to get the node-element list
	for (UInt t = 0, linearized_el = 0; t < nb_good_types; ++t)
	for (UInt el = 0; el < nb_element[t]; ++el, ++linearized_el) {
	UInt el_offset = el*nb_nodes_per_element[t];
	for (UInt n = 0; n < nb_nodes_per_element[t]; ++n)
	node_to_elem.insertInRow(conn_val[t][el_offset + n], linearized_el);
	}

	node_to_elem.endInsertions();

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void MeshUtils::buildNode2ElementsElementTypeMap(const Mesh & mesh,
	CSR<UInt> & node_to_elem,
	const ElementType & type,
	const GhostType & ghost_type) {
	AKANTU_DEBUG_IN();
	UInt nb_nodes = mesh.getNbNodes();

	UInt nb_nodes_per_element = Mesh::getNbNodesPerElement(type);
	UInt nb_elements = mesh.getConnectivity(type, ghost_type).getSize();

	UInt * conn_val = mesh.getConnectivity(type, ghost_type).storage();

	/// array for the node-element list
	node_to_elem.resizeRows(nb_nodes);
	node_to_elem.clearRows();

	/// count number of occurrence of each node
	for (UInt el = 0; el < nb_elements; ++el) {
	UInt el_offset = el*nb_nodes_per_element;
	for (UInt n = 0; n < nb_nodes_per_element; ++n)
	++node_to_elem.rowOffset(conn_val[el_offset + n]);
	}

	/// convert the occurrence array in a csr one
	node_to_elem.countToCSR();

	node_to_elem.resizeCols();
	node_to_elem.beginInsertions();

	/// save the element index in the node-element list
	for (UInt el = 0; el < nb_elements; ++el) {
	UInt el_offset = el*nb_nodes_per_element;
	for (UInt n = 0; n < nb_nodes_per_element; ++n) {
	node_to_elem.insertInRow(conn_val[el_offset + n], el);
	}
	}

	node_to_elem.endInsertions();

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void MeshUtils::buildFacets(Mesh & mesh){
	AKANTU_DEBUG_IN();

	UInt spatial_dimension = mesh.getSpatialDimension();

	for (ghost_type_t::iterator gt = ghost_type_t::begin();
	gt != ghost_type_t::end(); ++gt) {
	GhostType gt_facet = *gt;
	Mesh::type_iterator it = mesh.firstType(spatial_dimension - 1, gt_facet);
	Mesh::type_iterator end = mesh.lastType(spatial_dimension - 1, gt_facet);
	for(; it != end; ++it) {
	mesh.getConnectivity(it, gt).resize(0);
	// \todo inform the mesh event handler
	}
	}

	buildFacetsDimension(mesh,
	mesh,
	true,
	spatial_dimension);

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void MeshUtils::buildAllFacets(const Mesh & mesh,
	Mesh & mesh_facets,
	UInt to_dimension,
	DistributedSynchronizer * synchronizer) {
	AKANTU_DEBUG_IN();

	UInt spatial_dimension = mesh.getSpatialDimension();

	buildAllFacets(mesh, mesh_facets, spatial_dimension, to_dimension, synchronizer);

	AKANTU_DEBUG_OUT();
	}
	/* -------------------------------------------------------------------------- */
	void MeshUtils::buildAllFacets(const Mesh & mesh,
	Mesh & mesh_facets,
	UInt from_dimension,
	UInt to_dimension,
	DistributedSynchronizer * synchronizer) {
	AKANTU_DEBUG_IN();

	AKANTU_DEBUG_ASSERT(mesh_facets.isMeshFacets(),
	"The mesh_facets should be initialized with initMeshFacets");

	const ElementTypeMapArray<UInt> * prank_to_element = NULL;

	if (synchronizer) {
	synchronizer->buildPrankToElement();
	prank_to_element = &synchronizer->getPrankToElement();
	}

	/// generate facets
	buildFacetsDimension(mesh,
	mesh_facets,
	false,
	from_dimension,
	prank_to_element);

	/// copy nodes type
	mesh_facets.nodes_type.resize(mesh.nodes_type.getSize());
	mesh_facets.nodes_type.copy(mesh.nodes_type);

	/// sort facets and generate subfacets
	for (UInt i = from_dimension - 1; i > to_dimension; --i) {
	buildFacetsDimension(mesh_facets,
	mesh_facets,
	false,
	i,
	prank_to_element);
	}

	AKANTU_DEBUG_OUT();
	}


	/* -------------------------------------------------------------------------- */
	void MeshUtils::buildFacetsDimension(const Mesh & mesh,
	Mesh & mesh_facets,
	bool boundary_only,
	UInt dimension,
	const ElementTypeMapArray<UInt> * prank_to_element){
	AKANTU_DEBUG_IN();

	// save the current parent of mesh_facets and set it temporarly to mesh since
	// mesh is the one containing the elements for which mesh_facets has the subelements
	// example: if the function is called with mesh = mesh_facets
	const Mesh & mesh_facets_parent = mesh_facets.getMeshParent();
	mesh_facets.defineMeshParent(mesh);

	UInt spatial_dimension = mesh.getSpatialDimension();

	const Array<Real> & mesh_facets_nodes = mesh_facets.getNodes();
	const Array<Real>::const_vector_iterator mesh_facets_nodes_it =
	mesh_facets_nodes.begin(spatial_dimension);

	CSR<Element> node_to_elem;
	buildNode2Elements(mesh, node_to_elem, dimension);

	Array<UInt> counter;


	Element current_element;
	for (ghost_type_t::iterator gt = ghost_type_t::begin(); gt != ghost_type_t::end(); ++gt) {
	GhostType ghost_type = *gt;
	GhostType facet_ghost_type = ghost_type;

	current_element.ghost_type = ghost_type;
	Mesh::type_iterator first = mesh.firstType(dimension, ghost_type);
	Mesh::type_iterator last = mesh.lastType(dimension, ghost_type);

	for(; first != last; ++first) {
	ElementType type = *first;
	ElementType facet_type = mesh.getFacetType(type);

	current_element.type = type;

	UInt nb_element = mesh.getNbElement(type, ghost_type);
	Array< std::vector<Element> > * element_to_subelement =
	mesh_facets.getElementToSubelementPointer(facet_type, ghost_type);
	Array<UInt> * connectivity_facets =
	mesh_facets.getConnectivityPointer(facet_type, ghost_type);

	for (UInt el = 0; el < nb_element; ++el) {
	current_element.element = el;
	Matrix<UInt> facets = mesh.getFacetConnectivity(el, type, ghost_type);
	UInt nb_nodes_per_facet = facets.cols();

	for (UInt f = 0; f < facets.rows(); ++f) {
	Vector<UInt> facet(nb_nodes_per_facet);
	for (UInt n = 0; n < nb_nodes_per_facet; ++n) facet(n) = facets(f, n);

	UInt first_node_nb_elements = node_to_elem.getNbCols(facets(f, 0));
	counter.resize(first_node_nb_elements);
	counter.clear();

	//loop over the other nodes to search intersecting elements,
	//which are the elements that share another node with the
	//starting element after first_node
	CSR<Element>::iterator first_node_elements = node_to_elem.begin(facet(0));
	CSR<Element>::iterator first_node_elements_end = node_to_elem.end(facet(0));
	UInt local_el = 0;
	for (; first_node_elements != first_node_elements_end;
	++first_node_elements, ++local_el) {
	for (UInt n = 1; n < nb_nodes_per_facet; ++n) {
	CSR<Element>::iterator node_elements_begin = node_to_elem.begin(facet(n));
	CSR<Element>::iterator node_elements_end = node_to_elem.end (facet(n));
	counter(local_el) += std::count(node_elements_begin,
	node_elements_end,
	*first_node_elements);
	}
	}

	// counting the number of elements connected to the facets and
	// taking the minimum element number, because the facet should
	// be inserted just once
	UInt nb_element_connected_to_facet = 0;
	Element minimum_el = ElementNull;
	Array<Element> connected_elements;
	for (UInt el_f = 0; el_f < first_node_nb_elements; el_f++) {
	Element real_el = node_to_elem(facet(0), el_f);
	if (counter(el_f) == nb_nodes_per_facet - 1) {
	++nb_element_connected_to_facet;
	minimum_el = std::min(minimum_el, real_el);
	connected_elements.push_back(real_el);
	}
	}

	if (minimum_el == current_element) {
	bool full_ghost_facet = false;

	UInt n = 0;
	while (n < nb_nodes_per_facet && mesh.isPureGhostNode(facet(n))) ++n;
	if (n == nb_nodes_per_facet) full_ghost_facet = true;

	if (!full_ghost_facet) {
	if (!boundary_only \|\| (boundary_only && nb_element_connected_to_facet == 1)) {

	std::vector<Element> elements;

	// build elements_on_facets: linearized_el must come first
	// in order to store the facet in the correct direction
	// and avoid to invert the sign in the normal computation
	elements.push_back(current_element);

	/// boundary facet
	if (nb_element_connected_to_facet == 1)
	elements.push_back(ElementNull);
	/// internal facet
	else if (nb_element_connected_to_facet == 2) {
	elements.push_back(connected_elements(1));

	/// check if facet is in between ghost and normal
	/// elements: if it's the case, the facet is either
	/// ghost or not ghost. The criterion to decide this
	/// is arbitrary. It was chosen to check the processor
	/// id (prank) of the two neighboring elements. If
	/// prank of the ghost element is lower than prank of
	/// the normal one, the facet is not ghost, otherwise
	/// it's ghost
	GhostType gt[2] = { _not_ghost, _not_ghost };
	for (UInt el = 0; el < connected_elements.getSize(); ++el)
	gt[el] = connected_elements(el).ghost_type;

	if (gt[0] + gt[1] == 1) {
	if (prank_to_element) {
	UInt prank[2];
	for (UInt el = 0; el < 2; ++el) {
	UInt current_el = connected_elements(el).element;
	ElementType current_type = connected_elements(el).type;
	GhostType current_gt = connected_elements(el).ghost_type;

	const Array<UInt> & prank_to_el
	= (*prank_to_element)(current_type, current_gt);

	prank[el] = prank_to_el(current_el);
	}

	bool ghost_one = (gt[0] != _ghost);

	if (prank[ghost_one] > prank[!ghost_one])
	facet_ghost_type = _not_ghost;
	else
	facet_ghost_type = _ghost;

	connectivity_facets = mesh_facets.getConnectivityPointer(facet_type, facet_ghost_type);
	element_to_subelement = mesh_facets.getElementToSubelementPointer(facet_type, facet_ghost_type);
	}
	}
	}
	/// facet of facet
	else {
	for (UInt i = 1; i < nb_element_connected_to_facet; ++i) {
	elements.push_back(connected_elements(i));
	}
	}

	element_to_subelement->push_back(elements);
	connectivity_facets->push_back(facet);

	/// current facet index
	UInt current_facet = connectivity_facets->getSize() - 1;

	/// loop on every element connected to current facet and
	/// insert current facet in the first free spot of the
	/// subelement_to_element vector
	for (UInt elem = 0; elem < elements.size(); ++elem) {
	Element loc_el = elements[elem];

	if (loc_el.type != _not_defined) {

	Array<Element> & subelement_to_element =
	*mesh_facets.getSubelementToElementPointer(type, loc_el.ghost_type);

	for (UInt f_in = 0; f_in < facets.rows(); ++f_in) {
	if (subelement_to_element(loc_el.element, f_in).type == _not_defined) {
	subelement_to_element(loc_el.element, f_in).type = facet_type;
	subelement_to_element(loc_el.element, f_in).element = current_facet;
	subelement_to_element(loc_el.element, f_in).ghost_type = facet_ghost_type;
	break;
	}
	}
	}
	}

	/// reset connectivity in case a facet was found in
	/// between ghost and normal elements
	if (facet_ghost_type != ghost_type) {
	facet_ghost_type = ghost_type;
	connectivity_facets = mesh_facets.getConnectivityPointer(facet_type, facet_ghost_type);
	element_to_subelement = mesh_facets.getElementToSubelementPointer(facet_type, facet_ghost_type);
	}
	}
	}
	}
	}
	}
	}
	}

	// restore the parent of mesh_facet
	mesh_facets.defineMeshParent(mesh_facets_parent);

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void MeshUtils::renumberMeshNodes(Mesh & mesh,
	UInt * local_connectivities,
	UInt nb_local_element,
	UInt nb_ghost_element,
	ElementType type,
	Array<UInt> & old_nodes_numbers) {
	AKANTU_DEBUG_IN();

	UInt nb_nodes_per_element = Mesh::getNbNodesPerElement(type);

	std::map<UInt, UInt> renumbering_map;
	for (UInt i = 0; i < old_nodes_numbers.getSize(); ++i) {
	renumbering_map[old_nodes_numbers(i)] = i;
	}

	/// renumber the nodes
	renumberNodesInConnectivity(local_connectivities,
	(nb_local_element + nb_ghost_element)*nb_nodes_per_element,
	renumbering_map);

	std::map<UInt, UInt>::iterator it = renumbering_map.begin();
	std::map<UInt, UInt>::iterator end = renumbering_map.end();
	old_nodes_numbers.resize(renumbering_map.size());
	for (;it != end; ++it) {
	old_nodes_numbers(it->second) = it->first;
	}
	renumbering_map.clear();

	/// copy the renumbered connectivity to the right place
	Array<UInt> * local_conn = mesh.getConnectivityPointer(type);
	local_conn->resize(nb_local_element);
	memcpy(local_conn->storage(),
	local_connectivities,
	nb_local_element * nb_nodes_per_element * sizeof(UInt));

	Array<UInt> * ghost_conn = mesh.getConnectivityPointer(type, _ghost);
	ghost_conn->resize(nb_ghost_element);
	memcpy(ghost_conn->storage(),
	local_connectivities + nb_local_element * nb_nodes_per_element,
	nb_ghost_element * nb_nodes_per_element * sizeof(UInt));

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void MeshUtils::renumberNodesInConnectivity(UInt * list_nodes,
	UInt nb_nodes,
	std::map<UInt, UInt> & renumbering_map) {
	AKANTU_DEBUG_IN();

	UInt * connectivity = list_nodes;
	UInt new_node_num = renumbering_map.size();
	for (UInt n = 0; n < nb_nodes; ++n, ++connectivity) {
	UInt & node = *connectivity;
	std::map<UInt, UInt>::iterator it = renumbering_map.find(node);
	if(it == renumbering_map.end()) {
	UInt old_node = node;
	renumbering_map[old_node] = new_node_num;
	node = new_node_num;
	++new_node_num;
	} else {
	node = it->second;
	}
	}

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void MeshUtils::purifyMesh(Mesh & mesh) {
	AKANTU_DEBUG_IN();

	std::map<UInt, UInt> renumbering_map;

	RemovedNodesEvent remove_nodes(mesh);
	Array<UInt> & nodes_removed = remove_nodes.getList();

	for (UInt gt = _not_ghost; gt <= _ghost; ++gt) {
	GhostType ghost_type = (GhostType) gt;

	Mesh::type_iterator it = mesh.firstType(_all_dimensions, ghost_type, _ek_not_defined);
	Mesh::type_iterator end = mesh.lastType(_all_dimensions, ghost_type, _ek_not_defined);
	for(; it != end; ++it) {

	ElementType type(*it);
	UInt nb_nodes_per_element = Mesh::getNbNodesPerElement(type);

	const Array<UInt> & connectivity_vect = mesh.getConnectivity(type, ghost_type);
	UInt nb_element(connectivity_vect.getSize());
	UInt * connectivity = connectivity_vect.storage();

	renumberNodesInConnectivity (connectivity, nb_element*nb_nodes_per_element, renumbering_map);
	}
	}

	Array<UInt> & new_numbering = remove_nodes.getNewNumbering();
	std::fill(new_numbering.begin(), new_numbering.end(), UInt(-1));

	std::map<UInt, UInt>::iterator it = renumbering_map.begin();
	std::map<UInt, UInt>::iterator end = renumbering_map.end();
	for (; it != end; ++it) {
	new_numbering(it->first) = it->second;
	}


	for (UInt i = 0; i < new_numbering.getSize(); ++i) {
	if(new_numbering(i) == UInt(-1))
	nodes_removed.push_back(i);
	}

	mesh.sendEvent(remove_nodes);

	AKANTU_DEBUG_OUT();
	}

	#if defined(AKANTU_COHESIVE_ELEMENT)
	/* -------------------------------------------------------------------------- */
	void MeshUtils::insertCohesiveElements(Mesh & mesh,
	Mesh & mesh_facets,
	const ElementTypeMapArray<bool> & facet_insertion,
	Array<UInt> & doubled_nodes,
	Array<Element> & new_elements) {
	AKANTU_DEBUG_IN();

	UInt spatial_dimension = mesh.getSpatialDimension();

	if (updateFacetToDouble(mesh_facets, facet_insertion)) {

	if (spatial_dimension == 1) {
	doublePointFacet(mesh, mesh_facets, doubled_nodes);
	}
	else {
	doubleFacet(mesh, mesh_facets, spatial_dimension - 1,
	doubled_nodes, true);
	findSubfacetToDouble<false>(mesh, mesh_facets);

	if (spatial_dimension == 2) {
	doubleSubfacet<2>(mesh, mesh_facets, doubled_nodes);
	}
	else if (spatial_dimension == 3) {
	doubleFacet(mesh, mesh_facets, 1, doubled_nodes, false);
	findSubfacetToDouble<true>(mesh, mesh_facets);
	doubleSubfacet<3>(mesh, mesh_facets, doubled_nodes);
	}
	}

	updateCohesiveData(mesh, mesh_facets, new_elements);
	}

	AKANTU_DEBUG_OUT();
	}
	#endif

	/* -------------------------------------------------------------------------- */
	void MeshUtils::doubleNodes(Mesh & mesh,
	const Array<UInt> & old_nodes,
	Array<UInt> & doubled_nodes) {
	AKANTU_DEBUG_IN();

	Array<Real> & position = mesh.getNodes();
	UInt spatial_dimension = mesh.getSpatialDimension();

	UInt old_nb_nodes = position.getSize();
	UInt new_nb_nodes = old_nb_nodes + old_nodes.getSize();

	UInt old_nb_doubled_nodes = doubled_nodes.getSize();
	UInt new_nb_doubled_nodes = old_nb_doubled_nodes + old_nodes.getSize();

	position.resize(new_nb_nodes);
	doubled_nodes.resize(new_nb_doubled_nodes);

	Array<Real>::iterator<Vector<Real> > position_begin
	= position.begin(spatial_dimension);

	for (UInt n = 0; n < old_nodes.getSize(); ++n) {
	UInt new_node = old_nb_nodes + n;

	/// store doubled nodes
	doubled_nodes(old_nb_doubled_nodes + n, 0) = old_nodes(n);
	doubled_nodes(old_nb_doubled_nodes + n, 1) = new_node;

	/// update position
	std::copy(position_begin + old_nodes(n),
	position_begin + old_nodes(n) + 1,
	position_begin + new_node);
	}

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void MeshUtils::doubleFacet(Mesh & mesh,
	Mesh & mesh_facets,
	UInt facet_dimension,
	Array<UInt> & doubled_nodes,
	bool facet_mode) {
	AKANTU_DEBUG_IN();

	for (ghost_type_t::iterator gt = ghost_type_t::begin();
	gt != ghost_type_t::end(); ++gt) {

	GhostType gt_facet = *gt;

	Mesh::type_iterator it = mesh_facets.firstType(facet_dimension, gt_facet);
	Mesh::type_iterator end = mesh_facets.lastType(facet_dimension, gt_facet);

	for(; it != end; ++it) {

	ElementType type_facet = *it;

	Array<UInt> & f_to_double = mesh_facets.getData<UInt>("facet_to_double",
	type_facet,
	gt_facet);
	UInt nb_facet_to_double = f_to_double.getSize();

	if (nb_facet_to_double == 0) continue;

	ElementType type_subfacet = Mesh::getFacetType(type_facet);
	const UInt nb_subfacet_per_facet = Mesh::getNbFacetsPerElement(type_facet);
	GhostType gt_subfacet = _casper;
	Array<std::vector<Element> > * f_to_subfacet = NULL;

	Array<Element> & subfacet_to_facet
	= mesh_facets.getSubelementToElement(type_facet, gt_facet);

	Array<UInt> & conn_facet = mesh_facets.getConnectivity(type_facet, gt_facet);
	UInt nb_nodes_per_facet = conn_facet.getNbComponent();

	UInt old_nb_facet = conn_facet.getSize();
	UInt new_nb_facet = old_nb_facet + nb_facet_to_double;

	conn_facet.resize(new_nb_facet);
	subfacet_to_facet.resize(new_nb_facet);

	UInt new_facet = old_nb_facet - 1;
	Element new_facet_el(type_facet, 0, gt_facet);

	Array<Element>::iterator<Vector<Element> > subfacet_to_facet_begin
	= subfacet_to_facet.begin(nb_subfacet_per_facet);
	Array<UInt>::iterator<Vector<UInt> > conn_facet_begin
	= conn_facet.begin(nb_nodes_per_facet);

	for (UInt facet = 0; facet < nb_facet_to_double; ++facet) {
	UInt old_facet = f_to_double(facet);
	++new_facet;

	/// adding a new facet by copying original one

	/// copy connectivity in new facet
	std::copy(conn_facet_begin + old_facet,
	conn_facet_begin + old_facet + 1,
	conn_facet_begin + new_facet);

	/// update subfacet_to_facet
	std::copy(subfacet_to_facet_begin + old_facet,
	subfacet_to_facet_begin + old_facet + 1,
	subfacet_to_facet_begin + new_facet);

	new_facet_el.element = new_facet;

	/// loop on every subfacet
	for (UInt sf = 0; sf < nb_subfacet_per_facet; ++sf) {
	Element & subfacet = subfacet_to_facet(old_facet, sf);
	if (subfacet == ElementNull) continue;

	if (gt_subfacet != subfacet.ghost_type) {
	gt_subfacet = subfacet.ghost_type;
	f_to_subfacet = & mesh_facets.getElementToSubelement(type_subfacet,
	subfacet.ghost_type);
	}

	/// update facet_to_subfacet array
	(*f_to_subfacet)(subfacet.element).push_back(new_facet_el);
	}
	}

	/// update facet_to_subfacet and _segment_3 facets if any
	if (!facet_mode) {
	updateSubfacetToFacet(mesh_facets, type_facet, gt_facet, true);
	updateFacetToSubfacet(mesh_facets, type_facet, gt_facet, true);
	updateQuadraticSegments<true>(mesh, mesh_facets, type_facet,
	gt_facet, doubled_nodes);
	}
	else
	updateQuadraticSegments<false>(mesh, mesh_facets, type_facet,
	gt_facet, doubled_nodes);
	}
	}

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	bool MeshUtils::updateFacetToDouble(Mesh & mesh_facets,
	const ElementTypeMapArray<bool> & facet_insertion) {
	AKANTU_DEBUG_IN();

	UInt spatial_dimension = mesh_facets.getSpatialDimension();
	bool facets_to_double = false;

	for (ghost_type_t::iterator gt = ghost_type_t::begin();
	gt != ghost_type_t::end(); ++gt) {

	GhostType gt_facet = *gt;

	Mesh::type_iterator it = mesh_facets.firstType(spatial_dimension - 1, gt_facet);
	Mesh::type_iterator end = mesh_facets.lastType(spatial_dimension - 1, gt_facet);

	for(; it != end; ++it) {

	ElementType type_facet = *it;

	const Array<bool> & f_insertion = facet_insertion(type_facet, gt_facet);
	Array<UInt> & f_to_double = mesh_facets.getData<UInt>("facet_to_double",
	type_facet,
	gt_facet);

	Array< std::vector<Element> > & element_to_facet
	= mesh_facets.getElementToSubelement(type_facet, gt_facet);

	ElementType el_type = _not_defined;
	GhostType el_gt = _casper;
	UInt nb_facet_per_element = 0;
	Element old_facet_el(type_facet, 0, gt_facet);

	Array<Element> * facet_to_element = NULL;

	for (UInt f = 0; f < f_insertion.getSize(); ++f) {

	if (f_insertion(f) == false) continue;

	facets_to_double = true;

	if (element_to_facet(f)[1].type == _not_defined
	#if defined(AKANTU_COHESIVE_ELEMENT)
	\|\| element_to_facet(f)[1].kind == _ek_cohesive
	#endif
	) {
	AKANTU_DEBUG_WARNING("attempt to double a facet on the boundary");
	continue;
	}

	f_to_double.push_back(f);

	UInt new_facet =
	mesh_facets.getNbElement(type_facet, gt_facet) + f_to_double.getSize() - 1;
	old_facet_el.element = f;

	/// update facet_to_element vector
	Element & elem_to_update = element_to_facet(f)[1];
	UInt el = elem_to_update.element;

	if (elem_to_update.ghost_type != el_gt \|\| elem_to_update.type != el_type) {
	el_type = elem_to_update.type;
	el_gt = elem_to_update.ghost_type;
	facet_to_element = & mesh_facets.getSubelementToElement(el_type, el_gt);
	nb_facet_per_element = facet_to_element->getNbComponent();
	}

	Element * f_update
	= std::find(facet_to_element->storage() + el * nb_facet_per_element,
	facet_to_element->storage() + el * nb_facet_per_element
	+ nb_facet_per_element,
	old_facet_el);

	AKANTU_DEBUG_ASSERT(facet_to_element->storage() + el * nb_facet_per_element !=
	facet_to_element->storage() + el * nb_facet_per_element
	+ nb_facet_per_element,
	"Facet not found");

	f_update->element = new_facet;

	/// update elements connected to facet
	std::vector<Element> first_facet_list = element_to_facet(f);
	element_to_facet.push_back(first_facet_list);

	/// set new and original facets as boundary facets
	element_to_facet(new_facet)[0] = element_to_facet(new_facet)[1];

	element_to_facet(f)[1] = ElementNull;
	element_to_facet(new_facet)[1] = ElementNull;
	}
	}
	}

	AKANTU_DEBUG_OUT();
	return facets_to_double;
	}

	/* -------------------------------------------------------------------------- */
	void MeshUtils::resetFacetToDouble(Mesh & mesh_facets) {
	AKANTU_DEBUG_IN();

	for(UInt g = _not_ghost; g <= _ghost; ++g) {
	GhostType gt = (GhostType) g;

	Mesh::type_iterator it = mesh_facets.firstType(_all_dimensions, gt);
	Mesh::type_iterator end = mesh_facets.lastType(_all_dimensions, gt);
	for(; it != end; ++it) {
	ElementType type = *it;
	mesh_facets.getDataPointer<UInt>("facet_to_double", type, gt, 1, false);

	mesh_facets.getDataPointer<std::vector<Element> >
	("facets_to_subfacet_double", type, gt, 1, false);

	mesh_facets.getDataPointer<std::vector<Element> >
	("elements_to_subfacet_double", type, gt, 1, false);

	mesh_facets.getDataPointer<std::vector<Element> >
	("subfacets_to_subsubfacet_double", type, gt, 1, false);
	}
	}

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	template <bool subsubfacet_mode>
	void MeshUtils::findSubfacetToDouble(Mesh & mesh, Mesh & mesh_facets) {
	AKANTU_DEBUG_IN();

	UInt spatial_dimension = mesh_facets.getSpatialDimension();
	if (spatial_dimension == 1) return;

	for (ghost_type_t::iterator gt = ghost_type_t::begin();
	gt != ghost_type_t::end(); ++gt) {

	GhostType gt_facet = *gt;

	Mesh::type_iterator it = mesh_facets.firstType(spatial_dimension - 1, gt_facet);
	Mesh::type_iterator end = mesh_facets.lastType(spatial_dimension - 1, gt_facet);

	for(; it != end; ++it) {

	ElementType type_facet = *it;

	Array<UInt> & f_to_double = mesh_facets.getData<UInt>("facet_to_double",
	type_facet,
	gt_facet);
	UInt nb_facet_to_double = f_to_double.getSize();
	if (nb_facet_to_double == 0) continue;

	ElementType type_subfacet = Mesh::getFacetType(type_facet);
	GhostType gt_subfacet = _casper;

	ElementType type_subsubfacet = Mesh::getFacetType(type_subfacet);
	GhostType gt_subsubfacet = _casper;

	Array<UInt> * conn_subfacet = NULL;
	Array<UInt> * sf_to_double = NULL;
	Array<std::vector<Element> > * sf_to_subfacet_double = NULL;
	Array<std::vector<Element> > * f_to_subfacet_double = NULL;
	Array<std::vector<Element> > * el_to_subfacet_double = NULL;

	UInt nb_subfacet = Mesh::getNbFacetsPerElement(type_facet);

	UInt nb_subsubfacet;
	UInt nb_nodes_per_sf_el;

	if (subsubfacet_mode) {
	nb_nodes_per_sf_el = Mesh::getNbNodesPerElement(type_subsubfacet);
	nb_subsubfacet = Mesh::getNbFacetsPerElement(type_subfacet);
	}
	else
	nb_nodes_per_sf_el = Mesh::getNbNodesPerElement(type_subfacet);

	Array<Element> & subfacet_to_facet
	= mesh_facets.getSubelementToElement(type_facet, gt_facet);

	Array< std::vector<Element> > & element_to_facet
	= mesh_facets.getElementToSubelement(type_facet, gt_facet);

	Array<Element> * subsubfacet_to_subfacet = NULL;

	UInt old_nb_facet = subfacet_to_facet.getSize() - nb_facet_to_double;

	Element current_facet(type_facet, 0, gt_facet);
	std::vector<Element> element_list;
	std::vector<Element> facet_list;
	std::vector<Element> * subfacet_list;
	if (subsubfacet_mode)
	subfacet_list = new std::vector<Element>;

	/// map to filter subfacets
	Array< std::vector<Element> > * facet_to_subfacet = NULL;

	/// this is used to make sure that both new and old facets are
	/// checked
	UInt facets[2];

	/// loop on every facet
	for (UInt f_index = 0; f_index < 2; ++f_index) {
	for (UInt facet = 0; facet < nb_facet_to_double; ++facet) {
	facets[bool(f_index)] = f_to_double(facet);
	facets[!bool(f_index)] = old_nb_facet + facet;

	UInt old_facet = facets[0];
	UInt new_facet = facets[1];

	Element & starting_element = element_to_facet(new_facet)[0];
	current_facet.element = old_facet;

	/// loop on every subfacet
	for (UInt sf = 0; sf < nb_subfacet; ++sf) {

	Element & subfacet = subfacet_to_facet(old_facet, sf);
	if (subfacet == ElementNull) continue;

	if (gt_subfacet != subfacet.ghost_type) {
	gt_subfacet = subfacet.ghost_type;

	if (subsubfacet_mode) {
	subsubfacet_to_subfacet
	= & mesh_facets.getSubelementToElement(type_subfacet,
	gt_subfacet);
	}
	else {
	conn_subfacet = & mesh_facets.getConnectivity(type_subfacet,
	gt_subfacet);
	sf_to_double = & mesh_facets.getData<UInt>("facet_to_double",
	type_subfacet,
	gt_subfacet);

	f_to_subfacet_double
	= & mesh_facets.getData<std::vector<Element> >("facets_to_subfacet_double",
	type_subfacet,
	gt_subfacet);

	el_to_subfacet_double
	= & mesh_facets.getData<std::vector<Element> >("elements_to_subfacet_double",
	type_subfacet,
	gt_subfacet);

	facet_to_subfacet
	= & mesh_facets.getElementToSubelement(type_subfacet,
	gt_subfacet);
	}
	}

	if (subsubfacet_mode) {
	/// loop on every subsubfacet
	for (UInt ssf = 0; ssf < nb_subsubfacet; ++ssf) {
	Element & subsubfacet
	= (*subsubfacet_to_subfacet)(subfacet.element, ssf);

	if (subsubfacet == ElementNull) continue;

	if (gt_subsubfacet != subsubfacet.ghost_type) {
	gt_subsubfacet = subsubfacet.ghost_type;
	conn_subfacet = & mesh_facets.getConnectivity(type_subsubfacet,
	gt_subsubfacet);
	sf_to_double = & mesh_facets.getData<UInt>("facet_to_double",
	type_subsubfacet,
	gt_subsubfacet);

	sf_to_subfacet_double
	= & mesh_facets.getData<std::vector<Element> >("subfacets_to_subsubfacet_double",
	type_subsubfacet,
	gt_subsubfacet);

	f_to_subfacet_double
	= & mesh_facets.getData<std::vector<Element> >("facets_to_subfacet_double",
	type_subsubfacet,
	gt_subsubfacet);

	el_to_subfacet_double
	= & mesh_facets.getData<std::vector<Element> >("elements_to_subfacet_double",
	type_subsubfacet,
	gt_subsubfacet);

	facet_to_subfacet
	= & mesh_facets.getElementToSubelement(type_subsubfacet,
	gt_subsubfacet);
	}

	UInt global_ssf = subsubfacet.element;

	Vector<UInt> subsubfacet_connectivity(conn_subfacet->storage()
	+ global_ssf
	* nb_nodes_per_sf_el,
	nb_nodes_per_sf_el);

	/// check if subsubfacet is to be doubled
	if (findElementsAroundSubfacet<true>(mesh, mesh_facets,
	starting_element, current_facet,
	subsubfacet_connectivity,
	element_list,
	facet_list,
	subfacet_list) == false &&
	removeElementsInVector(*subfacet_list,
	(*facet_to_subfacet)(global_ssf)) == false) {

	sf_to_double->push_back(global_ssf);
	sf_to_subfacet_double->push_back(*subfacet_list);
	f_to_subfacet_double->push_back(facet_list);
	el_to_subfacet_double->push_back(element_list);
	}
	}
	}
	else {
	const UInt global_sf = subfacet.element;

	Vector<UInt> subfacet_connectivity(conn_subfacet->storage()
	+ global_sf
	* nb_nodes_per_sf_el,
	nb_nodes_per_sf_el);

	/// check if subfacet is to be doubled
	if (findElementsAroundSubfacet<false>(mesh, mesh_facets,
	starting_element, current_facet,
	subfacet_connectivity,
	element_list,
	facet_list) == false &&
	removeElementsInVector(facet_list,
	(*facet_to_subfacet)(global_sf)) == false) {

	sf_to_double->push_back(global_sf);
	f_to_subfacet_double->push_back(facet_list);
	el_to_subfacet_double->push_back(element_list);
	}
	}
	}
	}
	}

	if (subsubfacet_mode)
	delete subfacet_list;
	}
	}

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	#if defined(AKANTU_COHESIVE_ELEMENT)
	void MeshUtils::updateCohesiveData(Mesh & mesh,
	Mesh & mesh_facets,
	Array<Element> & new_elements) {
	AKANTU_DEBUG_IN();

	UInt spatial_dimension = mesh.getSpatialDimension();
	bool third_dimension = spatial_dimension == 3;

	for (ghost_type_t::iterator gt = ghost_type_t::begin();
	gt != ghost_type_t::end(); ++gt) {

	GhostType gt_facet = *gt;

	Mesh::type_iterator it = mesh_facets.firstType(spatial_dimension - 1, gt_facet);
	Mesh::type_iterator end = mesh_facets.lastType(spatial_dimension - 1, gt_facet);

	for(; it != end; ++it) {

	ElementType type_facet = *it;

	Array<UInt> & f_to_double = mesh_facets.getData<UInt>("facet_to_double",
	type_facet,
	gt_facet);

	UInt nb_facet_to_double = f_to_double.getSize();
	if (nb_facet_to_double == 0) continue;

	ElementType type_cohesive = FEEngine::getCohesiveElementType(type_facet);

	Array<Element> * facet_to_coh_element
	= mesh_facets.getSubelementToElementPointer(type_cohesive, gt_facet);

	Array<UInt> & conn_facet = mesh_facets.getConnectivity(type_facet, gt_facet);
	Array<UInt> * conn_cohesive = mesh.getConnectivityPointer(type_cohesive,
	gt_facet);
	UInt nb_nodes_per_facet = Mesh::getNbNodesPerElement(type_facet);

	Array< std::vector<Element> > & element_to_facet
	= mesh_facets.getElementToSubelement(type_facet, gt_facet);

	UInt old_nb_cohesive_elements = conn_cohesive->getSize();
	UInt new_nb_cohesive_elements = conn_cohesive->getSize() + nb_facet_to_double;

	UInt old_nb_facet = element_to_facet.getSize() - nb_facet_to_double;
	facet_to_coh_element->resize(new_nb_cohesive_elements);
	conn_cohesive->resize(new_nb_cohesive_elements);

	UInt new_elements_old_size = new_elements.getSize();
	new_elements.resize(new_elements_old_size + nb_facet_to_double);

	Element c_element(type_cohesive, 0, gt_facet, _ek_cohesive);
	Element f_element(type_facet, 0, gt_facet);

	UInt facets[2];

	for (UInt facet = 0; facet < nb_facet_to_double; ++facet) {

	/// (in 3D cohesive elements connectivity is inverted)
	facets[third_dimension] = f_to_double(facet);
	facets[!third_dimension] = old_nb_facet + facet;

	UInt cohesive_element = old_nb_cohesive_elements + facet;

	/// store doubled facets
	f_element.element = facets[0];
	(*facet_to_coh_element)(cohesive_element, 0) = f_element;
	f_element.element = facets[1];
	(*facet_to_coh_element)(cohesive_element, 1) = f_element;

	/// modify cohesive elements' connectivity
	for (UInt n = 0; n < nb_nodes_per_facet; ++n) {
	(*conn_cohesive)(cohesive_element, n) = conn_facet(facets[0], n);
	(*conn_cohesive)(cohesive_element, n + nb_nodes_per_facet)
	= conn_facet(facets[1], n);
	}

	/// update element_to_facet vectors
	c_element.element = cohesive_element;
	element_to_facet(facets[0])[1] = c_element;
	element_to_facet(facets[1])[1] = c_element;

	/// add cohesive element to the element event list
	new_elements(new_elements_old_size + facet) = c_element;
	}
	}
	}

	AKANTU_DEBUG_OUT();
	}
	#endif

	/* -------------------------------------------------------------------------- */
	void MeshUtils::doublePointFacet(Mesh & mesh,
	Mesh & mesh_facets,
	Array<UInt> & doubled_nodes) {
	AKANTU_DEBUG_IN();

	UInt spatial_dimension = mesh.getSpatialDimension();
	if (spatial_dimension != 1) return;

	Array<Real> & position = mesh.getNodes();

	for (ghost_type_t::iterator gt = ghost_type_t::begin();
	gt != ghost_type_t::end(); ++gt) {

	GhostType gt_facet = *gt;

	Mesh::type_iterator it = mesh_facets.firstType(spatial_dimension - 1, gt_facet);
	Mesh::type_iterator end = mesh_facets.lastType(spatial_dimension - 1, gt_facet);

	for(; it != end; ++it) {

	ElementType type_facet = *it;

	Array<UInt> & conn_facet = mesh_facets.getConnectivity(type_facet, gt_facet);
	Array< std::vector<Element> > & element_to_facet
	= mesh_facets.getElementToSubelement(type_facet, gt_facet);

	const Array<UInt> & f_to_double = mesh_facets.getData<UInt>("facet_to_double",
	type_facet,
	gt_facet);

	UInt nb_facet_to_double = f_to_double.getSize();

	UInt old_nb_facet = element_to_facet.getSize() - nb_facet_to_double;
	UInt new_nb_facet = element_to_facet.getSize();

	UInt old_nb_nodes = position.getSize();
	UInt new_nb_nodes = old_nb_nodes + nb_facet_to_double;

	position.resize(new_nb_nodes);
	conn_facet.resize(new_nb_facet);

	UInt old_nb_doubled_nodes = doubled_nodes.getSize();
	doubled_nodes.resize(old_nb_doubled_nodes + nb_facet_to_double);

	for (UInt facet = 0; facet < nb_facet_to_double; ++facet) {
	UInt old_facet = f_to_double(facet);
	UInt new_facet = old_nb_facet + facet;

	ElementType type = element_to_facet(new_facet)[0].type;
	UInt el = element_to_facet(new_facet)[0].element;
	GhostType gt = element_to_facet(new_facet)[0].ghost_type;

	UInt old_node = conn_facet(old_facet);
	UInt new_node = old_nb_nodes + facet;

	/// update position
	position(new_node) = position(old_node);

	conn_facet(new_facet) = new_node;
	Array<UInt> & conn_segment = mesh.getConnectivity(type, gt);
	UInt nb_nodes_per_segment = conn_segment.getNbComponent();

	/// update facet connectivity
	UInt i;
	for (i = 0; conn_segment(el, i) != old_node
	&& i <= nb_nodes_per_segment; ++i);
	conn_segment(el, i) = new_node;

	doubled_nodes(old_nb_doubled_nodes + facet, 0) = old_node;
	doubled_nodes(old_nb_doubled_nodes + facet, 1) = new_node;
	}
	}
	}

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	template <bool third_dim_segments>
	void MeshUtils::updateQuadraticSegments(Mesh & mesh,
	Mesh & mesh_facets,
	ElementType type_facet,
	GhostType gt_facet,
	Array<UInt> & doubled_nodes) {
	AKANTU_DEBUG_IN();

	if (type_facet != _segment_3) return;

	Array<UInt> & f_to_double = mesh_facets.getData<UInt>("facet_to_double",
	type_facet,
	gt_facet);
	UInt nb_facet_to_double = f_to_double.getSize();

	UInt old_nb_facet
	= mesh_facets.getNbElement(type_facet, gt_facet) - nb_facet_to_double;

	Array<UInt> & conn_facet = mesh_facets.getConnectivity(type_facet,
	gt_facet);

	Array< std::vector<Element> > & element_to_facet
	= mesh_facets.getElementToSubelement(type_facet, gt_facet);

	/// this ones matter only for segments in 3D
	Array< std::vector<Element> > * el_to_subfacet_double = NULL;
	Array< std::vector<Element> > * f_to_subfacet_double = NULL;

	if (third_dim_segments) {
	el_to_subfacet_double
	= & mesh_facets.getData<std::vector<Element> >("elements_to_subfacet_double",
	type_facet,
	gt_facet);

	f_to_subfacet_double
	= & mesh_facets.getData<std::vector<Element> >("facets_to_subfacet_double",
	type_facet,
	gt_facet);
	}

	Array<UInt> middle_nodes;
	Array<UInt> subfacets;

	for (UInt facet = 0; facet < nb_facet_to_double; ++facet) {
	UInt old_facet = f_to_double(facet);
	UInt node = conn_facet(old_facet, 2);
	if (!mesh.isPureGhostNode(node)) {
	middle_nodes.push_back(node);
	subfacets.push_back(facet);
	}
	}

	UInt old_nb_doubled_nodes = doubled_nodes.getSize();

	doubleNodes(mesh, middle_nodes, doubled_nodes);

	for (UInt n = old_nb_doubled_nodes; n < doubled_nodes.getSize(); ++n) {
	UInt old_node = doubled_nodes(n, 0);
	UInt new_node = doubled_nodes(n, 1);
	UInt sf = subfacets(n - old_nb_doubled_nodes);
	UInt new_facet = old_nb_facet + sf;

	conn_facet(new_facet, 2) = new_node;

	if (third_dim_segments) {
	updateElementalConnectivity(mesh_facets,
	old_node, new_node,
	element_to_facet(new_facet));

	updateElementalConnectivity(mesh,
	old_node, new_node,
	(*el_to_subfacet_double)(sf),
	&(*f_to_subfacet_double)(sf));
	}
	else {
	updateElementalConnectivity(mesh,
	old_node, new_node,
	element_to_facet(new_facet));
	}
	}

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void MeshUtils::updateSubfacetToFacet(Mesh & mesh_facets,
	ElementType type_subfacet,
	GhostType gt_subfacet,
	bool facet_mode) {
	AKANTU_DEBUG_IN();

	Array<UInt> & sf_to_double = mesh_facets.getData<UInt>("facet_to_double",
	type_subfacet,
	gt_subfacet);
	UInt nb_subfacet_to_double = sf_to_double.getSize();

	/// update subfacet_to_facet vector
	ElementType type_facet = _not_defined;
	GhostType gt_facet = _casper;
	Array<Element> * subfacet_to_facet = NULL;
	UInt nb_subfacet_per_facet = 0;
	UInt old_nb_subfacet
	= mesh_facets.getNbElement(type_subfacet, gt_subfacet) - nb_subfacet_to_double;

	Array<std::vector<Element> > * facet_list = NULL;
	if (facet_mode)
	facet_list = & mesh_facets.getData<std::vector<Element> >("facets_to_subfacet_double",
	type_subfacet,
	gt_subfacet);
	else
	facet_list = & mesh_facets.getData<std::vector<Element> >("subfacets_to_subsubfacet_double",
	type_subfacet,
	gt_subfacet);

	Element old_subfacet_el(type_subfacet, 0, gt_subfacet);
	Element new_subfacet_el(type_subfacet, 0, gt_subfacet);

	for (UInt sf = 0; sf < nb_subfacet_to_double; ++sf) {
	old_subfacet_el.element = sf_to_double(sf);
	new_subfacet_el.element = old_nb_subfacet + sf;

	for (UInt f = 0; f < (*facet_list)(sf).size(); ++f) {
	Element & facet = (*facet_list)(sf)[f];

	if (facet.type != type_facet \|\| facet.ghost_type != gt_facet) {
	type_facet = facet.type;
	gt_facet = facet.ghost_type;

	subfacet_to_facet = & mesh_facets.getSubelementToElement(type_facet,
	gt_facet);
	nb_subfacet_per_facet = subfacet_to_facet->getNbComponent();
	}

	Element * sf_update
	= std::find(subfacet_to_facet->storage()
	+ facet.element * nb_subfacet_per_facet,
	subfacet_to_facet->storage()
	+ facet.element * nb_subfacet_per_facet + nb_subfacet_per_facet,
	old_subfacet_el);

	AKANTU_DEBUG_ASSERT(subfacet_to_facet->storage()
	+ facet.element * nb_subfacet_per_facet !=
	subfacet_to_facet->storage()
	+ facet.element * nb_subfacet_per_facet + nb_subfacet_per_facet,
	"Subfacet not found");

	*sf_update = new_subfacet_el;
	}
	}

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void MeshUtils::updateFacetToSubfacet(Mesh & mesh_facets,
	ElementType type_subfacet,
	GhostType gt_subfacet,
	bool facet_mode) {
	AKANTU_DEBUG_IN();

	Array<UInt> & sf_to_double = mesh_facets.getData<UInt>("facet_to_double",
	type_subfacet,
	gt_subfacet);
	UInt nb_subfacet_to_double = sf_to_double.getSize();

	Array< std::vector<Element> > & facet_to_subfacet
	= mesh_facets.getElementToSubelement(type_subfacet, gt_subfacet);

	Array< std::vector<Element> > * facet_to_subfacet_double = NULL;

	if (facet_mode) {
	facet_to_subfacet_double
	= & mesh_facets.getData<std::vector<Element> >("facets_to_subfacet_double",
	type_subfacet,
	gt_subfacet);
	}
	else {
	facet_to_subfacet_double
	= & mesh_facets.getData<std::vector<Element> >("subfacets_to_subsubfacet_double",
	type_subfacet,
	gt_subfacet);
	}

	for (UInt sf = 0; sf < nb_subfacet_to_double; ++sf)
	facet_to_subfacet.push_back((*facet_to_subfacet_double)(sf));

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	template <UInt spatial_dimension>
	void MeshUtils::doubleSubfacet(Mesh & mesh,
	Mesh & mesh_facets,
	Array<UInt> & doubled_nodes) {
	AKANTU_DEBUG_IN();

	if (spatial_dimension == 1) return;

	for (ghost_type_t::iterator gt = ghost_type_t::begin();
	gt != ghost_type_t::end(); ++gt) {

	GhostType gt_subfacet = *gt;

	Mesh::type_iterator it = mesh_facets.firstType(0, gt_subfacet);
	Mesh::type_iterator end = mesh_facets.lastType(0, gt_subfacet);

	for(; it != end; ++it) {

	ElementType type_subfacet = *it;

	Array<UInt> & sf_to_double = mesh_facets.getData<UInt>("facet_to_double",
	type_subfacet,
	gt_subfacet);
	UInt nb_subfacet_to_double = sf_to_double.getSize();

	if (nb_subfacet_to_double == 0) continue;

	AKANTU_DEBUG_ASSERT(type_subfacet == _point_1,
	"Only _point_1 subfacet doubling is supported at the moment");

	Array<UInt> & conn_subfacet = mesh_facets.getConnectivity(type_subfacet,
	gt_subfacet);

	UInt old_nb_subfacet = conn_subfacet.getSize();
	UInt new_nb_subfacet = old_nb_subfacet + nb_subfacet_to_double;

	conn_subfacet.resize(new_nb_subfacet);

	Array<UInt> nodes_to_double;
	UInt old_nb_doubled_nodes = doubled_nodes.getSize();

	/// double nodes
	for (UInt sf = 0; sf < nb_subfacet_to_double; ++sf) {
	UInt old_subfacet = sf_to_double(sf);
	nodes_to_double.push_back(conn_subfacet(old_subfacet));
	}

	doubleNodes(mesh, nodes_to_double, doubled_nodes);

	/// add new nodes in connectivity
	for (UInt sf = 0; sf < nb_subfacet_to_double; ++sf) {
	UInt new_subfacet = old_nb_subfacet + sf;
	UInt new_node = doubled_nodes(old_nb_doubled_nodes + sf, 1);

	conn_subfacet(new_subfacet) = new_node;
	}

	/// update facet and element connectivity
	Array<std::vector<Element> > & f_to_subfacet_double =
	mesh_facets.getData<std::vector<Element> >("facets_to_subfacet_double",
	type_subfacet,
	gt_subfacet);

	Array<std::vector<Element> > & el_to_subfacet_double =
	mesh_facets.getData<std::vector<Element> >("elements_to_subfacet_double",
	type_subfacet,
	gt_subfacet);

	Array<std::vector<Element> > * sf_to_subfacet_double = NULL;

	if (spatial_dimension == 3)
	sf_to_subfacet_double
	= & mesh_facets.getData<std::vector<Element> >("subfacets_to_subsubfacet_double",
	type_subfacet,
	gt_subfacet);

	for (UInt sf = 0; sf < nb_subfacet_to_double; ++sf) {
	UInt old_node = doubled_nodes(old_nb_doubled_nodes + sf, 0);
	UInt new_node = doubled_nodes(old_nb_doubled_nodes + sf, 1);

	updateElementalConnectivity(mesh,
	old_node, new_node,
	el_to_subfacet_double(sf),
	&f_to_subfacet_double(sf));

	updateElementalConnectivity(mesh_facets,
	old_node, new_node,
	f_to_subfacet_double(sf));

	if (spatial_dimension == 3)
	updateElementalConnectivity(mesh_facets,
	old_node, new_node,
	(*sf_to_subfacet_double)(sf));
	}

	if (spatial_dimension == 2) {
	updateSubfacetToFacet(mesh_facets, type_subfacet, gt_subfacet, true);
	updateFacetToSubfacet(mesh_facets, type_subfacet, gt_subfacet, true);
	}
	else if (spatial_dimension == 3) {
	updateSubfacetToFacet(mesh_facets, type_subfacet, gt_subfacet, false);
	updateFacetToSubfacet(mesh_facets, type_subfacet, gt_subfacet, false);
	}
	}
	}

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void MeshUtils::flipFacets(Mesh & mesh_facets,
	const ElementTypeMapArray<UInt> & global_connectivity,
	GhostType gt_facet) {
	AKANTU_DEBUG_IN();

	UInt spatial_dimension = mesh_facets.getSpatialDimension();

	/// get global connectivity for local mesh
	ElementTypeMapArray<UInt> global_connectivity_tmp;

	mesh_facets.initElementTypeMapArray(global_connectivity_tmp, 1,
	spatial_dimension - 1, gt_facet,
	true, _ek_regular, true);

	mesh_facets.getGlobalConnectivity(global_connectivity_tmp,
	spatial_dimension - 1, gt_facet);


	Mesh::type_iterator it = mesh_facets.firstType(spatial_dimension - 1, gt_facet);
	Mesh::type_iterator end = mesh_facets.lastType(spatial_dimension - 1, gt_facet);

	/// loop on every facet
	for(; it != end; ++it) {
	ElementType type_facet = *it;

	Array<UInt> & connectivity = mesh_facets.getConnectivity(type_facet, gt_facet);
	const Array<UInt> & g_connectivity = global_connectivity(type_facet, gt_facet);

	Array<std::vector<Element> > & el_to_f =
	mesh_facets.getElementToSubelement(type_facet, gt_facet);
	Array<Element> & subfacet_to_facet =
	mesh_facets.getSubelementToElement(type_facet, gt_facet);

	UInt nb_subfacet_per_facet = subfacet_to_facet.getNbComponent();
	UInt nb_nodes_per_facet = connectivity.getNbComponent();
	UInt nb_facet = connectivity.getSize();

	UInt nb_nodes_per_P1_facet
	= Mesh::getNbNodesPerElement(Mesh::getP1ElementType(type_facet));

	Array<UInt> & global_conn_tmp = global_connectivity_tmp(type_facet, gt_facet);

	Array<UInt>::iterator<Vector<UInt> > conn_it =
	connectivity.begin(nb_nodes_per_facet);
	Array<UInt>::iterator<Vector<UInt> > gconn_tmp_it =
	global_conn_tmp.begin(nb_nodes_per_facet);
	Array<UInt>::const_iterator<Vector<UInt> > conn_glob_it =
	g_connectivity.begin(nb_nodes_per_facet);
	Array<Element>::iterator<Vector<Element> > subf_to_f =
	subfacet_to_facet.begin(nb_subfacet_per_facet);

	UInt * conn_tmp_pointer = new UInt[nb_nodes_per_facet];
	Vector<UInt> conn_tmp(conn_tmp_pointer, nb_nodes_per_facet);

	Element el_tmp;
	Element * subf_tmp_pointer = new Element[nb_subfacet_per_facet];
	Vector<Element> subf_tmp(subf_tmp_pointer, nb_subfacet_per_facet);

	for (UInt f = 0; f < nb_facet; ++f, ++conn_it, ++gconn_tmp_it,
	++subf_to_f, ++conn_glob_it) {

	Vector<UInt> & gconn_tmp = *gconn_tmp_it;
	const Vector<UInt> & conn_glob = *conn_glob_it;
	Vector<UInt> & conn_local = *conn_it;

	/// skip facet if connectivities are the same
	if (gconn_tmp == conn_glob) continue;

	/// re-arrange connectivity
	conn_tmp = conn_local;

	UInt * begin = conn_glob.storage();
	UInt * end = conn_glob.storage() + nb_nodes_per_facet;

	for (UInt n = 0; n < nb_nodes_per_facet; ++n) {

	UInt * new_node = std::find(begin, end, gconn_tmp(n));
	AKANTU_DEBUG_ASSERT(new_node != end, "Node not found");

	UInt new_position = new_node - begin;

	conn_local(new_position) = conn_tmp(n);
	}

	/// if 3D, check if facets are just rotated
	if (spatial_dimension == 3) {
	/// find first node
	UInt * new_node = std::find(begin, end, gconn_tmp(0));
	AKANTU_DEBUG_ASSERT(new_node != end, "Node not found");

	UInt new_position = new_node - begin;
	UInt n = 1;

	/// count how many nodes in the received connectivity follow
	/// the same order of those in the local connectivity
	for (; n < nb_nodes_per_P1_facet &&
	gconn_tmp(n) == conn_glob((new_position + n) % nb_nodes_per_P1_facet);
	++n);

	/// skip the facet inversion if facet is just rotated
	if (n == nb_nodes_per_P1_facet) continue;
	}

	/// update data to invert facet
	el_tmp = el_to_f(f)[0];
	el_to_f(f)[0] = el_to_f(f)[1];
	el_to_f(f)[1] = el_tmp;

	subf_tmp = (*subf_to_f);
	(*subf_to_f)(0) = subf_tmp(1);
	(*subf_to_f)(1) = subf_tmp(0);
	}

	delete [] subf_tmp_pointer;
	delete [] conn_tmp_pointer;
	}

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void MeshUtils::fillElementToSubElementsData(Mesh & mesh) {
	AKANTU_DEBUG_IN();

	if(mesh.getNbElement(mesh.getSpatialDimension() - 1) == 0) {
	AKANTU_DEBUG_INFO("There are not facets, add them in the mesh file or call the buildFacet method.");
	return;
	}

	UInt spatial_dimension = mesh.getSpatialDimension();
	ElementTypeMapArray<Real> barycenters("barycenter_tmp", mesh.getID());
	mesh.initElementTypeMapArray(barycenters,
	spatial_dimension,
	_all_dimensions);

	for (ghost_type_t::iterator gt = ghost_type_t::begin();
	gt != ghost_type_t::end();
	++gt) {
	Mesh::type_iterator it = mesh.firstType(_all_dimensions, *gt);
	Mesh::type_iterator end = mesh.lastType(_all_dimensions, *gt);
	for(; it != end; ++it) {
	UInt nb_element = mesh.getNbElement(it, gt);
	Array<Real> & barycenters_arr = barycenters(it, gt);
	barycenters_arr.resize(nb_element);
	Array<Real>::vector_iterator bary = barycenters_arr.begin(spatial_dimension);
	Array<Real>::vector_iterator bary_end = barycenters_arr.end(spatial_dimension);

	for (UInt el = 0; bary != bary_end; ++bary, ++el) {
	mesh.getBarycenter(el, it, bary->storage(), gt);
	}
	}
	}

	for(Int sp(spatial_dimension); sp >= 1; --sp) {
	if(mesh.getNbElement(sp) == 0) continue;

	for (ghost_type_t::iterator git = ghost_type_t::begin(); git != ghost_type_t::end(); ++git) {
	Mesh::type_iterator tit = mesh.firstType(sp, *git);
	Mesh::type_iterator tend = mesh.lastType(sp, *git);
	for (;tit != tend; ++tit) {
	mesh.getSubelementToElementPointer(tit, git)->resize(mesh.getNbElement(tit, git));
	mesh.getSubelementToElement(tit, git).clear();
	}

	tit = mesh.firstType(sp - 1, *git);
	tend = mesh.lastType(sp - 1, *git);
	for (;tit != tend; ++tit) {
	mesh.getElementToSubelementPointer(tit, git)->resize(mesh.getNbElement(tit, git));
	mesh.getElementToSubelement(tit, git).clear();
	}
	}


	CSR<Element> nodes_to_elements;
	buildNode2Elements(mesh, nodes_to_elements, sp);

	Element facet_element;

	for (ghost_type_t::iterator git = ghost_type_t::begin(); git != ghost_type_t::end(); ++git) {
	Mesh::type_iterator tit = mesh.firstType(sp - 1, *git);
	Mesh::type_iterator tend = mesh.lastType(sp - 1, *git);

	facet_element.ghost_type = *git;
	for (;tit != tend; ++tit) {
	facet_element.type = *tit;

	Array< std::vector<Element> > & element_to_subelement = mesh.getElementToSubelement(tit, git);

	const Array<UInt> & connectivity = mesh.getConnectivity(tit, git);

	Array<UInt>::const_iterator< Vector<UInt> > fit = connectivity.begin(mesh.getNbNodesPerElement(*tit));
	Array<UInt>::const_iterator< Vector<UInt> > fend = connectivity.end(mesh.getNbNodesPerElement(*tit));

	UInt fid = 0;
	for (;fit != fend; ++fit, ++fid) {
	const Vector<UInt> & facet = *fit;
	facet_element.element = fid;
	std::map<Element, UInt> element_seen_counter;
	UInt nb_nodes_per_facet = mesh.getNbNodesPerElement(Mesh::getP1ElementType(*tit));
	for (UInt n(0); n < nb_nodes_per_facet; ++n) {
	CSR<Element>::iterator eit = nodes_to_elements.begin(facet(n));
	CSR<Element>::iterator eend = nodes_to_elements.end(facet(n));
	for(;eit != eend; ++eit) {
	Element & elem = *eit;
	std::map<Element, UInt>::iterator cit = element_seen_counter.find(elem);
	if(cit != element_seen_counter.end()) {
	cit->second++;
	} else {
	element_seen_counter[elem] = 1;
	}
	}
	}

	std::vector<Element> connected_elements;
	std::map<Element, UInt>::iterator cit = element_seen_counter.begin();
	std::map<Element, UInt>::iterator cend = element_seen_counter.end();
	for(;cit != cend; ++cit) {
	if(cit->second == nb_nodes_per_facet) connected_elements.push_back(cit->first);
	}

	std::vector<Element>::iterator ceit = connected_elements.begin();
	std::vector<Element>::iterator ceend = connected_elements.end();
	for(;ceit != ceend; ++ceit)
	element_to_subelement(fid).push_back(*ceit);

	for (UInt ce = 0; ce < connected_elements.size(); ++ce) {
	Element & elem = connected_elements[ce];
	Array<Element> & subelement_to_element =
	*(mesh.getSubelementToElementPointer(elem.type,
	elem.ghost_type));

	UInt f(0);
	for(; f < mesh.getNbFacetsPerElement(elem.type) && subelement_to_element(elem.element, f) != ElementNull; ++f);
	AKANTU_DEBUG_ASSERT(f < mesh.getNbFacetsPerElement(elem.type), "The element " << elem << " seems to have too many facets!! (" << f << " < " << mesh.getNbFacetsPerElement(elem.type) << ")");
	subelement_to_element(elem.element, f) = facet_element;
	}
	}
	}
	}
	}

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	template <bool third_dim_points>
	bool MeshUtils::findElementsAroundSubfacet(const Mesh & mesh,
	const Mesh & mesh_facets,
	const Element & starting_element,
	const Element & end_facet,
	const Vector<UInt> & subfacet_connectivity,
	std::vector<Element> & elem_list,
	std::vector<Element> & facet_list,
	std::vector<Element> * subfacet_list) {
	AKANTU_DEBUG_IN();

	/// preallocated stuff before starting
	bool facet_matched = false;

	elem_list.resize(0);
	facet_list.resize(0);

	if (third_dim_points)
	subfacet_list->resize(0);

	elem_list.push_back(starting_element);

	const Array<UInt> * facet_connectivity = NULL;
	const Array<UInt> * sf_connectivity = NULL;
	const Array<Element> * facet_to_element = NULL;
	const Array<Element> * subfacet_to_facet = NULL;

	ElementType current_type = _not_defined;
	GhostType current_ghost_type = _casper;

	ElementType current_facet_type = _not_defined;
	GhostType current_facet_ghost_type = _casper;

	ElementType current_subfacet_type = _not_defined;
	GhostType current_subfacet_ghost_type = _casper;

	const Array< std::vector<Element> > * element_to_facet = NULL;

	const Element * opposing_el = NULL;

	Array<Element> elements_to_check;
	elements_to_check.resize(0);
	elements_to_check.push_back(starting_element);

	/// keep going until there are elements to check
	while (elements_to_check.getSize() != 0) {

	/// loop over each element to check
	for (UInt el = 0; el < elements_to_check.getSize(); ++el) {

	Element & current_el = elements_to_check(el);

	if (current_el.type != current_type \|\|
	current_el.ghost_type != current_ghost_type) {

	current_type = current_el.type;
	current_ghost_type = current_el.ghost_type;

	facet_to_element = & mesh_facets.getSubelementToElement(current_type,
	current_ghost_type);
	}

	/// loop over each facet of the element
	for (UInt f = 0; f < facet_to_element->getNbComponent(); ++f) {

	const Element & current_facet = (*facet_to_element)(current_el.element, f);

	if (current_facet == ElementNull) continue;

	if (current_facet_type != current_facet.type \|\|
	current_facet_ghost_type != current_facet.ghost_type) {

	current_facet_type = current_facet.type;
	current_facet_ghost_type = current_facet.ghost_type;

	element_to_facet =
	& mesh_facets.getElementToSubelement(current_facet_type,
	current_facet_ghost_type);
	facet_connectivity = & mesh_facets.getConnectivity(current_facet_type,
	current_facet_ghost_type);

	if (third_dim_points)
	subfacet_to_facet =
	& mesh_facets.getSubelementToElement(current_facet_type,
	current_facet_ghost_type);
	}

	/// check if end facet is reached
	if (current_facet == end_facet)
	facet_matched = true;

	/// add this facet if not already passed
	if (std::find(facet_list.begin(),
	facet_list.end(),
	current_facet) == facet_list.end() &&
	hasElement(*facet_connectivity, current_facet, subfacet_connectivity)) {
	facet_list.push_back(current_facet);

	if (third_dim_points) {
	/// check subfacets
	for (UInt sf = 0; sf < subfacet_to_facet->getNbComponent(); ++sf) {
	const Element & current_subfacet
	= (*subfacet_to_facet)(current_facet.element, sf);

	if (current_subfacet == ElementNull) continue;

	if (current_subfacet_type != current_subfacet.type \|\|
	current_subfacet_ghost_type != current_subfacet.ghost_type) {
	current_subfacet_type = current_subfacet.type;
	current_subfacet_ghost_type = current_subfacet.ghost_type;

	sf_connectivity
	= & mesh_facets.getConnectivity(current_subfacet_type,
	current_subfacet_ghost_type);
	}

	if (std::find(subfacet_list->begin(),
	subfacet_list->end(),
	current_subfacet) == subfacet_list->end() &&
	hasElement(*sf_connectivity, current_subfacet, subfacet_connectivity))
	subfacet_list->push_back(current_subfacet);
	}
	}
	}
	else
	continue;

	/// consider opposing element
	if ( (*element_to_facet)(current_facet.element)[0] == current_el)
	opposing_el = & (*element_to_facet)(current_facet.element)[1];
	else
	opposing_el = & (*element_to_facet)(current_facet.element)[0];

	/// skip null elements since they are on a boundary
	if (*opposing_el == ElementNull) continue;

	/// skip this element if already added
	if ( std::find(elem_list.begin(),
	elem_list.end(),
	*opposing_el) != elem_list.end() ) continue;

	/// only regular elements have to be checked
	if (opposing_el->kind == _ek_regular)
	elements_to_check.push_back(*opposing_el);

	elem_list.push_back(*opposing_el);

	#ifndef AKANTU_NDEBUG
	const Array<UInt> & conn_elem = mesh.getConnectivity(opposing_el->type,
	opposing_el->ghost_type);

	AKANTU_DEBUG_ASSERT(hasElement(conn_elem, *opposing_el, subfacet_connectivity),
	"Subfacet doesn't belong to this element");
	#endif
	}

	/// erased checked element from the list
	elements_to_check.erase(el);
	}
	}

	AKANTU_DEBUG_OUT();
	return facet_matched;
	}

	__END_AKANTU__

	// LocalWords: ElementType

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