Mesh.cc

#include <algorithm>
#include <set>
#include <map>

#include "time.h"

#include "AdaptStationary.h"
#include "AdaptInstationary.h"
#include "FiniteElemSpace.h"
#include "ElementData.h"
#include "ElementDofIterator.h"
#include "MacroElement.h"
#include "MacroReader.h"
#include "Mesh.h"
#include "Traverse.h"
#include "Parameters.h"
#include "FixVec.h"
#include "DOFVector.h"
#include "CoarseningManager.h"
#include "DOFIterator.h"
#include "VertexVector.h"
#include "MacroWriter.h"
#include "PeriodicMap.h"
#include "Projection.h"
#include "ElInfoStack.h"
#include "Serializer.h"

namespace AMDiS {

#define TIME_USED(f,s) ((double)((s)-(f))/(double)CLOCKS_PER_SEC)

  //**************************************************************************
  //  flags, which information should be present in the elInfo structure     
  //**************************************************************************

  const Flag Mesh::FILL_NOTHING    = 0X00L;
  const Flag Mesh::FILL_COORDS     = 0X01L;
  const Flag Mesh::FILL_BOUND      = 0X02L;
  const Flag Mesh::FILL_NEIGH      = 0X04L;
  const Flag Mesh::FILL_OPP_COORDS = 0X08L;
  const Flag Mesh::FILL_ORIENTATION= 0X10L;
  const Flag Mesh::FILL_DET        = 0X20L;
  const Flag Mesh::FILL_GRD_LAMBDA = 0X40L;
  const Flag Mesh::FILL_ADD_ALL    = 0X80L;


  const Flag Mesh::FILL_ANY_1D = (0X01L|0X02L|0X04L|0X08L|0x20L|0X40L|0X80L);
  const Flag Mesh::FILL_ANY_2D = (0X01L|0X02L|0X04L|0X08L|0x20L|0X40L|0X80L);
  const Flag Mesh::FILL_ANY_3D = (0X01L|0X02L|0X04L|0X08L|0X10L|0x20L|0X40L|0X80L);

  //**************************************************************************
  //  flags for Mesh traversal                                                
  //**************************************************************************

  const Flag Mesh::CALL_EVERY_EL_PREORDER  = 0X0100L;
  const Flag Mesh::CALL_EVERY_EL_INORDER   = 0X0200L;
  const Flag Mesh::CALL_EVERY_EL_POSTORDER = 0X0400L;
  const Flag Mesh::CALL_LEAF_EL            = 0X0800L;
  const Flag Mesh::CALL_LEAF_EL_LEVEL      = 0X1000L;
  const Flag Mesh::CALL_EL_LEVEL           = 0X2000L;
  const Flag Mesh::CALL_MG_LEVEL           = 0X4000L ; // used in mg methods 


  // const Flag Mesh::USE_PARAMETRIC          = 0X8000L ; // used in mg methods 

  std::vector<DegreeOfFreedom> Mesh::dof_used;
  const int Mesh::MAX_DOF = 100;
  std::map<std::pair<DegreeOfFreedom, int>, DegreeOfFreedom*> Mesh::serializedDOFs;

  struct delmem { 
    DegreeOfFreedom* ptr;
    int len;
  };


  Mesh::Mesh(std::string aName, int dimension) 
    : name(aName), 
      dim(dimension), 
      nVertices(0),
      nEdges(0),
      nLeaves(0), 
      nElements(0),
      parametric(NULL), 
      preserveCoarseDOFs(false),
      nDOFEl(0),
      nDOF(dimension, DEFAULT_VALUE, 0),
      nNodeEl(0),
      node(dimension, DEFAULT_VALUE, 0),
      elementPrototype(NULL),
      elementDataPrototype(NULL),
      elementIndex(-1),
      initialized(false),
      macroFileInfo(NULL),
      changeIndex(0),
      final_lambda(dimension, DEFAULT_VALUE, 0.0)
  {

    FUNCNAME("Mesh::Mesh()");

    // set default element prototype
    switch(dim) {
    case 1:
      elementPrototype = new Line(this);
      break;
    case 2:
      elementPrototype = new Triangle(this);
      break;
    case 3:
      elementPrototype = new Tetrahedron(this);
      break;
    default:
      ERROR_EXIT("invalid dimension\n");
    }

    elementPrototype->setIndex(-1);

    elementIndex = 0;
  }

  Mesh::~Mesh()
  {
    Element::deletedDOFs.clear();

    for (std::deque<MacroElement*>::const_iterator it = macroElements.begin();
	 it != macroElements.end(); ++it) {
      (*it)->getElement()->deleteElementDOFs();
      delete *it;
    }    

    Element::deletedDOFs.clear();

    if (macroFileInfo != NULL)
      delete macroFileInfo;    
    if (elementPrototype)
      delete elementPrototype;    
    if (elementDataPrototype)
      delete elementDataPrototype;    
    
    for (int i = 0; i < static_cast<int>(admin.size()); i++)
      delete admin[i];    
  }

  Mesh& Mesh::operator=(const Mesh& m)
  {
    FUNCNAME("Mesh::operator=()");

    if (this == &m)
      return *this;

    TEST_EXIT(dim == m.dim)("operator= works only on meshes with equal dim!\n");

    name = m.name;
    nVertices = m.nVertices;
    nEdges = m.nEdges;
    nLeaves = m.nLeaves;
    nElements = m.nElements;
    nFaces = m.nFaces;
    maxEdgeNeigh = m.maxEdgeNeigh;
    diam = m.diam;
    parametric = NULL;

    preserveCoarseDOFs = m.preserveCoarseDOFs;
    nDOFEl = m.nDOFEl;
    nDOF = m.nDOF;
    nNodeEl = m.nNodeEl;
    node = m.node;
    newDOF = m.newDOF;
    elementIndex = m.elementIndex;
    initialized = m.initialized;
    final_lambda = m.final_lambda;
    
    /* ====================== Create new DOFAdmins ================== */
    admin.resize(m.admin.size());
    for (int i = 0; i < static_cast<int>(admin.size()); i++) {
      admin[i] = new DOFAdmin(this);
      *(admin[i]) = *(m.admin[i]);
      admin[i]->setMesh(this);
    }


    /* ====================== Copy macro elements =================== */
  
    // mapIndex[i] is the index of the MacroElement element in the vector
    // macroElements, for which holds: element->getIndex() = i    
    std::map<int, int> mapIndex;

    // We use this map for coping the DOFs of the Elements within the
    // MacroElements objects.
    Mesh::serializedDOFs.clear();

    int insertCounter = 0;

    macroElements.clear();

    // Go through all MacroElements of mesh m, and create for every a new
    // MacroElement in this mesh.
    for (std::deque<MacroElement*>::const_iterator it = m.macroElements.begin();
	 it != m.macroElements.end(); ++it, insertCounter++) {

      // Create new MacroElement.
      MacroElement *el = new MacroElement(dim);

      // Use copy operator to copy all the data to the new MacroElement.
      *el = **it;

      // Make a copy of the Element data, together with all DOFs
      el->setElement((*it)->getElement()->cloneWithDOFs());

      // Insert the new MacroElement in the vector of all MacroElements.
      macroElements.push_back(el);

      // Update the index map.
      mapIndex.insert(std::pair<int, int>(el->getIndex(), insertCounter));
    }

    // Now we have to go through all the new MacroElements, and update the neighbour
    // connections.
    insertCounter = 0;
    for (std::deque<MacroElement*>::const_iterator it = m.macroElements.begin();
	 it != m.macroElements.end();
	 ++it, insertCounter++) {
      // Go through all neighbours.
      for (int i = 0; i < dim; i++) {
	// 1. Get index of the old MacroElement for its i-th neighbour.
	// 2. Because the index in the new MacroElement is the same, search
	//    for the vector index the corresponding element is stored in.
	// 3. Get this element from macroElements, and set it as the i-th
	//    neighbour for the current element.
	macroElements[insertCounter]->
	  setNeighbour(i, macroElements[mapIndex[(*it)->getNeighbour(i)->getIndex()]]);
      }
    }

    // Cleanup
    Mesh::serializedDOFs.clear();

    /* ================== Things will be done when required ============ */
      
    TEST_EXIT(elementDataPrototype == NULL)("TODO\n");
    TEST_EXIT(m.parametric == NULL)("TODO\n");
    TEST_EXIT(periodicAssociations.size() == 0)("TODO\n");

    return *this;
  }

  void Mesh::updateNumberOfLeaves()
  {
    nLeaves = 0;

    TraverseStack stack;
    ElInfo *elInfo = stack.traverseFirst(this, -1, Mesh::CALL_LEAF_EL);
    while (elInfo) {
      nLeaves++;
      elInfo = stack.traverseNext(elInfo);
    }
  }

  void Mesh::addMacroElement(MacroElement* me) 
  {
    macroElements.push_back(me); 
    me->setIndex(macroElements.size());
  }

  void Mesh::removeMacroElements(std::set<MacroElement*>& macros,
				 const FiniteElemSpace *feSpace) 
  {
    FUNCNAME("Mesh::removeMacroElement()");

    typedef std::map<const DegreeOfFreedom*, std::set<MacroElement*> > DofElMap;
    typedef std::map<const DegreeOfFreedom*, GeoIndex> DofPosMap;

    TEST_EXIT(admin.size() == 1)("Not yet implemented for multiple admins!\n");
    TEST_EXIT(admin[0])("There is something wrong!\n");

    ElementDofIterator elDofIter(feSpace);

    // Map that stores for each dof pointer (which may have a list of dofs)
    // all macro element indices that own this dof.
    DofElMap dofsOwner;
    DofPosMap dofsPosIndex;


    // === Determine to all dofs the macro elements where the dof is part of. ===

    for (std::deque<MacroElement*>::iterator macroIt = macroElements.begin();
	 macroIt != macroElements.end(); ++macroIt) {
      elDofIter.reset((*macroIt)->getElement());
      do {
	dofsOwner[elDofIter.getDofPtr()].insert(*macroIt);
	dofsPosIndex[elDofIter.getDofPtr()] = elDofIter.getPosIndex();
      } while (elDofIter.nextStrict());
    }

    // === Remove macro elements from mesh macro element list. ===

    // Removing arbitrary elements from an std::deque is very slow. Therefore, we
    // create a new deque with all macro elements that should not be deleted. The
    // macro element deque is than replaced by the new created one.

    std::deque<MacroElement*> newMacroElements;
    for (std::deque<MacroElement*>::iterator elIter = macroElements.begin();
	 elIter != macroElements.end(); ++elIter) {
      // If the current mesh macro element should not be deleted, i.e., it is not a
      // member of the list of macro elements to be deleted, is is inserted to the new
      // macro element list.
      if (macros.find(*elIter) == macros.end())
	newMacroElements.push_back(*elIter);      
    }
    // And replace the macro element list with the new one.
    macroElements.clear();
    macroElements = newMacroElements;


    // === For all macro elements to be deleted, delete them also to be neighbours ===
    // === of some other macro elements.                                           ===
    
    for (std::set<MacroElement*>::iterator macroIt = macros.begin();
	 macroIt != macros.end(); ++macroIt) {

      // Go through all neighbours of the macro element and remove this macro element
      // to be neighbour of some other macro element.
      for (int i = 0; i <= dim; i++) {
	if ((*macroIt)->getNeighbour(i)) {
	  for (int j = 0; j <= dim; j++)
	    if ((*macroIt)->getNeighbour(i)->getNeighbour(j) == *macroIt)
	      (*macroIt)->getNeighbour(i)->setNeighbour(j, NULL);
	} else {
	  // There is no neighbour at this edge, so we have to decrease the number
	  // of edges in the mesh.
	  nEdges--;
	}
      }

      // Decrease also the number of elements of the mesh.
      nLeaves--;
      nElements--;
    }     


    // === Check now all the dofs, that have no owner anymore and therefore have ===
    // === to be removed.                                                        ===

    int nRemainDofs = 0;
    for (DofElMap::iterator dofsIt = dofsOwner.begin(); 
	 dofsIt != dofsOwner.end(); ++dofsIt) {
      
      bool deleteDof = true;

      for (std::set<MacroElement*>::iterator elIter = dofsIt->second.begin();
	   elIter != dofsIt->second.end(); ++elIter) {
	std::set<MacroElement*>::iterator mIt = macros.find(*elIter);
	if (mIt == macros.end()) {
	  deleteDof = false;
	  break;
	}
      }

      if (deleteDof)
	freeDOF(const_cast<DegreeOfFreedom*>(dofsIt->first), 
		dofsPosIndex[dofsIt->first]);
      else
	nRemainDofs++;
    }


    // === Finally, remove the macro elements from memory. ===

    for (std::set<MacroElement*>::iterator macroIt = macros.begin();
	 macroIt != macros.end(); ++macroIt)
      delete *macroIt;

    nVertices = nRemainDofs;
  }

  void Mesh::addDOFAdmin(DOFAdmin *localAdmin)
  {    
    FUNCNAME("Mesh::addDOFAdmin()");

    localAdmin->setMesh(this);

    std::vector<DOFAdmin*>::iterator dai = 
      std::find(admin.begin(), admin.end(), localAdmin);

    TEST_EXIT(dai == admin.end())
      ("admin %s is already associated to mesh %s\n",
       localAdmin->getName().c_str(), this->getName().c_str());

    // if this will be required, see the untested code in revision < 224
    //    TEST_EXIT(!initialized)("Adding DOFAdmins to initilized meshes does not work yet!\n");

    admin.push_back(localAdmin);

    nDOFEl = 0;

    localAdmin->setNumberOfPreDOFs(VERTEX,nDOF[VERTEX]);
    nDOF[VERTEX] += localAdmin->getNumberOfDOFs(VERTEX);
    nDOFEl += getGeo(VERTEX) * nDOF[VERTEX];

    if (dim > 1) {
      localAdmin->setNumberOfPreDOFs(EDGE,nDOF[EDGE]);
      nDOF[EDGE] += localAdmin->getNumberOfDOFs(EDGE);
      nDOFEl += getGeo(EDGE) * nDOF[EDGE];
    }

    localAdmin->setNumberOfPreDOFs(CENTER,nDOF[CENTER]);
    nDOF[CENTER]  += localAdmin->getNumberOfDOFs(CENTER);
    nDOFEl += nDOF[CENTER];

    TEST_EXIT_DBG(nDOF[VERTEX] > 0)("no vertex dofs\n");

    node[VERTEX] = 0;
    nNodeEl = getGeo(VERTEX);

    if (dim > 1) {
      node[EDGE] = nNodeEl;
      if (nDOF[EDGE] > 0) 
	nNodeEl += getGeo(EDGE);
    }

    if (dim == 3) {
      localAdmin->setNumberOfPreDOFs(FACE,nDOF[FACE]);
      nDOF[FACE] += localAdmin->getNumberOfDOFs(FACE);
      nDOFEl += getGeo(FACE) * nDOF[FACE];
      node[FACE] = nNodeEl;
      if (nDOF[FACE] > 0) 
	nNodeEl += getGeo(FACE);
    }

    node[CENTER] = nNodeEl;
    if (nDOF[CENTER] > 0)
      nNodeEl += 1;
  }


  void Mesh::dofCompress()
  {
    FUNCNAME("Mesh::dofCompress()");

    for (unsigned int iadmin = 0; iadmin < admin.size(); iadmin++) {
      DOFAdmin* compressAdmin = admin[iadmin];

      TEST_EXIT_DBG(compressAdmin)("no admin[%d] in mesh\n", iadmin);
      
      int size = compressAdmin->getSize();
      if (size < 1 || 
	  compressAdmin->getUsedDOFs() < 1 || 
	  compressAdmin->getHoleCount() < 1)    
	continue;

      newDOF.resize(size);
      
      compressAdmin->compress(newDOF);

      Flag fill_flag = (preserveCoarseDOFs ?  
			Mesh::CALL_EVERY_EL_PREORDER | Mesh::FILL_NOTHING :
			Mesh::CALL_LEAF_EL | Mesh::FILL_NOTHING);          
      TraverseStack stack;
      ElInfo *elInfo = stack.traverseFirst(this, -1, fill_flag);
      while (elInfo) {
	elInfo->getElement()->newDOFFct1(compressAdmin);
	elInfo = stack.traverseNext(elInfo);
      }

      elInfo = stack.traverseFirst(this, -1, fill_flag);
      while (elInfo) {
	elInfo->getElement()->newDOFFct2(compressAdmin);
	elInfo = stack.traverseNext(elInfo);
      }

      newDOF.resize(0);
    }       
  }


  DegreeOfFreedom *Mesh::getDOF(GeoIndex position)
  {
    FUNCNAME("Mesh::getDOF()");

    TEST_EXIT_DBG(position >= CENTER && position <= FACE)
      ("unknown position %d\n", position);

    int ndof = getNumberOfDOFs(position);
    if (ndof <= 0) 
      return NULL;

    DegreeOfFreedom *dof = new DegreeOfFreedom[ndof];

    for (int i = 0; i < getNumberOfDOFAdmin(); i++) {
      const DOFAdmin *localAdmin = &getDOFAdmin(i);
      TEST_EXIT_DBG(localAdmin)("no admin[%d]\n", i);
      
      int n  = localAdmin->getNumberOfDOFs(position);
      int n0 = localAdmin->getNumberOfPreDOFs(position);
      
      TEST_EXIT_DBG(n + n0 <= ndof)("n=%d, n0=%d too large: ndof=%d\n", n, n0, ndof);
      
      for (int j = 0; j < n; j++)
	dof[n0 + j] = const_cast<DOFAdmin*>(localAdmin)->getDOFIndex();
    }
 
    return dof;
  }


  DegreeOfFreedom **Mesh::createDOFPtrs()
  {
    FUNCNAME("Mesh::createDOFPtrs()");

    if (nNodeEl <= 0)
      return NULL;

    DegreeOfFreedom **ptrs = new DegreeOfFreedom*[nNodeEl];
    for (int i = 0; i < nNodeEl; i++)
      ptrs[i] = NULL;

    return ptrs;
  }

  void Mesh::freeDOFPtrs(DegreeOfFreedom **ptrs)
  {
    FUNCNAME("Mesh::freeDOFPtrs()");

    TEST_EXIT_DBG(ptrs)("ptrs=NULL\n");

    if (nNodeEl <= 0)
      return;
  
    delete [] ptrs;
  }


  const DOFAdmin *Mesh::createDOFAdmin(std::string lname, DimVec<int> lnDOF)
  {
    FUNCNAME("Mesh::createDOFAdmin()");

    DOFAdmin *localAdmin = new DOFAdmin(this, lname);

    for (int i = 0; i < dim + 1; i++)
      localAdmin->setNumberOfDOFs(i, lnDOF[i]);

    addDOFAdmin(localAdmin);

    return localAdmin;
  }


  const DOFAdmin* Mesh::getVertexAdmin() const
  {
    const DOFAdmin *localAdmin = NULL;

    for (int i = 0; i < static_cast<int>(admin.size()); i++) {
      if (admin[i]->getNumberOfDOFs(VERTEX)) {
	if (!localAdmin)  
	  localAdmin = admin[i];
	else if (admin[i]->getSize() < localAdmin->getSize())
	  localAdmin = admin[i];
      }
    }

    return localAdmin;
  }

  void Mesh::freeDOF(DegreeOfFreedom* dof, GeoIndex position)
  {
    FUNCNAME("Mesh::freeDOF()");

    TEST_EXIT_DBG(position >= CENTER && position <= FACE)
      ("unknown position %d\n", position);

    int ndof = nDOF[position];
    if (ndof) {
      if (!dof) {
	MSG("dof = NULL, but ndof = %d\n", ndof);
	return;
      }
    } else  {
      if (dof)
	MSG("dof != NULL, but ndof = 0\n");

      return;
    }

    TEST_EXIT_DBG(ndof <= MAX_DOF)
      ("ndof too big: ndof = %d, MAX_DOF = %d\n", ndof, MAX_DOF);

    for (int i = 0; i < static_cast<int>(admin.size()); i++) {
      DOFAdmin *localAdmin = admin[i];
      int n = localAdmin->getNumberOfDOFs(position);
      int n0 = localAdmin->getNumberOfPreDOFs(position);
      
      TEST_EXIT_DBG(n + n0 <= ndof)("n=%d, n0=%d too large: ndof=%d\n", n, n0, ndof);
      
      for (int j = 0; j < n; j++)
	localAdmin->freeDOFIndex(dof[n0 + j]);
    }

    delete [] dof;
  }

  void Mesh::freeElement(Element* el)
  {
    freeDOFPtrs(const_cast<DegreeOfFreedom**>(el->getDOF()));
    delete el;
  }


  Element* Mesh::createNewElement(Element *parent)
  {
    FUNCNAME("Mesh::createNewElement()");

    TEST_EXIT_DBG(elementPrototype)("no element prototype\n");

    Element *el = parent ? parent->clone() : elementPrototype->clone();
  
    if (!parent && elementDataPrototype)
      el->setElementData(elementDataPrototype->clone()); 
    else
      el->setElementData(NULL); // must be done in ElementData::refineElementData()
    
    return el;
  }


  ElInfo* Mesh::createNewElInfo()
  {
    FUNCNAME("Mesh::createNewElInfo()");

    switch(dim) {
    case 1:
      return new ElInfo1d(this);
      break;
    case 2:
      return new ElInfo2d(this);
      break;
    case 3:
      return new ElInfo3d(this);
      break;
    default:
      ERROR_EXIT("invalid dim\n");
      return NULL;
    }
  }


  bool Mesh::findElInfoAtPoint(const WorldVector<double>& xy,
			       ElInfo *el_info,
			       DimVec<double>& bary,
			       const MacroElement *start_mel,
			       const WorldVector<double> *xy0,
			       double *sp)
  {
    static const MacroElement *mel = NULL;
    DimVec<double> lambda(dim, NO_INIT);
    ElInfo *mel_info = createNewElInfo();

    if (start_mel != NULL)
      mel = start_mel;
    else
      if (mel == NULL || mel->getElement()->getMesh() != this)
	mel = *(macroElements.begin());

    mel_info->setFillFlag(Mesh::FILL_COORDS);
    g_xy = &xy;
    g_xy0 = xy0;
    g_sp = sp;

    mel_info->fillMacroInfo(mel);

    // We have the care about not to visite a macro element twice. In this case the
    // function would end up in an infinite loop. If a macro element is visited a 
    // second time, what can happen with periodic boundary conditions, the point is
    // not within the mesh!
    std::set<int> macrosVisited;
    macrosVisited.insert(mel->getIndex());

    int k;
    while ((k = mel_info->worldToCoord(xy, &lambda)) >= 0) {
      if (mel->getNeighbour(k)) {
	mel = mel->getNeighbour(k);
	mel = mel->getNeighbour(k);
	if (macrosVisited.count(mel->getIndex()))
	  return false;

	macrosVisited.insert(mel->getIndex());
	mel_info->fillMacroInfo(mel);
	continue;
      }
      break;
    }

    /* now, descend in tree to find leaf element at point */
    bool inside = findElementAtPointRecursive(mel_info, lambda, k, el_info);
    for (int i = 0; i <= dim; i++)
      bary[i] = final_lambda[i];   
  
    delete mel_info;

    return inside;
  }

  bool Mesh::findElementAtPoint(const WorldVector<double>&  xy,
				Element **elp, 
				DimVec<double>& bary,
				const MacroElement *start_mel,
				const WorldVector<double> *xy0,
				double *sp)
  {
    ElInfo *el_info = createNewElInfo();
    int val = findElInfoAtPoint(xy, el_info, bary, start_mel, xy0, sp);

    *elp = el_info->getElement();

    delete el_info;

    return val;
  }

  bool Mesh::findElementAtPointRecursive(ElInfo *el_info,
					 const DimVec<double>& lambda,
					 int outside,
					 ElInfo* final_el_info)
  {
    FUNCNAME("Mesh::findElementAtPointRecursive()");

    Element *el = el_info->getElement();
    DimVec<double> c_lambda(dim, NO_INIT);
    int inside;
    int ichild, c_outside;

    if (el->isLeaf()) {
      *final_el_info = *el_info;
      if (outside < 0) {
	for (int i = 0; i <= dim; i++)
	  final_lambda[i] = lambda[i];
	
	return true;
      }  else {  /* outside */
	if (g_xy0) { /* find boundary point of [xy0, xy] */
	  el_info->worldToCoord(*(g_xy0), &c_lambda);
	  double s = lambda[outside] / (lambda[outside] - c_lambda[outside]);
	  for (int i = 0; i <= dim; i++) 
	    final_lambda[i] = s * c_lambda[i] + (1.0 - s) * lambda[i];
	  
	  if (g_sp)
	    *(g_sp) = s;
	  
	  if (dim == 3) 
	    MSG("outside finest level on el %d: s=%.3e\n", el->getIndex(), s);

	  return false;  /* ??? */
	} else {
	  return false;
	}
      }
    }

    ElInfo *c_el_info = createNewElInfo();

    if (dim == 1) {
      if (lambda[0] >= lambda[1]) {
	c_el_info->fillElInfo(0, el_info);
	if (outside >= 0) {
	  outside = el_info->worldToCoord(*(g_xy), &c_lambda);
	  TEST_EXIT(outside == 0)("point outside domain\n");
	} else {
	  c_lambda[0] = lambda[0] - lambda[1];
	  c_lambda[1] = 2.0 * lambda[1];
	}
      } else {
	c_el_info->fillElInfo(1, el_info);
	if (outside >= 0)  {
	  outside = el_info->worldToCoord(*(g_xy), &c_lambda);
	  TEST_EXIT(outside == 0)("point outside domain\n");
	} else {
	  c_lambda[1] = lambda[1] - lambda[0];
	  c_lambda[0] = 2.0 * lambda[0];
	}
      }
    } /* DIM == 1 */

    if (dim == 2) {
      if (lambda[0] >= lambda[1]) {
	c_el_info->fillElInfo(0, el_info);
	if (el->isNewCoordSet()) {
	  outside = c_el_info->worldToCoord(*(g_xy), &c_lambda);
	  TEST_EXIT(outside == 0)("outside curved boundary child 0\n");	  
	} else {
	  c_lambda[0] = lambda[2];
	  c_lambda[1] = lambda[0] - lambda[1];
	  c_lambda[2] = 2.0 * lambda[1];
	}
      } else {
	c_el_info->fillElInfo(1, el_info);
	if (el->isNewCoordSet()) {
	  outside = c_el_info->worldToCoord(*(g_xy), &c_lambda);
	  TEST_EXIT(outside == 0)("outside curved boundary child 1\n");	  
	} else {
	  c_lambda[0] = lambda[1] - lambda[0];
	  c_lambda[1] = lambda[2];
	  c_lambda[2] = 2.0 * lambda[0];
	}
      }
    } /* DIM == 2 */

    if (dim == 3) {
      if (el->isNewCoordSet()) {
	if (lambda[0] >= lambda[1])
	  ichild = 0;
	else
	  ichild = 1;
	c_el_info->fillElInfo(ichild, el_info);
	c_outside = c_el_info->worldToCoord(*(g_xy), &c_lambda);

	if (c_outside>=0) {  /* test is other child is better... */
	  DimVec<double> c_lambda2(dim, NO_INIT);
	  ElInfo *c_el_info2 = createNewElInfo();

	  c_el_info2->fillElInfo(1-ichild, el_info);
	  int c_outside2 = c_el_info2->worldToCoord(*(g_xy), &c_lambda2);

	  MSG("new_coord CHILD %d: outside=%d, lambda=(%.2f %.2f %.2f %.2f)\n",
	      ichild, c_outside, c_lambda[0], c_lambda[1], c_lambda[2], c_lambda[3]);
	  MSG("new_coord CHILD %d: outside=%d, lambda=(%.2f %.2f %.2f %.2f)\n",
	      1 - ichild, c_outside2, c_lambda2[0], c_lambda2[1], c_lambda2[2],
	      c_lambda2[3]);

	  if ((c_outside2 < 0) || (c_lambda2[c_outside2] > c_lambda[c_outside])) {
	    for (int i = 0; i <= dim; i++) 
	      c_lambda[i] = c_lambda2[i];	    
	    c_outside = c_outside2;
	    *c_el_info = *c_el_info2;
	    ichild = 1 - ichild;
	  }
	  delete c_el_info2;
	}
	outside = c_outside;
      } else {  /* no new_coord */
	if (lambda[0] >= lambda[1]) {
	  c_el_info->fillElInfo(0, el_info);
	  c_lambda[0] = lambda[0] - lambda[1];
	  c_lambda[1] = 
	    lambda[Tetrahedron::childVertex[(dynamic_cast<ElInfo3d*>(el_info))->
					    getType()][0][1]];
	  c_lambda[2] = 
	    lambda[Tetrahedron::childVertex[(dynamic_cast<ElInfo3d*>(el_info))->
					    getType()][0][2]];
	  c_lambda[3] = 2.0 * lambda[1];
	} else {
	  c_el_info->fillElInfo(1, el_info);
	  c_lambda[0] = lambda[1] - lambda[0];
	  c_lambda[1] = 
	    lambda[Tetrahedron::childVertex[(dynamic_cast<ElInfo3d*>(el_info))->
					    getType()][1][1]];
	  c_lambda[2] = 
	    lambda[Tetrahedron::childVertex[(dynamic_cast<ElInfo3d*>(el_info))->
					    getType()][1][2]];
	  c_lambda[3] = 2.0 * lambda[0];
	}
      }
    }  /* DIM == 3 */

    inside = findElementAtPointRecursive(c_el_info, c_lambda, outside, final_el_info);
    delete c_el_info;

    return inside; 
  }


  bool Mesh::getDofIndexCoords(DegreeOfFreedom dof, 
			       const FiniteElemSpace* feSpace,
			       WorldVector<double>& coords)
  {
    DimVec<double>* baryCoords;
    bool found = false;
    TraverseStack stack;
    std::vector<DegreeOfFreedom> dofVec(feSpace->getBasisFcts()->getNumber());

    ElInfo *elInfo = stack.traverseFirst(this, -1, 
					 Mesh::CALL_LEAF_EL | Mesh::FILL_COORDS);    
    while (elInfo) {
      feSpace->getBasisFcts()->getLocalIndices(elInfo->getElement(),
					       feSpace->getAdmin(),
					       dofVec);
      for (int i = 0; i < feSpace->getBasisFcts()->getNumber(); i++) {
	if (dofVec[i] == dof) {
	  baryCoords = feSpace->getBasisFcts()->getCoords(i);
	  elInfo->coordToWorld(*baryCoords, coords);
	  found = true;
	  break;	  
	}
      }
      
      if (found)
	break;
      
      elInfo = stack.traverseNext(elInfo);
    }

    return found;
  }


  void Mesh::getDofIndexCoords(const FiniteElemSpace* feSpace,
			       DOFVector<WorldVector<double> >& coords)
  {
    const BasisFunction* basFcts = feSpace->getBasisFcts();
    int nBasFcts = basFcts->getNumber();
    std::vector<DegreeOfFreedom> dofVec(nBasFcts);

    TraverseStack stack;
    ElInfo *elInfo = 
      stack.traverseFirst(this, -1, Mesh::CALL_LEAF_EL | Mesh::FILL_COORDS);
    while (elInfo) {
      basFcts->getLocalIndices(elInfo->getElement(), feSpace->getAdmin(), dofVec);
      for (int i = 0; i < nBasFcts; i++) {
	DimVec<double> *baryCoords = basFcts->getCoords(i);
	elInfo->coordToWorld(*baryCoords, coords[dofVec[i]]);
      }
         
      elInfo = stack.traverseNext(elInfo);
    }

  }


  void Mesh::setDiameter(const WorldVector<double>& w) 
  { 
    diam = w; 
  }

  void Mesh::setDiameter(int i, double w) 
  { 
    diam[i] = w; 
  }

  void Mesh::serialize(std::ostream &out)
  {
    serializedDOFs.clear();

    out << name << "\n";

    SerUtil::serialize(out, dim);
    SerUtil::serialize(out, nVertices);
    SerUtil::serialize(out, nEdges);
    SerUtil::serialize(out, nLeaves);
    SerUtil::serialize(out, nElements);
    SerUtil::serialize(out, nFaces);
    SerUtil::serialize(out, maxEdgeNeigh);

    diam.serialize(out);

    SerUtil::serialize(out, preserveCoarseDOFs);
    SerUtil::serialize(out, nDOFEl);

    nDOF.serialize(out);

    SerUtil::serialize(out, nNodeEl);

    node.serialize(out);


    // === Write admins. ===

    int size = static_cast<int>(admin.size());
    SerUtil::serialize(out, size);
    for (int i = 0; i < size; i++)
      admin[i]->serialize(out);


    // === Write macroElements. ===

    size = static_cast<int>(macroElements.size());
    SerUtil::serialize(out, size);
    for (int i = 0; i < size; i++)
      macroElements[i]->serialize(out);

    SerUtil::serialize(out, elementIndex);
    SerUtil::serialize(out, initialized);


    // === Write periodic associations. ===
    int mapSize = periodicAssociations.size();
    SerUtil::serialize(out, mapSize);
    for (std::map<BoundaryType, VertexVector*>::iterator it = periodicAssociations.begin();
	 it != periodicAssociations.end(); ++it) {
      BoundaryType b = it->first;

      // Check which DOFAdmin is used for the current VertexVector we want to serialize.
      int ithAdmin = -1;
      for (int i = 0; i < static_cast<int>(admin.size()); i++) {
	if (admin[i] == it->second->getAdmin()) {
	  ithAdmin = i;
	  break;
	}
      }
      TEST_EXIT(ithAdmin >= 0)
	("No DOFAdmin found for serialization of periodic associations!\n");

      SerUtil::serialize(out, b);
      SerUtil::serialize(out, ithAdmin);