netgen/libsrc/meshing/meshfunc.cpp

#include <mystdlib.h>
#include "meshing.hpp"

namespace netgen
{
  extern const char * tetrules[];
  // extern const char * tetrules2[];
  extern const char * prismrules2[];
  extern const char * pyramidrules[];
  extern const char * pyramidrules2[];
  extern const char * hexrules[];


  // extern double teterrpow; 
  MESHING3_RESULT MeshVolume (const MeshingParameters & c_mp, Mesh& mesh3d)
  {
    static Timer t("MeshVolume"); RegionTimer reg(t);

     MeshingParameters mp = c_mp; // copy mp to change them here
     int oldne;
     int meshed;

     NgArray<INDEX_2> connectednodes;
     
     if (!mesh3d.HasLocalHFunction()) mesh3d.CalcLocalH(mp.grading);

     mesh3d.Compress();

     //  mesh3d.PrintMemInfo (cout);

     if (mp.checkoverlappingboundary)
        if (mesh3d.CheckOverlappingBoundary())
           throw NgException ("Stop meshing since boundary mesh is overlapping");

     int nonconsist = 0;
     for (int k = 1; k <= mesh3d.GetNDomains(); k++)
     {
       if(mp.only3D_domain_nr && mp.only3D_domain_nr !=k)
	 continue;
        PrintMessage (3, "Check subdomain ", k, " / ", mesh3d.GetNDomains());

        mesh3d.FindOpenElements(k);

        /*
        bool res = mesh3d.CheckOverlappingBoundary();
        if (res)
        {
        PrintError ("Surface is overlapping !!");
        nonconsist = 1;
        }
        */

        bool res = (mesh3d.CheckConsistentBoundary() != 0);
        if (res)
        {
           PrintError ("Surface mesh not consistent");
           nonconsist = 1;
        }
     }

     if (nonconsist)
     {
        PrintError ("Stop meshing since surface mesh not consistent");
        throw NgException ("Stop meshing since surface mesh not consistent");
     }

     double globmaxh = mp.maxh;

     for (int k = 1; k <= mesh3d.GetNDomains(); k++)
       {
	 if(mp.only3D_domain_nr && mp.only3D_domain_nr !=k)
	   continue;
	 if (multithread.terminate)
           break;
	 
	 PrintMessage (2, "");
	 PrintMessage (1, "Meshing subdomain ", k, " of ", mesh3d.GetNDomains());
	 (*testout) << "Meshing subdomain " << k << endl;
	 
	 mp.maxh = min2 (globmaxh, mesh3d.MaxHDomain(k));

	 mesh3d.CalcSurfacesOfNode();
	 mesh3d.FindOpenElements(k);
	 
	 if (!mesh3d.GetNOpenElements())
           continue;
	 
	 

	 Box<3> domain_bbox( Box<3>::EMPTY_BOX ); 
	 
	 for (SurfaceElementIndex sei = 0; sei < mesh3d.GetNSE(); sei++)
	   {
	     const Element2d & el = mesh3d[sei];
	     if (el.IsDeleted() ) continue;

	     if (mesh3d.GetFaceDescriptor(el.GetIndex()).DomainIn() == k ||
		 mesh3d.GetFaceDescriptor(el.GetIndex()).DomainOut() == k)
	       
	       for (int j = 0; j < el.GetNP(); j++)
		 domain_bbox.Add (mesh3d[el[j]]);
	   }
	 domain_bbox.Increase (0.01 * domain_bbox.Diam());
	 

         for (int qstep = 0; qstep <= 3; qstep++)
           // for (int qstep = 0; qstep <= 0; qstep++)  // for hex-filling
	  {
            if (qstep == 0 && !mp.try_hexes) continue;
            
	    // cout << "openquads = " << mesh3d.HasOpenQuads() << endl;
	    if (mesh3d.HasOpenQuads())
	      {
		string rulefile = ngdir;
		
		const char ** rulep = NULL;
		switch (qstep)
		  {
		  case 0:
                    rulefile = "/Users/joachim/gitlab/netgen/rules/hexa.rls";
                    rulep = hexrules;
		    break;
		  case 1:
		    rulefile += "/rules/prisms2.rls";
		    rulep = prismrules2;
		    break;
		  case 2: // connect pyramid to triangle
		    rulefile += "/rules/pyramids2.rls";
		    rulep = pyramidrules2;
		    break;
		  case 3: // connect to vis-a-vis point
		    rulefile += "/rules/pyramids.rls";
		    rulep = pyramidrules;
		    break;
		  }
		
                // Meshing3 meshing(rulefile);
                Meshing3 meshing(rulep); 
		
		MeshingParameters mpquad = mp;
		
		mpquad.giveuptol = 15;
		mpquad.baseelnp = 4;
		mpquad.starshapeclass = 1000;
		mpquad.check_impossible = qstep == 1;   // for prisms only (air domain in trafo)
		
		
		for (PointIndex pi = mesh3d.Points().Begin(); pi < mesh3d.Points().End(); pi++)
		  meshing.AddPoint (mesh3d[pi], pi);

                /*
		mesh3d.GetIdentifications().GetPairs (0, connectednodes);
		for (int i = 1; i <= connectednodes.Size(); i++)
		  meshing.AddConnectedPair (connectednodes.Get(i));
                */
                for (int nr = 1; nr <= mesh3d.GetIdentifications().GetMaxNr(); nr++)
                  if (mesh3d.GetIdentifications().GetType(nr) != Identifications::PERIODIC)
                    {
                      mesh3d.GetIdentifications().GetPairs (nr, connectednodes);
                      for (auto pair : connectednodes)
                        meshing.AddConnectedPair (pair);
                    }
                
		for (int i = 1; i <= mesh3d.GetNOpenElements(); i++)
		  {
		    Element2d hel = mesh3d.OpenElement(i);
		    meshing.AddBoundaryElement (hel);
		  }
		
		oldne = mesh3d.GetNE();
		
		meshing.GenerateMesh (mesh3d, mpquad);
		
		for (int i = oldne + 1; i <= mesh3d.GetNE(); i++)
		  mesh3d.VolumeElement(i).SetIndex (k);
		
		(*testout) 
		  << "mesh has " << mesh3d.GetNE() << " prism/pyramid elements" << endl;
		
		mesh3d.FindOpenElements(k);
	      }
	  }
	

        if (mesh3d.HasOpenQuads())
        {
           PrintSysError ("mesh has still open quads");
           throw NgException ("Stop meshing since too many attempts");
           // return MESHING3_GIVEUP;
        }


        if (mp.delaunay && mesh3d.GetNOpenElements())
        {
           Meshing3 meshing((const char**)NULL);

           mesh3d.FindOpenElements(k);

           /*
           for (PointIndex pi = mesh3d.Points().Begin(); pi < mesh3d.Points().End(); pi++)
              meshing.AddPoint (mesh3d[pi], pi);
           */
           for (PointIndex pi : mesh3d.Points().Range())
              meshing.AddPoint (mesh3d[pi], pi);

           for (int i = 1; i <= mesh3d.GetNOpenElements(); i++)
              meshing.AddBoundaryElement (mesh3d.OpenElement(i));

           oldne = mesh3d.GetNE();

           meshing.Delaunay (mesh3d, k, mp);

           for (int i = oldne + 1; i <= mesh3d.GetNE(); i++)
              mesh3d.VolumeElement(i).SetIndex (k);

           PrintMessage (3, mesh3d.GetNP(), " points, ",
              mesh3d.GetNE(), " elements");
        }


        int cntsteps = 0;
        if (mesh3d.GetNOpenElements())
          do
            {
              if (multithread.terminate)
                break;
              
              mesh3d.FindOpenElements(k);
              PrintMessage (5, mesh3d.GetNOpenElements(), " open faces");
              cntsteps++;

              if (cntsteps > mp.maxoutersteps) 
                 throw NgException ("Stop meshing since too many attempts");

              string rulefile = ngdir + "/tetra.rls";
              PrintMessage (1, "start tetmeshing");

              //	  Meshing3 meshing(rulefile);
              Meshing3 meshing(tetrules);

              NgArray<int, PointIndex::BASE> glob2loc(mesh3d.GetNP());
              glob2loc = -1;

              for (PointIndex pi = mesh3d.Points().Begin(); pi < mesh3d.Points().End(); pi++)
                if (domain_bbox.IsIn (mesh3d[pi]))
                    glob2loc[pi] = 
                    meshing.AddPoint (mesh3d[pi], pi);

              for (int i = 1; i <= mesh3d.GetNOpenElements(); i++)
              {
                 Element2d hel = mesh3d.OpenElement(i);
                 for (int j = 0; j < hel.GetNP(); j++)
                    hel[j] = glob2loc[hel[j]];
                 meshing.AddBoundaryElement (hel);
                 // meshing.AddBoundaryElement (mesh3d.OpenElement(i));
              }

              oldne = mesh3d.GetNE();

              mp.giveuptol = 15 + 10 * cntsteps; 
              mp.sloppy = 5;
              meshing.GenerateMesh (mesh3d, mp);
              
              for (ElementIndex ei = oldne; ei < mesh3d.GetNE(); ei++)
                 mesh3d[ei].SetIndex (k);
              

              mesh3d.CalcSurfacesOfNode();
              mesh3d.FindOpenElements(k);

              // teterrpow = 2;
              if (mesh3d.GetNOpenElements() != 0)
              {
                 meshed = 0;
                 PrintMessage (5, mesh3d.GetNOpenElements(), " open faces found");

                 MeshOptimize3d optmesh(mp);

                 const char * optstr = "mcmstmcmstmcmstmcm";
                 for (size_t j = 1; j <= strlen(optstr); j++)
                 {
                    mesh3d.CalcSurfacesOfNode();
                    mesh3d.FreeOpenElementsEnvironment(2);
                    mesh3d.CalcSurfacesOfNode();

                    switch (optstr[j-1])
                    {
                    case 'c': optmesh.CombineImprove(mesh3d, OPT_REST); break;
                    case 'd': optmesh.SplitImprove(mesh3d, OPT_REST); break;
                    case 's': optmesh.SwapImprove(mesh3d, OPT_REST); break;
                    case 't': optmesh.SwapImprove2(mesh3d, OPT_REST); break;
                    case 'm': mesh3d.ImproveMesh(mp, OPT_REST); break;
                    }	  

                 }

                 mesh3d.FindOpenElements(k);	      
                 PrintMessage (3, "Call remove problem");
                 RemoveProblem (mesh3d, k);
                 mesh3d.FindOpenElements(k);
              }
              else
                {
                 meshed = 1;
                 PrintMessage (1, "Success !");
                }
            }
          while (!meshed);
        
        PrintMessage (1, mesh3d.GetNP(), " points, ",
                      mesh3d.GetNE(), " elements");
       }
     
     mp.maxh = globmaxh;

     MeshQuality3d (mesh3d);

     return MESHING3_OK;
  }  




  /*


  MESHING3_RESULT MeshVolumeOld (MeshingParameters & mp, Mesh& mesh3d)
  {
  int i, k, oldne;


  int meshed;
  int cntsteps; 


  PlotStatistics3d * pstat;
  if (globflags.GetNumFlag("silentflag", 1) <= 2)
  pstat = new XPlotStatistics3d;
  else
  pstat = new TerminalPlotStatistics3d;

  cntsteps = 0;
  do
  {
  cntsteps++;
  if (cntsteps > mp.maxoutersteps) 
  {
  return MESHING3_OUTERSTEPSEXCEEDED;
  }


  int noldp = mesh3d.GetNP();
      
      
  if ( (cntsteps == 1) && globflags.GetDefineFlag ("delaunay"))
  {
  cntsteps ++;

  mesh3d.CalcSurfacesOfNode();


  for (k = 1; k <= mesh3d.GetNDomains(); k++)
  {
  Meshing3 meshing(NULL, pstat);

  mesh3d.FindOpenElements(k);
	      
  for (i = 1; i <= noldp; i++)
  meshing.AddPoint (mesh3d.Point(i), i);
	      
  for (i = 1; i <= mesh3d.GetNOpenElements(); i++)
  {
  if (mesh3d.OpenElement(i).GetIndex() == k)
  meshing.AddBoundaryElement (mesh3d.OpenElement(i));
  }
	      
  oldne = mesh3d.GetNE();
  if (globflags.GetDefineFlag ("blockfill"))
  {
  if (!globflags.GetDefineFlag ("localh"))
  meshing.BlockFill 
  (mesh3d, mp.h * globflags.GetNumFlag ("relblockfillh", 1));
  else
  meshing.BlockFillLocalH (mesh3d);
  }
	      
  MeshingParameters mpd;
  meshing.Delaunay (mesh3d, mpd);

  for (i = oldne + 1; i <= mesh3d.GetNE(); i++)
  mesh3d.VolumeElement(i).SetIndex (k);
  }
  }

  noldp = mesh3d.GetNP();

  mesh3d.CalcSurfacesOfNode();
  mesh3d.FindOpenElements();
  for (k = 1; k <= mesh3d.GetNDomains(); k++)
  {
  Meshing3 meshing(globflags.GetStringFlag ("rules3d", NULL), pstat);
      
  Point3d pmin, pmax;
  mesh3d.GetBox (pmin, pmax, k);
	  
  rot.SetCenter (Center (pmin, pmax));

  for (i = 1; i <= noldp; i++)
  meshing.AddPoint (mesh3d.Point(i), i);

  for (i = 1; i <= mesh3d.GetNOpenElements(); i++)
  {
  if (mesh3d.OpenElement(i).GetIndex() == k)
  meshing.AddBoundaryElement (mesh3d.OpenElement(i));
  }

  oldne = mesh3d.GetNE();


  if ( (cntsteps == 1) && globflags.GetDefineFlag ("blockfill"))
  {
  if (!globflags.GetDefineFlag ("localh"))
  {
  meshing.BlockFill 
  (mesh3d, 
  mp.h * globflags.GetNumFlag ("relblockfillh", 1));
  }
  else
  {
  meshing.BlockFillLocalH (mesh3d);
  }
  }


  mp.giveuptol = int(globflags.GetNumFlag ("giveuptol", 15));

  meshing.GenerateMesh (mesh3d, mp);

  for (i = oldne + 1; i <= mesh3d.GetNE(); i++)
  mesh3d.VolumeElement(i).SetIndex (k);
  }



  mesh3d.CalcSurfacesOfNode();
  mesh3d.FindOpenElements();
      
  teterrpow = 2;
  if (mesh3d.GetNOpenElements() != 0)
  {
  meshed = 0;
  (*mycout) << "Open elements found, old" << endl;
  const char * optstr = "mcmcmcmcm";
  int j;
  for (j = 1; j <= strlen(optstr); j++)
  switch (optstr[j-1])
  {
  case 'c': mesh3d.CombineImprove(); break;
  case 'd': mesh3d.SplitImprove(); break;
  case 's': mesh3d.SwapImprove(); break;
  case 'm': mesh3d.ImproveMesh(2); break;
  }	  
	  
  (*mycout) << "Call remove" << endl;
  RemoveProblem (mesh3d);
  (*mycout) << "Problem removed" << endl;
  }
  else
  meshed = 1;
  }
  while (!meshed);

  MeshQuality3d (mesh3d);

  return MESHING3_OK;
  }  

  */




  /*
  MESHING3_RESULT MeshMixedVolume(MeshingParameters & mp, Mesh& mesh3d)
  {
    int i, j;
    MESHING3_RESULT res;
    Point3d pmin, pmax;

    mp.giveuptol = 10;
    mp.baseelnp = 4;
    mp.starshapeclass = 100;

    //  TerminalPlotStatistics3d pstat;
  
    Meshing3 meshing1("pyramids.rls");
    for (i = 1; i <= mesh3d.GetNP(); i++)
      meshing1.AddPoint (mesh3d.Point(i), i);

    mesh3d.FindOpenElements();
    for (i = 1; i <= mesh3d.GetNOpenElements(); i++)
      if (mesh3d.OpenElement(i).GetIndex() == 1)
	meshing1.AddBoundaryElement (mesh3d.OpenElement(i));

    res = meshing1.GenerateMesh (mesh3d, mp);

    mesh3d.GetBox (pmin, pmax);
    PrintMessage (1, "Mesh pyramids, res = ", res);
    if (res)
      exit (1);


    for (i = 1; i <= mesh3d.GetNE(); i++)
      mesh3d.VolumeElement(i).SetIndex (1);

    // do delaunay
  
    mp.baseelnp = 0;
    mp.starshapeclass = 5;

    Meshing3 meshing2(NULL);
    for (i = 1; i <= mesh3d.GetNP(); i++)
      meshing2.AddPoint (mesh3d.Point(i), i);
    
    mesh3d.FindOpenElements();
    for (i = 1; i <= mesh3d.GetNOpenElements(); i++)
      if (mesh3d.OpenElement(i).GetIndex() == 1)
	meshing2.AddBoundaryElement (mesh3d.OpenElement(i));

    MeshingParameters mpd;
    meshing2.Delaunay (mesh3d, mpd);

    for (i = 1; i <= mesh3d.GetNE(); i++)
      mesh3d.VolumeElement(i).SetIndex (1);


    mp.baseelnp = 0;
    mp.giveuptol = 10;

    for (int trials = 1; trials <= 50; trials++)
      {
	if (multithread.terminate)
	  return MESHING3_TERMINATE;

	Meshing3 meshing3("tetra.rls");
	for (i = 1; i <= mesh3d.GetNP(); i++)
	  meshing3.AddPoint (mesh3d.Point(i), i);
      
	mesh3d.FindOpenElements();
	for (i = 1; i <= mesh3d.GetNOpenElements(); i++)
	  if (mesh3d.OpenElement(i).GetIndex() == 1)
	    meshing3.AddBoundaryElement (mesh3d.OpenElement(i));
      
	if (trials > 1)
	  CheckSurfaceMesh2 (mesh3d);
	res = meshing3.GenerateMesh (mesh3d, mp);
      
	for (i = 1; i <= mesh3d.GetNE(); i++)
	  mesh3d.VolumeElement(i).SetIndex (1);

	if (res == 0) break;



	for (i = 1; i <= mesh3d.GetNE(); i++)
	  {
	    const Element & el = mesh3d.VolumeElement(i);
	    if (el.GetNP() != 4)
	      {
		for (j = 1; j <= el.GetNP(); j++)
		  mesh3d.AddLockedPoint (el.PNum(j));
	      }
	  }

	mesh3d.CalcSurfacesOfNode();
	mesh3d.FindOpenElements();

	MeshOptimize3d optmesh;

	teterrpow = 2;
	const char * optstr = "mcmcmcmcm";
	for (j = 1; j <= strlen(optstr); j++)
	  switch (optstr[j-1])
	    {
	    case 'c': optmesh.CombineImprove(mesh3d, OPT_REST); break;
	    case 'd': optmesh.SplitImprove(mesh3d); break;
	    case 's': optmesh.SwapImprove(mesh3d); break;
	    case 'm': mesh3d.ImproveMesh(); break;
	    }	  
	        
	RemoveProblem (mesh3d);
      }


    PrintMessage (1, "Meshing tets, res = ", res);
    if (res)
      {
	mesh3d.FindOpenElements();
	PrintSysError (1, "Open elements: ", mesh3d.GetNOpenElements());
	exit (1);
      }


  
    for (i = 1; i <= mesh3d.GetNE(); i++)
      {
	const Element & el = mesh3d.VolumeElement(i);
	if (el.GetNP() != 4)
	  {
	    for (j = 1; j <= el.GetNP(); j++)
	      mesh3d.AddLockedPoint (el.PNum(j));
	  }
      }
  
    mesh3d.CalcSurfacesOfNode();
    mesh3d.FindOpenElements();
  
    MeshOptimize3d optmesh;

    teterrpow = 2;
    const char * optstr = "mcmcmcmcm";
    for (j = 1; j <= strlen(optstr); j++)
      switch (optstr[j-1])
	{
	case 'c': optmesh.CombineImprove(mesh3d, OPT_REST); break;
	case 'd': optmesh.SplitImprove(mesh3d); break;
	case 's': optmesh.SwapImprove(mesh3d); break;
	case 'm': mesh3d.ImproveMesh(); break;
	}	  


    return MESHING3_OK;
  }
*/






  MESHING3_RESULT OptimizeVolume (const MeshingParameters & mp, 
				  Mesh & mesh3d)
    //				  const CSGeometry * geometry)
  {
    static Timer t("OptimizeVolume"); RegionTimer reg(t);
    
    int i;

    PrintMessage (1, "Volume Optimization");

    /*
      if (!mesh3d.PureTetMesh())
      return MESHING3_OK;
    */

    // (*mycout) << "optstring = " << mp.optimize3d << endl;
    /*
      const char * optstr = globflags.GetStringFlag ("optimize3d", "cmh");
      int optsteps = int (globflags.GetNumFlag ("optsteps3d", 2));
    */

    mesh3d.CalcSurfacesOfNode();
    for (i = 1; i <= mp.optsteps3d; i++)
      {
	if (multithread.terminate)
	  break;

	MeshOptimize3d optmesh(mp);

	// teterrpow = mp.opterrpow;
	// for (size_t j = 1; j <= strlen(mp.optimize3d); j++)
        for (size_t j = 1; j <= mp.optimize3d.length(); j++)
	  {
	    if (multithread.terminate)
	      break;

	    switch (mp.optimize3d[j-1])
	      {
	      case 'c': optmesh.CombineImprove(mesh3d, OPT_REST); break;
	      case 'd': optmesh.SplitImprove(mesh3d); break;
	      case 's': optmesh.SwapImprove(mesh3d); break;
                // case 'u': optmesh.SwapImproveSurface(mesh3d); break;
	      case 't': optmesh.SwapImprove2(mesh3d); break;
#ifdef SOLIDGEOM
	      case 'm': mesh3d.ImproveMesh(*geometry); break;
	      case 'M': mesh3d.ImproveMesh(*geometry); break;
#else
	      case 'm': mesh3d.ImproveMesh(mp); break;
	      case 'M': mesh3d.ImproveMesh(mp); break;
#endif
	      case 'j': mesh3d.ImproveMeshJacobian(mp); break;
	      }
	  }
	// mesh3d.mglevels = 1;
	MeshQuality3d (mesh3d);
      }
  
    return MESHING3_OK;
  }




  void RemoveIllegalElements (Mesh & mesh3d)
  {
    static Timer t("RemoveIllegalElements"); RegionTimer reg(t);
    
    int it = 10;
    int nillegal, oldn;

    PrintMessage (1, "Remove Illegal Elements");
    // return, if non-pure tet-mesh
    /*
      if (!mesh3d.PureTetMesh())
      return;
    */
    mesh3d.CalcSurfacesOfNode();

    nillegal = mesh3d.MarkIllegalElements();

    MeshingParameters dummymp;
    MeshOptimize3d optmesh(dummymp);
    while (nillegal && (it--) > 0)
      {
	if (multithread.terminate)
	  break;

	PrintMessage (5, nillegal, " illegal tets");
        optmesh.SplitImprove (mesh3d, OPT_LEGAL);

	mesh3d.MarkIllegalElements();  // test
	optmesh.SwapImprove (mesh3d, OPT_LEGAL);
	mesh3d.MarkIllegalElements();  // test
	optmesh.SwapImprove2 (mesh3d, OPT_LEGAL);

	oldn = nillegal;
	nillegal = mesh3d.MarkIllegalElements();

	if (oldn != nillegal)
	  it = 10;
      }
    PrintMessage (5, nillegal, " illegal tets");
  }
}