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https://github.com/NGSolve/netgen.git
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727 lines
21 KiB
C++
727 lines
21 KiB
C++
#include <set>
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#include <mystdlib.h>
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#include "meshing.hpp"
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#include "debugging.hpp"
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namespace netgen
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{
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extern const char * tetrules[];
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// extern const char * tetrules2[];
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extern const char * prismrules2[];
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extern const char * pyramidrules[];
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extern const char * pyramidrules2[];
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extern const char * hexrules[];
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struct MeshingData
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{
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int domain;
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// mesh for one domain (contains all adjacent surface elements)
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unique_ptr<Mesh> mesh;
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// maps from local (domain) mesh to global mesh
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Array<PointIndex, PointIndex> pmap;
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// Array<INDEX_2> connected_pairs;
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MeshingParameters mp;
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unique_ptr<Meshing3> meshing;
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};
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// extract surface meshes belonging to individual domains
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Array<MeshingData> DivideMesh(Mesh & mesh, const MeshingParameters & mp)
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{
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static Timer timer("DivideMesh"); RegionTimer rt(timer);
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Array<MeshingData> ret;
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auto num_domains = mesh.GetNDomains();
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if(num_domains==1 || mp.only3D_domain_nr)
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{
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ret.SetSize(1);
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// no need to divide mesh, just fill in meshing data
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ret[0].domain = 1;
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if(mp.only3D_domain_nr)
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ret[0].domain = mp.only3D_domain_nr;
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ret[0].mesh.reset(&mesh); // careful, this unique_ptr must not delete &mesh! (it will be released in MergeMeshes after meshing)
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ret[0].mp = mp;
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return ret;
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}
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ret.SetSize(num_domains);
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Array<Array<PointIndex, PointIndex>> ipmap;
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ipmap.SetSize(num_domains);
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auto dim = mesh.GetDimension();
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auto num_points = mesh.GetNP();
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auto num_facedescriptors = mesh.GetNFD();
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for(auto i : Range(ret))
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{
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auto & md = ret[i];
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md.domain = i+1;
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md.mp = mp;
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md.mp.maxh = min2 (mp.maxh, mesh.MaxHDomain(md.domain));
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ret[i].mesh = make_unique<Mesh>();
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auto & m = *ret[i].mesh;
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m.SetLocalH(mesh.GetLocalH());
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ipmap[i].SetSize(num_points);
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ipmap[i] = PointIndex::INVALID;
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m.SetDimension( mesh.GetDimension() );
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m.SetGeometry( mesh.GetGeometry() );
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for(auto i : Range(1, num_facedescriptors+1))
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m.AddFaceDescriptor( mesh.GetFaceDescriptor(i) );
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}
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// mark used points for each domain, add surface elements (with wrong point numbers) to domain mesh
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for(const auto & sel : mesh.SurfaceElements())
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{
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const auto & fd = mesh.GetFaceDescriptor(sel.GetIndex());
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int dom_in = fd.DomainIn();
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int dom_out = fd.DomainOut();
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for( auto dom : {dom_in, dom_out} )
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{
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if(dom==0)
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continue;
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auto & sels = ret[dom-1].mesh->SurfaceElements();
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for(auto pi : sel.PNums())
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ipmap[dom-1][pi] = 1;
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sels.Append(sel);
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}
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}
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// mark used points for already existing volume elements, add them (with wrong point numbers) to domain mesh
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for(const auto & el : mesh.VolumeElements())
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{
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auto dom = el.GetIndex();
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auto & els = ret[dom-1].mesh->VolumeElements();
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for(auto pi : el.PNums())
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ipmap[dom-1][pi] = 1;
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els.Append(el);
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}
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// mark locked/fixed points for each domain TODO: domain bounding box to add only relevant points?
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for(auto pi : mesh.LockedPoints())
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for(auto i : Range(ret))
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ipmap[i][pi] = 2;
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// add used points to domain mesh, build point mapping
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for(auto i : Range(ret))
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{
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auto & m = *ret[i].mesh;
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auto & pmap = ret[i].pmap;
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for(auto pi : Range(ipmap[i]))
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if(ipmap[i][pi])
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{
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const auto& mp = mesh[pi];
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auto pi_new = m.AddPoint( mp, mp.GetLayer(), mp.Type() );
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if(ipmap[i][pi] == 2)
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mesh.AddLockedPoint(pi_new);
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ipmap[i][pi] = pi_new;
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pmap.Append( pi );
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}
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}
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// add segments
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for(auto i : Range(ret))
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{
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auto & imap = ipmap[i];
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auto & m = *ret[i].mesh;
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for(auto seg : mesh.LineSegments())
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if(imap[seg[0]].IsValid() && imap[seg[1]].IsValid())
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{
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seg[0] = imap[seg[0]];
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seg[1] = imap[seg[1]];
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m.AddSegment(seg);
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}
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}
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auto & identifications = mesh.GetIdentifications();
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for(auto i : Range(ret))
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{
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auto & m = *ret[i].mesh;
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auto & imap = ipmap[i];
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auto nmax = identifications.GetMaxNr ();
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auto & m_ident = m.GetIdentifications();
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for (auto & sel : m.SurfaceElements())
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for(auto & pi : sel.PNums())
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pi = imap[pi];
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for (auto & el : m.VolumeElements())
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for(auto & pi : el.PNums())
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pi = imap[pi];
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for(auto n : Range(1,nmax+1))
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{
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NgArray<INDEX_2> pairs;
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identifications.GetPairs(n, pairs);
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for(auto pair : pairs)
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{
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auto pi0 = imap[pair[0]];
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auto pi1 = imap[pair[1]];
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if(!pi0.IsValid() || !pi1.IsValid())
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continue;
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m_ident.Add(pi0, pi1, n);
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}
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m_ident.SetType( n, identifications.GetType(n) );
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}
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}
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return ret;
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}
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// Add between identified surface elements (only consider closesurface identifications)
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void FillCloseSurface( MeshingData & md)
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{
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static Timer timer("FillCloseSurface"); RegionTimer rtimer(timer);
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auto & mesh = *md.mesh;
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auto & identifications = mesh.GetIdentifications();
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auto nmax = identifications.GetMaxNr();
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bool have_closesurfaces = false;
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for(auto i : Range(1,nmax+1))
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if(identifications.GetType(i) == Identifications::CLOSESURFACES)
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have_closesurfaces = true;
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if(!have_closesurfaces)
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return;
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NgArray<int, PointIndex::BASE> map;
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std::set<std::tuple<int,int,int>> hex_faces;
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for(auto identnr : Range(1,nmax+1))
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{
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if(identifications.GetType(identnr) != Identifications::CLOSESURFACES)
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continue;
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identifications.GetMap(identnr, map);
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mesh.FindOpenElements(md.domain);
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for(auto & sel : mesh.OpenElements())
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{
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// For quads: check if this open element is already closed by a hex
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// this happends when we have identifications in two directions
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if(sel.GetNP() == 4)
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{
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Element2d face = sel;
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face.NormalizeNumbering();
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if(hex_faces.count({face[0], face[1], face[2]}))
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continue;
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}
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bool is_mapped = true;
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for(auto pi : sel.PNums())
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if(!PointIndex(map[pi]).IsValid())
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is_mapped = false;
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if(!is_mapped)
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continue;
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// insert prism/hex
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auto np = sel.GetNP();
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Element el(2*np);
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std::set<int> pis;
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for(auto i : Range(np))
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{
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el[i] = sel[i];
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el[i+np] = map[sel[i]];
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pis.insert(sel[i]);
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pis.insert(map[sel[i]]);
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}
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// degenerate element (mapped element onto itself, might happen for surface elements connecting two identified faces)
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if(pis.size() < 2*np)
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continue;
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// check if new element is inside current domain
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auto p0 = mesh[sel[0]];
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Vec<3> n = -Cross(mesh[sel[1]] - p0, mesh[sel[2]] - p0 );
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if(n*(mesh[el[np]]-p0) < 0.0)
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continue;
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el.SetIndex(md.domain);
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mesh.AddVolumeElement(el);
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if(el.NP()==8)
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{
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// remember all adjacent faces of the new hex (to skip corresponding openelements accordingly)
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for(auto facei : Range(1,7))
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{
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Element2d face;
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el.GetFace(facei, face);
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face.NormalizeNumbering();
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hex_faces.insert({face[0], face[1], face[2]});
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}
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}
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}
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}
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}
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void CloseOpenQuads( MeshingData & md)
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{
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static Timer t("CloseOpenQuads"); RegionTimer rt(t);
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auto & mesh = *md.mesh;
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auto domain = md.domain;
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MeshingParameters & mp = md.mp;
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int oldne;
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if (multithread.terminate)
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return;
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mesh.CalcSurfacesOfNode();
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mesh.FindOpenElements(domain);
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if (!mesh.GetNOpenElements())
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return;
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for (int qstep = 0; qstep <= 3; qstep++)
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{
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if (qstep == 0 && !mp.try_hexes) continue;
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if (mesh.HasOpenQuads())
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{
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string rulefile = ngdir;
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const char ** rulep = NULL;
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switch (qstep)
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{
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case 0:
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rulep = hexrules;
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break;
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case 1:
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rulep = prismrules2;
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break;
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case 2: // connect pyramid to triangle
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rulep = pyramidrules2;
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break;
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case 3: // connect to vis-a-vis point
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rulep = pyramidrules;
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break;
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}
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Meshing3 meshing(rulep);
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MeshingParameters mpquad = mp;
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mpquad.giveuptol = mp.giveuptolopenquads;
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mpquad.baseelnp = 4;
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mpquad.starshapeclass = 1000;
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mpquad.check_impossible = qstep == 1; // for prisms only (air domain in trafo)
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for (PointIndex pi : mesh.Points().Range())
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meshing.AddPoint (mesh[pi], pi);
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NgArray<INDEX_2> connectednodes;
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for (int nr = 1; nr <= mesh.GetIdentifications().GetMaxNr(); nr++)
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if (mesh.GetIdentifications().GetType(nr) != Identifications::PERIODIC)
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{
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mesh.GetIdentifications().GetPairs (nr, connectednodes);
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for (auto pair : connectednodes)
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{
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meshing.AddConnectedPair (pair);
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meshing.AddConnectedPair ({pair[1], pair[0]});
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}
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}
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for (int i = 1; i <= mesh.GetNOpenElements(); i++)
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{
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Element2d hel = mesh.OpenElement(i);
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meshing.AddBoundaryElement (hel);
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}
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oldne = mesh.GetNE();
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meshing.GenerateMesh (mesh, mpquad);
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for (int i = oldne + 1; i <= mesh.GetNE(); i++)
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mesh.VolumeElement(i).SetIndex (domain);
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(*testout)
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<< "mesh has " << mesh.GetNE() << " prism/pyramid elements" << endl;
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mesh.FindOpenElements(domain);
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}
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}
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if (mesh.HasOpenQuads())
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{
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PrintSysError ("mesh has still open quads");
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throw NgException ("Stop meshing since too many attempts");
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// return MESHING3_GIVEUP;
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}
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}
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void MeshDomain( MeshingData & md)
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{
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auto & mesh = *md.mesh;
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auto domain = md.domain;
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MeshingParameters & mp = md.mp;
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mesh.CalcSurfacesOfNode();
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mesh.FindOpenElements(md.domain);
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md.meshing = make_unique<Meshing3>(nullptr);
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for (PointIndex pi : mesh.Points().Range())
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md.meshing->AddPoint (mesh[pi], pi);
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for (int i = 1; i <= mesh.GetNOpenElements(); i++)
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md.meshing->AddBoundaryElement (mesh.OpenElement(i));
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if (mp.delaunay && mesh.GetNOpenElements())
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{
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int oldne = mesh.GetNE();
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md.meshing->Delaunay (mesh, domain, mp);
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for (int i = oldne + 1; i <= mesh.GetNE(); i++)
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mesh.VolumeElement(i).SetIndex (domain);
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PrintMessage (3, mesh.GetNP(), " points, ",
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mesh.GetNE(), " elements");
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}
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Box<3> domain_bbox( Box<3>::EMPTY_BOX );
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for (auto & sel : mesh.SurfaceElements())
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{
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if (sel.IsDeleted() ) continue;
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for (auto pi : sel.PNums())
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domain_bbox.Add (mesh[pi]);
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}
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domain_bbox.Increase (0.01 * domain_bbox.Diam());
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mesh.FindOpenElements(domain);
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int cntsteps = 0;
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int meshed;
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if (mesh.GetNOpenElements())
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do
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{
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if (multithread.terminate)
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break;
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mesh.FindOpenElements(domain);
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PrintMessage (5, mesh.GetNOpenElements(), " open faces");
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// GetOpenElements( mesh, domain )->Save("open_"+ToString(cntsteps)+".vol");
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cntsteps++;
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if (cntsteps > mp.maxoutersteps)
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throw NgException ("Stop meshing since too many attempts");
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PrintMessage (1, "start tetmeshing");
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Meshing3 meshing(tetrules);
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Array<PointIndex, PointIndex> glob2loc(mesh.GetNP());
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glob2loc = PointIndex::INVALID;
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for (PointIndex pi : mesh.Points().Range())
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if (domain_bbox.IsIn (mesh[pi]))
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glob2loc[pi] = meshing.AddPoint (mesh[pi], pi);
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for (auto sel : mesh.OpenElements() )
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{
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for(auto & pi : sel.PNums())
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pi = glob2loc[pi];
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meshing.AddBoundaryElement (sel);
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}
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int oldne = mesh.GetNE();
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mp.giveuptol = 15 + 10 * cntsteps;
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mp.sloppy = 5;
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meshing.GenerateMesh (mesh, mp);
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for (ElementIndex ei = oldne; ei < mesh.GetNE(); ei++)
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mesh[ei].SetIndex (domain);
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mesh.CalcSurfacesOfNode();
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mesh.FindOpenElements(domain);
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// teterrpow = 2;
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if (mesh.GetNOpenElements() != 0)
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{
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meshed = 0;
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PrintMessage (5, mesh.GetNOpenElements(), " open faces found");
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MeshOptimize3d optmesh(mp);
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const char * optstr = "mcmstmcmstmcmstmcm";
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for (size_t j = 1; j <= strlen(optstr); j++)
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{
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mesh.FindOpenElements();
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mesh.CalcSurfacesOfNode();
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mesh.FreeOpenElementsEnvironment(2);
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mesh.CalcSurfacesOfNode();
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switch (optstr[j-1])
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{
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case 'c': optmesh.CombineImprove(mesh, OPT_REST); break;
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case 'd': optmesh.SplitImprove(mesh, OPT_REST); break;
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case 's': optmesh.SwapImprove(mesh, OPT_REST); break;
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case 't': optmesh.SwapImprove2(mesh, OPT_REST); break;
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case 'm': mesh.ImproveMesh(mp, OPT_REST); break;
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}
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}
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mesh.FindOpenElements(domain);
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PrintMessage (3, "Call remove problem");
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RemoveProblem (mesh, domain);
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mesh.FindOpenElements(domain);
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}
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else
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{
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meshed = 1;
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PrintMessage (1, "Success !");
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}
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}
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while (!meshed);
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{
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PrintMessage (3, "Check subdomain ", domain, " / ", mesh.GetNDomains());
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mesh.FindOpenElements(domain);
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bool res = (mesh.CheckConsistentBoundary() != 0);
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if (res)
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{
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PrintError ("Surface mesh not consistent");
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throw NgException ("Stop meshing since surface mesh not consistent");
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}
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}
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}
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void MergeMeshes( Mesh & mesh, Array<MeshingData> & md )
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{
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// todo: optimize: count elements, alloc all memory, copy vol elements in parallel
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static Timer t("MergeMeshes"); RegionTimer rt(t);
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if(md.Size()==1)
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{
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// assume that mesh was never divided, no need to do anything
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if(&mesh != md[0].mesh.get())
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throw Exception("Illegal Mesh pointer in MeshingData");
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md[0].mesh.release();
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return;
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}
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for(auto & m_ : md)
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{
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auto first_new_pi = m_.pmap.Range().Next();
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auto & m = *m_.mesh;
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Array<PointIndex, PointIndex> pmap(m.Points().Size());
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for(auto pi : Range(PointIndex(PointIndex::BASE), first_new_pi))
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pmap[pi] = m_.pmap[pi];
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for (auto pi : Range(first_new_pi, m.Points().Range().Next()))
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pmap[pi] = mesh.AddPoint(m[pi]);
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for ( auto el : m.VolumeElements() )
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{
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for (auto i : Range(el.GetNP()))
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el[i] = pmap[el[i]];
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el.SetIndex(m_.domain);
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mesh.AddVolumeElement(el);
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}
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}
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}
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void MergeMeshes( Mesh & mesh, FlatArray<Mesh> meshes, PointIndex first_new_pi )
|
||
{
|
||
// todo: optimize: count elements, alloc all memory, copy vol elements in parallel
|
||
static Timer t("MergeMeshes"); RegionTimer rt(t);
|
||
for(auto & m : meshes)
|
||
{
|
||
Array<PointIndex, PointIndex> pmap(m.Points().Size());
|
||
for(auto pi : Range(PointIndex(PointIndex::BASE), first_new_pi))
|
||
pmap[pi] = pi;
|
||
|
||
for (auto pi : Range(first_new_pi, m.Points().Range().Next()))
|
||
pmap[pi] = mesh.AddPoint(m[pi]);
|
||
|
||
|
||
for ( auto el : m.VolumeElements() )
|
||
{
|
||
for (auto i : Range(el.GetNP()))
|
||
el[i] = pmap[el[i]];
|
||
mesh.AddVolumeElement(el);
|
||
}
|
||
}
|
||
}
|
||
|
||
// extern double teterrpow;
|
||
MESHING3_RESULT MeshVolume (const MeshingParameters & mp, Mesh& mesh3d)
|
||
{
|
||
static Timer t("MeshVolume"); RegionTimer reg(t);
|
||
|
||
mesh3d.Compress();
|
||
|
||
|
||
|
||
if(mesh3d.GetNDomains()==0)
|
||
return MESHING3_OK;
|
||
|
||
if (!mesh3d.HasLocalHFunction())
|
||
mesh3d.CalcLocalH(mp.grading);
|
||
|
||
auto md = DivideMesh(mesh3d, mp);
|
||
|
||
try
|
||
{
|
||
ParallelFor( md.Range(), [&](int i)
|
||
{
|
||
if (mp.checkoverlappingboundary)
|
||
if (md[i].mesh->CheckOverlappingBoundary())
|
||
throw NgException ("Stop meshing since boundary mesh is overlapping");
|
||
|
||
if(md[i].mesh->GetGeometry()->GetGeomType() == Mesh::GEOM_OCC)
|
||
FillCloseSurface( md[i] );
|
||
CloseOpenQuads( md[i] );
|
||
MeshDomain(md[i]);
|
||
}, md.Size());
|
||
}
|
||
catch(...)
|
||
{
|
||
MergeMeshes(mesh3d, md);
|
||
return MESHING3_GIVEUP;
|
||
}
|
||
|
||
MergeMeshes(mesh3d, md);
|
||
|
||
MeshQuality3d (mesh3d);
|
||
|
||
return MESHING3_OK;
|
||
}
|
||
|
||
|
||
MESHING3_RESULT OptimizeVolume (const MeshingParameters & mp,
|
||
Mesh & mesh3d)
|
||
// const CSGeometry * geometry)
|
||
{
|
||
static Timer t("OptimizeVolume"); RegionTimer reg(t);
|
||
RegionTaskManager rtm(mp.parallel_meshing ? mp.nthreads : 0);
|
||
const char* savetask = multithread.task;
|
||
multithread.task = "Optimize Volume";
|
||
|
||
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 (auto i : Range(mp.optsteps3d))
|
||
{
|
||
if (multithread.terminate)
|
||
break;
|
||
|
||
MeshOptimize3d optmesh(mp);
|
||
|
||
// teterrpow = mp.opterrpow;
|
||
// for (size_t j = 1; j <= strlen(mp.optimize3d); j++)
|
||
for (auto j : Range(mp.optimize3d.size()))
|
||
{
|
||
multithread.percent = 100.* (double(j)/mp.optimize3d.size() + i)/mp.optsteps3d;
|
||
if (multithread.terminate)
|
||
break;
|
||
|
||
switch (mp.optimize3d[j])
|
||
{
|
||
case 'c': optmesh.CombineImprove(mesh3d, OPT_REST); break;
|
||
case 'd': optmesh.SplitImprove(mesh3d); break;
|
||
case 'D': optmesh.SplitImprove2(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);
|
||
}
|
||
|
||
multithread.task = savetask;
|
||
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");
|
||
}
|
||
}
|