mirror of
https://github.com/NGSolve/netgen.git
synced 2024-12-24 21:10:33 +05:00
890 lines
25 KiB
C++
890 lines
25 KiB
C++
#include <mystdlib.h>
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#include "meshing.hpp"
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#include <opti.hpp>
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namespace netgen
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{
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class trionedge
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{
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public:
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SurfaceElementIndex tnr;
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int sidenr;
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trionedge () { tnr = 0; sidenr = 0; }
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trionedge (SurfaceElementIndex atnr, int asidenr)
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{ tnr = atnr; sidenr = asidenr; }
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};
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bool MeshOptimize2d :: EdgeSwapping (const int usemetric,
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Array<Neighbour> &neighbors,
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Array<bool> &swapped,
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const SurfaceElementIndex t1, const int o1,
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const int t,
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Array<int,PointIndex> &pdef,
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const bool check_only)
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{
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bool should;
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bool do_swap = false;
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SurfaceElementIndex t2 = neighbors[t1].GetNr (o1);
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int o2 = neighbors[t1].GetOrientation (o1);
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if (t2 == -1) return false;
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if (swapped[t1] || swapped[t2]) return false;
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const int faceindex = mesh[t1].GetIndex();
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const int surfnr = mesh.GetFaceDescriptor (faceindex).SurfNr();
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PointIndex pi1 = mesh[t1].PNumMod(o1+1+1);
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PointIndex pi2 = mesh[t1].PNumMod(o1+1+2);
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PointIndex pi3 = mesh[t1].PNumMod(o1+1);
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PointIndex pi4 = mesh[t2].PNumMod(o2+1);
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PointGeomInfo gi1 = mesh[t1].GeomInfoPiMod(o1+1+1);
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PointGeomInfo gi2 = mesh[t1].GeomInfoPiMod(o1+1+2);
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PointGeomInfo gi3 = mesh[t1].GeomInfoPiMod(o1+1);
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PointGeomInfo gi4 = mesh[t2].GeomInfoPiMod(o2+1);
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bool allowswap = true;
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Vec<3> auxvec1 = mesh[pi3]-mesh[pi4];
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Vec<3> auxvec2 = mesh[pi1]-mesh[pi4];
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allowswap = allowswap && fabs(1.-(auxvec1*auxvec2)/(auxvec1.Length()*auxvec2.Length())) > 1e-4;
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if(!allowswap)
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return false;
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// normal of new
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Vec<3> nv1 = Cross (auxvec1, auxvec2);
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auxvec1 = mesh.Point(pi4)-mesh.Point(pi3);
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auxvec2 = mesh.Point(pi2)-mesh.Point(pi3);
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allowswap = allowswap && fabs(1.-(auxvec1*auxvec2)/(auxvec1.Length()*auxvec2.Length())) > 1e-4;
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if(!allowswap)
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return false;
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Vec<3> nv2 = Cross (auxvec1, auxvec2);
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// normals of original
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Vec<3> nv3 = Cross (mesh[pi1]-mesh[pi4], mesh[pi2]-mesh[pi4]);
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Vec<3> nv4 = Cross (mesh[pi2]-mesh[pi3], mesh[pi1]-mesh[pi3]);
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nv3 *= -1;
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nv4 *= -1;
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nv3.Normalize();
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nv4.Normalize();
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nv1.Normalize();
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nv2.Normalize();
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auto nvp3 = geo.GetNormal (surfnr, mesh.Point(pi3), &gi3);
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nvp3.Normalize();
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auto nvp4 = geo.GetNormal (surfnr, mesh.Point(pi4), &gi4);
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nvp4.Normalize();
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double critval = cos (M_PI / 6); // 30 degree
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allowswap = allowswap &&
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(nv1 * nvp3 > critval) &&
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(nv1 * nvp4 > critval) &&
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(nv2 * nvp3 > critval) &&
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(nv2 * nvp4 > critval) &&
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(nvp3 * nv3 > critval) &&
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(nvp4 * nv4 > critval);
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double horder = Dist (mesh[pi1], mesh[pi2]);
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if ( // nv1 * nv2 >= 0 &&
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nv1.Length() > 1e-3 * horder * horder &&
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nv2.Length() > 1e-3 * horder * horder &&
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allowswap )
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{
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if (!usemetric)
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{
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int e = pdef[pi1] + pdef[pi2] - pdef[pi3] - pdef[pi4];
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double d =
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Dist2 (mesh[pi1], mesh[pi2]) -
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Dist2 (mesh[pi3], mesh[pi4]);
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should = e >= t && (e > 2 || d > 0);
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}
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else
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{
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double loch = mesh.GetH(mesh[pi1]);
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should =
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CalcTriangleBadness (mesh[pi4], mesh[pi3], mesh[pi1], metricweight, loch) +
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CalcTriangleBadness (mesh[pi3], mesh[pi4], mesh[pi2], metricweight, loch) <
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CalcTriangleBadness (mesh[pi1], mesh[pi2], mesh[pi3], metricweight, loch) +
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CalcTriangleBadness (mesh[pi2], mesh[pi1], mesh[pi4], metricweight, loch);
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}
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if (allowswap)
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{
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Element2d sw1 (pi4, pi3, pi1);
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Element2d sw2 (pi3, pi4, pi2);
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int legal1 =
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mesh.LegalTrig (mesh[t1]) +
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mesh.LegalTrig (mesh[t2]);
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int legal2 =
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mesh.LegalTrig (sw1) + mesh.LegalTrig (sw2);
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if (legal1 < legal2) should = true;
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if (legal2 < legal1) should = false;
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}
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do_swap = should;
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if (should && !check_only)
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{
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// do swapping !
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mesh[t1] = { { pi1, gi1 }, { pi4, gi4 }, { pi3, gi3 } };
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mesh[t2] = { { pi2, gi2 }, { pi3, gi3 }, { pi4, gi4 } };
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pdef[pi1]--;
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pdef[pi2]--;
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pdef[pi3]++;
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pdef[pi4]++;
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swapped[t1] = true;
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swapped[t2] = true;
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}
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}
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return do_swap;
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}
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void MeshOptimize2d :: EdgeSwapping (int usemetric)
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{
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static Timer timer("EdgeSwapping (2D)"); RegionTimer reg(timer);
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static Timer timer_nb("EdgeSwapping-Find neighbors");
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if (usemetric)
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PrintMessage (3, "Edgeswapping, metric");
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else
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PrintMessage (3, "Edgeswapping, topological");
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static Timer timerstart("EdgeSwapping 2D start");
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timerstart.Start();
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Array<SurfaceElementIndex> seia;
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bool mixed = false;
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if(faceindex==0)
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{
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seia.SetSize(mesh.GetNSE());
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ParallelFor( Range(seia), [&] (auto i) NETGEN_LAMBDA_INLINE
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{
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SurfaceElementIndex sei(i);
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seia[i] = sei;
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if (mesh[sei].GetNP() != 3)
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{
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const auto & sel = mesh[sei];
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for(auto i : Range(sel.GetNP()))
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if(mesh[sel[i]].Type() == INNERPOINT)
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mixed = true;
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}
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});
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}
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else
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{
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mesh.GetSurfaceElementsOfFace (faceindex, seia);
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for (SurfaceElementIndex sei : seia)
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if (mesh[sei].GetNP() != 3)
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mixed = true;
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}
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if(mixed)
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return GenericImprove();
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Array<Neighbour> neighbors(mesh.GetNSE());
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auto elements_on_node = mesh.CreatePoint2SurfaceElementTable(faceindex);
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Array<bool> swapped(mesh.GetNSE());
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Array<int,PointIndex> pdef(mesh.GetNP());
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Array<double,PointIndex> pangle(mesh.GetNP());
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static const double minangle[] = { 0, 1.481, 2.565, 3.627, 4.683, 5.736, 7, 9 };
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if(faceindex == 0)
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{
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ParallelFor( Range(pangle), [&] (auto i) NETGEN_LAMBDA_INLINE
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{
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pangle[i] = 0.0;
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});
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}
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else
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{
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ParallelFor( Range(seia), [&] (auto i) NETGEN_LAMBDA_INLINE
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{
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const Element2d & sel = mesh[seia[i]];
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for (int j = 0; j < 3; j++)
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pangle[sel[j]] = 0.0;
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});
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}
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ParallelFor( Range(seia), [&] (auto i) NETGEN_LAMBDA_INLINE
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{
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const Element2d & sel = mesh[seia[i]];
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for (int j = 0; j < 3; j++)
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{
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POINTTYPE typ = mesh[sel[j]].Type();
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if (typ == FIXEDPOINT || typ == EDGEPOINT)
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{
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AtomicAdd(pangle[sel[j]],
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Angle (mesh[sel[(j+1)%3]] - mesh[sel[j]],
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mesh[sel[(j+2)%3]] - mesh[sel[j]]));
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}
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}
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});
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ParallelFor( Range(seia), [&] (auto i) NETGEN_LAMBDA_INLINE
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{
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const Element2d & sel = mesh[seia[i]];
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for (int j = 0; j < 3; j++)
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{
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PointIndex pi = sel[j];
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if (mesh[pi].Type() == INNERPOINT || mesh[pi].Type() == SURFACEPOINT)
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pdef[pi] = -6;
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else
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for (int j = 0; j < 8; j++)
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if (pangle[pi] >= minangle[j])
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pdef[pi] = -1-j;
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}
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});
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ParallelFor( Range(seia), [this, &pdef, &neighbors, &seia, &elements_on_node] (auto i) NETGEN_LAMBDA_INLINE
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{
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auto sei = seia[i];
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for (PointIndex pi : mesh[sei].template PNums<3>())
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AsAtomic(pdef[pi])++;
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for (int j = 0; j < 3; j++)
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{
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neighbors[sei].SetNr (j, -1);
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neighbors[sei].SetOrientation (j, 0);
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}
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const auto sel = mesh[sei];
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for (int j = 0; j < 3; j++)
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{
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PointIndex pi1 = sel.PNumMod(j+2);
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PointIndex pi2 = sel.PNumMod(j+3);
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for (auto sei_other : elements_on_node[pi1])
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{
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if(sei_other==sei) continue;
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const auto & other = mesh[sei_other];
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int pi1_other = -1;
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int pi2_other = -1;
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bool common_edge = false;
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for (int k = 0; k < 3; k++)
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{
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if(other[k] == pi1)
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pi1_other = k;
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if(other[k] == pi2)
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{
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pi2_other = k;
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common_edge = true;
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}
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}
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if(common_edge)
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{
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neighbors[sei].SetNr (j, sei_other);
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neighbors[sei].SetOrientation (j, 3-pi1_other-pi2_other);
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}
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}
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}
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});
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for (SurfaceElementIndex sei : seia)
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swapped[sei] = false;
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timerstart.Stop();
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Array<std::pair<SurfaceElementIndex,int>> improvement_candidates(3*seia.Size());
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atomic<int> cnt(0);
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int t = 4;
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bool done = false;
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while (!done && t >= 2)
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{
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cnt = 0;
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ParallelFor( Range(seia), [&] (auto i) NETGEN_LAMBDA_INLINE
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{
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SurfaceElementIndex t1 = seia[i];
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if (mesh[t1].IsDeleted())
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return;
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if (mesh[t1].GetIndex() != faceindex)
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return;
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if (multithread.terminate)
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throw NgException ("Meshing stopped");
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for (int o1 = 0; o1 < 3; o1++)
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if(EdgeSwapping(usemetric, neighbors, swapped, t1, o1, t, pdef, true))
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improvement_candidates[cnt++]= std::make_pair(t1,o1);
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});
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auto elements_with_improvement = improvement_candidates.Range(cnt.load());
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QuickSort(elements_with_improvement);
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for (auto [t1,o1] : elements_with_improvement)
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done |= EdgeSwapping(usemetric, neighbors, swapped, t1, o1, t, pdef, false);
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t--;
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}
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mesh.SetNextTimeStamp();
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}
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double CombineImproveEdge( Mesh & mesh,
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const Table<SurfaceElementIndex, PointIndex> & elementsonnode,
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Array<Vec<3>, PointIndex> & normals,
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Array<bool, PointIndex> & fixed,
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PointIndex pi1, PointIndex pi2,
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bool check_only = true)
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{
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Vec<3> nv;
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ArrayMem<SurfaceElementIndex, 20> hasonepi, hasbothpi;
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if (!pi1.IsValid() || !pi2.IsValid())
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return 0.0;
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bool debugflag = 0;
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if (debugflag)
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{
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(*testout) << "Combineimprove "
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<< "pi1 = " << pi1 << " pi2 = " << pi2 << endl;
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}
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/*
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// save version:
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if (fixed.Get(pi1) || fixed.Get(pi2))
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return 0.0;
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if (pi2 < pi1) swap (pi1, pi2);
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*/
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// more general
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if (fixed[pi2])
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Swap (pi1, pi2);
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if (fixed[pi2])
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return 0.0;
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double loch = mesh.GetH (mesh[pi1]);
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int faceindex = -1;
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for (SurfaceElementIndex sei2 : elementsonnode[pi1])
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{
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const Element2d & el2 = mesh[sei2];
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if (el2.IsDeleted()) continue;
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if (el2[0] == pi2 || el2[1] == pi2 || el2[2] == pi2)
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{
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faceindex = el2.GetIndex();
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hasbothpi.Append (sei2);
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}
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}
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if(hasbothpi.Size()==0)
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return 0.0;
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nv = normals[pi2];
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for (SurfaceElementIndex sei2 : elementsonnode[pi2])
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{
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const Element2d & el2 = mesh[sei2];
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if (el2.IsDeleted()) continue;
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if (!el2.PNums<3>().Contains (pi1))
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hasonepi.Append (sei2);
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}
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double bad1 = 0;
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int illegal1 = 0, illegal2 = 0;
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/*
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for (SurfaceElementIndex sei : hasonepi)
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{
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const Element2d & el = mesh[sei];
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bad1 += CalcTriangleBadness (mesh[el[0]], mesh[el[1]], mesh[el[2]],
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nv, -1, loch);
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illegal1 += 1-mesh.LegalTrig(el);
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}
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*/
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for (const Element2d & el : mesh.SurfaceElements()[hasonepi])
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{
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bad1 += CalcTriangleBadness (mesh[el[0]], mesh[el[1]], mesh[el[2]],
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nv, -1, loch);
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illegal1 += 1-mesh.LegalTrig(el);
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}
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for (int k = 0; k < hasbothpi.Size(); k++)
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{
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const Element2d & el = mesh[hasbothpi[k]];
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bad1 += CalcTriangleBadness (mesh[el[0]], mesh[el[1]], mesh[el[2]],
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nv, -1, loch);
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illegal1 += 1-mesh.LegalTrig(el);
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}
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double bad2 = 0;
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for (int k = 0; k < hasonepi.Size(); k++)
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{
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Element2d el = mesh[hasonepi[k]];
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for (auto i : Range(3))
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if(el[i]==pi2)
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el[i] = pi1;
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double err =
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CalcTriangleBadness (mesh[el[0]], mesh[el[1]], mesh[el[2]],
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nv, -1, loch);
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bad2 += err;
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Vec<3> hnv = Cross (Vec3d (mesh[el[0]],
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mesh[el[1]]),
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Vec3d (mesh[el[0]],
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mesh[el[2]]));
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if (hnv * nv < 0)
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bad2 += 1e10;
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for (int l = 0; l < 3; l++)
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{
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auto normal = normals[el[l]];
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if(fixed[el[l]])
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{
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// point possibly on edge -> multiple normal vectors (for each surface), need to calculate it to be sure
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const int surfnr = mesh.GetFaceDescriptor (el.GetIndex()).SurfNr();
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normal = mesh.GetGeometry()->GetNormal (surfnr, mesh[el[l]], &el.GeomInfo()[l]);
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}
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if ( ( normal * nv) < 0.5)
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bad2 += 1e10;
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}
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illegal2 += 1-mesh.LegalTrig(el);
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}
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if (debugflag)
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{
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(*testout) << "bad1 = " << bad1 << ", bad2 = " << bad2 << endl;
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}
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bool should = (illegal2<=illegal1 && bad2 < bad1 && bad2 < 1e4);
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if(illegal2 < illegal1)
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{
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should = true;
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bad1 += 1e4;
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}
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double d_badness = should * (bad2-bad1);
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if(check_only)
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return d_badness;
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if (should)
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{
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/*
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(*testout) << "combine !" << endl;
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(*testout) << "bad1 = " << bad1 << ", bad2 = " << bad2 << endl;
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(*testout) << "illegal1 = " << illegal1 << ", illegal2 = " << illegal2 << endl;
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(*testout) << "loch = " << loch << endl;
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*/
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PointGeomInfo gi;
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// bool gi_set(false);
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/*
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Element2d *el1p(NULL);
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int l = 0;
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while(mesh[elementsonnode[pi1][l]].IsDeleted() && l<elementsonnode[pi1].Size()) l++;
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if(l<elementsonnode[pi1].Size())
|
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el1p = &mesh[elementsonnode[pi1][l]];
|
|
else
|
|
cerr << "OOPS!" << endl;
|
|
|
|
for (l = 0; l < el1p->GetNP(); l++)
|
|
if ((*el1p)[l] == pi1)
|
|
{
|
|
gi = el1p->GeomInfoPi (l+1);
|
|
// gi_set = true;
|
|
}
|
|
*/
|
|
for (SurfaceElementIndex sei : elementsonnode[pi1])
|
|
{
|
|
const Element2d & el1p = mesh[sei];
|
|
if (el1p.IsDeleted()) continue;
|
|
if(el1p.GetIndex() != faceindex) continue;
|
|
|
|
for (int l = 0; l < el1p.GetNP(); l++)
|
|
if (el1p[l] == pi1)
|
|
gi = el1p.GeomInfo()[l];
|
|
break;
|
|
}
|
|
|
|
|
|
// (*testout) << "Connect point " << pi2 << " to " << pi1 << "\n";
|
|
// for (int k = 0; k < elementsonnode[pi2].Size(); k++)
|
|
for (SurfaceElementIndex sei2 : elementsonnode[pi2])
|
|
{
|
|
Element2d & el = mesh[sei2];
|
|
if (el.IsDeleted()) continue;
|
|
if (el.PNums().Contains(pi1)) continue;
|
|
|
|
for (auto l : Range(el.GetNP()))
|
|
{
|
|
if (el[l] == pi2)
|
|
{
|
|
el[l] = pi1;
|
|
el.GeomInfo()[l] = gi;
|
|
}
|
|
|
|
fixed[el[l]] = true;
|
|
}
|
|
}
|
|
|
|
for (auto sei : hasbothpi)
|
|
mesh[sei].Delete();
|
|
|
|
}
|
|
return d_badness;
|
|
}
|
|
|
|
void MeshOptimize2d :: CombineImprove ()
|
|
{
|
|
SplitImprove();
|
|
PrintMessage (3, "Combine improve");
|
|
|
|
if (multithread.terminate)
|
|
throw NgException ("Meshing stopped");
|
|
|
|
static Timer timer ("Combineimprove 2D");
|
|
RegionTimer reg (timer);
|
|
|
|
static Timer timerstart ("Combineimprove 2D start");
|
|
timerstart.Start();
|
|
|
|
|
|
static Timer timerstart1 ("Combineimprove 2D start1");
|
|
timerstart1.Start();
|
|
|
|
|
|
Array<SurfaceElementIndex> seia;
|
|
|
|
if(faceindex)
|
|
mesh.GetSurfaceElementsOfFace (faceindex, seia);
|
|
else
|
|
{
|
|
seia.SetSize(mesh.GetNSE());
|
|
ParallelFor( IntRange(mesh.GetNSE()), [&seia] (auto i) NETGEN_LAMBDA_INLINE
|
|
{ seia[i] = i; });
|
|
}
|
|
|
|
bool mixed = false;
|
|
ParallelFor( Range(seia), [&] (auto i) NETGEN_LAMBDA_INLINE
|
|
{
|
|
if (mesh[seia[i]].GetNP() != 3)
|
|
mixed = true;
|
|
});
|
|
|
|
if(mixed)
|
|
return;
|
|
|
|
int np = mesh.GetNP();
|
|
|
|
auto elementsonnode = mesh.CreatePoint2SurfaceElementTable(faceindex);
|
|
|
|
int ntasks = ngcore::TaskManager::GetMaxThreads();
|
|
Array<std::tuple<PointIndex, PointIndex>> edges;
|
|
|
|
BuildEdgeList( mesh, elementsonnode, edges );
|
|
|
|
Array<bool,PointIndex> fixed(np);
|
|
ParallelFor( fixed.Range(), [&fixed] (auto i) NETGEN_LAMBDA_INLINE
|
|
{ fixed[i] = false; });
|
|
|
|
ParallelFor( edges.Range(), [&] (auto i) NETGEN_LAMBDA_INLINE
|
|
{
|
|
auto [pi0, pi1] = edges[i];
|
|
if (mesh.IsSegment (pi0, pi1))
|
|
{
|
|
fixed[pi0] = true;
|
|
fixed[pi1] = true;
|
|
}
|
|
});
|
|
|
|
timerstart1.Stop();
|
|
|
|
ParallelFor( mesh.LockedPoints().Range(), [&] (auto i) NETGEN_LAMBDA_INLINE
|
|
{
|
|
fixed[mesh.LockedPoints()[i]] = true;
|
|
});
|
|
|
|
|
|
Array<Vec<3>,PointIndex> normals(np);
|
|
|
|
ParallelFor( mesh.Points().Range(), [&] (auto pi) NETGEN_LAMBDA_INLINE
|
|
{
|
|
if (elementsonnode[pi].Size())
|
|
{
|
|
Element2d & hel = mesh[elementsonnode[pi][0]];
|
|
for (int k = 0; k < 3; k++)
|
|
if (hel[k] == pi)
|
|
{
|
|
const int faceindex = hel.GetIndex();
|
|
const int surfnr = mesh.GetFaceDescriptor (faceindex).SurfNr();
|
|
normals[pi] = geo.GetNormal (surfnr, mesh[pi], &hel.GeomInfoPi(k+1));
|
|
break;
|
|
}
|
|
}
|
|
}, TasksPerThread(4));
|
|
|
|
timerstart.Stop();
|
|
|
|
// Find edges with improvement
|
|
Array<std::tuple<double, int>> candidate_edges(edges.Size());
|
|
std::atomic<int> improvement_counter(0);
|
|
|
|
ParallelFor( Range(edges), [&] (auto i) NETGEN_LAMBDA_INLINE
|
|
{
|
|
auto [pi1, pi2] = edges[i];
|
|
double d_badness = CombineImproveEdge(mesh, elementsonnode, normals, fixed, pi1, pi2, true);
|
|
if(d_badness < 0.0)
|
|
candidate_edges[improvement_counter++] = make_tuple(d_badness, i);
|
|
}, TasksPerThread(4));
|
|
|
|
auto edges_with_improvement = candidate_edges.Part(0, improvement_counter.load());
|
|
QuickSort(edges_with_improvement);
|
|
|
|
for(auto [d_badness, ei] : edges_with_improvement)
|
|
{
|
|
auto [pi1, pi2] = edges[ei];
|
|
CombineImproveEdge(mesh, elementsonnode, normals, fixed, pi1, pi2, false);
|
|
}
|
|
|
|
// mesh.Compress();
|
|
mesh.SetNextTimeStamp();
|
|
}
|
|
|
|
void MeshOptimize2d :: SplitImprove()
|
|
{
|
|
if (!faceindex)
|
|
{
|
|
PrintMessage (3, "Split improve");
|
|
|
|
mesh.CalcSurfacesOfNode(); // TODO: needed?
|
|
for (faceindex = 1; faceindex <= mesh.GetNFD(); faceindex++)
|
|
{
|
|
SplitImprove();
|
|
|
|
if (multithread.terminate)
|
|
throw NgException ("Meshing stopped");
|
|
}
|
|
|
|
faceindex = 0;
|
|
mesh.Compress(); // TODO: needed?
|
|
return;
|
|
}
|
|
|
|
Array<SurfaceElementIndex> elements;
|
|
mesh.GetSurfaceElementsOfFace (faceindex, elements);
|
|
|
|
// return if we have quads in this surface
|
|
for (auto & ei : elements)
|
|
if (mesh[ei].GetNP() != 3)
|
|
return;
|
|
|
|
// maps from edges to adjacent trigs
|
|
INDEX_2_HASHTABLE<tuple<SurfaceElementIndex, SurfaceElementIndex>> els_on_edge(2*elements.Size() + 2);
|
|
|
|
// build els_on_edge table
|
|
for (SurfaceElementIndex sei : elements)
|
|
{
|
|
const Element2d & sel = mesh[sei];
|
|
|
|
for (int j = 0; j < 3; j++)
|
|
{
|
|
PointIndex pi1 = sel.PNumMod(j+2);
|
|
PointIndex pi2 = sel.PNumMod(j+3);
|
|
|
|
if (mesh.IsSegment (pi1, pi2)) continue;
|
|
|
|
INDEX_2 ii2 (pi1, pi2);
|
|
ii2.Sort();
|
|
if (els_on_edge.Used (ii2))
|
|
{
|
|
auto els = els_on_edge.Get(ii2);
|
|
get<1>(els) = sei;
|
|
els_on_edge.Set(ii2, els);
|
|
}
|
|
else
|
|
{
|
|
els_on_edge.Set (ii2, make_tuple(sei, sei));
|
|
}
|
|
}
|
|
}
|
|
|
|
// split edges of illegal trigs
|
|
for (SurfaceElementIndex sei : elements)
|
|
{
|
|
Element2d & sel = mesh[sei];
|
|
|
|
if (sel.IsDeleted()) continue;
|
|
|
|
// TODO: split also bad trigs, nut just illegal ones
|
|
if (mesh.LegalTrig(sel)) continue;
|
|
|
|
// find longest edge
|
|
INDEX_2 edge;
|
|
double edge_len = 0;
|
|
PointIndex pi1, pi2, pi3, pi4;
|
|
PointGeomInfo gi1, gi2, gi3, gi4;
|
|
for(auto j : Range(1,4))
|
|
{
|
|
auto test_pi1 = sel.PNumMod(j);
|
|
auto test_pi2 = sel.PNumMod(j+1);
|
|
if (mesh.IsSegment(test_pi1, test_pi2))
|
|
continue;
|
|
auto len = (mesh[test_pi2]-mesh[test_pi1]).Length();
|
|
if(len > edge_len)
|
|
{
|
|
edge = {test_pi1, test_pi2};
|
|
edge.Sort();
|
|
edge_len = len;
|
|
pi1 = test_pi1;
|
|
pi2 = test_pi2;
|
|
pi3 = sel.PNumMod(j+2);
|
|
gi1 = sel.GeomInfoPiMod(j);
|
|
gi2 = sel.GeomInfoPiMod(j+1);
|
|
gi3 = sel.GeomInfoPiMod(j+2);
|
|
}
|
|
}
|
|
if(!edge_len)
|
|
throw Exception("Couldn't find edge to split, something is wrong");
|
|
// get neighbor element
|
|
auto els = els_on_edge.Get(edge);
|
|
SurfaceElementIndex other_i = get<0>(els);
|
|
if(other_i==sei) other_i = get<1>(els);
|
|
auto & other = mesh[other_i];
|
|
|
|
// find opposite point of neighbor element
|
|
for (int j = 0; j < 3; j++)
|
|
if(other[j]!=pi1 && other[j]!=pi2)
|
|
{
|
|
pi4 = other[j];
|
|
gi4 = other.GeomInfoPi(j);
|
|
break;
|
|
}
|
|
|
|
// split edge pi1,pi2
|
|
Point<3> p5;
|
|
PointIndex pi5;
|
|
PointGeomInfo gi5;
|
|
|
|
geo.PointBetween(mesh[pi1], mesh[pi2], 0.5,
|
|
faceindex,
|
|
gi1, gi2, p5, gi5);
|
|
|
|
pi5 = mesh.AddPoint(p5);
|
|
|
|
Element2d e1(3);
|
|
e1.SetIndex(faceindex);
|
|
e1={ {pi1,gi1}, {pi5,gi5}, {pi3,gi3} };
|
|
mesh.AddSurfaceElement( e1 );
|
|
|
|
Element2d e2(3);
|
|
e2.SetIndex(faceindex);
|
|
e2 ={ {pi5,gi5}, {pi2,gi2}, {pi3,gi3} };
|
|
mesh.AddSurfaceElement( e2 );
|
|
|
|
Element2d e3(3);
|
|
e3.SetIndex(faceindex);
|
|
e3 ={ {pi1,gi1}, {pi4,gi4}, {pi5,gi5} };
|
|
mesh.AddSurfaceElement( e3 );
|
|
|
|
Element2d e4(3);
|
|
e4.SetIndex(faceindex);
|
|
e4 ={ {pi4,gi4}, {pi2,gi2}, {pi5,gi5} };
|
|
mesh.AddSurfaceElement( e4 );
|
|
|
|
sel.Delete();
|
|
other.Delete();
|
|
}
|
|
|
|
mesh.SetNextTimeStamp();
|
|
}
|
|
|
|
void MeshOptimize2d :: CheckMeshApproximation (Mesh & mesh)
|
|
{
|
|
// Check angles between elements and normals at corners
|
|
/*
|
|
|
|
int i, j;
|
|
int ne = mesh.GetNSE();
|
|
int surfnr;
|
|
|
|
Vec3d n, ng;
|
|
NgArray<Vec3d> ngs(3);
|
|
|
|
(*mycout) << "Check Surface Approximation" << endl;
|
|
(*testout) << "Check Surface Approximation" << endl;
|
|
|
|
for (i = 1; i <= ne; i++)
|
|
{
|
|
const Element2d & el = mesh.SurfaceElement(i);
|
|
surfnr = mesh.GetFaceDescriptor (el.GetIndex()).SurfNr();
|
|
Vec3d n = Cross (mesh.Point (el.PNum(1)) - mesh.Point (el.PNum(2)),
|
|
mesh.Point (el.PNum(1)) - mesh.Point (el.PNum(3)));
|
|
n /= n.Length();
|
|
|
|
for (j = 1; j <= el.GetNP(); j++)
|
|
{
|
|
SelectSurfaceOfPoint (mesh.Point(el.PNum(j)), el.GeomInfoPi(j));
|
|
GetNormalVector (surfnr, mesh.Point(el.PNum(j)), ng);
|
|
ng /= ng.Length();
|
|
ngs.Elem(j) = ng;
|
|
|
|
double angle = (180.0 / M_PI) * Angle (n, ng);
|
|
if (angle > 60)
|
|
{
|
|
(*testout) << "el " << i << " node " << el.PNum(j)
|
|
<< "has angle = " << angle << endl;
|
|
}
|
|
}
|
|
|
|
for (j = 1; j <= 3; j++)
|
|
{
|
|
double angle = (180.0 / M_PI) * Angle (ngs.Get(j), ngs.Get(j%3+1));
|
|
if (angle > 60)
|
|
{
|
|
(*testout) << "el " << i << " node-node "
|
|
<< ngs.Get(j) << " - " << ngs.Get(j%3+1)
|
|
<< " has angle = " << angle << endl;
|
|
}
|
|
}
|
|
}
|
|
*/
|
|
}
|
|
}
|