mirror of
https://github.com/NGSolve/netgen.git
synced 2024-09-23 02:02:49 +05:00
899 lines
23 KiB
C++
899 lines
23 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 (Mesh & mesh, 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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Vec<3> nvp3, nvp4;
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GetNormalVector (surfnr, mesh.Point(pi3), gi3, nvp3);
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nvp3.Normalize();
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GetNormalVector (surfnr, mesh.Point(pi4), gi4, nvp4);
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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 (Mesh & mesh, 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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mixed = true;
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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(mesh);
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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), [&pdef, &neighbors, &mesh, &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(mesh, 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(mesh, 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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void MeshOptimize2d :: CombineImprove (Mesh & mesh)
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{
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if (!faceindex)
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{
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SplitImprove(mesh);
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PrintMessage (3, "Combine improve");
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for (faceindex = 1; faceindex <= mesh.GetNFD(); faceindex++)
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{
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CombineImprove (mesh);
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if (multithread.terminate)
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throw NgException ("Meshing stopped");
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}
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faceindex = 0;
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return;
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}
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static Timer timer ("Combineimprove 2D");
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RegionTimer reg (timer);
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static Timer timerstart ("Combineimprove 2D start");
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timerstart.Start();
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static Timer timerstart1 ("Combineimprove 2D start1");
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timerstart1.Start();
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Array<SurfaceElementIndex> seia;
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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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return;
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int surfnr = 0;
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if (faceindex)
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surfnr = mesh.GetFaceDescriptor (faceindex).SurfNr();
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Vec<3> nv;
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int np = mesh.GetNP();
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auto elementsonnode = mesh.CreatePoint2SurfaceElementTable(faceindex);
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Array<SurfaceElementIndex> hasonepi, hasbothpi;
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Array<bool,PointIndex> fixed(np);
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ParallelFor( fixed.Range(), [&fixed] (auto i) NETGEN_LAMBDA_INLINE
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{ fixed[i] = false; });
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timerstart1.Stop();
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/*
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for (SegmentIndex si = 0; si < mesh.GetNSeg(); si++)
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{
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INDEX_2 i2(mesh[si][0], mesh[si][1]);
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fixed[i2.I1()] = true;
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fixed[i2.I2()] = true;
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}
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*/
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for (SurfaceElementIndex sei : seia)
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{
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Element2d & sel = mesh[sei];
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for (int j = 0; j < sel.GetNP(); 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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if (mesh.IsSegment (pi1, pi2))
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{
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fixed[pi1] = true;
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fixed[pi2] = true;
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}
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}
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}
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/*
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for(int i = 0; i < mesh.LockedPoints().Size(); i++)
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fixed[mesh.LockedPoints()[i]] = true;
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*/
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for (PointIndex pi : mesh.LockedPoints())
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fixed[pi] = true;
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Array<Vec<3>,PointIndex> normals(np);
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// for (PointIndex pi = mesh.Points().Begin(); pi < mesh.Points().End(); pi++)
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for (PointIndex pi : mesh.Points().Range())
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{
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if (elementsonnode[pi].Size())
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{
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Element2d & hel = mesh[elementsonnode[pi][0]];
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for (int k = 0; k < 3; k++)
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if (hel[k] == pi)
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{
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GetNormalVector (surfnr, mesh[pi], hel.GeomInfoPi(k+1), normals[pi]);
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break;
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}
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}
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}
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timerstart.Stop();
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for (int i = 0; i < seia.Size(); i++)
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{
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SurfaceElementIndex sei = seia[i];
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Element2d & elem = mesh[sei];
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for (int j = 0; j < 3; j++)
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{
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if (elem.IsDeleted()) continue;
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PointIndex pi1 = elem[j];
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PointIndex pi2 = elem[(j+1) % 3];
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/*
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if (pi1 < PointIndex::BASE ||
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pi2 < PointIndex::BASE)
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continue;
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*/
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if (!pi1.IsValid() || !pi2.IsValid())
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continue;
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/*
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INDEX_2 i2(pi1, pi2);
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i2.Sort();
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if (segmentht.Used(i2))
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continue;
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*/
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bool debugflag = 0;
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if (debugflag)
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{
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(*testout) << "Combineimprove, face = " << faceindex
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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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continue;
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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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continue;
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double loch = mesh.GetH (mesh[pi1]);
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// INDEX_2 si2 (pi1, pi2);
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// si2.Sort();
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/*
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if (edgetested.Used (si2))
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continue;
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edgetested.Set (si2, 1);
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*/
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hasonepi.SetSize(0);
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hasbothpi.SetSize(0);
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// for (int k = 0; k < elementsonnode[pi1].Size(); k++)
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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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hasbothpi.Append (sei2);
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nv = Cross (Vec3d (mesh[el2[0]], mesh[el2[1]]),
|
|
Vec3d (mesh[el2[0]], mesh[el2[2]]));
|
|
}
|
|
else
|
|
{
|
|
hasonepi.Append (sei2);
|
|
}
|
|
}
|
|
|
|
|
|
Element2d & hel = mesh[hasbothpi[0]];
|
|
for (int k = 0; k < 3; k++)
|
|
if (hel[k] == pi1)
|
|
{
|
|
GetNormalVector (surfnr, mesh[pi1], hel.GeomInfoPi(k+1), nv);
|
|
break;
|
|
}
|
|
|
|
// nv = normals.Get(pi1);
|
|
|
|
|
|
for (SurfaceElementIndex sei2 : elementsonnode[pi2])
|
|
{
|
|
const Element2d & el2 = mesh[sei2];
|
|
if (el2.IsDeleted()) continue;
|
|
if (!el2.PNums<3>().Contains (pi1))
|
|
hasonepi.Append (sei2);
|
|
}
|
|
|
|
double bad1 = 0;
|
|
int illegal1 = 0, illegal2 = 0;
|
|
/*
|
|
for (SurfaceElementIndex sei : hasonepi)
|
|
{
|
|
const Element2d & el = mesh[sei];
|
|
bad1 += CalcTriangleBadness (mesh[el[0]], mesh[el[1]], mesh[el[2]],
|
|
nv, -1, loch);
|
|
illegal1 += 1-mesh.LegalTrig(el);
|
|
}
|
|
*/
|
|
for (const Element2d & el : mesh.SurfaceElements()[hasonepi])
|
|
{
|
|
bad1 += CalcTriangleBadness (mesh[el[0]], mesh[el[1]], mesh[el[2]],
|
|
nv, -1, loch);
|
|
illegal1 += 1-mesh.LegalTrig(el);
|
|
}
|
|
|
|
for (int k = 0; k < hasbothpi.Size(); k++)
|
|
{
|
|
const Element2d & el = mesh[hasbothpi[k]];
|
|
bad1 += CalcTriangleBadness (mesh[el[0]], mesh[el[1]], mesh[el[2]],
|
|
nv, -1, loch);
|
|
illegal1 += 1-mesh.LegalTrig(el);
|
|
}
|
|
bad1 /= (hasonepi.Size()+hasbothpi.Size());
|
|
|
|
double bad2 = 0;
|
|
for (int k = 0; k < hasonepi.Size(); k++)
|
|
{
|
|
Element2d el = mesh[hasonepi[k]];
|
|
for (auto i : Range(3))
|
|
if(el[i]==pi2)
|
|
el[i] = pi1;
|
|
|
|
double err =
|
|
CalcTriangleBadness (mesh[el[0]], mesh[el[1]], mesh[el[2]],
|
|
nv, -1, loch);
|
|
bad2 += err;
|
|
|
|
Vec<3> hnv = Cross (Vec3d (mesh[el[0]],
|
|
mesh[el[1]]),
|
|
Vec3d (mesh[el[0]],
|
|
mesh[el[2]]));
|
|
if (hnv * nv < 0)
|
|
bad2 += 1e10;
|
|
|
|
for (int l = 0; l < 3; l++)
|
|
if ( (normals[el[l]] * nv) < 0.5)
|
|
bad2 += 1e10;
|
|
|
|
illegal2 += 1-mesh.LegalTrig(el);
|
|
}
|
|
bad2 /= hasonepi.Size();
|
|
|
|
if (debugflag)
|
|
{
|
|
(*testout) << "bad1 = " << bad1 << ", bad2 = " << bad2 << endl;
|
|
}
|
|
|
|
bool should = (bad2 < bad1 && bad2 < 1e4);
|
|
if (bad2 < 1e4)
|
|
{
|
|
if (illegal1 > illegal2) should = true;
|
|
if (illegal2 > illegal1) should = false;
|
|
}
|
|
|
|
|
|
if (should)
|
|
{
|
|
/*
|
|
(*testout) << "combine !" << endl;
|
|
(*testout) << "bad1 = " << bad1 << ", bad2 = " << bad2 << endl;
|
|
(*testout) << "illegal1 = " << illegal1 << ", illegal2 = " << illegal2 << endl;
|
|
(*testout) << "loch = " << loch << endl;
|
|
*/
|
|
|
|
PointGeomInfo gi;
|
|
// bool gi_set(false);
|
|
|
|
/*
|
|
Element2d *el1p(NULL);
|
|
int l = 0;
|
|
while(mesh[elementsonnode[pi1][l]].IsDeleted() && l<elementsonnode[pi1].Size()) l++;
|
|
if(l<elementsonnode[pi1].Size())
|
|
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;
|
|
|
|
for (int l = 0; l < el1p.GetNP(); l++)
|
|
if (el1p[l] == pi1)
|
|
// gi = el1p.GeomInfoPi (l+1);
|
|
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();
|
|
}
|
|
}
|
|
}
|
|
|
|
// mesh.Compress();
|
|
mesh.SetNextTimeStamp();
|
|
}
|
|
|
|
void MeshOptimize2d :: SplitImprove (Mesh & mesh)
|
|
{
|
|
if (!faceindex)
|
|
{
|
|
PrintMessage (3, "Split improve");
|
|
|
|
mesh.CalcSurfacesOfNode(); // TODO: needed?
|
|
for (faceindex = 1; faceindex <= mesh.GetNFD(); faceindex++)
|
|
{
|
|
SplitImprove (mesh);
|
|
|
|
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;
|
|
|
|
for (int j = 0; j < 3; j++)
|
|
{
|
|
PointIndex pi1 = sel.PNumMod(j+2);
|
|
PointIndex pi2 = sel.PNumMod(j+3);
|
|
PointIndex pi3 = sel.PNumMod(j+1);
|
|
PointIndex pi4;
|
|
PointGeomInfo gi1 = sel.GeomInfoPiMod(j+2);
|
|
PointGeomInfo gi2 = sel.GeomInfoPiMod(j+3);
|
|
PointGeomInfo gi3 = sel.GeomInfoPiMod(j+1);
|
|
PointGeomInfo gi4;
|
|
|
|
if (mesh.IsSegment (pi1, pi2)) continue;
|
|
|
|
// get neighbor element
|
|
INDEX_2 ii2 (pi1, pi2);
|
|
ii2.Sort();
|
|
auto els = els_on_edge.Get(ii2);
|
|
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;
|
|
|
|
mesh.GetGeometry()->GetRefinement().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;
|
|
}
|
|
}
|
|
}
|
|
*/
|
|
}
|
|
}
|