Restructure MeshOptimize2d::EdgeSwapping()

This commit is contained in:
Matthias Hochsteger 2019-10-08 17:03:49 +02:00
parent c6db690269
commit 4d218fa042
2 changed files with 163 additions and 163 deletions

View File

@ -7,20 +7,6 @@
namespace netgen namespace netgen
{ {
class Neighbour
{
int nr[3];
int orient[3];
public:
Neighbour () { ; }
void SetNr (int side, int anr) { nr[side] = anr; }
int GetNr (int side) { return nr[side]; }
void SetOrientation (int side, int aorient) { orient[side] = aorient; }
int GetOrientation (int side) { return orient[side]; }
};
@ -37,6 +23,152 @@ namespace netgen
}; };
bool MeshOptimize2d :: EdgeSwapping (Mesh & mesh, const int usemetric,
Array<Neighbour> &neighbors,
Array<bool> &swapped,
const SurfaceElementIndex t1, const int o1,
const int surfnr,
const int t,
NgArray<int,PointIndex::BASE> &pdef,
const bool check_only)
{
bool should;
bool do_swap = false;
SurfaceElementIndex t2 = neighbors[t1].GetNr (o1);
int o2 = neighbors[t1].GetOrientation (o1);
if (t2 == -1) return false;
if (swapped[t1] || swapped[t2]) return false;
PointIndex pi1 = mesh[t1].PNumMod(o1+1+1);
PointIndex pi2 = mesh[t1].PNumMod(o1+1+2);
PointIndex pi3 = mesh[t1].PNumMod(o1+1);
PointIndex pi4 = mesh[t2].PNumMod(o2+1);
PointGeomInfo gi1 = mesh[t1].GeomInfoPiMod(o1+1+1);
PointGeomInfo gi2 = mesh[t1].GeomInfoPiMod(o1+1+2);
PointGeomInfo gi3 = mesh[t1].GeomInfoPiMod(o1+1);
PointGeomInfo gi4 = mesh[t2].GeomInfoPiMod(o2+1);
bool allowswap = true;
Vec<3> auxvec1 = mesh[pi3]-mesh[pi4];
Vec<3> auxvec2 = mesh[pi1]-mesh[pi4];
allowswap = allowswap && fabs(1.-(auxvec1*auxvec2)/(auxvec1.Length()*auxvec2.Length())) > 1e-4;
if(!allowswap)
return false;
// normal of new
Vec<3> nv1 = Cross (auxvec1, auxvec2);
auxvec1 = mesh.Point(pi4)-mesh.Point(pi3);
auxvec2 = mesh.Point(pi2)-mesh.Point(pi3);
allowswap = allowswap && fabs(1.-(auxvec1*auxvec2)/(auxvec1.Length()*auxvec2.Length())) > 1e-4;
if(!allowswap)
return false;
Vec<3> nv2 = Cross (auxvec1, auxvec2);
// normals of original
Vec<3> nv3 = Cross (mesh[pi1]-mesh[pi4], mesh[pi2]-mesh[pi4]);
Vec<3> nv4 = Cross (mesh[pi2]-mesh[pi3], mesh[pi1]-mesh[pi3]);
nv3 *= -1;
nv4 *= -1;
nv3.Normalize();
nv4.Normalize();
nv1.Normalize();
nv2.Normalize();
Vec<3> nvp3, nvp4;
GetNormalVector (surfnr, mesh.Point(pi3), gi3, nvp3);
nvp3.Normalize();
GetNormalVector (surfnr, mesh.Point(pi4), gi4, nvp4);
nvp4.Normalize();
double critval = cos (M_PI / 6); // 30 degree
allowswap = allowswap &&
(nv1 * nvp3 > critval) &&
(nv1 * nvp4 > critval) &&
(nv2 * nvp3 > critval) &&
(nv2 * nvp4 > critval) &&
(nvp3 * nv3 > critval) &&
(nvp4 * nv4 > critval);
double horder = Dist (mesh[pi1], mesh[pi2]);
if ( // nv1 * nv2 >= 0 &&
nv1.Length() > 1e-3 * horder * horder &&
nv2.Length() > 1e-3 * horder * horder &&
allowswap )
{
if (!usemetric)
{
int e = pdef[pi1] + pdef[pi2] - pdef[pi3] - pdef[pi4];
double d =
Dist2 (mesh[pi1], mesh[pi2]) -
Dist2 (mesh[pi3], mesh[pi4]);
should = e >= t && (e > 2 || d > 0);
}
else
{
double loch = mesh.GetH(mesh[pi1]);
should =
CalcTriangleBadness (mesh[pi4], mesh[pi3], mesh[pi1], metricweight, loch) +
CalcTriangleBadness (mesh[pi3], mesh[pi4], mesh[pi2], metricweight, loch) <
CalcTriangleBadness (mesh[pi1], mesh[pi2], mesh[pi3], metricweight, loch) +
CalcTriangleBadness (mesh[pi2], mesh[pi1], mesh[pi4], metricweight, loch);
}
if (allowswap)
{
Element2d sw1 (pi4, pi3, pi1);
Element2d sw2 (pi3, pi4, pi2);
int legal1 =
mesh.LegalTrig (mesh[t1]) +
mesh.LegalTrig (mesh[t2]);
int legal2 =
mesh.LegalTrig (sw1) + mesh.LegalTrig (sw2);
if (legal1 < legal2) should = true;
if (legal2 < legal1) should = false;
}
do_swap = should;
if (should && !check_only)
{
// do swapping !
mesh[t1] = { { pi1, gi1 }, { pi4, gi4 }, { pi3, gi3 } };
mesh[t2] = { { pi2, gi2 }, { pi3, gi3 }, { pi4, gi4 } };
pdef[pi1]--;
pdef[pi2]--;
pdef[pi3]++;
pdef[pi4]++;
swapped[t1] = true;
swapped[t2] = true;
}
}
return do_swap;
}
void MeshOptimize2d :: EdgeSwapping (Mesh & mesh, int usemetric) void MeshOptimize2d :: EdgeSwapping (Mesh & mesh, int usemetric)
@ -261,155 +393,7 @@ namespace netgen
throw NgException ("Meshing stopped"); throw NgException ("Meshing stopped");
for (int o1 = 0; o1 < 3; o1++) for (int o1 = 0; o1 < 3; o1++)
{ done |= EdgeSwapping(mesh, usemetric, neighbors, swapped, t1, o1, surfnr, t, pdef, false);
bool should;
SurfaceElementIndex t2 = neighbors[t1].GetNr (o1);
int o2 = neighbors[t1].GetOrientation (o1);
if (t2 == -1) continue;
if (swapped[t1] || swapped[t2]) continue;
PointIndex pi1 = mesh[t1].PNumMod(o1+1+1);
PointIndex pi2 = mesh[t1].PNumMod(o1+1+2);
PointIndex pi3 = mesh[t1].PNumMod(o1+1);
PointIndex pi4 = mesh[t2].PNumMod(o2+1);
PointGeomInfo gi1 = mesh[t1].GeomInfoPiMod(o1+1+1);
PointGeomInfo gi2 = mesh[t1].GeomInfoPiMod(o1+1+2);
PointGeomInfo gi3 = mesh[t1].GeomInfoPiMod(o1+1);
PointGeomInfo gi4 = mesh[t2].GeomInfoPiMod(o2+1);
bool allowswap = true;
Vec<3> auxvec1 = mesh[pi3]-mesh[pi4];
Vec<3> auxvec2 = mesh[pi1]-mesh[pi4];
allowswap = allowswap && fabs(1.-(auxvec1*auxvec2)/(auxvec1.Length()*auxvec2.Length())) > 1e-4;
if(!allowswap)
continue;
// normal of new
Vec<3> nv1 = Cross (auxvec1, auxvec2);
auxvec1 = mesh.Point(pi4)-mesh.Point(pi3);
auxvec2 = mesh.Point(pi2)-mesh.Point(pi3);
allowswap = allowswap && fabs(1.-(auxvec1*auxvec2)/(auxvec1.Length()*auxvec2.Length())) > 1e-4;
if(!allowswap)
continue;
Vec<3> nv2 = Cross (auxvec1, auxvec2);
// normals of original
Vec<3> nv3 = Cross (mesh[pi1]-mesh[pi4], mesh[pi2]-mesh[pi4]);
Vec<3> nv4 = Cross (mesh[pi2]-mesh[pi3], mesh[pi1]-mesh[pi3]);
nv3 *= -1;
nv4 *= -1;
nv3.Normalize();
nv4.Normalize();
nv1.Normalize();
nv2.Normalize();
Vec<3> nvp3, nvp4;
GetNormalVector (surfnr, mesh.Point(pi3), gi3, nvp3);
nvp3.Normalize();
GetNormalVector (surfnr, mesh.Point(pi4), gi4, nvp4);
nvp4.Normalize();
double critval = cos (M_PI / 6); // 30 degree
allowswap = allowswap &&
(nv1 * nvp3 > critval) &&
(nv1 * nvp4 > critval) &&
(nv2 * nvp3 > critval) &&
(nv2 * nvp4 > critval) &&
(nvp3 * nv3 > critval) &&
(nvp4 * nv4 > critval);
double horder = Dist (mesh[pi1], mesh[pi2]);
if ( // nv1 * nv2 >= 0 &&
nv1.Length() > 1e-3 * horder * horder &&
nv2.Length() > 1e-3 * horder * horder &&
allowswap )
{
if (!usemetric)
{
int e = pdef[pi1] + pdef[pi2] - pdef[pi3] - pdef[pi4];
double d =
Dist2 (mesh[pi1], mesh[pi2]) -
Dist2 (mesh[pi3], mesh[pi4]);
should = e >= t && (e > 2 || d > 0);
}
else
{
double loch = mesh.GetH(mesh[pi1]);
should =
CalcTriangleBadness (mesh[pi4], mesh[pi3], mesh[pi1], metricweight, loch) +
CalcTriangleBadness (mesh[pi3], mesh[pi4], mesh[pi2], metricweight, loch) <
CalcTriangleBadness (mesh[pi1], mesh[pi2], mesh[pi3], metricweight, loch) +
CalcTriangleBadness (mesh[pi2], mesh[pi1], mesh[pi4], metricweight, loch);
}
if (allowswap)
{
Element2d sw1 (pi4, pi3, pi1);
Element2d sw2 (pi3, pi4, pi2);
int legal1 =
mesh.LegalTrig (mesh[t1]) +
mesh.LegalTrig (mesh[t2]);
int legal2 =
mesh.LegalTrig (sw1) + mesh.LegalTrig (sw2);
if (legal1 < legal2) should = true;
if (legal2 < legal1) should = false;
}
if (should)
{
// do swapping !
done = true;
/*
mesh[t1] = { pi1, pi4, pi3 };
mesh[t2] = { pi2, pi3, pi4 };
mesh[t1].GeomInfoPi(1) = gi1;
mesh[t1].GeomInfoPi(2) = gi4;
mesh[t1].GeomInfoPi(3) = gi3;
mesh[t2].GeomInfoPi(1) = gi2;
mesh[t2].GeomInfoPi(2) = gi3;
mesh[t2].GeomInfoPi(3) = gi4;
*/
mesh[t1] = { { pi1, gi1 }, { pi4, gi4 }, { pi3, gi3 } };
mesh[t2] = { { pi2, gi2 }, { pi3, gi3 }, { pi4, gi4 } };
pdef[pi1]--;
pdef[pi2]--;
pdef[pi3]++;
pdef[pi4]++;
swapped[t1] = true;
swapped[t2] = true;
}
}
}
} }
t--; t--;
} }

View File

@ -2,6 +2,20 @@
#define FILE_IMPROVE2 #define FILE_IMPROVE2
class Neighbour
{
int nr[3];
int orient[3];
public:
Neighbour () { ; }
void SetNr (int side, int anr) { nr[side] = anr; }
int GetNr (int side) { return nr[side]; }
void SetOrientation (int side, int aorient) { orient[side] = aorient; }
int GetOrientation (int side) { return orient[side]; }
};
/// ///
class MeshOptimize2d class MeshOptimize2d
@ -22,6 +36,8 @@ public:
void ProjectBoundaryPoints(NgArray<int> & surfaceindex, void ProjectBoundaryPoints(NgArray<int> & surfaceindex,
const NgArray<Point<3>* > & from, NgArray<Point<3>* > & dest); const NgArray<Point<3>* > & from, NgArray<Point<3>* > & dest);
bool EdgeSwapping (Mesh & mesh, const int usemetric, Array<Neighbour> &neighbors, Array<bool> &swapped,
const SurfaceElementIndex t1, const int edge, const int surfnr, const int t, NgArray<int,PointIndex::BASE> &pdef, const bool check_only=false);
void EdgeSwapping (Mesh & mesh, int usemetric); void EdgeSwapping (Mesh & mesh, int usemetric);
void CombineImprove (Mesh & mesh); void CombineImprove (Mesh & mesh);
void SplitImprove (Mesh & mesh); void SplitImprove (Mesh & mesh);