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uniform refinement for quads

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This commit is contained in:
Joachim Schoeberl 2021-04-18 17:53:16 +02:00
parent e860cf188b
commit 9033de843b
1 changed files with 74 additions and 42 deletions
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110
libsrc/meshing/refine.cpp
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@ -77,6 +77,32 @@ namespace netgen
}
break;
}
case QUAD:
{
static int betw[5][3] =
{ { 0, 1, 4 },
{ 1, 2, 5 },
{ 2, 3, 6 },
{ 0, 3, 7 },
{ 0, 2, 8 } }; // one diagonal of the quad. should change later to mid-point of edge mid-points
for (int j = 0; j < 5; j++)
{
auto i2 = PointIndices<2>::Sort(el[betw[j][0]],el[betw[j][1]]);
if (j == 4)
{
auto i2a = PointIndices<2>::Sort(el[0], el[2]);
auto i2b = PointIndices<2>::Sort(el[1], el[3]);
i2 = i2a[0] < i2b[0] ? i2a : i2b;
}
if (!between.Used(i2))
{
between.Set (i2, 0);
parents.Append(i2);
}
}
break;
}
default:
throw NgException ("currently refinement for quad-elements is not supported");
}
@ -281,70 +307,76 @@ namespace netgen
case QUAD6:
case QUAD8:
{
NgArrayMem<PointIndex,9> pnums(9);
NgArrayMem<PointGeomInfo,9> pgis(9);
PointIndex pnums[9];
PointGeomInfo pgis[9];
static int betw[5][3] =
{ { 1, 2, 5 },
{ { 0, 1, 4 },
{ 1, 2, 5 },
{ 2, 3, 6 },
{ 3, 4, 7 },
{ 1, 4, 8 },
{ 5, 7, 9 } };
{ 0, 3, 7 },
{ 0, 2, 8 } };
for (int j = 1; j <= 4; j++)
for (int j = 0; j < 4; j++)
{
pnums.Elem(j) = el.PNum(j);
pgis.Elem(j) = el.GeomInfoPi(j);
pnums[j] = el[j];
pgis[j] = el.GeomInfoPi(j+1);
}
for (int j = 0; j < 5; j++)
{
int pi1 = pnums.Elem(betw[j][0]);
int pi2 = pnums.Elem(betw[j][1]);
int pi1 = pnums[betw[j][0]];
int pi2 = pnums[betw[j][1]];
INDEX_2 i2 (pi1, pi2);
i2.Sort();
if (between.Used(i2))
{
pnums.Elem(5+j) = between.Get(i2);
pgis.Elem(5+j) = surfgi.Get(pnums.Elem(4+j));
}
else
{
Point<3> pb;
geo.PointBetween(mesh.Point (pi1),
mesh.Point (pi2), 0.5,
mesh.GetFaceDescriptor(el.GetIndex ()).SurfNr(),
el.GeomInfoPi (betw[j][0]),
el.GeomInfoPi (betw[j][1]),
pb, pgis.Elem(5+j));
if (j == 4)
{
auto i2a = PointIndices<2>::Sort(el[0], el[2]);
auto i2b = PointIndices<2>::Sort(el[1], el[3]);
i2 = i2a[0] < i2b[0] ? i2a : i2b;
}
pnums.Elem(5+j) = mesh.AddPoint (pb);
Point<3> pb;
PointGeomInfo pgi;
geo.PointBetween(mesh.Point (pi1), mesh.Point (pi2), 0.5,
mesh.GetFaceDescriptor(el.GetIndex ()).SurfNr(),
el.GeomInfoPi (betw[j][0]+1 ),
el.GeomInfoPi (betw[j][1]+1 ),
pb, pgi);
between.Set (i2, pnums.Get(5+j));
pgis[4+j] = pgi;
PointIndex pinew = between.Get(i2);
pnums[4+j] = pinew;
if (surfgi.Size() < pnums.Elem(5+j))
surfgi.SetSize (pnums.Elem(5+j));
surfgi.Elem(pnums.Elem(5+j)) = pgis.Elem(5+j);
}
}
if (!pointset[pinew])
{
pointset[pinew] = true;
mesh.Point(pinew) = pb;
}
if (surfgi.Size() < pnums[4+j])
surfgi.SetSize (pnums[4+j]);
surfgi.Elem(pnums[4+j]) = pgis[4+j];
}
static int reftab[4][4] =
{
{ 1, 5, 9, 8 },
{ 5, 2, 6, 9 },
{ 8, 9, 7, 4 },
{ 9, 6, 3, 7 } };
{ 0, 4, 8, 7 },
{ 4, 1, 5, 8 },
{ 7, 8, 6, 3 },
{ 8, 5, 2, 6 } };
int ind = el.GetIndex();
for (int j = 0; j < 4; j++)
{
Element2d nel(QUAD);
for (int k = 1; k <= 4; k++)
for (int k = 0; k < 4; k++)
{
nel.PNum(k) = pnums.Get(reftab[j][k-1]);
nel.GeomInfoPi(k) = pgis.Get(reftab[j][k-1]);
nel[k] = pnums[reftab[j][k]];
nel.GeomInfoPi(k+1) = pgis[reftab[j][k]];
}
nel.SetIndex(ind);