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Commit df77adf8 authored by Christophe Geuzaine's avatar Christophe Geuzaine
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rewrote the elliptic smoother in parametric coordinates
parent fe23ad07
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Mesh/meshGFaceTransfinite.cpp
+ 63
− 104
View file @ df77adf8
......@@ -285,113 +285,72 @@ int MeshTransfiniteSurface(GFace *gf)
}
}
// elliptic smoother (don't apply this by default)
if(corners.size() == 4){
// should we smooth the meshing using an elliptic smoother?
int numSmooth = 0;
if(gf->meshAttributes.transfiniteSmoothing < 0 && CTX.mesh.nb_smoothing > 1)
numSmooth = CTX.mesh.nb_smoothing;
else if(gf->meshAttributes.transfiniteSmoothing > 0)
numSmooth = gf->meshAttributes.transfiniteSmoothing;
if(corners.size() == 4 && numSmooth){
std::vector<std::vector<double> > u(L + 1), v(L + 1);
for(int i = 0; i <= L; i++){
u[i].resize(H + 1);
v[i].resize(H + 1);
}
for(int i = 0; i <= L; i++){
for(int j = 0; j <= H; j++){
int iP1 = N1 + i;
int iP2 = N2 + j;
int iP3 = N4 - i;
int iP4 = (N4 + (N3 - N2) - j) % m_vertices.size();
if(j == 0) { u[i][j] = U[iP1]; v[i][j] = V[iP1]; }
else if(i == L){ u[i][j] = U[iP2]; v[i][j] = V[iP2]; }
else if(j == H){ u[i][j] = U[iP3]; v[i][j] = V[iP3]; }
else if(i == 0){ u[i][j] = U[iP4]; v[i][j] = V[iP4]; }
else{
tab[i][j]->getParameter(0, u[i][j]);
tab[i][j]->getParameter(1, v[i][j]);
}
}
}
for(int IT = 0; IT < numSmooth; IT++){
for(int i = 1; i < L; i++){
for(int j = 1; j < H; j++){
// TEST SMOOTHING PARAM COORD : we need to store the param
// coord in a separate array, as we need to compute them for
// the MEdgeVertices too! -- need to use
// reparamOnFace(gf, t)
/*
double uv[2][9];
for(int ii = 0; ii < 2; ii++){
tab[i - 1][j - 1]->getParameter(ii, uv[ii][0]);
tab[i - 1][j ]->getParameter(ii, uv[ii][1]);
tab[i - 1][j + 1]->getParameter(ii, uv[ii][2]);
tab[i ][j - 1]->getParameter(ii, uv[ii][3]);
tab[i ][j ]->getParameter(ii, uv[ii][4]);
tab[i ][j + 1]->getParameter(ii, uv[ii][5]);
tab[i + 1][j - 1]->getParameter(ii, uv[ii][6]);
tab[i + 1][j ]->getParameter(ii, uv[ii][7]);
tab[i + 1][j + 1]->getParameter(ii, uv[ii][8]);
}
double alpha = 0.25 * (SQU(uv[0][5] - uv[0][3]) +
SQU(uv[1][5] - uv[1][3])) ;
double gamma = 0.25 * (SQU(uv[0][7] - uv[0][1]) +
SQU(uv[1][7] - uv[1][1]));
double beta = 0.0625 * ((uv[0][7] - uv[0][1]) * (uv[0][5] - uv[0][3]) +
(uv[1][7] - uv[1][1]) * (uv[1][5] - uv[1][3]));
double u = 0.5 * (alpha * (uv[0][7] + uv[0][1]) +
gamma * (uv[0][5] + uv[0][3]) -
2. * beta * (uv[0][8] - uv[0][2] - uv[0][6] + uv[0][0]))
/ (alpha + gamma);
double v = 0.5 * (alpha * (uv[1][7] + uv[1][1]) +
gamma * (uv[1][5] + uv[1][3]) -
2. * beta * (uv[1][8] - uv[1][2] - uv[1][6] + uv[1][0]))
/ (alpha + gamma);
GPoint p = gf->point(SPoint2(u, v));
tab[i][j]->x() = p.x();
tab[i][j]->y() = p.y();
tab[i][j]->z() = p.z();
tab[i][j]->setParameter(0, u);
tab[i][j]->setParameter(1, v);
*/
MVertex *v11 = tab[i - 1][j - 1];
MVertex *v12 = tab[i - 1][j ];
MVertex *v13 = tab[i - 1][j + 1];
MVertex *v21 = tab[i ][j - 1];
MVertex *v22 = tab[i ][j ];
MVertex *v23 = tab[i ][j + 1];
MVertex *v31 = tab[i + 1][j - 1];
MVertex *v32 = tab[i + 1][j ];
MVertex *v33 = tab[i + 1][j + 1];
double alpha = 0.25 * (SQU(v23->x() - v21->x()) +
SQU(v23->y() - v21->y()) +
SQU(v23->z() - v21->z()));
double gamma = 0.25 * (SQU(v32->x() - v12->x()) +
SQU(v32->y() - v12->y()) +
SQU(v32->z() - v12->z()));
double beta = 0.0625 * ((v32->x() - v12->x()) * (v23->x() - v21->x()) +
(v32->y() - v12->y()) * (v23->y() - v21->y()) +
(v32->z() - v12->z()) * (v23->z() - v21->z()));
v22->x() = 0.5 * (alpha * (v32->x() + v12->x()) +
gamma * (v23->x() + v21->x()) -
2. * beta * (v33->x() - v13->x() -
v31->x() + v11->x())) / (alpha + gamma);
v22->y() = 0.5 * (alpha * (v32->y() + v12->y()) +
gamma * (v23->y() + v21->y()) -
2. * beta * (v33->y() - v13->y() -
v31->y() + v11->y())) / (alpha + gamma);
v22->z() = 0.5 * (alpha * (v32->z() + v12->z()) +
gamma * (v23->z() + v21->z()) -
2. * beta * (v33->z() - v13->z() -
v31->z() + v11->z())) / (alpha + gamma);
if(IT == numSmooth - 1 && gf->geomType() != GEntity::Plane){
double init[2] = {0.5, 0.5}; // this is bad
GPoint p = gf->closestPoint(v22->point(), init);
v22->x() = p.x();
v22->y() = p.y();
v22->z() = p.z();
}
double alpha = 0.25 * (SQU(u[i][j + 1] - u[i][j - 1]) +
SQU(v[i][j + 1] - v[i][j - 1])) ;
double gamma = 0.25 * (SQU(u[i + 1][j] - u[i - 1][j]) +
SQU(v[i + 1][j] - v[i - 1][j]));
double beta = 0.0625 *
((u[i + 1][j] - u[i - 1][j]) * (u[i][j + 1] - u[i][j - 1]) +
(v[i + 1][j] - v[i - 1][j]) * (v[i][j + 1] - v[i][j - 1]));
u[i][j] = 0.5 *
(alpha * (u[i + 1][j] + u[i - 1][j]) +
gamma * (u[i][j + 1] + u[i][j - 1]) -
2. * beta * (u[i + 1][j + 1] - u[i - 1][j + 1] -
u[i + 1][j - 1] + u[i - 1][j - 1])) / (alpha + gamma);
v[i][j] = 0.5 *
(alpha * (v[i + 1][j] + v[i - 1][j]) +
gamma * (v[i][j + 1] + v[i][j - 1]) -
2. * beta * (v[i + 1][j + 1] - v[i - 1][j + 1] -
v[i + 1][j - 1] + v[i - 1][j - 1])) / (alpha + gamma);
}
}
}
// recompute corresponding u,v coordinates (necessary e.g. for 2nd order algo)
for(int i = 1; i < L; i++){
for(int j = 1; j < H; j++){
MVertex *v = tab[i][j];
SPoint2 param = gf->parFromPoint(SPoint3(v->x(), v->y(), v->z()));
v->setParameter(0, param[0]);
v->setParameter(1, param[1]);
GPoint p = gf->point(SPoint2(u[i][j], v[i][j]));
tab[i][j]->x() = p.x();
tab[i][j]->y() = p.y();
tab[i][j]->z() = p.z();
tab[i][j]->setParameter(0, u[i][j]);
tab[i][j]->setParameter(1, v[i][j]);
}
}
}
if(corners.size() == 4){
// create elements
if(corners.size() == 4){
for(int i = 0; i < L ; i++){
for(int j = 0; j < H; j++){
MVertex *v1 = tab[i][j];
......
doc/TODO.txt
+ 7
− 1
View file @ df77adf8
$Id: TODO.txt,v 1.8 2008-10-12 14:57:58 geuzaine Exp $
$Id: TODO.txt,v 1.9 2008-11-04 18:21:43 geuzaine Exp $
********************************************************************
Introduce keyword "All" or "*" in ListOfShapes so that we can apply an
operator (e.g Recombine) on all defined entities (instead of doing
"{1:N}")
********************************************************************
......
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