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22539: [CEA 1126] Quadrangle mapping on produces a non conform mesh

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fix for a case of few (1-2) nb of side divisions
This commit is contained in:
eap 2014-04-03 19:39:48 +04:00
parent 5d68554076
commit 54a7f4b412
1 changed files with 101 additions and 21 deletions
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122
src/StdMeshers/StdMeshers_Quadrangle_2D.cxx
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@ -339,7 +339,7 @@ bool StdMeshers_Quadrangle_2D::computeTriangles(SMESH_Mesh& aMesh,
FaceQuadStruct::Ptr newQuad = myQuadList.back();
if ( quad != newQuad ) // split done
{
{
{ // update left side limit till where to make triangles
FaceQuadStruct::Ptr botQuad = // a bottom part
( quad->side[ QUAD_LEFT_SIDE ].from == 0 ) ? quad : newQuad;
if ( botQuad->nbNodeOut( QUAD_LEFT_SIDE ) > 0 )
@ -359,12 +359,33 @@ bool StdMeshers_Quadrangle_2D::computeTriangles(SMESH_Mesh& aMesh,
{
splitQuad( quad, quad->iSize-2, 0 );
}
if ( quad->nbNodeOut( QUAD_LEFT_SIDE ))
if ( quad->nbNodeOut( QUAD_LEFT_SIDE ))
{
splitQuad( quad, 1, 0 );
if ( quad->nbNodeOut( QUAD_TOP_SIDE ))
{
newQuad = myQuadList.back();
if ( newQuad == quad ) // too narrow to split
{
// update left side limit till where to make triangles
quad->side[ QUAD_LEFT_SIDE ].to--;
}
else
{
FaceQuadStruct::Ptr leftQuad =
( quad->side[ QUAD_BOTTOM_SIDE ].from == 0 ) ? quad : newQuad;
leftQuad->nbNodeOut( QUAD_TOP_SIDE ) = 0;
}
}
}
return computeQuadDominant( aMesh, aFace );
if ( ! computeQuadDominant( aMesh, aFace ))
return false;
// try to fix zero-area triangles near straight-angle corners
return true;
}
//================================================================================
@ -591,17 +612,50 @@ bool StdMeshers_Quadrangle_2D::computeQuadDominant(SMESH_Mesh& aMesh,
iup = nbhoriz - 1;
int stop = 0;
// if left edge is out, we will stop at a second node
//if (quad->nbNodeOut(3)) stop++;
if ( quad->nbNodeOut( QUAD_RIGHT_SIDE ))
quad->UVPt( nbhoriz-1, 0 ).node = uv_e1[ nbright-2 ].node;
if ( quad->nbNodeOut( QUAD_LEFT_SIDE ))
quad->UVPt( 0, 0 ).node = uv_e3[ nbleft-2 ].node;
if ( quad->side[3].grid->Edge(0).IsNull() ) // left side is simulated one
{
// quad divided at I but not at J, as nbvertic==nbright==2
stop++; // we stop at a second node
}
else
{
if ( quad->nbNodeOut( QUAD_RIGHT_SIDE ))
quad->UVPt( nbhoriz-1, 0 ).node = uv_e1[ nbright-2 ].node;
if ( quad->nbNodeOut( QUAD_LEFT_SIDE ))
quad->UVPt( 0, 0 ).node = uv_e3[ nbleft-2 ].node;
if ( nbright > 2 ) // there was a split at J
quad->nbNodeOut( QUAD_LEFT_SIDE ) = 0;
}
const SMDS_MeshNode *a, *b, *c, *d;
i = nbup - 1;
// avoid creating zero-area triangles near a straight-angle corner
{
a = uv_e2[i].node;
b = uv_e2[i-1].node;
c = uv_e1[nbright-2].node;
SMESH_TNodeXYZ pa( a ), pb( b ), pc( c );
double area = 0.5 * (( pb - pa ) ^ ( pc - pa )).Modulus();
if ( Abs( area ) < 1e-20 )
{
--g;
d = quad->UVPt( g, nbvertic-2 ).node;
if ( myTrianglePreference )
{
if ( SMDS_MeshFace* face = myHelper->AddFace(a, d, c))
meshDS->SetMeshElementOnShape(face, geomFaceID);
}
else
{
if ( SMDS_MeshFace* face = myHelper->AddFace(a, b, d, c))
meshDS->SetMeshElementOnShape(face, geomFaceID);
--i;
}
}
}
// for each node of the up edge find nearest node
// in the first row of the regular grid and link them
for (i = nbup - 1; i > stop; i--) {
const SMDS_MeshNode *a, *b, *c, *d;
for ( ; i > stop; i--) {
a = uv_e2[i].node;
b = uv_e2[i - 1].node;
gp_Pnt pb (b->X(), b->Y(), b->Z());
@ -745,8 +799,34 @@ bool StdMeshers_Quadrangle_2D::computeQuadDominant(SMESH_Mesh& aMesh,
int g = nbvertic - 1; // last processed node in the grid
int stop = 0;
i = quad->side[ QUAD_LEFT_SIDE ].to-1; // nbleft - 1;
for (; i > stop; i--) {
const SMDS_MeshNode *a, *b, *c, *d;
const SMDS_MeshNode *a, *b, *c, *d;
// avoid creating zero-area triangles near a straight-angle corner
{
a = uv_e3[i].node;
b = uv_e3[i-1].node;
c = quad->UVPt( 1, g ).node;
SMESH_TNodeXYZ pa( a ), pb( b ), pc( c );
double area = 0.5 * (( pb - pa ) ^ ( pc - pa )).Modulus();
if ( Abs( area ) < 1e-20 )
{
--g;
d = quad->UVPt( 1, g ).node;
if ( myTrianglePreference )
{
if ( SMDS_MeshFace* face = myHelper->AddFace(a, d, c))
meshDS->SetMeshElementOnShape(face, geomFaceID);
}
else
{
if ( SMDS_MeshFace* face = myHelper->AddFace(a, b, d, c))
meshDS->SetMeshElementOnShape(face, geomFaceID);
--i;
}
}
}
for (; i > stop; i--) // loop on nodes on the left side
{
a = uv_e3[i].node;
b = uv_e3[i - 1].node;
gp_Pnt pb (b->X(), b->Y(), b->Z());
@ -756,12 +836,13 @@ bool StdMeshers_Quadrangle_2D::computeQuadDominant(SMESH_Mesh& aMesh,
if (i == stop + 1) { // down bondary reached
c = quad->uv_grid[nbhoriz*jlow + 1].node;
near = jlow;
} else {
}
else {
double mind = RealLast();
for (int k = g; k >= jlow; k--) {
const SMDS_MeshNode *nk;
if (k > jup)
nk = uv_e2[1].node;
nk = quad->uv_grid[nbhoriz*jup + 1].node; //uv_e2[1].node;
else
nk = quad->uv_grid[nbhoriz*k + 1].node;
gp_Pnt pnk (nk->X(), nk->Y(), nk->Z());
@ -782,11 +863,10 @@ bool StdMeshers_Quadrangle_2D::computeQuadDominant(SMESH_Mesh& aMesh,
}
else { // make quadrangle
if (near + 1 > jup)
d = uv_e2[1].node;
d = quad->uv_grid[nbhoriz*jup + 1].node; //uv_e2[1].node;
else
d = quad->uv_grid[nbhoriz*(near + 1) + 1].node;
//SMDS_MeshFace* face = meshDS->AddFace(a, b, c, d);
if (!myTrianglePreference){
if (!myTrianglePreference) {
SMDS_MeshFace* face = myHelper->AddFace(a, b, c, d);
if (face) meshDS->SetMeshElementOnShape(face, geomFaceID);
}
@ -798,7 +878,7 @@ bool StdMeshers_Quadrangle_2D::computeQuadDominant(SMESH_Mesh& aMesh,
for (int k = near + 1; k < g; k++) {
c = quad->uv_grid[nbhoriz*k + 1].node;
if (k + 1 > jup)
d = uv_e2[1].node;
d = quad->uv_grid[nbhoriz*jup + 1].node; //uv_e2[1].node;
else
d = quad->uv_grid[nbhoriz*(k + 1) + 1].node;
SMDS_MeshFace* face = myHelper->AddFace(a, c, d);
@ -4707,7 +4787,7 @@ int StdMeshers_Quadrangle_2D::splitQuad(FaceQuadStruct::Ptr quad, int I, int J)
myQuadList.push_back( FaceQuadStruct::Ptr( newQuad ));
vector<UVPtStruct> points;
if ( I > 0 )
if ( I > 0 && I <= quad->iSize-2 )
{
points.reserve( quad->jSize );
for ( int jP = 0; jP < quad->jSize; ++jP )
@ -4746,7 +4826,7 @@ int StdMeshers_Quadrangle_2D::splitQuad(FaceQuadStruct::Ptr quad, int I, int J)
return QUAD_LEFT_SIDE;
}
else if ( J > 0 ) //// split horizontally, a new quad is below an old one
else if ( J > 0 && J <= quad->jSize-2 ) //// split horizontally, a new quad is below an old one
{
points.reserve( quad->iSize );
for ( int iP = 0; iP < quad->iSize; ++iP )