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0022136: EDF 2345 SMESH: Improving documentation of Quadrangle mapping with the type "Reduced"

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1) Send a warning if Reduced transition can't be used.
2) Fix SIGSEGV for the case of nbRows = 1, nbTop = 4, nbBot = 16
This commit is contained in:
eap 2013-05-29 13:41:51 +00:00
parent 6609664fc3
commit ccd189545b
1 changed files with 33 additions and 14 deletions
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47
src/StdMeshers/StdMeshers_Quadrangle_2D.cxx
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@ -254,6 +254,17 @@ bool StdMeshers_Quadrangle_2D::Compute (SMESH_Mesh& aMesh,
Smooth( quad );
return ok;
}
if ( n1 != n3 && n2 != n4 )
error( COMPERR_WARNING,
"To use 'Reduced' transition, "
"two opposite sides should have same number of segments, "
"but actual number of segments is different on all sides. "
"'Standard' transion has been used.");
else
error( COMPERR_WARNING,
"To use 'Reduced' transition, "
"two opposite sides should have an even difference in number of segments. "
"'Standard' transion has been used.");
}
// set normalized grid on unit square in parametric domain
@ -2316,19 +2327,20 @@ namespace
* Implementation of Reduced algorithm (meshing with quadrangles only)
*/
//=======================================================================
bool StdMeshers_Quadrangle_2D::ComputeReduced (SMESH_Mesh & aMesh,
const TopoDS_Shape& aShape,
FaceQuadStruct::Ptr quad)
{
SMESHDS_Mesh * meshDS = aMesh.GetMeshDS();
const TopoDS_Face& F = TopoDS::Face(aShape);
SMESHDS_Mesh * meshDS = aMesh.GetMeshDS();
const TopoDS_Face& F = TopoDS::Face(aShape);
Handle(Geom_Surface) S = BRep_Tool::Surface(F);
int i,j,geomFaceID = meshDS->ShapeToIndex(F);
int i,j,geomFaceID = meshDS->ShapeToIndex(F);
int nb = quad->side[0]->NbPoints();
int nr = quad->side[1]->NbPoints();
int nt = quad->side[2]->NbPoints();
int nl = quad->side[3]->NbPoints();
int nb = quad->side[0]->NbPoints(); // bottom
int nr = quad->side[1]->NbPoints(); // right
int nt = quad->side[2]->NbPoints(); // top
int nl = quad->side[3]->NbPoints(); // left
// Simple Reduce 10->8->6->4 (3 steps) Multiple Reduce 10->4 (1 step)
//
@ -2374,13 +2386,21 @@ bool StdMeshers_Quadrangle_2D::ComputeReduced (SMESH_Mesh & aMesh,
}
// number of rows and columns
int nrows = nr1 - 1;
int nrows = nr1 - 1;
int ncol_top = nt1 - 1;
int ncol_bot = nb1 - 1;
// number of rows needed to reduce ncol_bot to ncol_top using simple 3->1 "tree" (see below)
int nrows_tree31 = int( log( (double)(ncol_bot / ncol_top) ) / log((double) 3 )); // = log x base 3
int nrows_tree31 =
int( ceil( log( double(ncol_bot) / ncol_top) / log( 3.))); // = log x base 3
if ( nrows < nrows_tree31 )
{
MultipleReduce = true;
error( COMPERR_WARNING,
SMESH_Comment("To use 'Reduced' transition, "
"number of face rows should be at least ")
<< nrows_tree31 << ". Actual number of face rows is " << nrows << ". "
"'Quadrangle preference (reversed)' transion has been used.");
}
}
if (MultipleReduce) { // == ComputeQuadPref QUAD_QUADRANGLE_PREF_REVERSED
@ -2624,7 +2644,7 @@ bool StdMeshers_Quadrangle_2D::ComputeReduced (SMESH_Mesh & aMesh,
// add bottom nodes (first columns)
for (i=2; i<nb; i++)
NodesC.SetValue(i,1,uv_eb[i-1].node);
// create and add needed nodes
// add linear layers
for (i=2; i<nb; i++) {
@ -2656,13 +2676,12 @@ bool StdMeshers_Quadrangle_2D::ComputeReduced (SMESH_Mesh & aMesh,
// create faces
for (i=1; i<nb; i++) {
for (j=1; j<nbv; j++) {
SMDS_MeshFace* F =
myHelper->AddFace(NodesC.Value(i,j), NodesC.Value(i+1,j),
SMDS_MeshFace* F =
myHelper->AddFace(NodesC.Value(i,j), NodesC.Value(i+1,j),
NodesC.Value(i+1,j+1), NodesC.Value(i,j+1));
if (F) meshDS->SetMeshElementOnShape(F, geomFaceID);
if (F) meshDS->SetMeshElementOnShape(F, geomFaceID);
}
}
// TODO ???
} // end Multiple Reduce implementation
else { // Simple Reduce (!MultipleReduce)
//=========================================================