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0021422: EDF 1963 SMESH: Viscous layer algorithm fails in some cases

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1) fix getting node UV on a periodic FACE
2) enable inflation along a seam edge
3) force shrinking on a FACE at relatively thin layers
This commit is contained in:
eap 2011-11-16 15:35:58 +00:00
parent 2daf574775
commit 02024c6589
1 changed files with 60 additions and 23 deletions
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83
src/StdMeshers/StdMeshers_ViscousLayers.cxx
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@ -224,13 +224,14 @@ namespace VISCOUS
- M[0][2]*M[1][1]*M[2][0]);
return determinant > 1e-100;
}
bool IsForward(const gp_XY& tgtUV,
const TopoDS_Face& face,
SMESH_MesherHelper& helper,
const double refSign) const
bool IsForward(const gp_XY& tgtUV,
const SMDS_MeshNode* smoothedNode,
const TopoDS_Face& face,
SMESH_MesherHelper& helper,
const double refSign) const
{
gp_XY prevUV = helper.GetNodeUV( face, _nPrev );
gp_XY nextUV = helper.GetNodeUV( face, _nNext );
gp_XY prevUV = helper.GetNodeUV( face, _nPrev, smoothedNode );
gp_XY nextUV = helper.GetNodeUV( face, _nNext, smoothedNode );
gp_Vec2d v1( tgtUV, prevUV ), v2( tgtUV, nextUV );
double d = v1 ^ v2;
return d*refSign > 1e-100;
@ -1104,7 +1105,25 @@ bool _ViscousBuilder::findFacesWithLayers()
{
case 1:
{
_sdVec[i]._shrinkShape2Shape.insert( make_pair( vInd, facesWOL[0] )); break;
helper.SetSubShape( facesWOL[0] );
if ( helper.IsRealSeam( vInd )) // inflate along a seam edge?
{
TopoDS_Shape seamEdge;
PShapeIteratorPtr eIt = helper.GetAncestors(vertex, *_mesh, TopAbs_EDGE);
while ( eIt->more() && seamEdge.IsNull() )
{
const TopoDS_Shape* e = eIt->next();
if ( helper.IsRealSeam( *e ) )
seamEdge = *e;
}
if ( !seamEdge.IsNull() )
{
_sdVec[i]._shrinkShape2Shape.insert( make_pair( vInd, seamEdge ));
break;
}
}
_sdVec[i]._shrinkShape2Shape.insert( make_pair( vInd, facesWOL[0] ));
break;
}
case 2:
{
@ -2053,10 +2072,12 @@ bool _ViscousBuilder::smoothAndCheck(_SolidData& data,
TGeomID sInd = data._edges[ iBeg ]->_nodes[0]->getshapeId();
if ( data._edges[ iBeg ]->IsOnEdge() )
{ // try a simple solution on an analytic EDGE
{
dumpFunction(SMESH_Comment("smooth")<<data._index << "_Ed"<<sInd <<"_InfStep"<<nbSteps);
// try a simple solution on an analytic EDGE
if ( !smoothAnalyticEdge( data, iBeg, iEnd, surface, F, helper ))
{
dumpFunction(SMESH_Comment("smooth")<<data._index << "_Ed"<<sInd <<"_InfStep"<<nbSteps);
// smooth on EDGE's
int step = 0;
do {
@ -2069,9 +2090,8 @@ bool _ViscousBuilder::smoothAndCheck(_SolidData& data,
}
while ( moved && step++ < 5 );
//cout << " NB STEPS: " << step << endl;
dumpFunctionEnd();
}
dumpFunctionEnd();
}
else
{
@ -2327,21 +2347,35 @@ bool _ViscousBuilder::smoothAnalyticEdge( _SolidData& data,
data._edges[i]->_pos.back() = newPos;
SMDS_MeshNode* tgtNode = const_cast<SMDS_MeshNode*>( data._edges[i]->_nodes.back() );
tgtNode->setXYZ( newPos.X(), newPos.Y(), newPos.Z() );
dumpMove( tgtNode );
}
}
else
{
gp_XY uv0 = helper.GetNodeUV( F, data._edges[iFrom]->_2neibors->_nodes[0]);
gp_XY uv1 = helper.GetNodeUV( F, data._edges[iTo-1]->_2neibors->_nodes[1]);
if ( data._edges[iFrom]->_2neibors->_nodes[0] ==
data._edges[iTo-1]->_2neibors->_nodes[1] ) // closed edge
{
int iPeriodic = helper.GetPeriodicIndex();
if ( iPeriodic == 1 || iPeriodic == 2 )
{
uv1.SetCoord( iPeriodic, helper.GetOtherParam( uv1.Coord( iPeriodic )));
if ( uv0.Coord( iPeriodic ) > uv1.Coord( iPeriodic ))
std::swap( uv0, uv1 );
}
}
const gp_XY rangeUV = uv1 - uv0;
for ( int i = iFrom; i < iTo; ++i )
{
double r = len[i-iFrom] / len.back();
gp_XY newUV = uv0 * ( 1. - r ) + uv1 * r;
gp_XY newUV = uv0 + r * rangeUV;
data._edges[i]->_pos.back().SetCoord( newUV.X(), newUV.Y(), 0 );
gp_Pnt newPos = surface->Value( newUV.X(), newUV.Y() );
SMDS_MeshNode* tgtNode = const_cast<SMDS_MeshNode*>( data._edges[i]->_nodes.back() );
tgtNode->setXYZ( newPos.X(), newPos.Y(), newPos.Z() );
dumpMove( tgtNode );
SMDS_FacePosition* pos = static_cast<SMDS_FacePosition*>( tgtNode->GetPosition() );
pos->SetUParameter( newUV.X() );
@ -2388,6 +2422,7 @@ bool _ViscousBuilder::smoothAnalyticEdge( _SolidData& data,
gp_Pnt newPos = surface->Value( newUV.X(), newUV.Y() );
SMDS_MeshNode* tgtNode = const_cast<SMDS_MeshNode*>( data._edges[i]->_nodes.back() );
tgtNode->setXYZ( newPos.X(), newPos.Y(), newPos.Z() );
dumpMove( tgtNode );
SMDS_FacePosition* pos = static_cast<SMDS_FacePosition*>( tgtNode->GetPosition() );
pos->SetUParameter( newUV.X() );
@ -3329,7 +3364,6 @@ bool _ViscousBuilder::shrink()
_SolidData& data = *f2sd->second;
TNode2Edge& n2eMap = data._n2eMap;
const TopoDS_Face& F = TopoDS::Face( getMeshDS()->IndexToShape( f2sd->first ));
const bool reverse = ( data._reversedFaceIds.count( f2sd->first ));
Handle(Geom_Surface) surface = BRep_Tool::Surface(F);
@ -3357,12 +3391,15 @@ bool _ViscousBuilder::shrink()
// Find out face orientation
double refSign = 1;
const set<TGeomID> ignoreShapes;
bool isOkUV;
if ( !smoothNodes.empty() )
{
gp_XY uv = helper.GetNodeUV( F, smoothNodes[0] );
vector<_Simplex> simplices;
getSimplices( smoothNodes[0], simplices, ignoreShapes );
if ( simplices[0].IsForward(uv, F, helper,refSign) != (!reverse))
helper.GetNodeUV( F, simplices[0]._nPrev, 0, &isOkUV ); // fix UV of silpmex nodes
helper.GetNodeUV( F, simplices[0]._nNext, 0, &isOkUV );
gp_XY uv = helper.GetNodeUV( F, smoothNodes[0], 0, &isOkUV );
if ( !simplices[0].IsForward(uv, smoothNodes[0], F, helper,refSign) )
refSign = -1;
}
@ -3411,7 +3448,6 @@ bool _ViscousBuilder::shrink()
}
// Create _SmoothNode's on face F
bool isOkUV;
vector< _SmoothNode > nodesToSmooth( smoothNodes.size() );
{
dumpFunction(SMESH_Comment("beforeShrinkFace")<<f2sd->first); // debug
@ -3465,8 +3501,6 @@ bool _ViscousBuilder::shrink()
shrinked |= lEdges[i]->SetNewLength2d( surface,F,helper );
}
dumpFunctionEnd();
if ( !shrinked )
break;
// Move nodes on EDGE's
set< _Shrinker1D* >::iterator shr = eShri1D.begin();
@ -3498,6 +3532,9 @@ bool _ViscousBuilder::shrink()
}
if ( badNb > 0 )
return error(SMESH_Comment("Can't shrink 2D mesh on face ") << f2sd->first );
if ( !shrinked )
break;
}
// No wrongly shaped faces remain; final smooth. Set node XYZ.
// First, find out a needed quality of smoothing (high for quadrangles only)
@ -3517,7 +3554,7 @@ bool _ViscousBuilder::shrink()
highQuality = ( *nbNodesSet.begin() == 4 );
}
}
for ( int st = highQuality ? 8 : 3; st; --st )
for ( int st = highQuality ? 10 : 3; st; --st )
{
dumpFunction(SMESH_Comment("shrinkFace")<<f2sd->first<<"_st"<<++smooStep); // debug
for ( unsigned i = 0; i < nodesToSmooth.size(); ++i )
@ -3527,7 +3564,7 @@ bool _ViscousBuilder::shrink()
// Set an event listener to clear FACE sub-mesh together with SOLID sub-mesh
_SrinkShapeListener::ToClearSubMeshWithSolid( sm, data._solid );
}// loop on FACES to srink mesh on
} // loop on FACES to srink mesh on
// Replace source nodes by target nodes in shrinked mesh edges
@ -3822,18 +3859,18 @@ bool _SmoothNode::Smooth(int& badNb,
// compute new UV for the node
gp_XY newPos (0,0);
for ( unsigned i = 0; i < _simplices.size(); ++i )
newPos += helper.GetNodeUV( face, _simplices[i]._nPrev );
newPos += helper.GetNodeUV( face, _simplices[i]._nPrev, _node );
newPos /= _simplices.size();
// count quality metrics (orientation) of triangles around the node
int nbOkBefore = 0;
gp_XY tgtUV = helper.GetNodeUV( face, _node );
for ( unsigned i = 0; i < _simplices.size(); ++i )
nbOkBefore += _simplices[i].IsForward( tgtUV, face, helper, refSign );
nbOkBefore += _simplices[i].IsForward( tgtUV, _node, face, helper, refSign );
int nbOkAfter = 0;
for ( unsigned i = 0; i < _simplices.size(); ++i )
nbOkAfter += _simplices[i].IsForward( newPos, face, helper, refSign );
nbOkAfter += _simplices[i].IsForward( newPos, _node, face, helper, refSign );
if ( nbOkAfter < nbOkBefore )
return false;