#include <vector>
#include <limits>
+#include <TopExp.hxx>
#include <TopExp_Explorer.hxx>
#include <TopoDS.hxx>
}
#endif
+
+//================================================================================
+/*!
+ * \brief Check that the passed nodes are all IN the face
+ * \param element the element
+ * \param F the geom Face
+ * \param uvValues a vector of size elem->NbCornerNodes() to save the uv coordinate points on the face
+ * \return true if all the nodes are IN the face
+ */
+ //================================================================================
+bool GMSHPlugin_Mesher::IsAllNodesInSameFace( const SMDS_MeshElement* element, const TopoDS_Face& F,
+ std::vector<gp_XY>& uvValues )
+{
+ Handle(ShapeAnalysis_Surface) sprojector = new ShapeAnalysis_Surface( BRep_Tool::Surface( F ));
+ double tol = BRep_Tool::MaxTolerance( F, TopAbs_FACE );
+ int nbN = element->NbCornerNodes();
+ gp_Pnt surfPnt(0,0,0);
+ for ( int i = 0; i < nbN; ++i )
+ {
+ SMESH_NodeXYZ nXYZ( element->GetNode( i ) );
+ gp_XY uv = sprojector->ValueOfUV( nXYZ, tol ).XY();
+ surfPnt = sprojector->Value( uv );
+ double dist = surfPnt.Distance( nXYZ );
+ if ( dist > tol )
+ return false;
+ else
+ uvValues[ i ] = uv;
+ }
+ return true;
+}
+
+//================================================================================
+/*!
+ * \brief Associate mesh elements to geometrical faces.
+ * \param the list of elements
+ * \return a map between faces (incremental order) and mesh elements found to be placed on the face
+ */
+ //================================================================================
+std::map<int,std::vector<std::tuple<smIdType,bool,std::vector<gp_XY>>>> GMSHPlugin_Mesher::AssociateElementsToFaces( std::map<const SMDS_MeshElement*, bool, TIDCompare>& listElements )
+{
+ // Map faces to elementId and uv of nodes.
+ // Index by face id
+ // Index vector with element smIdType, [ gp_XY_0, gp_XY_1, gp_XY_2 ]
+ std::map<int,std::vector<std::tuple<smIdType,bool,std::vector<gp_XY>>>> elementToFaceMap;
+ SMESHDS_Mesh* meshDS = _mesh->GetMeshDS();
+ SMDS_ElemIteratorPtr iteratorElem = meshDS->elementsIterator(SMDSAbs_Face);
+ for ( auto const& [elem, IsReverse] : listElements ) // loop on elements on a geom face
+ {
+ int nbN = elem->NbCornerNodes();
+ std::vector<gp_XY> uvValues(nbN);
+ if ( nbN > 4 /*this restriction might be eliminated. Have to adapt FillGeomMapMeshUsing2DMeshIterator function too */)
+ throw std::string("Polygon sub-meshes not supported");
+
+ int faceId = 1;
+ for( GModel::fiter it = _gModel->firstFace(); it != _gModel->lastFace(); ++it )
+ {
+ GFace *gFace = *it;
+ TopoDS_Face topoFace = *((TopoDS_Face*)gFace->getNativePtr());
+ if ( IsAllNodesInSameFace( elem, topoFace, uvValues ) )
+ {
+ elementToFaceMap[ faceId ].push_back( std::make_tuple( elem->GetID(), IsReverse, uvValues ) );
+ break;
+ }
+ faceId++;
+ }
+ }
+ return elementToFaceMap;
+}
+
+//================================================================================
+/*!
+ * \brief Add the elements found associated to the face as gmsh elements
+ */
+ //================================================================================
+void GMSHPlugin_Mesher::Set2DMeshes( std::vector< const SMDS_MeshNode* >& nodeVec, std::map<const SMDS_MeshElement*, bool, TIDCompare>& listElements )
+{
+ std::map< const SMDS_MeshNode* , const MVertex * > nodes2mvertMap;
+ SMESHDS_Mesh* meshDS = _mesh->GetMeshDS();
+ auto elementToFaceMap = AssociateElementsToFaces( listElements );
+ int faceId = 1;
+ std::vector<MVertex *> mVertices;
+
+ for(GModel::fiter it = _gModel->firstFace(); it != _gModel->lastFace(); ++it)
+ {
+ GFace *gFace = *it;
+ gFace->deleteMesh();
+
+ auto element2uv = elementToFaceMap.find( faceId )->second;
+
+ const int numberOfEntries = element2uv.size();
+
+ for (int el = 0; el < numberOfEntries; el++)
+ {
+ const smIdType elementId = std::get<0>( element2uv[ el ] ); // smesh element id
+ bool isReverse = std::get<1>( element2uv[ el ] );
+ const SMDS_MeshElement* elem = meshDS->FindElement( elementId );
+
+ int nbN = elem->NbCornerNodes();
+ mVertices.resize( nbN );
+
+ for ( int i = 0; i < nbN; ++i )
+ {
+ const SMDS_MeshNode* n = elem->GetNode( i );
+ MVertex * mv = nullptr;
+ auto n2v = nodes2mvertMap.find( n );
+ if ( n2v != nodes2mvertMap.end() )
+ {
+ mv = const_cast< MVertex*>( n2v->second );
+ }
+ else
+ {
+ if ( n->GetPosition()->GetDim() < 2 )
+ throw std::string("Wrong mapping of edge nodes to GMSH nodes");
+ SMESH_NodeXYZ xyz = n;
+ gp_XY uv = std::get<2>(element2uv[ el ])[ i ];
+ mv = new MFaceVertex( xyz.X(), xyz.Y(), xyz.Z(), gFace, uv.X(), uv.Y() );
+ gFace->mesh_vertices.push_back( mv );
+ nodes2mvertMap.insert({ n, mv });
+ _nodeMap.insert ({ mv, n });
+ _premeshednodeMap.insert({ mv, n });
+ }
+ mVertices[ i ] = mv;
+ }
+ // create GMSH mesh faces
+ switch ( nbN ) {
+ case 3:
+ if ( isReverse )
+ gFace->triangles.push_back (new MTriangle(mVertices[0], mVertices[2], mVertices[1]));
+ else
+ gFace->triangles.push_back (new MTriangle(mVertices[0], mVertices[1], mVertices[2]));
+ break;
+ case 4:
+ if ( isReverse )
+ gFace->quadrangles.push_back (new MQuadrangle(mVertices[0], mVertices[3],
+ mVertices[2], mVertices[1]));
+ else
+ gFace->quadrangles.push_back (new MQuadrangle(mVertices[0], mVertices[1],
+ mVertices[2], mVertices[3]));
+ break;
+ default:;
+ }
+ }
+ faceId++; // face counter
+ } // iterator in the face
+
+ // Fill the node
+ nodeVec.resize( nodes2mvertMap.size() + 1, 0 );
+ int count = 1;
+ for (auto k : nodes2mvertMap )
+ {
+ nodeVec[ count ] = k.first; // Index the node id to the smesh node itself
+ count++;
+ }
+}
+
+
+//================================================================================
+/*!
+ * \brief Initialize GMSH model with mesh elements as geometry objects.
+ * Nodes are vertexes and element connections are geom lines
+ */
+ //================================================================================
+void GMSHPlugin_Mesher::FillGeomMapMeshUsing2DMeshIterator( std::map<const SMDS_MeshElement*, bool, TIDCompare>& listElements )
+{
+ gmsh::initialize();
+ gmsh::model::add("mesh");
+ // typedef for maps
+ typedef map< const SMDS_MeshNode*, int, TIDCompare > TNodeToIDMap;
+ typedef TNodeToIDMap::value_type TN2ID;
+ typedef map<std::pair<int, int>, int> TLineToIDMap;
+ TNodeToIDMap aNodeToID;
+ TLineToIDMap aLineToID;
+
+ int aNbOfNodes = 0;
+ int aNbOfLines = 0;
+
+ const int invalid_ID = -1;
+ std::vector<int> aTrinagle( 3, 0 );
+
+ // Playing around with SMESHDS_Mesh structure
+ SMESHDS_Mesh* meshDS = _mesh->GetMeshDS();
+
+ for ( auto const& [elem, IsReverse] : listElements ) // loop on elements on a geom face
+ {
+ if ( elem->NbCornerNodes() != 3 )
+ return;
+
+ for (int iN = 0; iN < 3; ++iN)
+ {
+ const SMDS_MeshNode* aNode = elem->GetNode(iN);
+
+ int& ngID = aNodeToID.insert(TN2ID(aNode, invalid_ID)).first->second;
+ if (ngID == invalid_ID)
+ {
+ ngID = ++aNbOfNodes;
+ gmsh::model::occ::addPoint(aNode->X(), aNode->Y(), aNode->Z(), 1.e-2, ngID);
+ }
+
+ aTrinagle[ IsReverse ? 2 - iN : iN ] = ngID;
+ }
+ // add triangle
+ if ((aTrinagle[0] == aTrinagle[1] ||
+ aTrinagle[0] == aTrinagle[2] ||
+ aTrinagle[2] == aTrinagle[1]))
+ continue;
+
+ std::vector<int> LinesID(3, 0);
+ for (int anIndex = 0; anIndex < 3; ++anIndex)
+ {
+ int aNextIndex = (anIndex + 1) % 3;
+ if (aLineToID.find({ aTrinagle[anIndex], aTrinagle[aNextIndex] }) == aLineToID.end()
+ && aLineToID.find({ aTrinagle[aNextIndex], aTrinagle[anIndex] }) == aLineToID.end())
+ {
+ LinesID[anIndex] = aLineToID.insert({ { aTrinagle[aNextIndex], aTrinagle[anIndex] }, ++aNbOfLines }).first->second;
+ gmsh::model::occ::addLine(aTrinagle[anIndex], aTrinagle[aNextIndex], LinesID[anIndex]);
+ }
+ else
+ {
+ LinesID[anIndex] = aLineToID.find({ aTrinagle[anIndex], aTrinagle[aNextIndex] })->second;
+ if (LinesID[anIndex] == 0)
+ LinesID[anIndex] = aLineToID.find({ aTrinagle[aNextIndex], aTrinagle[anIndex] })->second;
+
+ }
+ }
+ // if (!aProxyMesh->IsTemporary(ls.first))
+ // swap(aTrinagle[1], aTrinagle[2]);
+ gmsh::model::occ::addCurveLoop(LinesID);
+ }
+}
+
//================================================================================
/*!
* \brief Initialize GMSH model
SMESHDS_Mesh* meshDS = _mesh->GetMeshDS();
int aNbOfNodes = 0;
- int aNbOfCurves = 0;
int aNbOfLines = 0;
std::vector<int> aTrinagle(3, 0);
{
const TopoDS_Shape& aShapeFace = exFa.Current();
int faceID = meshDS->ShapeToIndex(aShapeFace);
-
bool isRev = false;
if (aCheckReverse && aHelper.NbAncestors(aShapeFace, *_mesh, _shape.ShapeType()) > 1)
// IsReversedSubMesh() can work wrong on strongly curved faces,
isRev = aHelper.IsReversedSubMesh(TopoDS::Face(aShapeFace));
const SMESHDS_SubMesh* aSubMeshDSFace = aProxyMesh->GetSubMesh(aShapeFace);
- if (!aSubMeshDSFace) continue;
-
+ if (!aSubMeshDSFace)
+ continue;
SMDS_ElemIteratorPtr iteratorElem = aSubMeshDSFace->GetElements();
if (aHelper.IsQuadraticSubMesh(_shape) &&
dynamic_cast<const SMESH_ProxyMesh::SubMesh*>(aSubMeshDSFace))
// add triangle
if (hasDegen && (aTrinagle[0] == aTrinagle[1] ||
aTrinagle[0] == aTrinagle[2] ||
- aTrinagle[2] == aTrinagle[1]))
- continue;
+ aTrinagle[2] == aTrinagle[1]))
+ continue;
std::vector<int> LinesID(3, 0);
if (!aProxyMesh->IsTemporary(ls.first))
swap(aTrinagle[1], aTrinagle[2]);
- int aTag = gmsh::model::occ::addCurveLoop(LinesID);
+ gmsh::model::occ::addCurveLoop(LinesID);
}
// Generate 1D and 2D mesh
return nullptr;
}
+//================================================================================
+/*!
+ * \brief Get a node by a GMSH mesh vertex
+ */
+//================================================================================
+
+const SMDS_MeshNode* GMSHPlugin_Mesher::PremeshedNode( const MVertex* v )
+{
+ std::map< const MVertex *, const SMDS_MeshNode* >::iterator v2n = _premeshednodeMap.find( v );
+ if ( v2n != _premeshednodeMap.end() )
+ return v2n->second;
+
+ return nullptr;
+}
+
+
//================================================================================
/*!
* \brief Return a corresponding sub-mesh if a shape is meshed
}
}
+bool GMSHPlugin_Mesher::Compute3D( std::vector< const SMDS_MeshNode* >& nodeVec, std::map<const SMDS_MeshElement*, bool, TIDCompare>& listElements, bool addElements )
+{
+ MESSAGE("GMSHPlugin_Mesher::Compute3D");
+ int err = 0;
+ _maxThreads = 1;
+#if GMSH_MAJOR_VERSION >=4 && GMSH_MINOR_VERSION >=3
+ _maxThreads = 1;
+#endif
+
+ char* argv[] = {"-noenv"};
+ GmshInitialize(1,argv);
+ SetGmshOptions();
+ _gModel = new GModel();
+ mymsg msg(_gModel);
+ GmshSetMessageHandler(&msg);
+
+ _gModel->importOCCShape((void*)&_shape);
+ try
+ {
+ HideComputedEntities( _gModel, true );
+ // fill geometry with elements as geom objects
+ FillGeomMapMeshUsing2DMeshIterator( listElements );
+ Set2DMeshes( nodeVec, listElements );
+ _gModel->mesh( /*dim=*/ 3);
+ }
+ catch (std::string& str)
+ {
+ err = 1;
+ MESSAGE(str);
+ }
+ catch (...)
+ {
+ err = 1;
+ MESSAGE("Unrecoverable error during Generation of Gmsh Mesh");
+ }
+
+ if (!err)
+ {
+#if GMSH_MAJOR_VERSION >=4 && GMSH_MINOR_VERSION >=8
+ if (_compounds.size() > 0)
+ SetCompoundMeshVisibility();
+#endif
+ }
+
+ if ( addElements )
+ FillSMesh();
+ MESSAGE("GMSHPlugin_Mesher::Compute3D:End");
+ return err;
+}
+
+void GMSHPlugin_Mesher::finalizeGModel()
+{
+ if ( _gModel )
+ {
+ GmshSetMessageHandler(nullptr);
+ delete _gModel;
+ GmshFinalize();
+ }
+}
+
//=============================================================================
/*!
* Here we are going to use the GMSH mesher
if (_is3d)
{
FillGMSHMesh();
-
Set2DSubMeshes(_gModel);
-
_gModel->mesh( /*dim=*/ 3);
}
else
{
//CTX::instance()->mesh.maxNumThreads1D=1;
-
_gModel->mesh( /*dim=*/ 1);
Set1DSubMeshes(_gModel);
*/
//================================================================================
-void GMSHPlugin_Mesher::HideComputedEntities( GModel* gModel )
+void GMSHPlugin_Mesher::HideComputedEntities( GModel* gModel, bool hideAnyway )
{
CTX::instance()->mesh.meshOnlyVisible = true;
continue;
TopoDS_Edge topoEdge = *((TopoDS_Edge*)gEdge->getNativePtr());
- if ( HasSubMesh( topoEdge ))
+ if ( HasSubMesh( topoEdge ) || hideAnyway )
gEdge->setVisibility(0);
}
continue;
TopoDS_Face topoFace = *((TopoDS_Face*)gFace->getNativePtr());
- if ( HasSubMesh( topoFace ))
+ if ( HasSubMesh( topoFace ) || hideAnyway )
gFace->setVisibility(0);
}
}
