Mesh::MeshObject* Mesher::createMesh() const
{
#ifndef HAVE_SMESH
throw Base::Exception("SMESH is not available on this platform");
#else
std::list<SMESH_Hypothesis*> hypoth;
SMESH_Gen* meshgen = SMESH_Gen::get();
SMESH_Mesh* mesh = meshgen->CreateMesh(0, true);
int hyp=0;
switch (method) {
#if defined (HAVE_NETGEN)
case Netgen: {
NETGENPlugin_Hypothesis_2D* hyp2d = new NETGENPlugin_Hypothesis_2D(hyp++,0,meshgen);
if (fineness >=0 && fineness < 5) {
hyp2d->SetFineness(NETGENPlugin_Hypothesis_2D::Fineness(fineness));
}
// user defined values
else {
if (growthRate > 0)
hyp2d->SetGrowthRate(growthRate);
if (nbSegPerEdge > 0)
hyp2d->SetNbSegPerEdge(nbSegPerEdge);
if (nbSegPerRadius > 0)
hyp2d->SetNbSegPerRadius(nbSegPerRadius);
}
hyp2d->SetQuadAllowed(allowquad);
hyp2d->SetOptimize(optimize);
hyp2d->SetSecondOrder(secondOrder); // apply bisecting to create four triangles out of one
hypoth.push_back(hyp2d);
NETGENPlugin_NETGEN_2D* alg2d = new NETGENPlugin_NETGEN_2D(hyp++,0,meshgen);
hypoth.push_back(alg2d);
} break;
#endif
#if defined (HAVE_MEFISTO)
case Mefisto: {
if (maxLength > 0) {
StdMeshers_MaxLength* hyp1d = new StdMeshers_MaxLength(hyp++, 0, meshgen);
hyp1d->SetLength(maxLength);
hypoth.push_back(hyp1d);
}
else if (localLength > 0) {
StdMeshers_LocalLength* hyp1d = new StdMeshers_LocalLength(hyp++,0,meshgen);
hyp1d->SetLength(localLength);
hypoth.push_back(hyp1d);
}
else if (maxArea > 0) {
StdMeshers_MaxElementArea* hyp2d = new StdMeshers_MaxElementArea(hyp++,0,meshgen);
hyp2d->SetMaxArea(maxArea);
hypoth.push_back(hyp2d);
}
else if (deflection > 0) {
StdMeshers_Deflection1D* hyp1d = new StdMeshers_Deflection1D(hyp++,0,meshgen);
hyp1d->SetDeflection(deflection);
hypoth.push_back(hyp1d);
}
else if (minLen > 0 && maxLen > 0) {
StdMeshers_Arithmetic1D* hyp1d = new StdMeshers_Arithmetic1D(hyp++,0,meshgen);
hyp1d->SetLength(minLen, false);
hyp1d->SetLength(maxLen, true);
hypoth.push_back(hyp1d);
}
else {
StdMeshers_AutomaticLength* hyp1d = new StdMeshers_AutomaticLength(hyp++,0,meshgen);
hypoth.push_back(hyp1d);
}
{
StdMeshers_NumberOfSegments* hyp1d = new StdMeshers_NumberOfSegments(hyp++,0,meshgen);
hyp1d->SetNumberOfSegments(1);
hypoth.push_back(hyp1d);
}
if (regular) {
StdMeshers_Regular_1D* hyp1d = new StdMeshers_Regular_1D(hyp++,0,meshgen);
hypoth.push_back(hyp1d);
}
StdMeshers_TrianglePreference* hyp2d_1 = new StdMeshers_TrianglePreference(hyp++,0,meshgen);
hypoth.push_back(hyp2d_1);
StdMeshers_MEFISTO_2D* alg2d = new StdMeshers_MEFISTO_2D(hyp++,0,meshgen);
hypoth.push_back(alg2d);
} break;
#endif
default:
break;
}
// Set new cout
MeshingOutput stdcout;
std::streambuf* oldcout = std::cout.rdbuf(&stdcout);
// Apply the hypothesis and create the mesh
mesh->ShapeToMesh(shape);
for (int i=0; i<hyp;i++)
mesh->AddHypothesis(shape, i);
meshgen->Compute(*mesh, mesh->GetShapeToMesh());
// Restore old cout
std::cout.rdbuf(oldcout);
// build up the mesh structure
SMDS_FaceIteratorPtr aFaceIter = mesh->GetMeshDS()->facesIterator();
SMDS_NodeIteratorPtr aNodeIter = mesh->GetMeshDS()->nodesIterator();
MeshCore::MeshPointArray verts;
MeshCore::MeshFacetArray faces;
verts.reserve(mesh->NbNodes());
faces.reserve(mesh->NbFaces());
int index=0;
std::map<const SMDS_MeshNode*, int> mapNodeIndex;
for (;aNodeIter->more();) {
const SMDS_MeshNode* aNode = aNodeIter->next();
MeshCore::MeshPoint p;
p.Set((float)aNode->X(), (float)aNode->Y(), (float)aNode->Z());
verts.push_back(p);
mapNodeIndex[aNode] = index++;
}
for (;aFaceIter->more();) {
const SMDS_MeshFace* aFace = aFaceIter->next();
if (aFace->NbNodes() == 3) {
MeshCore::MeshFacet f;
for (int i=0; i<3;i++) {
const SMDS_MeshNode* node = aFace->GetNode(i);
f._aulPoints[i] = mapNodeIndex[node];
}
faces.push_back(f);
}
else if (aFace->NbNodes() == 4) {
MeshCore::MeshFacet f1, f2;
const SMDS_MeshNode* node0 = aFace->GetNode(0);
const SMDS_MeshNode* node1 = aFace->GetNode(1);
const SMDS_MeshNode* node2 = aFace->GetNode(2);
const SMDS_MeshNode* node3 = aFace->GetNode(3);
f1._aulPoints[0] = mapNodeIndex[node0];
f1._aulPoints[1] = mapNodeIndex[node1];
f1._aulPoints[2] = mapNodeIndex[node2];
f2._aulPoints[0] = mapNodeIndex[node0];
f2._aulPoints[1] = mapNodeIndex[node2];
f2._aulPoints[2] = mapNodeIndex[node3];
faces.push_back(f1);
faces.push_back(f2);
}
else if (aFace->NbNodes() == 6) {
MeshCore::MeshFacet f1, f2, f3, f4;
const SMDS_MeshNode* node0 = aFace->GetNode(0);
const SMDS_MeshNode* node1 = aFace->GetNode(1);
const SMDS_MeshNode* node2 = aFace->GetNode(2);
const SMDS_MeshNode* node3 = aFace->GetNode(3);
const SMDS_MeshNode* node4 = aFace->GetNode(4);
const SMDS_MeshNode* node5 = aFace->GetNode(5);
f1._aulPoints[0] = mapNodeIndex[node0];
f1._aulPoints[1] = mapNodeIndex[node3];
f1._aulPoints[2] = mapNodeIndex[node5];
f2._aulPoints[0] = mapNodeIndex[node1];
f2._aulPoints[1] = mapNodeIndex[node4];
f2._aulPoints[2] = mapNodeIndex[node3];
f3._aulPoints[0] = mapNodeIndex[node2];
f3._aulPoints[1] = mapNodeIndex[node5];
f3._aulPoints[2] = mapNodeIndex[node4];
f4._aulPoints[0] = mapNodeIndex[node3];
f4._aulPoints[1] = mapNodeIndex[node4];
f4._aulPoints[2] = mapNodeIndex[node5];
faces.push_back(f1);
faces.push_back(f2);
faces.push_back(f3);
faces.push_back(f4);
}
else if (aFace->NbNodes() == 8) {
MeshCore::MeshFacet f1, f2, f3, f4, f5, f6;
const SMDS_MeshNode* node0 = aFace->GetNode(0);
const SMDS_MeshNode* node1 = aFace->GetNode(1);
const SMDS_MeshNode* node2 = aFace->GetNode(2);
const SMDS_MeshNode* node3 = aFace->GetNode(3);
const SMDS_MeshNode* node4 = aFace->GetNode(4);
const SMDS_MeshNode* node5 = aFace->GetNode(5);
const SMDS_MeshNode* node6 = aFace->GetNode(6);
const SMDS_MeshNode* node7 = aFace->GetNode(7);
f1._aulPoints[0] = mapNodeIndex[node0];
f1._aulPoints[1] = mapNodeIndex[node4];
f1._aulPoints[2] = mapNodeIndex[node7];
f2._aulPoints[0] = mapNodeIndex[node1];
f2._aulPoints[1] = mapNodeIndex[node5];
f2._aulPoints[2] = mapNodeIndex[node4];
f3._aulPoints[0] = mapNodeIndex[node2];
f3._aulPoints[1] = mapNodeIndex[node6];
f3._aulPoints[2] = mapNodeIndex[node5];
f4._aulPoints[0] = mapNodeIndex[node3];
f4._aulPoints[1] = mapNodeIndex[node7];
f4._aulPoints[2] = mapNodeIndex[node6];
// Two solutions are possible:
// <4,6,7>, <4,5,6> or <4,5,7>, <5,6,7>
Base::Vector3d v4(node4->X(),node4->Y(),node4->Z());
Base::Vector3d v5(node5->X(),node5->Y(),node5->Z());
Base::Vector3d v6(node6->X(),node6->Y(),node6->Z());
Base::Vector3d v7(node7->X(),node7->Y(),node7->Z());
double dist46 = Base::DistanceP2(v4,v6);
double dist57 = Base::DistanceP2(v5,v7);
if (dist46 > dist57) {
f5._aulPoints[0] = mapNodeIndex[node4];
f5._aulPoints[1] = mapNodeIndex[node6];
f5._aulPoints[2] = mapNodeIndex[node7];
f6._aulPoints[0] = mapNodeIndex[node4];
f6._aulPoints[1] = mapNodeIndex[node5];
f6._aulPoints[2] = mapNodeIndex[node6];
}
else {
f5._aulPoints[0] = mapNodeIndex[node4];
f5._aulPoints[1] = mapNodeIndex[node5];
f5._aulPoints[2] = mapNodeIndex[node7];
f6._aulPoints[0] = mapNodeIndex[node5];
f6._aulPoints[1] = mapNodeIndex[node6];
f6._aulPoints[2] = mapNodeIndex[node7];
}
faces.push_back(f1);
faces.push_back(f2);
faces.push_back(f3);
faces.push_back(f4);
faces.push_back(f5);
faces.push_back(f6);
}
else {
Base::Console().Warning("Face with %d nodes ignored\n", aFace->NbNodes());
}
}
// clean up
TopoDS_Shape aNull;
mesh->ShapeToMesh(aNull);
mesh->Clear();
delete mesh;
for (std::list<SMESH_Hypothesis*>::iterator it = hypoth.begin(); it != hypoth.end(); ++it)
delete *it;
MeshCore::MeshKernel kernel;
kernel.Adopt(verts, faces, true);
Mesh::MeshObject* meshdata = new Mesh::MeshObject();
meshdata->swap(kernel);
return meshdata;
#endif // HAVE_SMESH
}
