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FindElementOfPoint<1> for 2d meshes for curved segments

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This commit is contained in:
Christopher Lackner 2021-03-23 15:08:20 +01:00
parent ab4359c343
commit a612444e77
4 changed files with 57 additions and 2 deletions
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9
libsrc/interface/nginterface_v2.cpp
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@ -1035,6 +1035,14 @@ namespace netgen
case 2:
{
Point<3> p(hp[0], hp[1],0);
try
{
auto ind = mesh->GetSurfaceElementOfPoint(p, lami, nullptr,
build_searchtree);
return ind - 1;
}
catch(NgException e) // quads not implemented curved yet
{
for (SegmentIndex si = 0; si < mesh->GetNSeg(); si++)
{
auto & seg = (*mesh)[si];
@ -1058,6 +1066,7 @@ namespace netgen
return si;
}
}
}
}
break;
case 3:

43
libsrc/meshing/meshclass.cpp
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@ -5268,7 +5268,7 @@ namespace netgen
//(*testout) << "col1 " << col1 << " col2 " << col2 << " col3 " << col3 << " rhs " << rhs << endl;
//(*testout) << "sol " << sol << endl;
if (SurfaceElement(element).GetType() ==TRIG6)
if (SurfaceElement(element).GetType() ==TRIG6 || curvedelems->IsSurfaceElementCurved(element-1))
{
netgen::Point<2> lam(1./3,1./3);
Vec<3> rhs;
@ -5679,6 +5679,47 @@ namespace netgen
{
if (dimension == 2)
{
double vlam[3];
int velement = GetElementOfPoint(p, vlam, NULL, build_searchtree, allowindex);
if(velement == 0)
return 0;
vlam[2] = 1.-vlam[0] - vlam[1];
NgArray<int> edges;
topology.GetSurfaceElementEdges(velement, edges);
Array<SegmentIndex> segs(edges.Size());
for(auto i : Range(edges))
segs[i] = topology.GetSegmentOfEdge(edges[i]);
for(auto i : Range(segs))
{
if(IsInvalid(segs[i]))
continue;
auto& el = SurfaceElement(velement);
if(el.GetType() == TRIG)
{
double seg_lam;
double lam;
auto seg = LineSegment(segs[i]);
for(auto k : Range(3))
{
if(seg[0] == el[k])
lam = vlam[k];
if(seg[1] == el[k])
seg_lam = vlam[k];
}
if(1.- seg_lam - lam < 1e-5)
{
// found point close to segment -> use barycentric coordinates directly
lami[0] = lam;
return int(segs[i])+1;
}
}
else
throw NgException("Quad not implemented yet!");
}
return 0;
throw NgException("GetSurfaceElementOfPoint not yet implemented for 2D meshes");
}
else

4
libsrc/meshing/topology.cpp
View File

@ -620,7 +620,8 @@ namespace netgen
ned += hv;
}
edge2vert.SetSize(ned);
edge2segment.SetSize(ned);
edge2segment = -1;
// INDEX_CLOSED_HASHTABLE<int> v2eht(2*max_edge_on_vertex+10);
// NgArray<int> vertex2;
@ -689,6 +690,7 @@ namespace netgen
break;
case 1:
segedges[elnr].nr = edgenum;
edge2segment[edgenum] = elnr;
// segedges[elnr].orient = edgedir;
break;
}

3
libsrc/meshing/topology.hpp
View File

@ -63,6 +63,7 @@ class MeshTopology
NgArray<T_FACE> surffaces;
NgArray<INDEX_2> surf2volelement;
NgArray<int> face2surfel;
Array<SegmentIndex> edge2segment;
TABLE<ElementIndex,PointIndex::BASE> vert2element;
TABLE<SurfaceElementIndex,PointIndex::BASE> vert2surfelement;
TABLE<SegmentIndex,PointIndex::BASE> vert2segment;
@ -170,6 +171,8 @@ public:
int GetFace2SurfaceElement (int fnr) const { return face2surfel[fnr-1]; }
SegmentIndex GetSegmentOfEdge(int edgenr) const { return edge2segment[edgenr-1]; }
void GetVertexElements (int vnr, NgArray<ElementIndex> & elements) const;
NgFlatArray<ElementIndex> GetVertexElements (int vnr) const
{ return vert2element[vnr]; }