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#include <regex>
#include <meshing.hpp>
#include "rw_medit.hpp"
namespace netgen
{
void ReadMeditFormat (Mesh & mesh, const filesystem::path & filename, map<tuple<int,int>, int> & index_map)
{
static Timer tall("ReadMeditMesh"); RegionTimer rtall(tall);
if(!filesystem::exists(filename))
throw Exception("File does not exist: " + filename.string());
auto fin = ifstream(filename);
string token;
int version, dim;
mesh.ClearFaceDescriptors();
int index_cnt[4] = {0,0,0,0};
auto getIndex = [&](int eldim, int index) {
if(index_map.count({eldim,index})==0) {
auto n = ++index_cnt[eldim];
index_map[{eldim, index}] = n;
if(eldim==2) {
auto fd = FaceDescriptor(n-1,1,0,0);
fd.SetBCProperty(n);
mesh.AddFaceDescriptor (fd);
}
}
return index_map[{eldim, index}];
};
while(true) {
fin >> token;
int index;
// cout << "token: " << token << endl;
if(token == "End") {
break;
}
else if(token == "" || std::regex_match(token, std::regex("^[\\s]*$"))) {
continue;
}
else if(token == "MeshVersionFormatted") {
fin >> version;
}
else if(token == "Dimension") {
fin >> dim;
mesh.SetDimension(dim);
}
else if(token == "Vertices") {
int nvert;
fin >> nvert;
Point<3> p{0.,0.,0.};
for([[maybe_unused]] auto k : Range(nvert)) {
for(auto i : Range(dim))
fin >> p[i];
fin >> index;
mesh.AddPoint(p);
}
}
else if(token == "Edges") {
int nedge;
fin >> nedge;
Segment seg;
for([[maybe_unused]] auto k : Range(nedge)) {
for(auto i : Range(2))
fin >> seg[i];
fin >> seg.edgenr;
seg.edgenr = getIndex(1, seg.edgenr);
seg.si = seg.edgenr;
mesh.AddSegment(seg);
}
}
else if(token == "Triangles") {
int ntrig, index;
fin >> ntrig;
Element2d sel;
for([[maybe_unused]] auto k : Range(ntrig)) {
for(auto i : Range(3))
fin >> sel[i];
fin >> index;
sel.SetIndex(getIndex(2, index));
mesh.AddSurfaceElement(sel);
}
}
else if(token == "Tetrahedra") {
int ntet;
fin >> ntet;
Element el(4);
for([[maybe_unused]] auto k : Range(ntet)) {
for(auto i : Range(4))
fin >> el[i];
fin >> index;
el.SetIndex(getIndex(3, index));
el.Invert();
mesh.AddVolumeElement(el);
}
}
else if(token == "Corners") {
int ncorners;
fin >> ncorners;
Element0d el;
for([[maybe_unused]] auto k : Range(ncorners)) {
fin >> el.pnum;
}
}
else if(token == "RequiredVertices") {
int nverts;
fin >> nverts;
int vert;
for([[maybe_unused]] auto k : Range(nverts)) {
fin >> vert;
}
}
else if(token == "Normals") {
int nnormals;
fin >> nnormals;
Vec<3> normal;
for([[maybe_unused]] auto k : Range(nnormals)) {
fin >> normal[0];
fin >> normal[1];
fin >> normal[2];
}
}
else if(token == "NormalAtVertices") {
int nnormals;
fin >> nnormals;
int vert;
int normal;
for([[maybe_unused]] auto k : Range(nnormals)) {
fin >> normal;
fin >> vert;
}
}
else if(token == "Tangents") {
int ntangents;
fin >> ntangents;
Vec<3> tangent;
for([[maybe_unused]] auto k : Range(ntangents)) {
fin >> tangent[0];
fin >> tangent[1];
fin >> tangent[2];
}
}
else if(token == "TangentAtVertices") {
int ntangents;
fin >> ntangents;
int vert;
int tangent;
for([[maybe_unused]] auto k : Range(ntangents)) {
fin >> tangent;
fin >> vert;
}
}
else if(token == "Ridges") {
int nridges;
fin >> nridges;
int ridge;
for([[maybe_unused]] auto k : Range(nridges)) {
fin >> ridge;
}
}
else {
cout << "unknown token " << token << endl;
int nitems;
fin >> nitems;
string s;
for([[maybe_unused]] auto i : Range(nitems))
fin >> s; // read one line
}
}
}
void ReadMeditFormat (Mesh & mesh, const filesystem::path & filename)
{
map<tuple<int, int>, int> index_map;
ReadMeditFormat(mesh, filename, index_map);
}
void WriteMeditFormat (const Mesh & mesh, const filesystem::path & filename, map<tuple<int,int>, int> & index_map)
{
static Timer tall("WriteMeditFormat"); RegionTimer rtall(tall);
auto fout = ofstream(filename);
fout << "MeshVersionFormatted 2\n";
fout << "Dimension\n" << mesh.GetDimension() << endl;
fout << "Vertices\n" << mesh.GetNP() << endl;
int base_index = 0;
int max_index = 0;
auto getIndex = [&](int i, int dim) {
max_index = max(max_index, i+base_index);
auto index = base_index+i;
index_map[{dim,i}] = index;
return index;
};
fout << setprecision(16);
for(const auto & p : mesh.Points())
{
for(auto i : Range(mesh.GetDimension()))
fout << p[i] << ' ';
fout << getIndex(1, 0) << endl;
}
base_index = max_index;
fout << "Edges\n" << mesh.GetNSeg() << endl;
for(const auto & seg : mesh.LineSegments())
fout << seg[0] << ' ' << seg[1] << ' ' << getIndex(seg.edgenr, 1) << endl;
base_index = max_index;
fout << "Triangles\n" << mesh.GetNSE() << endl;
for(const auto & sel : mesh.SurfaceElements())
fout << sel[0] << ' ' << sel[1] << ' ' << sel[2] << ' ' << getIndex(sel.GetIndex(), 2) << endl;
base_index = max_index;
fout << "Tetrahedra\n" << mesh.GetNE() << endl;
for(const auto & el : mesh.VolumeElements())
fout << el[0] << ' ' << el[1] << ' ' << el[2] << ' ' << el[3] << '\t' << getIndex(el.GetIndex(), 3) << endl;
fout << "End" << endl;
}
void WriteMeditFormat (const Mesh & mesh, const filesystem::path & filename)
{
map<tuple<int,int>, int> index_map;
WriteMeditFormat(mesh, filename, index_map);
}
static RegisterUserFormat reg_medit ("Medit Format", {".mesh"},
static_cast<void(*)(Mesh &, const filesystem::path&)>(ReadMeditFormat),
static_cast<void(*)(const Mesh &, const filesystem::path&)>(WriteMeditFormat));
} // namespace netgen
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