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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2025 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
\*---------------------------------------------------------------------------*/
#include "OBJsurfaceFormat.H"
#include "clock.H"
#include "IFstream.H"
#include "IStringStream.H"
#include "Ostream.H"
#include "OFstream.H"
#include "ListOps.H"
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
template<class Face>
Foam::fileFormats::OBJsurfaceFormat<Face>::OBJsurfaceFormat
(
const fileName& filename
)
{
read(filename);
}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
template<class Face>
bool Foam::fileFormats::OBJsurfaceFormat<Face>::read
(
const fileName& filename
)
{
const bool mustTriangulate = this->isTri();
this->clear();
IFstream is(filename);
if (!is.good())
{
FatalErrorInFunction
<< "Cannot read file " << filename
<< exit(FatalError);
}
// assume that the groups are not intermixed
bool sorted = true;
DynamicList<point> dynPoints;
DynamicList<Face> dynFaces;
DynamicList<label> dynZones;
DynamicList<word> dynNames;
DynamicList<label> dynSizes;
HashTable<label> lookup;
// place faces without a group in zone0
label zoneI = 0;
lookup.insert("zone0", zoneI);
dynNames.append("zone0");
dynSizes.append(0);
while (is.good())
{
const string line = this->getLineNoComment(is);
// Read first word
IStringStream lineStream(line);
word cmd;
lineStream >> cmd;
if (cmd == "v")
{
scalar x, y, z;
lineStream >> x >> y >> z;
dynPoints.append(point(x, y, z));
}
else if (cmd == "g")
{
word name;
lineStream >> name;
HashTable<label>::const_iterator fnd = lookup.find(name);
if (fnd != lookup.end())
{
if (zoneI != fnd())
{
// group appeared out of order
sorted = false;
}
zoneI = fnd();
}
else
{
zoneI = dynSizes.size();
lookup.insert(name, zoneI);
dynNames.append(name);
dynSizes.append(0);
}
}
else if (cmd == "f")
{
DynamicList<label> dynVertices;
// Assume 'f' is followed by space.
string::size_type endNum = 1;
while (true)
{
string::size_type startNum =
line.find_first_not_of(' ', endNum);
if (startNum == string::npos)
{
break;
}
endNum = line.find(' ', startNum);
string vertexSpec;
if (endNum != string::npos)
{
vertexSpec = line.substr(startNum, endNum-startNum);
}
else
{
vertexSpec = line.substr(startNum, line.size() - startNum);
}
string::size_type slashPos = vertexSpec.find('/');
label vertI = 0;
if (slashPos != string::npos)
{
IStringStream intStream(vertexSpec.substr(0, slashPos));
intStream >> vertI;
}
else
{
IStringStream intStream(vertexSpec);
intStream >> vertI;
}
dynVertices.append(vertI - 1);
}
dynVertices.shrink();
labelUList& f = static_cast<labelUList&>(dynVertices);
if (mustTriangulate && f.size() > 3)
{
// simple face triangulation about f[0]
// points may be incomplete
for (label fp1 = 1; fp1 < f.size() - 1; fp1++)
{
label fp2 = f.fcIndex(fp1);
dynFaces.append(triFace(f[0], f[fp1], f[fp2]));
dynZones.append(zoneI);
dynSizes[zoneI]++;
}
}
else
{
dynFaces.append(Face(f));
dynZones.append(zoneI);
dynSizes[zoneI]++;
}
}
}
// transfer to normal lists
this->storedPoints().transfer(dynPoints);
this->sortFacesAndStore(move(dynFaces), move(dynZones), sorted);
// add zones, culling empty ones
this->addZones(dynSizes, dynNames, true);
return true;
}
template<class Face>
void Foam::fileFormats::OBJsurfaceFormat<Face>::write
(
const fileName& filename,
const MeshedSurfaceProxy<Face>& surf
)
{
const pointField& pointLst = surf.points();
const List<Face>& faceLst = surf.faces();
const List<label>& faceMap = surf.faceMap();
// for no zones, suppress the group name
const List<surfZone>& zones =
(
surf.surfZones().empty()
? surfaceFormatsCore::oneZone(faceLst, "")
: surf.surfZones()
);
const bool useFaceMap = (surf.useFaceMap() && zones.size() > 1);
OFstream os(filename);
if (!os.good())
{
FatalErrorInFunction
<< "Cannot open file for writing " << filename
<< exit(FatalError);
}
os << "# Wavefront OBJ file written " << clock::dateTime().c_str() << nl
<< "o " << os.name().lessExt().name() << nl
<< nl
<< "# points : " << pointLst.size() << nl
<< "# faces : " << faceLst.size() << nl
<< "# zones : " << zones.size() << nl;
// Print zone names as comment
forAll(zones, zoneI)
{
os << "# " << zoneI << " " << zones[zoneI].name()
<< " (nFaces: " << zones[zoneI].size() << ")" << nl;
}
os << nl
<< "# <points count=\"" << pointLst.size() << "\">" << nl;
// Write vertex coords
forAll(pointLst, ptI)
{
const point& pt = pointLst[ptI];
os << "v " << pt.x() << ' ' << pt.y() << ' ' << pt.z() << nl;
}
os << "# </points>" << nl
<< nl
<< "# <faces count=\"" << faceLst.size() << "\">" << endl;
label faceIndex = 0;
forAll(zones, zoneI)
{
const surfZone& zone = zones[zoneI];
if (zone.name().size())
{
os << "g " << zone.name() << endl;
}
if (useFaceMap)
{
forAll(zone, localFacei)
{
const Face& f = faceLst[faceMap[faceIndex++]];
os << 'f';
forAll(f, fp)
{
os << ' ' << f[fp] + 1;
}
os << endl;
}
}
else
{
forAll(zone, localFacei)
{
const Face& f = faceLst[faceIndex++];
os << 'f';
forAll(f, fp)
{
os << ' ' << f[fp] + 1;
}
os << endl;
}
}
}
os << "# </faces>" << endl;
}
// ************************************************************************* //
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