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vtkPolyDataBooleanFilter.cxx
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/*
Copyright 2012-2025 Ronald Römer
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include <map>
#include <deque>
#include <vector>
#include <set>
#include <algorithm>
#include <cmath>
#include <functional>
#include <queue>
#include <memory>
#include <tuple>
#include <chrono>
#include <numeric>
#include <iterator>
#include <vtkInformation.h>
#include <vtkInformationVector.h>
#include <vtkDemandDrivenPipeline.h>
#include <vtkObjectFactory.h>
#include <vtkPolyDataAlgorithm.h>
#include <vtkCellData.h>
#include <vtkPointData.h>
#include <vtkMath.h>
#include <vtkIdList.h>
#include <vtkAppendPolyData.h>
#include <vtkKdTreePointLocator.h>
#include <vtkCleanPolyData.h>
#include <vtkPolyDataConnectivityFilter.h>
#include <vtkSmartPointer.h>
#include <vtkModifiedBSPTree.h>
#include <vtkCellArrayIterator.h>
#include <vtkKdTree.h>
#include <vtkCellIterator.h>
#include "vtkPolyDataBooleanFilter.h"
#include "vtkPolyDataContactFilter.h"
#include "Utilities.h"
vtkStandardNewMacro(vtkPolyDataBooleanFilter);
vtkPolyDataBooleanFilter::vtkPolyDataBooleanFilter () {
SetNumberOfInputPorts(2);
SetNumberOfOutputPorts(3);
timePdA = 0;
timePdB = 0;
contLines = vtkSmartPointer<vtkPolyData>::New();
modPdA = vtkSmartPointer<vtkPolyData>::New();
modPdB = vtkSmartPointer<vtkPolyData>::New();
cellDataA = vtkSmartPointer<vtkCellData>::New();
cellDataB = vtkSmartPointer<vtkCellData>::New();
cellIdsA = vtkSmartPointer<vtkIdTypeArray>::New();
cellIdsB = vtkSmartPointer<vtkIdTypeArray>::New();
OperMode = OPER_UNION;
}
vtkPolyDataBooleanFilter::~vtkPolyDataBooleanFilter () {
// nix mehr
}
int vtkPolyDataBooleanFilter::RequestData(vtkInformation *request, vtkInformationVector **inputVector, vtkInformationVector *outputVector) {
if (request->Has(vtkDemandDrivenPipeline::REQUEST_DATA())) {
vtkInformation *inInfoA = inputVector[0]->GetInformationObject(0);
vtkInformation *inInfoB = inputVector[1]->GetInformationObject(0);
vtkPolyData *pdA = vtkPolyData::SafeDownCast(inInfoA->Get(vtkDataObject::DATA_OBJECT()));
vtkPolyData *pdB = vtkPolyData::SafeDownCast(inInfoB->Get(vtkDataObject::DATA_OBJECT()));
vtkInformation *outInfoA = outputVector->GetInformationObject(0);
vtkInformation *outInfoB = outputVector->GetInformationObject(1);
vtkInformation *outInfoC = outputVector->GetInformationObject(2);
resultA = vtkPolyData::SafeDownCast(outInfoA->Get(vtkDataObject::DATA_OBJECT()));
resultB = vtkPolyData::SafeDownCast(outInfoB->Get(vtkDataObject::DATA_OBJECT()));
resultC = vtkPolyData::SafeDownCast(outInfoC->Get(vtkDataObject::DATA_OBJECT()));
using clock = std::chrono::steady_clock;
std::vector<clock::duration> times;
clock::time_point start;
if (pdA->GetMTime() > timePdA || pdB->GetMTime() > timePdB) {
// eventuell vorhandene regionen vereinen
auto cleanA = vtkSmartPointer<vtkCleanPolyData>::New();
cleanA->SetOutputPointsPrecision(DOUBLE_PRECISION);
cleanA->SetTolerance(1e-6);
cleanA->SetInputData(pdA);
cleanA->Update();
auto cleanB = vtkSmartPointer<vtkCleanPolyData>::New();
cleanB->SetOutputPointsPrecision(DOUBLE_PRECISION);
cleanB->SetTolerance(1e-6);
cleanB->SetInputData(pdB);
cleanB->Update();
#ifdef DEBUG
std::cout << "Exporting modPdA.vtk" << std::endl;
WriteVTK("modPdA.vtk", cleanA->GetOutput());
std::cout << "Exporting modPdB.vtk" << std::endl;
WriteVTK("modPdB.vtk", cleanB->GetOutput());
#endif
// CellData sichern
cellDataA->DeepCopy(cleanA->GetOutput()->GetCellData());
cellDataB->DeepCopy(cleanB->GetOutput()->GetCellData());
// ermittelt kontaktstellen
start = clock::now();
auto cl = vtkSmartPointer<vtkPolyDataContactFilter>::New();
cl->SetInputConnection(0, cleanA->GetOutputPort());
cl->SetInputConnection(1, cleanB->GetOutputPort());
cl->Update();
times.push_back(clock::now()-start);
contLines->DeepCopy(cl->GetOutput());
modPdA->DeepCopy(cl->GetOutput(1));
modPdB->DeepCopy(cl->GetOutput(2));
modPdA->EditableOn();
modPdB->EditableOn();
#ifdef DEBUG
std::cout << "Exporting contLines.vtk" << std::endl;
WriteVTK("contLines.vtk", contLines);
std::cout << "Exporting modPdA_1.vtk" << std::endl;
WriteVTK("modPdA_1.vtk", modPdA);
std::cout << "Exporting modPdB_1.vtk" << std::endl;
WriteVTK("modPdB_1.vtk", modPdB);
#endif
if (contLines->GetNumberOfCells() == 0) {
return 1;
}
// in den CellDatas steht drin, welche polygone einander schneiden
contsA = vtkIdTypeArray::SafeDownCast(contLines->GetCellData()->GetScalars("cA"));
contsB = vtkIdTypeArray::SafeDownCast(contLines->GetCellData()->GetScalars("cB"));
vtkIdTypeArray *sourcesA = vtkIdTypeArray::SafeDownCast(contLines->GetCellData()->GetScalars("sourcesA"));
vtkIdTypeArray *sourcesB = vtkIdTypeArray::SafeDownCast(contLines->GetCellData()->GetScalars("sourcesB"));
vtkIdType i, numPts = contLines->GetNumberOfPoints();
auto cells = vtkSmartPointer<vtkIdList>::New();
bool hasGap(false);
for (i = 0; i < numPts; i++) {
contLines->GetPointCells(i, cells);
if (cells->GetNumberOfIds() == 1) {
vtkErrorMacro("Contact ends suddenly at point " << i << ".");
hasGap = true;
}
}
if (hasGap) {
return 1;
}
// sichert die OrigCellIds
vtkIdTypeArray *origCellIdsA = vtkIdTypeArray::SafeDownCast(modPdA->GetCellData()->GetScalars("OrigCellIds"));
vtkIdTypeArray *origCellIdsB = vtkIdTypeArray::SafeDownCast(modPdB->GetCellData()->GetScalars("OrigCellIds"));
cellIdsA->DeepCopy(origCellIdsA);
cellIdsB->DeepCopy(origCellIdsB);
vtkIdType numCellsA = modPdA->GetNumberOfCells(),
numCellsB = modPdB->GetNumberOfCells();
for (i = 0; i < numCellsA; i++) {
origCellIdsA->SetValue(i, i);
}
for (i = 0; i < numCellsB; i++) {
origCellIdsB->SetValue(i, i);
}
start = clock::now();
if (GetPolyStrips(modPdA, contsA, sourcesA, polyStripsA) ||
GetPolyStrips(modPdB, contsB, sourcesB, polyStripsB)) {
vtkErrorMacro("Strips are invalid.");
return 1;
}
// löscht bestimmte strips
if (CleanStrips()) {
vtkErrorMacro("There is no contact.");
return 1;
}
times.push_back(clock::now()-start);
// trennt die polygone an den linien
start = clock::now();
if (CutCells(modPdA, polyStripsA) ||
CutCells(modPdB, polyStripsB)) {
vtkErrorMacro("CutCells failed.");
return 1;
}
times.push_back(clock::now()-start);
#ifdef DEBUG
std::cout << "Exporting modPdA_2.vtk" << std::endl;
WriteVTK("modPdA_2.vtk", modPdA);
std::cout << "Exporting modPdB_2.vtk" << std::endl;
WriteVTK("modPdB_2.vtk", modPdB);
#endif
start = clock::now();
RestoreOrigPoints(modPdA, polyStripsA);
RestoreOrigPoints(modPdB, polyStripsB);
times.push_back(clock::now()-start);
#ifdef DEBUG
std::cout << "Exporting modPdA_3.vtk" << std::endl;
WriteVTK("modPdA_3.vtk", modPdA);
std::cout << "Exporting modPdB_3.vtk" << std::endl;
WriteVTK("modPdB_3.vtk", modPdB);
#endif
start = clock::now();
ResolveOverlaps(modPdA, polyStripsA);
ResolveOverlaps(modPdB, polyStripsB);
times.push_back(clock::now()-start);
#ifdef DEBUG
std::cout << "Exporting modPdA_4.vtk" << std::endl;
WriteVTK("modPdA_4.vtk", modPdA);
std::cout << "Exporting modPdB_4.vtk" << std::endl;
WriteVTK("modPdB_4.vtk", modPdB);
#endif
start = clock::now();
AddAdjacentPoints(modPdA, contsA, polyStripsA);
AddAdjacentPoints(modPdB, contsB, polyStripsB);
times.push_back(clock::now()-start);
#ifdef DEBUG
std::cout << "Exporting modPdA_5.vtk" << std::endl;
WriteVTK("modPdA_5.vtk", modPdA);
std::cout << "Exporting modPdB_5.vtk" << std::endl;
WriteVTK("modPdB_5.vtk", modPdB);
#endif
start = clock::now();
DisjoinPolys(modPdA, polyStripsA);
DisjoinPolys(modPdB, polyStripsB);
times.push_back(clock::now()-start);
#ifdef DEBUG
std::cout << "Exporting modPdA_6.vtk" << std::endl;
WriteVTK("modPdA_6.vtk", modPdA);
std::cout << "Exporting modPdB_6.vtk" << std::endl;
WriteVTK("modPdB_6.vtk", modPdB);
#endif
start = clock::now();
MergePoints(modPdA, polyStripsA);
MergePoints(modPdB, polyStripsB);
times.push_back(clock::now()-start);
#ifdef DEBUG
std::cout << "Exporting modPdA_7.vtk" << std::endl;
WriteVTK("modPdA_7.vtk", modPdA);
std::cout << "Exporting modPdB_7.vtk" << std::endl;
WriteVTK("modPdB_7.vtk", modPdB);
#endif
timePdA = pdA->GetMTime();
timePdB = pdB->GetMTime();
}
start = clock::now();
if (CombineRegions()) {
vtkErrorMacro("Boolean operation failed.");
return 1;
}
times.push_back(clock::now()-start);
#ifdef DEBUG
double sum = std::chrono::duration_cast<std::chrono::duration<double>>(std::accumulate(times.begin(), times.end(), clock::duration())).count();
std::vector<clock::duration>::const_iterator itr;
for (itr = times.begin(); itr != times.end(); itr++) {
double time = std::chrono::duration_cast<std::chrono::duration<double>>(*itr).count();
std::cout << "Time " << (itr-times.begin())
<< ": " << time << "s (" << (time/sum*100) << "%)"
<< std::endl;
}
#endif
}
return 1;
}
void vtkPolyDataBooleanFilter::GetStripPoints (vtkPolyData *pd, vtkIdTypeArray *sources, PStrips &pStrips, IdsType &lines) {
#ifdef DEBUG
std::cout << "GetStripPoints()" << std::endl;
#endif
StripPtsType &pts = pStrips.pts;
const IdsType &poly = pStrips.poly;
double a[3], b[3], sA[3], sB[3], u[3], v[3], w[3], n, t, d;
std::map<vtkIdType, vtkIdType> allPts;
std::map<vtkIdType, vtkIdType> links;
auto line = vtkSmartPointer<vtkIdList>::New();
for (auto lineId : lines) {
contLines->GetCellPoints(lineId, line);
// std::cout << "? " << contsA->GetValue(lineId)
// << ", " << contsB->GetValue(lineId)
// << ", [" << line->GetId(0)
// << ", " << line->GetId(1)
// << "]"
// << std::endl;
allPts.emplace(line->GetId(0), sources->GetTypedComponent(lineId, 0));
allPts.emplace(line->GetId(1), sources->GetTypedComponent(lineId, 1));
links[line->GetId(0)]++;
links[line->GetId(1)]++;
}
decltype(allPts)::const_iterator itr;
for (itr = allPts.begin(); itr != allPts.end(); ++itr) {
StripPt sp;
sp.ind = itr->first;
// die koordinaten
contLines->GetPoint(sp.ind, sp.pt);
IdsType::const_iterator itrA, itrB;
for (itrA = poly.begin(); itrA != poly.end(); ++itrA) {
itrB = itrA+1;
if (itrB == poly.end()) {
itrB = poly.begin();
}
if (itr->second != NOTSET && *itrA != itr->second) {
continue;
}
pd->GetPoint(*itrA, a);
pd->GetPoint(*itrB, b);
vtkMath::Subtract(a, sp.pt, sA);
vtkMath::Subtract(b, sp.pt, sB);
// richtungsvektor und länge der kante
vtkMath::Subtract(b, a, u);
n = vtkMath::Norm(u);
// d und t zur kante
vtkMath::Subtract(sp.pt, a, v);
t = vtkMath::Dot(v, u)/(n*n);
vtkMath::Cross(v, u, w);
d = vtkMath::Norm(w)/n;
if (d < 1e-5 && t > -1e-5 && t < 1+1e-5) {
sp.edge[0] = *itrA;
sp.edge[1] = *itrB;
sp.t = std::min(1., std::max(0., t));
if (vtkMath::Norm(sA) < 1e-5) {
Cpy(sp.captPt, a, 3);
sp.capt = Capt::A;
} else if (vtkMath::Norm(sB) < 1e-5) {
Cpy(sp.captPt, b, 3);
sp.capt = Capt::B;
} else {
// u ist nicht normiert
vtkMath::MultiplyScalar(u, t);
double x[3];
vtkMath::Add(a, u, x);
// projektion
Cpy(sp.captPt, x, 3);
sp.capt = Capt::EDGE;
}
}
// std::cout << "? "
// << sp.ind
// << ", " << d
// << ", " << t
// << ", " << sp.capt
// << std::endl;
}
if (itr->second != NOTSET && sp.edge[0] == NOTSET) {
sp.catched = false;
}
if (sp.capt == Capt::NOT && links[sp.ind] > 2) {
sp.capt = Capt::BRANCHED;
}
pts.emplace(sp.ind, std::move(sp));
}
StripPtsType::iterator itr2;
for (itr2 = pts.begin(); itr2 != pts.end(); ++itr2) {
StripPt &sp = itr2->second;
if (sp.capt & Capt::BOUNDARY) {
if (sp.capt == Capt::B) {
sp.t = 0;
sp.edge[0] = sp.edge[1];
auto itrA = std::find(poly.begin(), poly.end(), sp.edge[0]),
itrB = itrA+1;
if (itrB == poly.end()) {
itrB = poly.begin();
}
sp.edge[1] = *itrB;
sp.capt = Capt::A;
}
// für den schnitt werden die eingerasteten koordinaten verwendet
Cpy(sp.cutPt, sp.captPt, 3);
} else {
Cpy(sp.cutPt, sp.pt, 3);
}
}
#ifdef DEBUG
for (itr2 = pts.begin(); itr2 != pts.end(); ++itr2) {
std::cout << itr2->first << ": " << itr2->second << std::endl;
}
#endif
}
bool vtkPolyDataBooleanFilter::GetPolyStrips (vtkPolyData *pd, vtkIdTypeArray *conts, vtkIdTypeArray *sources, PolyStripsType &polyStrips) {
#ifdef DEBUG
std::cout << "GetPolyStrips()" << std::endl;
#endif
polyStrips.clear();
std::map<vtkIdType, IdsType> polyLines;
for (vtkIdType i = 0; i < conts->GetNumberOfTuples(); i++) {
vtkIdType poly = conts->GetValue(i);
/*if (poly != 1641) {
continue;
}*/
polyLines[poly].push_back(i);
}
std::vector<std::reference_wrapper<StripPt>> notCatched;
std::map<vtkIdType, IdsType>::iterator itr;
for (itr = polyLines.begin(); itr != polyLines.end(); ++itr) {
IdsType &lines = itr->second;
RemoveDuplicates(lines);
polyStrips.emplace(std::piecewise_construct,
std::forward_as_tuple(itr->first),
std::forward_as_tuple(pd, itr->first));
PStrips &pStrips = polyStrips.at(itr->first);
GetStripPoints(pd, sources, pStrips, lines);
for (auto &sp : pStrips.pts) {
sp.second.polyId = itr->first;
if (!sp.second.catched) {
notCatched.push_back(sp.second);
}
}
}
auto Next = [](const IdsType &ids, vtkIdType id) -> vtkIdType {
IdsType::const_iterator itr;
itr = std::find(ids.begin(), ids.end(), id);
if (++itr == ids.end()) {
itr = ids.begin();
}
return *itr;
};
for (StripPt &sp : notCatched) {
for (itr = polyLines.begin(); itr != polyLines.end(); ++itr) {
const PStrips &pStrips = polyStrips.at(itr->first);
try {
const StripPt &corr = pStrips.pts.at(sp.ind);
if (&corr != &sp) {
if (corr.capt == Capt::A) {
sp.capt = Capt::A;
sp.edge[0] = corr.edge[0];
sp.edge[1] = Next(polyStrips.at(sp.polyId).poly, sp.edge[0]);
sp.t = 0;
Cpy(sp.captPt, corr.captPt, 3);
Cpy(sp.cutPt, sp.captPt, 3);
sp.catched = true;
}
}
} catch (...) {}
}
#ifdef DEBUG
if (!sp.catched) {
std::cout << sp << std::endl;
}
#endif
assert(sp.catched);
}
// sucht nach gleichen captPts
{
// std::map<Point3d, std::map<vtkIdType, std::vector<std::reference_wrapper<StripPt>>>> collapsed;
std::map<Point3d, std::set<vtkIdType>> collapsed;
PolyStripsType::iterator itr;
StripPtsType::iterator itr2;
for (itr = polyStrips.begin(); itr != polyStrips.end(); ++itr) {
PStrips &pStrips = itr->second;
StripPtsType &pts = pStrips.pts;
for (itr2 = pts.begin(); itr2 != pts.end(); ++itr2) {
StripPt &sp = itr2->second;
if (sp.capt & Capt::BOUNDARY) {
// collapsed[{sp.cutPt[0], sp.cutPt[1], sp.cutPt[2]}][sp.ind].push_back(sp);
auto inds = collapsed[{sp.cutPt[0], sp.cutPt[1], sp.cutPt[2]}];
inds.emplace(sp.ind);
if (inds.size() > 1) {
return true;
}
}
}
}
// for (auto &[pt, map] : collapsed) {
// if (map.size() > 1) {
// return true;
// }
// }
}
for (itr = polyLines.begin(); itr != polyLines.end(); ++itr) {
PStrips &pStrips = polyStrips.at(itr->first);
const IdsType &lines = itr->second;
const StripPtsType &pts = pStrips.pts;
StripsType &strips = pStrips.strips;
// zusammensetzen
std::deque<Pair> _lines;
vtkIdList *linePts = vtkIdList::New();
for (auto &i : lines) {
contLines->GetCellPoints(i, linePts);
_lines.emplace_back(linePts->GetId(0), linePts->GetId(1));
}
linePts->Delete();
decltype(_lines)::iterator _itr;
auto FindRight = [&pts, &_lines, &_itr](StripType &strip, const std::size_t &id) -> bool {
auto &right = strip.back();
if (pts.at(right.ind).capt == Capt::NOT) {
for (_itr = _lines.begin(); _itr != _lines.end(); ++_itr) {
if (_itr->f == right.ind) {
strip.emplace_back(_itr->g, id);
_lines.erase(_itr);
return true;
} else if (_itr->g == right.ind) {
strip.emplace_back(_itr->f, id);
_lines.erase(_itr);
return true;
}
}
}
return false;
};
auto FindLeft = [&pts, &_lines, &_itr](StripType &strip, const std::size_t &id) -> bool {
auto &left = strip.front();
if (pts.at(left.ind).capt == Capt::NOT) {
for (_itr = _lines.begin(); _itr != _lines.end(); ++_itr) {
if (_itr->f == left.ind) {
strip.emplace_front(_itr->g, id);
_lines.erase(_itr);
return true;
} else if (_itr->g == left.ind) {
strip.emplace_front(_itr->f, id);
_lines.erase(_itr);
return true;
}
}
}
return false;
};
std::size_t stripId {0};
while (!_lines.empty()) {
auto &last = _lines.back();
StripType strip {{last.f, stripId}, {last.g, stripId}};
_lines.pop_back();
while (FindRight(strip, stripId)) {}
while (FindLeft(strip, stripId)) {}
strips.push_back(std::move(strip));
stripId++;
}
CompleteStrips(pStrips);
}
// sucht nach schnitten zw. den strips
{
PolyStripsType::const_iterator itr;
StripType::const_iterator itr2;
for (itr = polyStrips.begin(); itr != polyStrips.end(); ++itr) {
const PStrips &pStrips = itr->second;
const StripsType &strips = pStrips.strips;
const StripPtsType &pts = pStrips.pts;
const Base &base = pStrips.base;
auto treePts = vtkSmartPointer<vtkPoints>::New();
auto treePd = vtkSmartPointer<vtkPolyData>::New();
treePd->Allocate(1);
std::map<vtkIdType, vtkIdType> ptIds;
double pt[2];
for (const auto &p : pts) {
Transform(p.second.pt, pt, base);
ptIds.emplace(p.first, treePts->InsertNextPoint(pt[0], pt[1], 0));
}
for (const StripType &strip : strips) {
for (itr2 = strip.begin(); itr2 != strip.end()-1; ++itr2) {
vtkIdList *line = vtkIdList::New();
line->InsertNextId(ptIds[itr2->ind]);
line->InsertNextId(ptIds[(itr2+1)->ind]);
treePd->InsertNextCell(VTK_LINE, line);
line->Delete();
}
}
treePd->SetPoints(treePts);
auto tree = vtkSmartPointer<vtkModifiedBSPTree>::New();
tree->SetDataSet(treePd);
tree->BuildLocator();
vtkIdType numA, numB;
const vtkIdType *lineA, *lineB;
auto lineItr = vtk::TakeSmartPointer(treePd->GetLines()->NewIterator());
for (lineItr->GoToFirstCell(); !lineItr->IsDoneWithTraversal(); lineItr->GoToNextCell()) {
lineItr->GetCurrentCell(numA, lineA);
double ptA[3], ptB[3];
treePts->GetPoint(lineA[0], ptA);
treePts->GetPoint(lineA[1], ptB);
auto lineIds = vtkSmartPointer<vtkIdList>::New();
tree->IntersectWithLine(ptA, ptB, 1e-5, nullptr, lineIds);
for (vtkIdType i = 0; i < lineIds->GetNumberOfIds(); i++) {
treePd->GetCellPoints(lineIds->GetId(i), numB, lineB);
if (lineB[0] != lineA[0] && lineB[1] != lineA[0] && lineB[0] != lineA[1] && lineB[1] != lineA[1]) {
// schnitt gefunden
return true;
}
}
}
}
}
return false;
}
void vtkPolyDataBooleanFilter::RemoveDuplicates (IdsType &lines) {
typedef std::tuple<vtkIdType, vtkIdType, vtkIdType> LineType;
std::vector<LineType> _lines;
_lines.reserve(lines.size());
auto line = vtkSmartPointer<vtkIdList>::New();
vtkIdType a, b;
for (const vtkIdType &id : lines) {
contLines->GetCellPoints(id, line);
a = line->GetId(0);
b = line->GetId(1);
if (std::find_if(_lines.begin(), _lines.end(), [&](const LineType &_line) {
return (std::get<1>(_line) == a && std::get<2>(_line) == b)
|| (std::get<1>(_line) == b && std::get<2>(_line) == a);
}) == _lines.end()) {
_lines.emplace_back(id, a, b);
}
}
if (_lines.size() != lines.size()) {
lines.clear();
for (const auto &_line : _lines) {
lines.push_back(std::get<0>(_line));
}
lines.shrink_to_fit();
}
}
void vtkPolyDataBooleanFilter::CompleteStrips (PStrips &pStrips) {
StripsType::iterator itr;
for (itr = pStrips.strips.begin(); itr != pStrips.strips.end(); ++itr) {
const StripPt &start = pStrips.pts[itr->front().ind],
&end = pStrips.pts[itr->back().ind];
if (start.ind != end.ind) {
if (start.capt == Capt::NOT) {
StripType s(itr->rbegin(), itr->rend()-1);
itr->insert(itr->begin(), s.begin(), s.end());
} else if (end.capt == Capt::NOT) {
StripType s(itr->rbegin()+1, itr->rend());
itr->insert(itr->end(), s.begin(), s.end());
}
}
}
}
bool vtkPolyDataBooleanFilter::HasArea (const StripType &strip) const {
bool area = true;
std::size_t i, n = strip.size();
if (n%2 == 1) {
for (i = 0; i < (n-1)/2; i++) {
area = strip[i].ind != strip[n-i-1].ind;
}
}
return area;
}
bool vtkPolyDataBooleanFilter::CleanStrips () {
#ifdef DEBUG
std::cout << "CleanStrips()" << std::endl;
#endif
_IdsType inds;
auto FindHoles = [&](PolyStripsType &polyStrips) {
PolyStripsType::iterator itr;
for (itr = polyStrips.begin(); itr != polyStrips.end(); ++itr) {
PStrips &pStrips = itr->second;
StripsType &strips = pStrips.strips;
StripPtsType &pts = pStrips.pts;
strips.erase(std::remove_if(strips.begin(), strips.end(), [&](const StripType &strip) {
if (pts.at(strip.front().ind).capt == Capt::NOT
&& pts.at(strip.back().ind).capt == Capt::NOT
&& !HasArea(strip)) {
for (const StripPtR &p : strip) {
inds.emplace(p.ind);
}
return true;
}
return false;
}), strips.end());
}
};
FindHoles(polyStripsA);
FindHoles(polyStripsB);
#ifdef DEBUG
std::cout << "inds: [";
for (auto &ind : inds) {
std::cout << ind << ", ";
}
std::cout << "]" << std::endl;
#endif
auto CleanOther = [&](PolyStripsType &polyStrips) {
PolyStripsType::iterator itr;
for (itr = polyStrips.begin(); itr != polyStrips.end(); ++itr) {
PStrips &pStrips = itr->second;
StripsType &strips = pStrips.strips;
strips.erase(std::remove_if(strips.begin(), strips.end(), [&](const StripType &strip) {
auto found = std::find_if(strip.begin(), strip.end(), [&](const StripPtR &p) {
return inds.find(p.ind) != inds.end();
});
return found != strip.end();
}), strips.end());
}
};
CleanOther(polyStripsA);
CleanOther(polyStripsB);
auto lines = vtkSmartPointer<vtkIdList>::New();
vtkIdType i, j, numLines;
for (vtkIdType ind : inds) {
contLines->GetPointCells(ind, lines);
numLines = lines->GetNumberOfIds();
for (i = 0; i < numLines; i++) {
contLines->DeleteCell(lines->GetId(i));
}
}
j = 0;
numLines = contLines->GetNumberOfCells();
for (i = 0; i < numLines; i++) {
if (contLines->GetCellType(i) == VTK_EMPTY_CELL) {
j++;
}
}
if (j == numLines) {
return true;
}
return false;
}