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vtkPolyDataBooleanFilter.cxx
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vtkPolyDataBooleanFilter.cxx
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/*
Copyright 2012-2014 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>
// siehe std::bind
using namespace std::placeholders;
#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 <vtkCell.h>
#include <vtkAppendPolyData.h>
#include <vtkKdTreePointLocator.h>
#include <vtkCleanPolyData.h>
#include <vtkPolyDataConnectivityFilter.h>
#include "vtkPolyDataBooleanFilter.h"
#include "vtkPolyDataContactFilter.h"
#include "GeomHelper.h"
#define CPY(a, b) a[0] = b[0]; a[1] = b[1]; a[2] = b[2];
#ifdef DEBUG
#include <vtkPolyDataWriter.h>
#include <ctime>
#define DIFF(s, e) float(e-s)/CLOCKS_PER_SEC
#include <numeric>
#include <iterator>
#endif
vtkStandardNewMacro(vtkPolyDataBooleanFilter);
vtkPolyDataBooleanFilter::vtkPolyDataBooleanFilter () {
SetNumberOfInputPorts(2);
SetNumberOfOutputPorts(2);
timePdA = 0;
timePdB = 0;
contLines = vtkPolyData::New();
modPdA = vtkPolyData::New();
modPdB = vtkPolyData::New();
cellDataA = vtkCellData::New();
cellDataB = vtkCellData::New();
OperMode = OPER_UNION;
}
vtkPolyDataBooleanFilter::~vtkPolyDataBooleanFilter () {
cellDataB->Delete();
cellDataA->Delete();
modPdB->Delete();
modPdA->Delete();
contLines->Delete();
}
int vtkPolyDataBooleanFilter::ProcessRequest(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);
resultA = vtkPolyData::SafeDownCast(outInfoA->Get(vtkDataObject::DATA_OBJECT()));
resultB = vtkPolyData::SafeDownCast(outInfoB->Get(vtkDataObject::DATA_OBJECT()));
#ifdef DEBUG
std::vector<float> times;
clock_t start;
#endif
if (pdA->GetMTime() > timePdA || pdB->GetMTime() > timePdB) {
// eventuell vorhandene regionen vereinen
vtkCleanPolyData *cleanA = vtkCleanPolyData::New();
#if (VTK_MAJOR_VERSION == 5)
cleanA->SetInput(pdA);
#else
cleanA->SetInputData(pdA);
#endif
cleanA->Update();
vtkCleanPolyData *cleanB = vtkCleanPolyData::New();
#if (VTK_MAJOR_VERSION == 5)
cleanB->SetInput(pdB);
#else
cleanB->SetInputData(pdB);
#endif
cleanB->Update();
#ifdef DEBUG
std::cout << "Exporting modPdA.vtk" << std::endl;
GeomHelper::WriteVTK("modPdA.vtk", cleanA->GetOutput());
std::cout << "Exporting modPdB.vtk" << std::endl;
GeomHelper::WriteVTK("modPdB.vtk", cleanB->GetOutput());
#endif
// CellData sichern
cellDataA->DeepCopy(cleanA->GetOutput()->GetCellData());
cellDataB->DeepCopy(cleanB->GetOutput()->GetCellData());
// ermittelt kontaktstellen
#ifdef DEBUG
start = std::clock();
#endif
vtkPolyDataContactFilter *cl = vtkPolyDataContactFilter::New();
cl->SetInputConnection(0, cleanA->GetOutputPort());
cl->SetInputConnection(1, cleanB->GetOutputPort());
cl->Update();
#ifdef DEBUG
times.push_back(DIFF(start, std::clock()));
#endif
contLines->DeepCopy(cl->GetOutput());
modPdA->DeepCopy(cl->GetOutput(1));
modPdB->DeepCopy(cl->GetOutput(2));
if (contLines->GetNumberOfCells() == 0) {
vtkErrorMacro("Inputs have no contact.");
return 1;
}
// in den CellDatas steht drin, welche polygone einander schneiden
vtkIntArray *contsA = vtkIntArray::SafeDownCast(contLines->GetCellData()->GetScalars("cA"));
vtkIntArray *contsB = vtkIntArray::SafeDownCast(contLines->GetCellData()->GetScalars("cB"));
PolyStripsType polyStripsA(GetPolyStrips(modPdA, contsA));
PolyStripsType polyStripsB(GetPolyStrips(modPdB, contsB));
// polyStripsA/B wird modifiziert
StripsType allStripsA(GetAllStrips(polyStripsA));
StripsType allStripsB(GetAllStrips(polyStripsB));
// trennt die polygone an den linien
#ifdef DEBUG
start = std::clock();
#endif
CutCells(modPdA, polyStripsA);
CutCells(modPdB, polyStripsB);
#ifdef DEBUG
times.push_back(DIFF(start, std::clock()));
#endif
#ifdef DEBUG
std::cout << "Exporting modPdA_2.vtk" << std::endl;
GeomHelper::WriteVTK("modPdA_2.vtk", modPdA);
std::cout << "Exporting modPdB_2.vtk" << std::endl;
GeomHelper::WriteVTK("modPdB_2.vtk", modPdB);
#endif
#ifdef DEBUG
start = std::clock();
#endif
RestoreOrigPoints(modPdA, allStripsA);
RestoreOrigPoints(modPdB, allStripsB);
#ifdef DEBUG
times.push_back(DIFF(start, std::clock()));
#endif
#ifdef DEBUG
std::cout << "Exporting modPdA_3.vtk" << std::endl;
GeomHelper::WriteVTK("modPdA_3.vtk", modPdA);
std::cout << "Exporting modPdB_3.vtk" << std::endl;
GeomHelper::WriteVTK("modPdB_3.vtk", modPdB);
#endif
#ifdef DEBUG
start = std::clock();
#endif
ResolveOverlaps(modPdA, allStripsA, contsA);
ResolveOverlaps(modPdB, allStripsB, contsB);
#ifdef DEBUG
times.push_back(DIFF(start, std::clock()));
#endif
#ifdef DEBUG
std::cout << "Exporting modPdA_4.vtk" << std::endl;
GeomHelper::WriteVTK("modPdA_4.vtk", modPdA);
std::cout << "Exporting modPdB_4.vtk" << std::endl;
GeomHelper::WriteVTK("modPdB_4.vtk", modPdB);
#endif
#ifdef DEBUG
start = std::clock();
#endif
AddAdjacentPoints(modPdA, allStripsA);
AddAdjacentPoints(modPdB, allStripsB);
#ifdef DEBUG
times.push_back(DIFF(start, std::clock()));
#endif
#ifdef DEBUG
std::cout << "Exporting modPdA_5.vtk" << std::endl;
GeomHelper::WriteVTK("modPdA_5.vtk", modPdA);
std::cout << "Exporting modPdB_5.vtk" << std::endl;
GeomHelper::WriteVTK("modPdB_6.vtk", modPdB);
#endif
#ifdef DEBUG
start = std::clock();
#endif
DisjoinPolys(modPdA, allStripsA);
DisjoinPolys(modPdB, allStripsB);
#ifdef DEBUG
times.push_back(DIFF(start, std::clock()));
#endif
#ifdef DEBUG
std::cout << "Exporting modPdA_6.vtk" << std::endl;
GeomHelper::WriteVTK("modPdA_6.vtk", modPdA);
std::cout << "Exporting modPdB_6.vtk" << std::endl;
GeomHelper::WriteVTK("modPdB_6.vtk", modPdB);
#endif
#ifdef DEBUG
start = std::clock();
#endif
MergePoints(modPdA, allStripsA);
MergePoints(modPdB, allStripsB);
#ifdef DEBUG
times.push_back(DIFF(start, std::clock()));
#endif
#ifdef DEBUG
std::cout << "Exporting modPdA_7.vtk" << std::endl;
GeomHelper::WriteVTK("modPdA_7.vtk", modPdA);
std::cout << "Exporting modPdB_7.vtk" << std::endl;
GeomHelper::WriteVTK("modPdB_7.vtk", modPdB);
#endif
// aufräumen
cl->Delete();
cleanB->Delete();
cleanA->Delete();
timePdA = pdA->GetMTime();
timePdB = pdB->GetMTime();
}
#ifdef DEBUG
start = std::clock();
#endif
CombineRegions();
#ifdef DEBUG
times.push_back(DIFF(start, std::clock()));
float sum = std::accumulate(times.begin(), times.end(), 0.);
std::vector<float>::const_iterator itr;
for (itr = times.cbegin(); itr != times.cend(); itr++) {
std::cout << "Time " << std::distance(times.cbegin(), itr)
<< ": " << *itr << " (" << (*itr/sum)*100 << "%)"
<< std::endl;
}
#endif
}
return 1;
}
StripPointsType vtkPolyDataBooleanFilter::GetStripPoints(vtkPolyData *pd, int polyInd, std::deque<int> &lines) {
#ifdef DEBUG
std::cout << "GetStripPoints()"
<< std::endl << "polyInd " << polyInd << std::endl;
#endif
StripPointsType stripPts;
// aus folgenden ecken setzt sich das polygon zusammen
vtkIdList *polyPts = vtkIdList::New();
pd->GetCellPoints(polyInd, polyPts);
RemoveDuplicates(contLines, lines);
std::deque<int>::const_iterator itr;
for (itr = lines.begin(); itr != lines.end(); itr++) {
// def. der linie
vtkIdList *linePts = vtkIdList::New();
contLines->GetCellPoints(*itr, linePts);
// diese punkte durchlaufen
for (unsigned int i = 0; i < 2; i++) {
int realInd = linePts->GetId(i);
if (stripPts.count(realInd) == 0) {
// lage analysieren
stripPts[realInd].ind = realInd;
// die koordinaten
double pt[3];
contLines->GetPoint(realInd, pt);
CPY(stripPts[realInd].pt, pt)
double nSum = 0;
double currD = 1e-5;
// jetzt muss man die kanten durchlaufen
for (unsigned int j = 0; j < polyPts->GetNumberOfIds(); j++) {
int indA, indB;
double a[3], b[3];
indA = polyPts->GetId(j);
indB = polyPts->GetId((j+1)%polyPts->GetNumberOfIds());
pd->GetPoint(indA, a);
pd->GetPoint(indB, b);
double sA[3], sB[3];
vtkMath::Subtract(a, pt, sA);
vtkMath::Subtract(b, pt, sB);
// richtungsvektor und länge der kante
double u[3];
vtkMath::Subtract(b, a, u);
double n = vtkMath::Norm(u);
// d und t zur kante
double v[3];
vtkMath::Subtract(pt, a, v);
double t = vtkMath::Dot(v, u)/(n*n);
double w[3];
vtkMath::Cross(v, u, w);
double d = vtkMath::Norm(w)/n;
// t ist bis hier eine fraktion von n
t *= n;
if (d < currD && t > -1e-5 && t < n+1e-5) {
// liegt im toleranzbereich der kante
stripPts[realInd].edgeA = indA;
stripPts[realInd].edgeB = indB;
stripPts[realInd].T = nSum;
stripPts[realInd].t = std::min(n, std::max(0., t));
if (vtkMath::Norm(sA) < 1e-5) {
CPY(stripPts[realInd].captPt, a)
stripPts[realInd].capt = CAPT_A;
} else if (vtkMath::Norm(sB) < 1e-5) {
CPY(stripPts[realInd].captPt, b)
stripPts[realInd].capt = CAPT_B;
} else {
// u ist nicht normiert
vtkMath::MultiplyScalar(u, t/n);
double x[3];
vtkMath::Add(a, u, x);
// projektion
CPY(stripPts[realInd].captPt, x)
stripPts[realInd].capt = CAPT_EDGE;
}
#ifdef DEBUG
std::cout << "ind " << realInd
<< ", indA " << indA
<< ", d " << d << std::endl;
#endif
currD = d;
}
nSum += n;
}
}
}
// jetzt kommt die entscheidende sache
double tol = .996195; // 5deg
StripPtType &spA = stripPts[linePts->GetId(0)];
StripPtType &spB = stripPts[linePts->GetId(1)];
if (spA.capt != CAPT_NOT && spB.capt != CAPT_NOT) {
double vA[3], vB[3];
vtkMath::Subtract(spB.pt, spA.pt, vA);
vtkMath::Subtract(spB.captPt, spA.pt, vB);
vtkMath::Normalize(vA);
vtkMath::Normalize(vB);
double ang = vtkMath::Dot(vA, vB);
if (ang < tol) {
locked.push_back(spB.ind);
}
// anders kombiniert
vtkMath::Subtract(spA.pt, spB.pt, vA);
vtkMath::Subtract(spA.captPt, spB.pt, vB);
vtkMath::Normalize(vA);
vtkMath::Normalize(vB);
ang = vtkMath::Dot(vA, vB);
if (ang < tol) {
locked.push_back(spA.ind);
}
}
linePts->Delete();
}
polyPts->Delete();
#ifdef DEBUG
std::cout << "stripPts:" << std::endl;
std::map<int, StripPtType>::const_iterator itr2;
for (itr2 = stripPts.begin(); itr2 != stripPts.end(); itr2++) {
std::cout << "ind " << itr2->second.ind
<< ", edgeA " << itr2->second.edgeA
<< ", edgeB " << itr2->second.edgeB
<< ", T " << itr2->second.T
<< ", t " << itr2->second.t
<< ", capt " << itr2->second.capt
<< std::endl;
}
#endif
return stripPts;
}
PolyStripsType vtkPolyDataBooleanFilter::GetPolyStrips (vtkPolyData *pd, vtkIntArray *conts) {
#ifdef DEBUG
std::cout << "GetPolyStrips()" << std::endl;
#endif
std::map<int, StripsType> polyStrips;
std::map<int, std::deque<int> > polyLines;
if (conts != NULL) {
for (int i = 0; i < conts->GetNumberOfTuples(); i++) {
int poly = conts->GetValue(i);
polyLines[poly].push_back(i);
}
}
std::map<int, StripPointsType> polyPts;
std::map<int, std::deque<int> >::iterator itr;
for (itr = polyLines.begin(); itr != polyLines.end(); itr++) {
polyPts[itr->first] = GetStripPoints(pd, itr->first, itr->second);
}
std::map<int, StripPointsType>::iterator itr2;
StripPointsType::iterator itr3;
for (itr2 = polyPts.begin(); itr2 != polyPts.end(); itr2++) {
StripPointsType &stripPts = itr2->second;
for (itr3 = stripPts.begin(); itr3 != stripPts.end(); itr3++) {
StripPtType &sp = itr3->second;
if (sp.capt != CAPT_NOT) {
if (std::count(locked.begin(), locked.end(), sp.ind) > 0) { // wenn unter den gesperrten
if (sp.capt == CAPT_EDGE) {
// CAPT_EDGE -> CAPT_NONE
sp.T = sp.t = 0;
sp.edgeA = sp.edgeB = -1;
sp.capt = CAPT_NOT;
CPY(sp.cutPt, sp.pt)
} else {
// CAPT_A/B -> CAPT_EDGE
double a[3], b[3], c[3];
pd->GetPoint(sp.edgeA, a);
pd->GetPoint(sp.edgeB, b);
vtkMath::Subtract(b, a, c);
vtkMath::MultiplyScalar(c, sp.t/vtkMath::Norm(c));
// projektion
vtkMath::Add(a, c, sp.captPt);
sp.capt = CAPT_EDGE;
CPY(sp.cutPt, sp.captPt)
}
} else {
if (sp.capt == CAPT_A) {
sp.t = 0;
sp.edgeB = -1;
sp.onEnd = true;
} else if (sp.capt == CAPT_B) {
sp.t = 0;
double endA[3], endB[3];
pd->GetPoint(sp.edgeA, endA);
pd->GetPoint(sp.edgeB, endB);
double l[3];
vtkMath::Subtract(endA, endB, l);
sp.T += vtkMath::Norm(l);
sp.edgeA = sp.edgeB;
sp.edgeB = -1;
sp.onEnd = true;
sp.capt = CAPT_A;
}
// für den schnitt werden die eingerasteten koordinaten verwendet
CPY(sp.cutPt, sp.captPt)
}
}
CPY(sp.cutPt, sp.pt)
}
// zusammensetzen
std::deque<int> &lines = polyLines[itr2->first];
StripsType &strips = polyStrips[itr2->first];
StripType strip;
int i = 0;
while (lines.size() > 0) {
vtkIdList *linePts = vtkIdList::New();
contLines->GetCellPoints(lines[i], linePts);
int indA = linePts->GetId(0);
int indB = linePts->GetId(1);
if (strip.empty()) {
strip.push_back(stripPts[indA]);
strip.push_back(stripPts[indB]);
lines.erase(lines.begin());
} else {
if (strip.back().capt == CAPT_NOT && strip.back().ind == indA) {
strip.push_back(stripPts[indB]);
lines.erase(lines.begin()+i);
i = 0;
} else if (strip.back().capt == CAPT_NOT && strip.back().ind == indB) {
strip.push_back(stripPts[indA]);
lines.erase(lines.begin()+i);
i = 0;
} else if (strip.front().capt == CAPT_NOT && strip.front().ind == indA) {
strip.push_front(stripPts[indB]);
lines.erase(lines.begin()+i);
i = 0;
} else if (strip.front().capt == CAPT_NOT && strip.front().ind == indB) {
strip.push_front(stripPts[indA]);
lines.erase(lines.begin()+i);
i = 0;
} else {
i++;
}
}
// ein strip ist abgeschlossen, wenn beide enden auf kanten liegen
// oder wenn beide enden gleich sind (strip bildet ein eigenens polygon)
if ((strip.front().capt != CAPT_NOT && strip.back().capt != CAPT_NOT)
|| (strip.front().ind == strip.back().ind)
|| (i == lines.size())) {
// den strip nach dem T+t sortieren
if ((strip.front().T+strip.front().t) > (strip.back().T+strip.back().t)) {
std::reverse(strip.begin(), strip.end());
}
// einen neuen strip anlegen
strips.push_back(strip);
strip.clear();
i = 0;
}
linePts->Delete();
}
CompleteStrips(strips);
}
#ifdef DEBUG
std::vector<int>::const_iterator itr4;
std::cout << "locked [";
for (itr4 = locked.begin(); itr4 != locked.end(); itr4++) {
std::cout << *itr4 << ", ";
}
std::cout << "]" << std::endl;
#endif
// für den durchlauf mit modPdB
locked.clear();
return polyStrips;
}
StripsType vtkPolyDataBooleanFilter::GetAllStrips (PolyStripsType &polyStrips) {
StripsType all;
PolyStripsType::const_iterator itr;
for (itr = polyStrips.begin(); itr != polyStrips.end(); itr++) {
all.insert(all.end(), itr->second.begin(), itr->second.end());
}
return all;
}
bool vtkPolyDataBooleanFilter::SortFct (const StripType &stripA, const StripType &stripB, double *n) {
if (stripA.front().ind != stripB.front().ind) {
return (stripA.front().T+stripA.front().t) < (stripB.front().T+stripB.front().t);
} else {
// in umgekehrter reihenfolge
if (stripA.back().ind != stripB.back().ind) {
return (stripA.back().T+stripA.back().t) > (stripB.back().T+stripB.back().t);
} else {
// anfang und ende sind gleich
// hier muss man mit der normale arbeiten
vtkPoints *pts = vtkPoints::New();
vtkIdList *poly = vtkIdList::New();
StripType::const_iterator itr;
for (itr = stripA.begin(); itr != stripA.end(); itr++) {
poly->InsertNextId(pts->InsertNextPoint(itr->pt));
}
StripType::const_reverse_iterator itr2;
for (itr2 = stripB.rbegin()+1; itr2 != stripB.rend()-1; itr2++) {
poly->InsertNextId(pts->InsertNextPoint(itr2->pt));
}
double s[3];
GeomHelper::ComputeNormal(pts, poly, s);
// diese normale muss man jetzt mit der normale des polygons vergleichen in dem der strip liegt
double ang = vtkMath::Dot(n, s);
poly->Delete();
pts->Delete();
return ang < 0;
}
}
}
void vtkPolyDataBooleanFilter::CutCells (vtkPolyData *pd, PolyStripsType &polyStrips) {
#ifdef DEBUG
std::cout << "CutCells()" << std::endl;
#endif
vtkPoints *pdPts = pd->GetPoints();
vtkIntArray *origCellIds = vtkIntArray::SafeDownCast(pd->GetCellData()->GetScalars("OrigCellIds"));
std::vector<int> toRemove;
std::map<int, StripsType>::iterator itr;
for (itr = polyStrips.begin(); itr != polyStrips.end(); itr++) {
// die zu teilenden polygone
std::deque<int> polys;
polys.push_back(itr->first);
// die normale des polygons wird benötigt
vtkIdList *orig = vtkIdList::New();
pd->GetCellPoints(itr->first, orig);
double n[3];
GeomHelper::ComputeNormal(pd->GetPoints(), orig, n);
orig->Delete();
#ifdef DEBUG
std::cout << "orig " << itr->first << std::endl;
#endif
StripsType &strips = itr->second;
// sortieren der strips mit einer speziellen funktion
// bindet die normale an die SortFct, sodass die funktion die geforderten zwei argument besitzt
std::function<bool(const StripType&, const StripType&)> _SortFct = std::bind(vtkPolyDataBooleanFilter::SortFct, _1, _2, n);
std::sort(strips.begin(), strips.end(), _SortFct);
StripsType::iterator itr2;
for (itr2 = strips.begin(); itr2 != strips.end(); itr2++) {
#ifdef DEBUG
std::cout << "strip:" << std::endl
<< "pos " << itr2->front().pos
<< std::endl;
#endif
// map für die ecken die ersetzt werden müssen
std::map<int, ReplsType> R;
int Q = -1;
if (itr2->front().capt == CAPT_NOT && itr2->back().capt == CAPT_NOT) {
// der strip bildet ein polygon im inneren
#ifdef DEBUG
std::cout << "is a hole" << std::endl;
#endif
continue;
}
int cycle = 0;
while (true) {
if (cycle == polys.size()) {
// es wurde ein fall nicht berücksichtigt ...
break;
}
int polyInd = polys.front();
polys.pop_front();
vtkIdList *poly = vtkIdList::New();
pd->GetCellPoints(polyInd, poly);
#ifdef DEBUG
std::cout << "polyInd " << polyInd << ", poly [";
for (unsigned int i = 0; i < poly->GetNumberOfIds(); i++) {
std::cout << poly->GetId(i) << ", ";
}
std::cout << "]" << std::endl;
#endif
// zwei neue polygone
vtkIdList *newPolyA = vtkIdList::New();
vtkIdList *newPolyB = vtkIdList::New();
if (itr2->front().edgeA == itr2->back().edgeA) {
#ifdef DEBUG
std::cout << "case 1" << std::endl;
#endif
// der strip bildet ein eigenständiges polygon auf einer kante
for (unsigned int i = 0; i < poly->GetNumberOfIds(); i++) {
int ptInd = poly->GetId(i);
if (ptInd == itr2->front().edgeA) {
if (!itr2->front().onEnd) {
newPolyA->InsertNextId(ptInd);
}
// den strip einfügen
StripType::iterator itr3;
for (itr3 = itr2->begin(); itr3 != itr2->end(); itr3++) {
// einen neuen punkt erzeugen
newPolyA->InsertNextId(pdPts->InsertNextPoint(itr3->cutPt));
}
// dann das eigenständige polygon bestehend aus dem strip
StripType::reverse_iterator itr4;
for (itr4 = itr2->rbegin(); itr4 != itr2->rend(); itr4++) {
newPolyB->InsertNextId(pdPts->InsertNextPoint(itr4->cutPt));
}
// eine neue referenz hinzufügen
R[ptInd].push_back(std::make_pair(itr2->front().t, newPolyB->GetId(newPolyB->GetNumberOfIds()-1)));
R[ptInd].push_back(std::make_pair(itr2->back().t, newPolyA->GetId(newPolyA->GetNumberOfIds()-1)));
} else {
newPolyA->InsertNextId(ptInd);
}
}
} else {
#ifdef DEBUG
std::cout << "case 2" << std::endl;
#endif
vtkIdList *actPoly = newPolyA;
// kanten durchlaufen
int refs[] = {-1, -1};
for (unsigned int i = 0; i < poly->GetNumberOfIds(); i++) {
int ptInd = poly->GetId(i);
if (ptInd == itr2->front().edgeA) {
// den strip einfügen
if (!itr2->front().onEnd) {
actPoly->InsertNextId(ptInd);
}
StripType::iterator itr3;
for (itr3 = itr2->begin(); itr3 != itr2->end(); itr3++) {
// einen neuen punkt erzeugen
actPoly->InsertNextId(pdPts->InsertNextPoint(itr3->cutPt));
}
R[ptInd].push_back(std::make_pair(itr2->front().t, actPoly->GetId(actPoly->GetNumberOfIds()-1)));
refs[0] = ptInd;
actPoly = (actPoly == newPolyA) ? newPolyB : newPolyA;
} else if (ptInd == itr2->back().edgeA) {
if (!itr2->back().onEnd) {
actPoly->InsertNextId(ptInd);
}
StripType::reverse_iterator itr3;
for (itr3 = itr2->rbegin(); itr3 != itr2->rend(); itr3++) {
actPoly->InsertNextId(pdPts->InsertNextPoint(itr3->cutPt));
}
R[ptInd].push_back(std::make_pair(itr2->back().t, actPoly->GetId(actPoly->GetNumberOfIds()-1)));
refs[1] = ptInd;