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27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class file
30 //
31 //
32 // File name: G4EmBiasingManager
33 //
34 // Author: Vladimir Ivanchenko
35 //
36 // Creation date: 28.07.2011
37 //
38 // Modifications:
39 //
40 // 31-05-12 D. Sawkey put back in high energy limit for brem, russian roulette
41 // 30-05-12 D. Sawkey brem split gammas are unique; do weight tests for
42 // brem, russian roulette
43 // -------------------------------------------------------------------
44 //
45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
47
48 #include "G4EmBiasingManager.hh"
49 #include "G4SystemOfUnits.hh"
50 #include "G4PhysicalConstants.hh"
51 #include "G4MaterialCutsCouple.hh"
52 #include "G4ProductionCutsTable.hh"
53 #include "G4ProductionCuts.hh"
54 #include "G4Region.hh"
55 #include "G4RegionStore.hh"
56 #include "G4Track.hh"
57 #include "G4Electron.hh"
58 #include "G4Gamma.hh"
59 #include "G4VEmModel.hh"
60 #include "G4LossTableManager.hh"
61 #include "G4ParticleChangeForLoss.hh"
62 #include "G4ParticleChangeForGamma.hh"
63 #include "G4EmParameters.hh"
64
65 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
66
67 G4EmBiasingManager::G4EmBiasingManager()
68 : fDirectionalSplittingTarget(0.0,0.0,0.0)
69 {
70 fSafetyMin = 1.e-6*mm;
71 theElectron = G4Electron::Electron();
72 theGamma = G4Gamma::Gamma();
73 }
74
75 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
76
77 G4EmBiasingManager::~G4EmBiasingManager() = default;
78
79 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
80
81 void G4EmBiasingManager::Initialise(const G4ParticleDefinition& part,
82 const G4String& procName, G4int verbose)
83 {
84 //G4cout << "G4EmBiasingManager::Initialise for "
85 // << part.GetParticleName()
86 // << " and " << procName << G4endl;
87 const G4ProductionCutsTable* theCoupleTable=
88 G4ProductionCutsTable::GetProductionCutsTable();
89 G4int numOfCouples = (G4int)theCoupleTable->GetTableSize();
90
91 if(0 < nForcedRegions) { idxForcedCouple.resize(numOfCouples, -1); }
92 if(0 < nSecBiasedRegions) { idxSecBiasedCouple.resize(numOfCouples, -1); }
93
94 // Deexcitation
95 for (G4int j=0; j<numOfCouples; ++j) {
96 const G4MaterialCutsCouple* couple =
97 theCoupleTable->GetMaterialCutsCouple(j);
98 const G4ProductionCuts* pcuts = couple->GetProductionCuts();
99 if(0 < nForcedRegions) {
100 for(G4int i=0; i<nForcedRegions; ++i) {
101 if(forcedRegions[i]) {
102 if(pcuts == forcedRegions[i]->GetProductionCuts()) {
103 idxForcedCouple[j] = i;
104 break;
105 }
106 }
107 }
108 }
109 if(0 < nSecBiasedRegions) {
110 for(G4int i=0; i<nSecBiasedRegions; ++i) {
111 if(secBiasedRegions[i]) {
112 if(pcuts == secBiasedRegions[i]->GetProductionCuts()) {
113 idxSecBiasedCouple[j] = i;
114 break;
115 }
116 }
117 }
118 }
119 }
120
121 G4EmParameters* param = G4EmParameters::Instance();
122 SetDirectionalSplitting(param->GetDirectionalSplitting());
123 if (fDirectionalSplitting) {
124 SetDirectionalSplittingTarget(param->GetDirectionalSplittingTarget());
125 SetDirectionalSplittingRadius(param->GetDirectionalSplittingRadius());
126 }
127
128 if (nForcedRegions > 0 && 0 < verbose) {
129 G4cout << " Forced Interaction is activated for "
130 << part.GetParticleName() << " and "
131 << procName
132 << " inside G4Regions: " << G4endl;
133 for (G4int i=0; i<nForcedRegions; ++i) {
134 const G4Region* r = forcedRegions[i];
135 if(r) { G4cout << " " << r->GetName() << G4endl; }
136 }
137 }
138 if (nSecBiasedRegions > 0 && 0 < verbose) {
139 G4cout << " Secondary biasing is activated for "
140 << part.GetParticleName() << " and "
141 << procName
142 << " inside G4Regions: " << G4endl;
143 for (G4int i=0; i<nSecBiasedRegions; ++i) {
144 const G4Region* r = secBiasedRegions[i];
145 if(r) {
146 G4cout << " " << r->GetName()
147 << " BiasingWeight= " << secBiasedWeight[i] << G4endl;
148 }
149 }
150 if (fDirectionalSplitting) {
151 G4cout << " Directional splitting activated, with target position: "
152 << fDirectionalSplittingTarget/cm
153 << " cm; radius: "
154 << fDirectionalSplittingRadius/cm
155 << "cm." << G4endl;
156 }
157 }
158 }
159
160 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
161
162 void G4EmBiasingManager::ActivateForcedInteraction(G4double val,
163 const G4String& rname)
164 {
165 G4RegionStore* regionStore = G4RegionStore::GetInstance();
166 G4String name = rname;
167 if(name == "" || name == "world" || name == "World") {
168 name = "DefaultRegionForTheWorld";
169 }
170 const G4Region* reg = regionStore->GetRegion(name, false);
171 if(!reg) {
172 G4cout << "### G4EmBiasingManager::ForcedInteraction WARNING: "
173 << " G4Region <"
174 << rname << "> is unknown" << G4endl;
175 return;
176 }
177
178 // the region is in the list
179 if (0 < nForcedRegions) {
180 for (G4int i=0; i<nForcedRegions; ++i) {
181 if (reg == forcedRegions[i]) {
182 lengthForRegion[i] = val;
183 return;
184 }
185 }
186 }
187 if(val < 0.0) {
188 G4cout << "### G4EmBiasingManager::ForcedInteraction WARNING: "
189 << val << " < 0.0, so no activation for the G4Region <"
190 << rname << ">" << G4endl;
191 return;
192 }
193
194 // new region
195 forcedRegions.push_back(reg);
196 lengthForRegion.push_back(val);
197 ++nForcedRegions;
198 }
199
200 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
201
202 void
203 G4EmBiasingManager::ActivateSecondaryBiasing(const G4String& rname,
204 G4double factor,
205 G4double energyLimit)
206 {
207 //G4cout << "G4EmBiasingManager::ActivateSecondaryBiasing: "
208 // << rname << " F= " << factor << " E(MeV)= " << energyLimit/MeV
209 // << G4endl;
210 G4RegionStore* regionStore = G4RegionStore::GetInstance();
211 G4String name = rname;
212 if(name == "" || name == "world" || name == "World") {
213 name = "DefaultRegionForTheWorld";
214 }
215 const G4Region* reg = regionStore->GetRegion(name, false);
216 if(!reg) {
217 G4cout << "### G4EmBiasingManager::ActivateBremsstrahlungSplitting "
218 << "WARNING: G4Region <"
219 << rname << "> is unknown" << G4endl;
220 return;
221 }
222
223 // Range cut
224 G4int nsplit = 0;
225 G4double w = factor;
226
227 // splitting
228 if(factor >= 1.0) {
229 nsplit = G4lrint(factor);
230 w = 1.0/G4double(nsplit);
231
232 // Russian roulette
233 } else if(0.0 < factor) {
234 nsplit = 1;
235 w = 1.0/factor;
236 }
237
238 // the region is in the list - overwrite parameters
239 if (0 < nSecBiasedRegions) {
240 for (G4int i=0; i<nSecBiasedRegions; ++i) {
241 if (reg == secBiasedRegions[i]) {
242 secBiasedWeight[i] = w;
243 nBremSplitting[i] = nsplit;
244 secBiasedEnegryLimit[i] = energyLimit;
245 return;
246 }
247 }
248 }
249 /*
250 G4cout << "### G4EmBiasingManager::ActivateSecondaryBiasing: "
251 << " nsplit= " << nsplit << " for the G4Region <"
252 << rname << ">" << G4endl;
253 */
254
255 // new region
256 secBiasedRegions.push_back(reg);
257 secBiasedWeight.push_back(w);
258 nBremSplitting.push_back(nsplit);
259 secBiasedEnegryLimit.push_back(energyLimit);
260 ++nSecBiasedRegions;
261 //G4cout << "nSecBiasedRegions= " << nSecBiasedRegions << G4endl;
262 }
263
264 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
265
266 G4double G4EmBiasingManager::GetStepLimit(G4int coupleIdx,
267 G4double previousStep)
268 {
269 if(startTracking) {
270 startTracking = false;
271 G4int i = idxForcedCouple[coupleIdx];
272 if(i < 0) {
273 currentStepLimit = DBL_MAX;
274 } else {
275 currentStepLimit = lengthForRegion[i];
276 if(currentStepLimit > 0.0) { currentStepLimit *= G4UniformRand(); }
277 }
278 } else {
279 currentStepLimit -= previousStep;
280 }
281 if(currentStepLimit < 0.0) { currentStepLimit = 0.0; }
282 return currentStepLimit;
283 }
284
285 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
286
287 G4double
288 G4EmBiasingManager::ApplySecondaryBiasing(
289 std::vector<G4DynamicParticle*>& vd,
290 const G4Track& track,
291 G4VEmModel* currentModel,
292 G4ParticleChangeForLoss* pPartChange,
293 G4double& eloss,
294 G4int coupleIdx,
295 G4double tcut,
296 G4double safety)
297 {
298 G4int index = idxSecBiasedCouple[coupleIdx];
299 G4double weight = 1.;
300 if(0 <= index) {
301 std::size_t n = vd.size();
302
303 // the check cannot be applied per secondary particle
304 // because weight correction is common, so the first
305 // secondary is checked
306 if((0 < n && vd[0]->GetKineticEnergy() < secBiasedEnegryLimit[index])
307 || fDirectionalSplitting) {
308
309 G4int nsplit = nBremSplitting[index];
310
311 // Range cut
312 if(0 == nsplit) {
313 if(safety > fSafetyMin) { ApplyRangeCut(vd, track, eloss, safety); }
314
315 // Russian Roulette
316 } else if(1 == nsplit) {
317 weight = ApplyRussianRoulette(vd, index);
318
319 // Splitting
320 } else {
321 if (fDirectionalSplitting) {
322 weight = ApplyDirectionalSplitting(vd, track, currentModel, index, tcut);
323 } else {
324 G4double tmpEnergy = pPartChange->GetProposedKineticEnergy();
325 G4ThreeVector tmpMomDir = pPartChange->GetProposedMomentumDirection();
326
327 weight = ApplySplitting(vd, track, currentModel, index, tcut);
328
329 pPartChange->SetProposedKineticEnergy(tmpEnergy);
330 pPartChange->ProposeMomentumDirection(tmpMomDir);
331 }
332 }
333 }
334 }
335 return weight;
336 }
337
338 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
339
340 G4double
341 G4EmBiasingManager::ApplySecondaryBiasing(
342 std::vector<G4DynamicParticle*>& vd,
343 const G4Track& track,
344 G4VEmModel* currentModel,
345 G4ParticleChangeForGamma* pPartChange,
346 G4double& eloss,
347 G4int coupleIdx,
348 G4double tcut,
349 G4double safety)
350 {
351 G4int index = idxSecBiasedCouple[coupleIdx];
352 G4double weight = 1.;
353 if(0 <= index) {
354 std::size_t n = vd.size();
355
356 // the check cannot be applied per secondary particle
357 // because weight correction is common, so the first
358 // secondary is checked
359 if((0 < n && vd[0]->GetKineticEnergy() < secBiasedEnegryLimit[index])
360 || fDirectionalSplitting) {
361
362 G4int nsplit = nBremSplitting[index];
363
364 // Range cut
365 if(0 == nsplit) {
366 if(safety > fSafetyMin) { ApplyRangeCut(vd, track, eloss, safety); }
367
368 // Russian Roulette
369 } else if(1 == nsplit) {
370 weight = ApplyRussianRoulette(vd, index);
371
372 // Splitting
373 } else {
374 if (fDirectionalSplitting) {
375 weight = ApplyDirectionalSplitting(vd, track, currentModel,
376 index, tcut, pPartChange);
377 } else {
378 G4double tmpEnergy = pPartChange->GetProposedKineticEnergy();
379 G4ThreeVector tmpMomDir = pPartChange->GetProposedMomentumDirection();
380
381 weight = ApplySplitting(vd, track, currentModel, index, tcut);
382
383 pPartChange->SetProposedKineticEnergy(tmpEnergy);
384 pPartChange->ProposeMomentumDirection(tmpMomDir);
385 }
386 }
387 }
388 }
389 return weight;
390 }
391
392 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
393
394 G4double
395 G4EmBiasingManager::ApplySecondaryBiasing(std::vector<G4Track*>& track,
396 G4int coupleIdx)
397 {
398 G4int index = idxSecBiasedCouple[coupleIdx];
399 G4double weight = 1.;
400 if(0 <= index) {
401 std::size_t n = track.size();
402
403 // the check cannot be applied per secondary particle
404 // because weight correction is common, so the first
405 // secondary is checked
406 if(0 < n && track[0]->GetKineticEnergy() < secBiasedEnegryLimit[index]) {
407
408 G4int nsplit = nBremSplitting[index];
409
410 // Russian Roulette only
411 if(1 == nsplit) {
412 weight = secBiasedWeight[index];
413 for(std::size_t k=0; k<n; ++k) {
414 if(G4UniformRand()*weight > 1.0) {
415 const G4Track* t = track[k];
416 delete t;
417 track[k] = nullptr;
418 }
419 }
420 }
421 }
422 }
423 return weight;
424 }
425
426 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
427
428 void
429 G4EmBiasingManager::ApplyRangeCut(std::vector<G4DynamicParticle*>& vd,
430 const G4Track& track,
431 G4double& eloss, G4double safety)
432 {
433 std::size_t n = vd.size();
434 if(!eIonisation) {
435 eIonisation =
436 G4LossTableManager::Instance()->GetEnergyLossProcess(theElectron);
437 }
438 if(eIonisation) {
439 for(std::size_t k=0; k<n; ++k) {
440 const G4DynamicParticle* dp = vd[k];
441 if(dp->GetDefinition() == theElectron) {
442 G4double e = dp->GetKineticEnergy();
443 if(eIonisation->GetRange(e, track.GetMaterialCutsCouple()) < safety) {
444 eloss += e;
445 delete dp;
446 vd[k] = nullptr;
447 }
448 }
449 }
450 }
451 }
452
453 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
454
455 G4bool G4EmBiasingManager::CheckDirection(G4ThreeVector pos,
456 G4ThreeVector momdir) const
457 {
458 G4ThreeVector delta = fDirectionalSplittingTarget - pos;
459 G4double angle = momdir.angle(delta);
460 G4double dist = delta.cross(momdir).mag();
461 if (dist <= fDirectionalSplittingRadius && angle < halfpi) {
462 return true;
463 }
464 return false;
465 }
466
467 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
468
469 G4double
470 G4EmBiasingManager::ApplySplitting(std::vector<G4DynamicParticle*>& vd,
471 const G4Track& track,
472 G4VEmModel* currentModel,
473 G4int index,
474 G4double tcut)
475 {
476 // method is applied only if 1 secondary created PostStep
477 // in the case of many secondaries there is a contradiction
478 G4double weight = 1.;
479 std::size_t n = vd.size();
480 G4double w = secBiasedWeight[index];
481
482 if(1 != n || 1.0 <= w) { return weight; }
483
484 G4double trackWeight = track.GetWeight();
485 const G4DynamicParticle* dynParticle = track.GetDynamicParticle();
486
487 G4int nsplit = nBremSplitting[index];
488
489 // double splitting is suppressed
490 if(1 < nsplit && trackWeight>w) {
491
492 weight = w;
493 if(nsplit > (G4int)tmpSecondaries.size()) {
494 tmpSecondaries.reserve(nsplit);
495 }
496 const G4MaterialCutsCouple* couple = track.GetMaterialCutsCouple();
497 // start from 1, because already one secondary created
498 for(G4int k=1; k<nsplit; ++k) {
499 tmpSecondaries.clear();
500 currentModel->SampleSecondaries(&tmpSecondaries, couple, dynParticle,
501 tcut);
502 for (std::size_t kk=0; kk<tmpSecondaries.size(); ++kk) {
503 vd.push_back(tmpSecondaries[kk]);
504 }
505 }
506 }
507 return weight;
508 }
509
510 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
511
512 G4double
513 G4EmBiasingManager::ApplyDirectionalSplitting(
514 std::vector<G4DynamicParticle*>& vd,
515 const G4Track& track,
516 G4VEmModel* currentModel,
517 G4int index,
518 G4double tcut,
519 G4ParticleChangeForGamma* partChange)
520 {
521 // primary is gamma. do splitting/RR as appropriate
522 // method applied for any number of secondaries
523
524 G4double weight = 1.0;
525 G4double w = secBiasedWeight[index];
526
527 fDirectionalSplittingWeights.clear();
528 if(1.0 <= w) {
529 fDirectionalSplittingWeights.push_back(weight);
530 return weight;
531 }
532
533 G4double trackWeight = track.GetWeight();
534 G4int nsplit = nBremSplitting[index];
535
536 // double splitting is suppressed
537 if(1 < nsplit && trackWeight>w) {
538
539 weight = w;
540 const G4ThreeVector pos = track.GetPosition();
541
542 G4bool foundPrimaryParticle = false;
543 G4double primaryEnergy = 0.;
544 G4ThreeVector primaryMomdir(0.,0.,0.);
545 G4double primaryWeight = trackWeight;
546
547 tmpSecondaries = vd;
548 vd.clear();
549 vd.reserve(nsplit);
550 for (G4int k=0; k<nsplit; ++k) {
551 if (k>0) { // for k==0, SampleSecondaries has already been called
552 tmpSecondaries.clear();
553 // SampleSecondaries modifies primary info stored in partChange
554 currentModel->SampleSecondaries(&tmpSecondaries,
555 track.GetMaterialCutsCouple(),
556 track.GetDynamicParticle(), tcut);
557 }
558 for (std::size_t kk=0; kk<tmpSecondaries.size(); ++kk) {
559 if (tmpSecondaries[kk]->GetParticleDefinition() == theGamma) {
560 if (CheckDirection(pos, tmpSecondaries[kk]->GetMomentumDirection())){
561 vd.push_back(tmpSecondaries[kk]);
562 fDirectionalSplittingWeights.push_back(1.);
563 } else if (G4UniformRand() < w) {
564 vd.push_back(tmpSecondaries[kk]);
565 fDirectionalSplittingWeights.push_back(1./weight);
566 } else {
567 delete tmpSecondaries[kk];
568 tmpSecondaries[kk] = nullptr;
569 }
570 } else if (k==0) { // keep charged 2ry from first splitting
571 vd.push_back(tmpSecondaries[kk]);
572 fDirectionalSplittingWeights.push_back(1./weight);
573 } else {
574 delete tmpSecondaries[kk];
575 tmpSecondaries[kk] = nullptr;
576 }
577 }
578
579 // primary
580 G4double en = partChange->GetProposedKineticEnergy();
581 if (en>0.) { // don't add if kinetic energy = 0
582 G4ThreeVector momdir = partChange->GetProposedMomentumDirection();
583 if (CheckDirection(pos,momdir)) {
584 // keep only one primary; others are secondaries
585 if (!foundPrimaryParticle) {
586 primaryEnergy = en;
587 primaryMomdir = momdir;
588 foundPrimaryParticle = true;
589 primaryWeight = weight;
590 } else {
591 auto dp = new G4DynamicParticle(theGamma,
592 partChange->GetProposedMomentumDirection(),
593 partChange->GetProposedKineticEnergy());
594 vd.push_back(dp);
595 fDirectionalSplittingWeights.push_back(1.);
596 }
597 } else if (G4UniformRand()<w) { // not going to target. play RR.
598 if (!foundPrimaryParticle) {
599 foundPrimaryParticle = true;
600 primaryEnergy = en;
601 primaryMomdir = momdir;
602 primaryWeight = 1.;
603 } else {
604 auto dp = new G4DynamicParticle(theGamma,
605 partChange->GetProposedMomentumDirection(),
606 partChange->GetProposedKineticEnergy());
607 vd.push_back(dp);
608 fDirectionalSplittingWeights.push_back(1./weight);
609 }
610 }
611 }
612 } // end of loop over nsplit
613
614 partChange->ProposeWeight(primaryWeight);
615 partChange->SetProposedKineticEnergy(primaryEnergy);
616 partChange->ProposeMomentumDirection(primaryMomdir);
617 } else {
618 for (std::size_t i = 0; i < vd.size(); ++i) {
619 fDirectionalSplittingWeights.push_back(1.);
620 }
621 }
622
623 return weight;
624 }
625
626 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
627
628 G4double G4EmBiasingManager::GetWeight(G4int i)
629 {
630 // normally return 1. If a directionally split particle survives RR,
631 // return 1./(splitting factor)
632 if (fDirectionalSplittingWeights.size() >= (unsigned int)(i+1) ) {
633 G4double w = fDirectionalSplittingWeights[i];
634 fDirectionalSplittingWeights[i] = 1.; // ensure it's not used again
635 return w;
636 } else {
637 return 1.;
638 }
639 }
640
641 G4double
642 G4EmBiasingManager::ApplyDirectionalSplitting(
643 std::vector<G4DynamicParticle*>& vd,
644 const G4Track& track,
645 G4VEmModel* currentModel,
646 G4int index,
647 G4double tcut)
648 {
649 // primary is not a gamma. Do nothing with primary
650
651 G4double weight = 1.0;
652 G4double w = secBiasedWeight[index];
653
654 fDirectionalSplittingWeights.clear();
655 if(1.0 <= w) {
656 fDirectionalSplittingWeights.push_back(weight);
657 return weight;
658 }
659
660 G4double trackWeight = track.GetWeight();
661 G4int nsplit = nBremSplitting[index];
662
663 // double splitting is suppressed
664 if(1 < nsplit && trackWeight>w) {
665
666 weight = w;
667 const G4ThreeVector pos = track.GetPosition();
668
669 tmpSecondaries = vd;
670 vd.clear();
671 vd.reserve(nsplit);
672 for (G4int k=0; k<nsplit; ++k) {
673 if (k>0) {
674 tmpSecondaries.clear();
675 currentModel->SampleSecondaries(&tmpSecondaries,
676 track.GetMaterialCutsCouple(),
677 track.GetDynamicParticle(), tcut);
678 }
679 //for (auto sec : tmpSecondaries) {
680 for (std::size_t kk=0; kk < tmpSecondaries.size(); ++kk) {
681 if (CheckDirection(pos, tmpSecondaries[kk]->GetMomentumDirection())) {
682 vd.push_back(tmpSecondaries[kk]);
683 fDirectionalSplittingWeights.push_back(1.);
684 } else if (G4UniformRand()<w) {
685 vd.push_back(tmpSecondaries[kk]);
686 fDirectionalSplittingWeights.push_back(1./weight);
687 } else {
688 delete tmpSecondaries[kk];
689 tmpSecondaries[kk] = nullptr;
690 }
691 }
692 } // end of loop over nsplit
693 } else { // no splitting was done; still need weights
694 for (std::size_t i = 0; i < vd.size(); ++i) {
695 fDirectionalSplittingWeights.push_back(1.0);
696 }
697 }
698 return weight;
699 }
700