source: trunk/source/geometry/navigation/src/G4MultiLevelLocator.cc@ 1177

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25//
26// $Id: G4MultiLevelLocator.cc,v 1.5 2008/12/11 10:01:02 tnikitin Exp $
27// GEANT4 tag $Name: geant4-09-03-beta-cand-01 $
28//
29// Class G4MultiLevelLocator implementation
30//
31// 27.10.08 - Tatiana Nikitina.
32// ---------------------------------------------------------------------------
33
34#include <iomanip>
35
36#include "G4ios.hh"
37#include "G4MultiLevelLocator.hh"
38
39G4MultiLevelLocator::G4MultiLevelLocator(G4Navigator *theNavigator)
40 : G4VIntersectionLocator(theNavigator)
41{
42 // In case of too slow progress in finding Intersection Point
43 // intermediates Points on the Track must be stored.
44 // Initialise the array of Pointers [max_depth+1] to do this
45
46 G4ThreeVector zeroV(0.0,0.0,0.0);
47 for (G4int idepth=0; idepth<max_depth+1; idepth++ )
48 {
49 ptrInterMedFT[ idepth ] = new G4FieldTrack( zeroV, zeroV, 0., 0., 0., 0.);
50 }
51}
52
53G4MultiLevelLocator::~G4MultiLevelLocator()
54{
55 for ( G4int idepth=0; idepth<max_depth+1; idepth++)
56 {
57 delete ptrInterMedFT[idepth];
58 }
59}
60
61// --------------------------------------------------------------------------
62// G4bool G4PropagatorInField::LocateIntersectionPoint(
63// const G4FieldTrack& CurveStartPointVelocity, // A
64// const G4FieldTrack& CurveEndPointVelocity, // B
65// const G4ThreeVector& TrialPoint, // E
66// G4FieldTrack& IntersectedOrRecalculated // Output
67// G4bool& recalculated ) // Out
68// --------------------------------------------------------------------------
69//
70// Function that returns the intersection of the true path with the surface
71// of the current volume (either the external one or the inner one with one
72// of the daughters:
73//
74// A = Initial point
75// B = another point
76//
77// Both A and B are assumed to be on the true path:
78//
79// E is the first point of intersection of the chord AB with
80// a volume other than A (on the surface of A or of a daughter)
81//
82// Convention of Use :
83// i) If it returns "true", then IntersectionPointVelocity is set
84// to the approximate intersection point.
85// ii) If it returns "false", no intersection was found.
86// The validity of IntersectedOrRecalculated depends on 'recalculated'
87// a) if latter is false, then IntersectedOrRecalculated is invalid.
88// b) if latter is true, then IntersectedOrRecalculated is
89// the new endpoint, due to a re-integration.
90// --------------------------------------------------------------------------
91// NOTE: implementation taken from G4PropagatorInField
92//
93G4bool G4MultiLevelLocator::EstimateIntersectionPoint(
94 const G4FieldTrack& CurveStartPointVelocity, // A
95 const G4FieldTrack& CurveEndPointVelocity, // B
96 const G4ThreeVector& TrialPoint, // E
97 G4FieldTrack& IntersectedOrRecalculatedFT, // Output
98 G4bool& recalculatedEndPoint, // Out
99 G4double &fPreviousSafety, // In/Out
100 G4ThreeVector &fPreviousSftOrigin) // In/Out
101{
102 // Find Intersection Point ( A, B, E ) of true path AB - start at E.
103
104 G4bool found_approximate_intersection = false;
105 G4bool there_is_no_intersection = false;
106
107 G4FieldTrack CurrentA_PointVelocity = CurveStartPointVelocity;
108 G4FieldTrack CurrentB_PointVelocity = CurveEndPointVelocity;
109 G4ThreeVector CurrentE_Point = TrialPoint;
110 G4FieldTrack ApproxIntersecPointV(CurveEndPointVelocity); // FT-Def-Construct
111 G4double NewSafety = 0.0;
112 G4bool last_AF_intersection = false;
113
114 // G4bool final_section= true; // Shows whether current section is last
115 // (i.e. B=full end)
116 G4bool first_section = true;
117 recalculatedEndPoint = false;
118
119 G4bool restoredFullEndpoint = false;
120
121 G4int substep_no = 0;
122
123 // Limits for substep number
124 //
125 const G4int max_substeps= 10000; // Test 120 (old value 100 )
126 const G4int warn_substeps= 1000; // 100
127
128 // Statistics for substeps
129 //
130 static G4int max_no_seen= -1;
131 static G4int trigger_substepno_print= warn_substeps - 20 ;
132
133 //--------------------------------------------------------------------------
134 // Algorithm for the case if progress in founding intersection is too slow.
135 // Process is defined too slow if after N=param_substeps advances on the
136 // path, it will be only 'fraction_done' of the total length.
137 // In this case the remaining length is divided in two half and
138 // the loop is restarted for each half.
139 // If progress is still too slow, the division in two halfs continue
140 // until 'max_depth'.
141 //--------------------------------------------------------------------------
142
143 const G4int param_substeps=10; // Test value for the maximum number
144 // of substeps
145 const G4double fraction_done=0.3;
146
147 G4bool Second_half = false; // First half or second half of divided step
148
149 // We need to know this for the 'final_section':
150 // real 'final_section' or first half 'final_section'
151 // In algorithm it is considered that the 'Second_half' is true
152 // and it becomes false only if we are in the first-half of level
153 // depthness or if we are in the first section
154
155 G4int depth=0; // Depth counts how many subdivisions of initial step made
156
157#ifdef G4DEBUG_FIELD
158 static G4double tolerance= 1.0e-8;
159 G4ThreeVector StartPosition= CurveStartPointVelocity.GetPosition();
160 if( (TrialPoint - StartPosition).mag() < tolerance * mm )
161 {
162 G4cerr << "WARNING - G4MultiLevelLocator::EstimateIntersectionPoint()"
163 << G4endl
164 << " Intermediate F point is on top of starting point A."
165 << G4endl;
166 G4Exception("G4MultiLevelLocator::EstimateIntersectionPoint()",
167 "IntersectionPointIsAtStart", JustWarning,
168 "Intersection point F is exactly at start point A." );
169 }
170#endif
171
172 // Intermediates Points on the Track = Subdivided Points must be stored.
173 // Give the initial values to 'InterMedFt'
174 // Important is 'ptrInterMedFT[0]', it saves the 'EndCurvePoint'
175 //
176 *ptrInterMedFT[0] = CurveEndPointVelocity;
177 for (G4int idepth=1; idepth<max_depth+1; idepth++ )
178 {
179 *ptrInterMedFT[idepth]=CurveStartPointVelocity;
180 }
181
182 // Final_section boolean store
183 //
184 G4bool fin_section_depth[max_depth];
185 for (G4int idepth=0; idepth<max_depth; idepth++ )
186 {
187 fin_section_depth[idepth]=true;
188 }
189 // 'SubStartPoint' is needed to calculate the length of the divided step
190 //
191 G4FieldTrack SubStart_PointVelocity = CurveStartPointVelocity;
192
193 do
194 {
195 G4int substep_no_p = 0;
196 G4bool sub_final_section = false; // the same as final_section,
197 // but for 'sub_section'
198 SubStart_PointVelocity = CurrentA_PointVelocity;
199 do // REPEAT param
200 {
201 G4ThreeVector Point_A = CurrentA_PointVelocity.GetPosition();
202 G4ThreeVector Point_B = CurrentB_PointVelocity.GetPosition();
203
204 // F = a point on true AB path close to point E
205 // (the closest if possible)
206 //
207 ApproxIntersecPointV = GetChordFinderFor()
208 ->ApproxCurvePointV( CurrentA_PointVelocity,
209 CurrentB_PointVelocity,
210 CurrentE_Point,
211 GetEpsilonStepFor());
212 // The above method is the key & most intuitive part ...
213
214#ifdef G4DEBUG_FIELD
215 if( ApproxIntersecPointV.GetCurveLength() >
216 CurrentB_PointVelocity.GetCurveLength() * (1.0 + tolerance) )
217 {
218 G4cerr << "ERROR - G4MultiLevelLocator::EstimateIntersectionPoint()"
219 << G4endl
220 << " Intermediate F point is more advanced than"
221 << " endpoint B." << G4endl;
222 G4Exception("G4multiLevelLocator::EstimateIntersectionPoint()",
223 "IntermediatePointConfusion", FatalException,
224 "Intermediate F point is past end B point" );
225 }
226#endif
227
228 G4ThreeVector CurrentF_Point= ApproxIntersecPointV.GetPosition();
229
230 // First check whether EF is small - then F is a good approx. point
231 // Calculate the length and direction of the chord AF
232 //
233 G4ThreeVector ChordEF_Vector = CurrentF_Point - CurrentE_Point;
234
235 if ( ChordEF_Vector.mag2() <= sqr(GetDeltaIntersectionFor()) )
236 {
237 found_approximate_intersection = true;
238
239 // Create the "point" return value
240 //
241 IntersectedOrRecalculatedFT = ApproxIntersecPointV;
242 IntersectedOrRecalculatedFT.SetPosition( CurrentE_Point );
243
244 if ( GetAdjustementOfFoundIntersection() )
245 {
246 // Try to Get Correction of IntersectionPoint using SurfaceNormal()
247 //
248 G4ThreeVector IP;
249 G4ThreeVector MomentumDir=ApproxIntersecPointV.GetMomentumDirection();
250 G4bool goodCorrection = AdjustmentOfFoundIntersection(Point_A,
251 CurrentE_Point, CurrentF_Point, MomentumDir,
252 last_AF_intersection, IP, NewSafety,
253 fPreviousSafety, fPreviousSftOrigin );
254 if ( goodCorrection )
255 {
256 IntersectedOrRecalculatedFT = ApproxIntersecPointV;
257 IntersectedOrRecalculatedFT.SetPosition(IP);
258 }
259 }
260 // Note: in order to return a point on the boundary,
261 // we must return E. But it is F on the curve.
262 // So we must "cheat": we are using the position at point E
263 // and the velocity at point F !!!
264 //
265 // This must limit the length we can allow for displacement!
266 }
267 else // E is NOT close enough to the curve (ie point F)
268 {
269 // Check whether any volumes are encountered by the chord AF
270 // ---------------------------------------------------------
271 // First relocate to restore any Voxel etc information
272 // in the Navigator before calling ComputeStep()
273 //
274 GetNavigatorFor()->LocateGlobalPointWithinVolume( Point_A );
275
276 G4ThreeVector PointG; // Candidate intersection point
277 G4double stepLengthAF;
278 G4bool Intersects_AF = IntersectChord( Point_A, CurrentF_Point,
279 NewSafety,fPreviousSafety,
280 fPreviousSftOrigin,
281 stepLengthAF,
282 PointG );
283 last_AF_intersection = Intersects_AF;
284 if( Intersects_AF )
285 {
286 // G is our new Candidate for the intersection point.
287 // It replaces "E" and we will repeat the test to see if
288 // it is a good enough approximate point for us.
289 // B <- F
290 // E <- G
291 //
292 CurrentB_PointVelocity = ApproxIntersecPointV;
293 CurrentE_Point = PointG;
294
295 // By moving point B, must take care if current
296 // AF has no intersection to try current FB!!
297 //
298 fin_section_depth[depth]=false;
299
300
301#ifdef G4VERBOSE
302 if( fVerboseLevel > 3 )
303 {
304 G4cout << "G4PiF::LI> Investigating intermediate point"
305 << " at s=" << ApproxIntersecPointV.GetCurveLength()
306 << " on way to full s="
307 << CurveEndPointVelocity.GetCurveLength() << G4endl;
308 }
309#endif
310 }
311 else // not Intersects_AF
312 {
313 // In this case:
314 // There is NO intersection of AF with a volume boundary.
315 // We must continue the search in the segment FB!
316 //
317 GetNavigatorFor()->LocateGlobalPointWithinVolume( CurrentF_Point );
318
319 G4double stepLengthFB;
320 G4ThreeVector PointH;
321
322 // Check whether any volumes are encountered by the chord FB
323 // ---------------------------------------------------------
324
325 G4bool Intersects_FB = IntersectChord( CurrentF_Point, Point_B,
326 NewSafety,fPreviousSafety,
327 fPreviousSftOrigin,
328 stepLengthFB,
329 PointH );
330 if( Intersects_FB )
331 {
332 // There is an intersection of FB with a volume boundary
333 // H <- First Intersection of Chord FB
334
335 // H is our new Candidate for the intersection point.
336 // It replaces "E" and we will repeat the test to see if
337 // it is a good enough approximate point for us.
338
339 // Note that F must be in volume volA (the same as A)
340 // (otherwise AF would meet a volume boundary!)
341 // A <- F
342 // E <- H
343 //
344 CurrentA_PointVelocity = ApproxIntersecPointV;
345 CurrentE_Point = PointH;
346 }
347 else // not Intersects_FB
348 {
349 // There is NO intersection of FB with a volume boundary
350
351 if(fin_section_depth[depth])
352 {
353 // If B is the original endpoint, this means that whatever
354 // volume(s) intersected the original chord, none touch the
355 // smaller chords we have used.
356 // The value of 'IntersectedOrRecalculatedFT' returned is
357 // likely not valid
358
359 // Check on real final_section or SubEndSection
360 //
361 if( ((Second_half)&&(depth==0)) || (first_section) )
362 {
363 there_is_no_intersection = true; // real final_section
364 }
365 else
366 {
367 // end of subsection, not real final section
368 // exit from the and go to the depth-1 level
369
370 substep_no_p = param_substeps+2; // exit from the loop
371
372 // but 'Second_half' is still true because we need to find
373 // the 'CurrentE_point' for the next loop
374 //
375 Second_half = true;
376 sub_final_section = true;
377
378 }
379 }
380 else
381 {
382 if(depth==0)
383 {
384 // We must restore the original endpoint
385 //
386 CurrentA_PointVelocity = CurrentB_PointVelocity; // Got to B
387 CurrentB_PointVelocity = CurveEndPointVelocity;
388 SubStart_PointVelocity = CurrentA_PointVelocity;
389 restoredFullEndpoint = true;
390 }
391 else
392 {
393 // We must restore the depth endpoint
394 //
395 CurrentA_PointVelocity = CurrentB_PointVelocity; // Got to B
396 CurrentB_PointVelocity = *ptrInterMedFT[depth];
397 SubStart_PointVelocity = CurrentA_PointVelocity;
398 restoredFullEndpoint = true;
399 }
400 }
401 } // Endif (Intersects_FB)
402 } // Endif (Intersects_AF)
403
404 // Ensure that the new endpoints are not further apart in space
405 // than on the curve due to different errors in the integration
406 //
407 G4double linDistSq, curveDist;
408 linDistSq = ( CurrentB_PointVelocity.GetPosition()
409 - CurrentA_PointVelocity.GetPosition() ).mag2();
410 curveDist = CurrentB_PointVelocity.GetCurveLength()
411 - CurrentA_PointVelocity.GetCurveLength();
412
413 // Change this condition for very strict parameters of propagation
414 //
415 if( curveDist*curveDist*(1+2* GetEpsilonStepFor()) < linDistSq )
416 {
417 // Re-integrate to obtain a new B
418 //
419 G4FieldTrack newEndPointFT=
420 ReEstimateEndpoint( CurrentA_PointVelocity,
421 CurrentB_PointVelocity,
422 linDistSq, // to avoid recalculation
423 curveDist );
424 G4FieldTrack oldPointVelB = CurrentB_PointVelocity;
425 CurrentB_PointVelocity = newEndPointFT;
426
427 if ( (fin_section_depth[depth]) // real final section
428 &&( first_section || ((Second_half)&&(depth==0)) ) )
429 {
430 recalculatedEndPoint = true;
431 IntersectedOrRecalculatedFT = newEndPointFT;
432 // So that we can return it, if it is the endpoint!
433 }
434 }
435 if( curveDist < 0.0 )
436 {
437 G4cerr << "ERROR - G4MultiLevelLocator::EstimateIntersectionPoint()"
438 << G4endl
439 << " Error in advancing propagation." << G4endl;
440 fVerboseLevel = 5; // Print out a maximum of information
441 printStatus( CurrentA_PointVelocity, CurrentB_PointVelocity,
442 -1.0, NewSafety, substep_no );
443 G4cerr << " Point A (start) is " << CurrentA_PointVelocity
444 << G4endl;
445 G4cerr << " Point B (end) is " << CurrentB_PointVelocity
446 << G4endl;
447 G4cerr << " Curve distance is " << curveDist << G4endl;
448 G4cerr << G4endl
449 << "The final curve point is not further along"
450 << " than the original!" << G4endl;
451
452 if( recalculatedEndPoint )
453 {
454 G4cerr << "Recalculation of EndPoint was called with fEpsStep= "
455 << GetEpsilonStepFor() << G4endl;
456 }
457 G4cerr.precision(20);
458 G4cerr << " Point A (Curve start) is " << CurveStartPointVelocity
459 << G4endl;
460 G4cerr << " Point B (Curve end) is " << CurveEndPointVelocity
461 << G4endl;
462 G4cerr << " Point A (Current start) is " << CurrentA_PointVelocity
463 << G4endl;
464 G4cerr << " Point B (Current end) is " << CurrentB_PointVelocity
465 << G4endl;
466 G4cerr << " Point S (Sub start) is " << SubStart_PointVelocity
467 << G4endl;
468 G4cerr << " Point E (Trial Point) is " << CurrentE_Point
469 << G4endl;
470 G4cerr << " Point F (Intersection) is " << ApproxIntersecPointV
471 << G4endl;
472 G4cerr << " LocateIntersection parameters are : Substep no= "
473 << substep_no << G4endl;
474 G4cerr << " Substep depth no= "<< substep_no_p << " Depth= "
475 << depth << G4endl;
476
477 G4Exception("G4MultiLevelLocator::EstimateIntersectionPoint()",
478 "FatalError", FatalException,
479 "Error in advancing propagation.");
480 }
481 if(restoredFullEndpoint)
482 {
483 fin_section_depth[depth] = restoredFullEndpoint;
484 restoredFullEndpoint = false;
485 }
486 } // EndIf ( E is close enough to the curve, ie point F. )
487 // tests ChordAF_Vector.mag() <= maximum_lateral_displacement
488
489#ifdef G4DEBUG_LOCATE_INTERSECTION
490 if( substep_no >= trigger_substepno_print )
491 {
492 G4cout << "Difficulty in converging in "
493 << "G4MultiLevelLocator::EstimateIntersectionPoint():"
494 << G4endl
495 << " Substep no = " << substep_no << G4endl;
496 if( substep_no == trigger_substepno_print )
497 {
498 printStatus( CurveStartPointVelocity, CurveEndPointVelocity,
499 -1.0, NewSafety, 0);
500 }
501 G4cout << " State of point A: ";
502 printStatus( CurrentA_PointVelocity, CurrentA_PointVelocity,
503 -1.0, NewSafety, substep_no-1, 0);
504 G4cout << " State of point B: ";
505 printStatus( CurrentA_PointVelocity, CurrentB_PointVelocity,
506 -1.0, NewSafety, substep_no);
507 }
508#endif
509 substep_no++;
510 substep_no_p++;
511
512 } while ( ( ! found_approximate_intersection )
513 && ( ! there_is_no_intersection )
514 && ( substep_no_p <= param_substeps) ); // UNTIL found or
515 // failed param substep
516 first_section = false;
517
518 if( (!found_approximate_intersection) && (!there_is_no_intersection) )
519 {
520 G4double did_len = std::abs( CurrentA_PointVelocity.GetCurveLength()
521 - SubStart_PointVelocity.GetCurveLength());
522 G4double all_len = std::abs( CurrentB_PointVelocity.GetCurveLength()
523 - SubStart_PointVelocity.GetCurveLength());
524
525 G4double stepLengthAB;
526 G4ThreeVector PointGe;
527 // Check if progress is too slow and if it possible to go deeper,
528 // then halve the step if so
529 //
530 if( ( ( did_len )<fraction_done*all_len)
531 && (depth<max_depth) && (!sub_final_section) )
532 {
533 Second_half=false;
534 depth++;
535
536 G4double Sub_len = (all_len-did_len)/(2.);
537 G4FieldTrack start = CurrentA_PointVelocity;
538 G4MagInt_Driver* integrDriver
539 = GetChordFinderFor()->GetIntegrationDriver();
540 integrDriver->AccurateAdvance(start, Sub_len, GetEpsilonStepFor());
541 *ptrInterMedFT[depth] = start;
542 CurrentB_PointVelocity = *ptrInterMedFT[depth];
543
544 // Adjust 'SubStartPoint' to calculate the 'did_length' in next loop
545 //
546 SubStart_PointVelocity = CurrentA_PointVelocity;
547
548 // Find new trial intersection point needed at start of the loop
549 //
550 G4ThreeVector Point_A = CurrentA_PointVelocity.GetPosition();
551 G4ThreeVector SubE_point = CurrentB_PointVelocity.GetPosition();
552
553 GetNavigatorFor()->LocateGlobalPointWithinVolume(Point_A);
554 G4bool Intersects_AB = IntersectChord(Point_A, SubE_point,
555 NewSafety, fPreviousSafety,
556 fPreviousSftOrigin,stepLengthAB,
557 PointGe);
558 if( Intersects_AB )
559 {
560 last_AF_intersection = Intersects_AB;
561 CurrentE_Point = PointGe;
562 fin_section_depth[depth]=true;
563 }
564 else
565 {
566 // No intersection found for first part of curve
567 // (CurrentA,InterMedPoint[depth]). Go to the second part
568 //
569 Second_half = true;
570 }
571 } // if did_len
572
573 if( (Second_half)&&(depth!=0) )
574 {
575 // Second part of curve (InterMed[depth],Intermed[depth-1]) )
576 // On the depth-1 level normally we are on the 'second_half'
577
578 Second_half = true;
579 // Find new trial intersection point needed at start of the loop
580 //
581 SubStart_PointVelocity = *ptrInterMedFT[depth];
582 CurrentA_PointVelocity = *ptrInterMedFT[depth];
583 CurrentB_PointVelocity = *ptrInterMedFT[depth-1];
584 // Ensure that the new endpoints are not further apart in space
585 // than on the curve due to different errors in the integration
586 //
587 G4double linDistSq, curveDist;
588 linDistSq = ( CurrentB_PointVelocity.GetPosition()
589 - CurrentA_PointVelocity.GetPosition() ).mag2();
590 curveDist = CurrentB_PointVelocity.GetCurveLength()
591 - CurrentA_PointVelocity.GetCurveLength();
592 if( curveDist*curveDist*(1+2*GetEpsilonStepFor() ) < linDistSq )
593 {
594 // Re-integrate to obtain a new B
595 //
596 G4FieldTrack newEndPointFT=
597 ReEstimateEndpoint( CurrentA_PointVelocity,
598 CurrentB_PointVelocity,
599 linDistSq, // to avoid recalculation
600 curveDist );
601 G4FieldTrack oldPointVelB = CurrentB_PointVelocity;
602 CurrentB_PointVelocity = newEndPointFT;
603 if (depth==1)
604 {
605 recalculatedEndPoint = true;
606 IntersectedOrRecalculatedFT = newEndPointFT;
607 // So that we can return it, if it is the endpoint!
608 }
609 }
610
611 G4ThreeVector Point_A = CurrentA_PointVelocity.GetPosition();
612 G4ThreeVector SubE_point = CurrentB_PointVelocity.GetPosition();
613 GetNavigatorFor()->LocateGlobalPointWithinVolume(Point_A);
614 G4bool Intersects_AB = IntersectChord(Point_A, SubE_point, NewSafety,
615 fPreviousSafety,
616 fPreviousSftOrigin,stepLengthAB,
617 PointGe);
618 if( Intersects_AB )
619 {
620 last_AF_intersection = Intersects_AB;
621 CurrentE_Point = PointGe;
622 }
623 depth--;
624 fin_section_depth[depth]=true;
625 }
626 } // if(!found_aproximate_intersection)
627
628 } while ( ( ! found_approximate_intersection )
629 && ( ! there_is_no_intersection )
630 && ( substep_no <= max_substeps) ); // UNTIL found or failed
631
632 if( substep_no > max_no_seen )
633 {
634 max_no_seen = substep_no;
635 if( max_no_seen > warn_substeps )
636 {
637 trigger_substepno_print = max_no_seen-20; // Want to see last 20 steps
638 }
639 }
640
641 if( ( substep_no >= max_substeps)
642 && !there_is_no_intersection
643 && !found_approximate_intersection )
644 {
645 G4cerr << "WARNING - G4MultiLevelLocator::EstimateIntersectionPoint()"
646 << G4endl
647 << " Convergence is requiring too many substeps: "
648 << substep_no << G4endl;
649 G4cerr << " Abandoning effort to intersect. " << G4endl;
650 G4cerr << " Information on start & current step follows in cout."
651 << G4endl;
652 G4cout << "WARNING - G4MultiLevelLocator::EstimateIntersectionPoint()"
653 << G4endl
654 << " Convergence is requiring too many substeps: "
655 << substep_no << G4endl;
656 G4cout << " Found intersection = "
657 << found_approximate_intersection << G4endl
658 << " Intersection exists = "
659 << !there_is_no_intersection << G4endl;
660 G4cout << " Start and Endpoint of Requested Step:" << G4endl;
661 printStatus( CurveStartPointVelocity, CurveEndPointVelocity,
662 -1.0, NewSafety, 0);
663 G4cout << G4endl;
664 G4cout << " 'Bracketing' starting and endpoint of current Sub-Step"
665 << G4endl;
666 printStatus( CurrentA_PointVelocity, CurrentA_PointVelocity,
667 -1.0, NewSafety, substep_no-1);
668 printStatus( CurrentA_PointVelocity, CurrentB_PointVelocity,
669 -1.0, NewSafety, substep_no);
670 G4cout << G4endl;
671
672#ifdef FUTURE_CORRECTION
673 // Attempt to correct the results of the method // FIX - TODO
674
675 if ( ! found_approximate_intersection )
676 {
677 recalculatedEndPoint = true;
678 // Return the further valid intersection point -- potentially A ??
679 // JA/19 Jan 2006
680 IntersectedOrRecalculatedFT = CurrentA_PointVelocity;
681
682 G4cout << "WARNING - G4MultiLevelLocator::EstimateIntersectionPoint()"
683 << G4endl
684 << " Did not convergence after " << substep_no
685 << " substeps." << G4endl;
686 G4cout << " The endpoint was adjused to pointA resulting"
687 << G4endl
688 << " from the last substep: " << CurrentA_PointVelocity
689 << G4endl;
690 }
691#endif
692
693 G4cout.precision( 10 );
694 G4double done_len = CurrentA_PointVelocity.GetCurveLength();
695 G4double full_len = CurveEndPointVelocity.GetCurveLength();
696 G4cout << "ERROR - G4MultiLevelLocator::EstimateIntersectionPoint()"
697 << G4endl
698 << " Undertaken only length: " << done_len
699 << " out of " << full_len << " required." << G4endl;
700 G4cout << " Remaining length = " << full_len - done_len << G4endl;
701
702 G4Exception("G4MultiLevelLocator::EstimateIntersectionPoint()",
703 "UnableToLocateIntersection", FatalException,
704 "Too many substeps while trying to locate intersection.");
705 }
706 else if( substep_no >= warn_substeps )
707 {
708 G4int oldprc= G4cout.precision( 10 );
709 G4cout << "WARNING - G4MultiLevelLocator::EstimateIntersectionPoint()"
710 << G4endl
711 << " Undertaken length: "
712 << CurrentB_PointVelocity.GetCurveLength();
713 G4cout << " - Needed: " << substep_no << " substeps." << G4endl
714 << " Warning level = " << warn_substeps
715 << " and maximum substeps = " << max_substeps << G4endl;
716 G4Exception("G4MultiLevelLocator::EstimateIntersectionPoint()",
717 "DifficultyToLocateIntersection", JustWarning,
718 "Many substeps while trying to locate intersection.");
719 G4cout.precision( oldprc );
720 }
721 return !there_is_no_intersection; // Success or failure
722}
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