source: trunk/source/geometry/navigation/src/G4VIntersectionLocator.cc @ 1347

Last change on this file since 1347 was 1347, checked in by garnier, 13 years ago

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26// $Id: G4VIntersectionLocator.cc,v 1.8 2010/07/13 15:59:42 gcosmo Exp $
27// GEANT4 tag $Name: geant4-09-04-ref-00 $
28//
29// Class G4VIntersectionLocator implementation
30//
31// 27.10.08 - John Apostolakis, Tatiana Nikitina.
32// ---------------------------------------------------------------------------
33 
34#include <iomanip>
35
36#include "globals.hh"
37#include "G4ios.hh"
38#include "G4VIntersectionLocator.hh"
39#include "G4GeometryTolerance.hh"
40
41///////////////////////////////////////////////////////////////////////////
42//
43// Constructor
44//
45G4VIntersectionLocator:: G4VIntersectionLocator(G4Navigator *theNavigator): 
46  fUseNormalCorrection(false), 
47  fiNavigator( theNavigator ),
48  fiChordFinder( 0 ),            // Not set - overridden at each step
49  fiEpsilonStep( -1.0 ),         // Out of range - overridden at each step
50  fiDeltaIntersection( -1.0 ),   // Out of range - overridden at each step
51  fiUseSafety(false)             // Default - overridden at each step
52{
53  kCarTolerance = G4GeometryTolerance::GetInstance()->GetSurfaceTolerance();
54  fVerboseLevel = 0;
55  fHelpingNavigator = new G4Navigator();
56}     
57
58///////////////////////////////////////////////////////////////////////////
59//
60// Destructor.
61//
62G4VIntersectionLocator::~G4VIntersectionLocator()
63{
64  delete fHelpingNavigator;
65}
66
67///////////////////////////////////////////////////////////////////////////
68//
69// Dumps status of propagator.
70//
71void
72G4VIntersectionLocator::printStatus( const G4FieldTrack&        StartFT,
73                                     const G4FieldTrack&        CurrentFT, 
74                                           G4double             requestStep, 
75                                           G4double             safety,
76                                           G4int                stepNo)
77{
78  const G4int verboseLevel= fVerboseLevel;
79  const G4ThreeVector StartPosition       = StartFT.GetPosition();
80  const G4ThreeVector StartUnitVelocity   = StartFT.GetMomentumDir();
81  const G4ThreeVector CurrentPosition     = CurrentFT.GetPosition();
82  const G4ThreeVector CurrentUnitVelocity = CurrentFT.GetMomentumDir();
83
84  G4double step_len = CurrentFT.GetCurveLength() - StartFT.GetCurveLength();
85  G4int oldprc;  // cout/cerr precision settings
86
87  if( ((stepNo == 0) && (verboseLevel <3)) || (verboseLevel >= 3) )
88  {
89    oldprc = G4cout.precision(4);
90    G4cout << std::setw( 6)  << " " 
91           << std::setw( 25) << " Current Position  and  Direction" << " "
92           << G4endl; 
93    G4cout << std::setw( 5) << "Step#" 
94           << std::setw(10) << "  s  " << " "
95           << std::setw(10) << "X(mm)" << " "
96           << std::setw(10) << "Y(mm)" << " " 
97           << std::setw(10) << "Z(mm)" << " "
98           << std::setw( 7) << " N_x " << " "
99           << std::setw( 7) << " N_y " << " "
100           << std::setw( 7) << " N_z " << " " ;
101    G4cout << std::setw( 7) << " Delta|N|" << " "
102           << std::setw( 9) << "StepLen" << " " 
103           << std::setw(12) << "StartSafety" << " " 
104           << std::setw( 9) << "PhsStep" << " "; 
105    G4cout << G4endl;
106    G4cout.precision(oldprc);
107  }
108  if((stepNo == 0) && (verboseLevel <=3))
109  {
110    // Recurse to print the start values
111    //
112    printStatus( StartFT, StartFT, -1.0, safety, -1);
113  }
114  if( verboseLevel <= 3 )
115  {
116    if( stepNo >= 0)
117    {
118       G4cout << std::setw( 4) << stepNo << " ";
119    }
120    else
121    {
122       G4cout << std::setw( 5) << "Start" ;
123    }
124    oldprc = G4cout.precision(8);
125    G4cout << std::setw(10) << CurrentFT.GetCurveLength() << " "; 
126    G4cout << std::setw(10) << CurrentPosition.x() << " "
127           << std::setw(10) << CurrentPosition.y() << " "
128           << std::setw(10) << CurrentPosition.z() << " ";
129    G4cout.precision(4);
130    G4cout << std::setw( 7) << CurrentUnitVelocity.x() << " "
131           << std::setw( 7) << CurrentUnitVelocity.y() << " "
132           << std::setw( 7) << CurrentUnitVelocity.z() << " ";
133    G4cout.precision(3); 
134    G4cout << std::setw( 7)
135           << CurrentFT.GetMomentum().mag()- StartFT.GetMomentum().mag()
136           << " "; 
137    G4cout << std::setw( 9) << step_len << " "; 
138    G4cout << std::setw(12) << safety << " ";
139    if( requestStep != -1.0 )
140    {
141      G4cout << std::setw( 9) << requestStep << " ";
142    }
143    else
144    {
145      G4cout << std::setw( 9) << "Init/NotKnown" << " "; 
146    }
147    G4cout << G4endl;
148    G4cout.precision(oldprc);
149  }
150  else // if( verboseLevel > 3 )
151  {
152    //  Multi-line output
153       
154    G4cout << "Step taken was " << step_len 
155           << " out of PhysicalStep= " <<  requestStep << G4endl;
156    G4cout << "Final safety is: " << safety << G4endl;
157    G4cout << "Chord length = " << (CurrentPosition-StartPosition).mag()
158           << G4endl;
159    G4cout << G4endl; 
160  }
161}
162
163///////////////////////////////////////////////////////////////////////////
164//
165// ReEstimateEndPoint.
166//
167G4FieldTrack G4VIntersectionLocator::
168ReEstimateEndpoint( const G4FieldTrack &CurrentStateA, 
169                    const G4FieldTrack &EstimatedEndStateB,
170                          G4double      linearDistSq,
171                          G4double      curveDist )
172{ 
173  G4FieldTrack newEndPoint( CurrentStateA );
174  G4MagInt_Driver* integrDriver= GetChordFinderFor()->GetIntegrationDriver(); 
175
176  G4FieldTrack retEndPoint( CurrentStateA );
177  G4bool goodAdvance;
178  G4int  itrial=0;
179  const G4int no_trials= 20;
180
181  G4double endCurveLen= EstimatedEndStateB.GetCurveLength();
182  do
183  {
184     G4double currentCurveLen= newEndPoint.GetCurveLength();
185     G4double advanceLength= endCurveLen - currentCurveLen ; 
186     if (std::abs(advanceLength)<kCarTolerance)
187     {
188       goodAdvance=true;
189     }
190     else{
191     goodAdvance= 
192       integrDriver->AccurateAdvance(newEndPoint, advanceLength,
193                                     GetEpsilonStepFor());
194     }
195  }
196  while( !goodAdvance && (++itrial < no_trials) );
197
198  if( goodAdvance )
199  {
200    retEndPoint= newEndPoint; 
201  }
202  else
203  {
204    retEndPoint= EstimatedEndStateB; // Could not improve without major work !!
205  }
206
207  //  All the work is done
208  //  below are some diagnostics only -- before the return!
209  //
210  static const G4String MethodName("G4VIntersectionLocator::ReEstimateEndpoint");
211
212#ifdef G4VERBOSE
213  G4int  latest_good_trials=0;
214  if( itrial > 1)
215  {
216    if( fVerboseLevel > 0 )
217    {
218      G4cout << MethodName << " called - goodAdv= " << goodAdvance
219             << " trials = " << itrial
220             << " previous good= " << latest_good_trials
221             << G4endl;
222    }
223    latest_good_trials=0; 
224  }
225  else
226  {   
227    latest_good_trials++; 
228  }
229#endif
230
231#ifdef G4DEBUG_FIELD
232  G4double lengthDone = newEndPoint.GetCurveLength() 
233                      - CurrentStateA.GetCurveLength(); 
234  if( !goodAdvance )
235  {
236    if( fVerboseLevel >= 3 )
237    {
238      G4cout << MethodName << "> AccurateAdvance failed " ;
239      G4cout << " in " << itrial << " integration trials/steps. " << G4endl;
240      G4cout << " It went only " << lengthDone << " instead of " << curveDist
241             << " -- a difference of " << curveDist - lengthDone  << G4endl;
242      G4cout << " ReEstimateEndpoint> Reset endPoint to original value!"
243             << G4endl;
244    }
245  }
246
247  static G4int noInaccuracyWarnings = 0; 
248  G4int maxNoWarnings = 10;
249  if (  (noInaccuracyWarnings < maxNoWarnings ) 
250       || (fVerboseLevel > 1) )
251    {
252      G4cerr << "G4PropagatorInField::LocateIntersectionPoint():"
253             << G4endl
254             << " Warning: Integration inaccuracy requires" 
255             <<   " an adjustment in the step's endpoint."  << G4endl
256             << "   Two mid-points are further apart than their"
257             <<   " curve length difference"                << G4endl
258             << "   Dist = "       << std::sqrt(linearDistSq)
259             << " curve length = " << curveDist             << G4endl; 
260      G4cerr << " Correction applied is " 
261             << (newEndPoint.GetPosition()-EstimatedEndStateB.GetPosition()).mag()
262             << G4endl;
263    }
264#else
265  // Statistics on the RMS value of the corrections
266
267  static G4int    noCorrections=0;
268  static G4double sumCorrectionsSq = 0;
269  noCorrections++; 
270  if( goodAdvance )
271  {
272    sumCorrectionsSq += (EstimatedEndStateB.GetPosition() - 
273                         newEndPoint.GetPosition()).mag2();
274  }
275  linearDistSq -= curveDist; // To use linearDistSq ... !
276#endif
277
278  return retEndPoint;
279}
280
281///////////////////////////////////////////////////////////////////////////
282//
283// Method for finding SurfaceNormal of Intersecting Solid
284//
285G4ThreeVector G4VIntersectionLocator::
286GetLocalSurfaceNormal(const G4ThreeVector &CurrentE_Point, G4bool &validNormal)
287{
288  G4ThreeVector Normal(G4ThreeVector(0,0,0));
289  G4VPhysicalVolume* located;
290
291  validNormal = false;
292  fHelpingNavigator->SetWorldVolume(GetNavigatorFor()->GetWorldVolume());
293  located = fHelpingNavigator->LocateGlobalPointAndSetup( CurrentE_Point );
294  G4TouchableHistoryHandle aTouchable = fHelpingNavigator
295                                      ->CreateTouchableHistoryHandle();
296  G4ThreeVector localPosition = aTouchable->GetHistory()
297                ->GetTopTransform().TransformPoint(CurrentE_Point);
298
299  if( located != 0)
300  { 
301    if (located->GetLogicalVolume()
302        ->GetSolid()->Inside(localPosition)==kSurface)
303    {
304      Normal = located->GetLogicalVolume()
305                      ->GetSolid()->SurfaceNormal(localPosition);
306      validNormal = true;
307    }
308  }
309
310  return Normal;
311}
312
313///////////////////////////////////////////////////////////////////////////
314//
315// Adjustment of Found Intersection
316//
317G4bool G4VIntersectionLocator::
318AdjustmentOfFoundIntersection( const G4ThreeVector &CurrentA_Point,
319                               const G4ThreeVector &CurrentE_Point, 
320                               const G4ThreeVector &CurrentF_Point,
321                               const G4ThreeVector &MomentumDir,
322                               const G4bool         IntersectAF,
323                                     G4ThreeVector &IntersectionPoint,  // I/O
324                                     G4double      &NewSafety,          // I/O
325                                     G4double      &fPreviousSafety,    // I/O
326                                     G4ThreeVector &fPreviousSftOrigin )// I/O
327{     
328  G4double dist,lambda;
329  G4ThreeVector Normal, NewPoint, Point_G;
330  G4bool goodAdjust=false, Intersects_FP=false, validNormal=false;
331
332  // Get SurfaceNormal of Intersecting Solid
333  //
334  Normal=GetLocalSurfaceNormal(CurrentE_Point,validNormal);
335  if(!validNormal) { return false; }
336
337  // Intersection between Line and Plane
338  //
339  G4double n_d_m = Normal.dot(MomentumDir);
340  if ( std::abs(n_d_m)>kCarTolerance )
341  {
342    if ( fVerboseLevel>1 )
343    {
344      G4cerr << "WARNING - "
345             << "G4VIntersectionLocator::AdjustementOfFoundIntersection()"
346             << G4endl
347             << "        No intersection. Parallels lines!" << G4endl;
348        return false;
349    }
350    lambda =- Normal.dot(CurrentF_Point-CurrentE_Point)/n_d_m;
351
352    // New candidate for Intersection
353    //
354    NewPoint = CurrentF_Point+lambda*MomentumDir;
355
356    // Distance from CurrentF to Calculated Intersection
357    //
358    dist = std::abs(lambda);
359
360    if ( dist<kCarTolerance*0.001 )  { return false; }
361
362    // Calculation of new intersection point on the path.
363    //
364    if ( IntersectAF )  //  First part intersects
365    {
366      G4double stepLengthFP; 
367      G4ThreeVector Point_P = CurrentA_Point;
368      GetNavigatorFor()->LocateGlobalPointWithinVolume(Point_P);
369      Intersects_FP = IntersectChord( Point_P, NewPoint, NewSafety,
370                                      fPreviousSafety, fPreviousSftOrigin,
371                                      stepLengthFP, Point_G );
372
373    }
374    else   // Second part intersects
375    {     
376      G4double stepLengthFP; 
377      GetNavigatorFor()->LocateGlobalPointWithinVolume(CurrentF_Point );
378      Intersects_FP = IntersectChord( CurrentF_Point, NewPoint, NewSafety,
379                                      fPreviousSafety, fPreviousSftOrigin,
380                                      stepLengthFP, Point_G );
381    }
382    if ( Intersects_FP )
383    {
384      goodAdjust = true;
385      IntersectionPoint = Point_G;             
386    }
387  }
388
389  return goodAdjust;
390}
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