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History @ 1228

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1	$Id: History,v 1.138 2009/12/11 05:48:53 japost Exp $
2	-------------------------------------------------------------------
3
4	=========================================================
5	Geant4 - an Object-Oriented Toolkit for Simulation in HEP
6	=========================================================
7
8	Category History file
9	---------------------
10	This file should be used by G4 developers and category coordinators
11	to briefly summarize all major modifications introduced in the code
12	and keep track of all category-tags.
13	It DOES NOT substitute the CVS log-message one should put at every
14	committal in the CVS repository !
15
16	----------------------------------------------------------
17	* Reverse chronological order (last date on top), please *
18	----------------------------------------------------------
19	Dec 11th, 2009 - J.Apostolakis (geomnav-V09-02-11)
20	------------------------------
21	- G4PropagatorInField
22	* Implementation field by Region
23	- with extra checking of logical volume
24
25	Nov 30th, 2009 - J.Apostolakis (geomnav-V09-02-10)
26	------------------------------
27	- G4VIntersectionLocator
28	* Fix problem in ReEstimateEndPoint() behaviour for very small steps.
29
30	* Corrected constructor to ensure that it initialises all data members.
31	* Labelled the methods (in header) to make noticable those that
32	must changed at every step.
33	( attributes: ChordFinder, EpsilonStep, Navigator )
34
35	Nov 23rd, 2009 - J.Apostolakis
36	------------------------------
37	- Fixed G4PropagatorInField.cc:
38	* Revise condition for flagging ZeroStep to avoid fake triggering.
39	Small proposed steps (from Physics) could trigger the previous
40	simple condition for Tiny/Zero Problem steps.
41	[ This was first commited on branch geomnav-V09-02-08_branch
42	and tagged geomnav-V09-02-80 ]
43
44	Nov 12th, 2009 - J.Apostolakis (geomnav-V09-02-09)
45	------------------------------
46	- G4PropagatorInField: cleanup of minor methods:
47	Added new method RefreshIntersectionLocator to update the state of
48	Use this method to synchronise with IntersectionLocator.
49	Deleted long obsolete methods: SetAccuraciesWithDeltaOneStep
50	SetDeltaIntersection, SetDeltaOneStep
51	Revised implementation to avoid using the older methods
52	GetDeltaIntersection GetDeltaOneStep
53
54	Nov 12th, 2009 - J.Apostolakis (geomnav-V09-02-08)
55	------------------------------
56	- Refined G4PropagatorInField.cc:
57	* Changed parameters for treating consecutive tiny/zero steps:
58	- the value of default decrease factor to 0.25 (from 0.1),
59	- the value is not used when the step size falls below a certain threshold.s
60	This threshold is changed. It is expressed as a multiple of fZeroStepThreshold
61	instead of kCarTolerance. The reasons are:
62	* the threshold were meant to refer to the ZeroStepThreshold (it was kCarTolerance)
63	* the values were now much larger than this ZeroStepThreshold.
64	- The value given to the decrease factor after the first such thresholds is changed to 0.35
65	instead of 0.25, 0.5.
66	* Improved printing of Diagnostic message.
67
68	Nov 3rd, 2009 - J.Apostolakis (geomnav-V09-02-07)
69	------------------------------
70	- Refined G4PropagatorInField.cc:
71	* Added new member fZeroStepThreshold, to enable tuning of threshold for Tiny/Zero steps.
72	* Changed default value from 0.5 * kCarTolerance
73	to max (100,000 * kCarTolerance, 0.1 * micron )
74	* This is first revision to address problem seen at boundary of volumes (Reports of Atlas) .
75
76	June 2nd, 2009 - J.Apostolakis (geomnav-V09-02-06)
77	------------------------------
78	- Fix in G4PropagatorInField::SetNavigator
79	* Forward new Navigator to IntersectionLocator.
80
81	May 20th, 2009 - P.Arce (geomnav-V09-02-05)
82	-----------------------
83	- Added method BuildContainerSolid() taking a solid as argument to
84	G4PhantomParameterisation. Added protection to GetMaterialIndex()
85	for zero index.
86
87	May 18th, 2009 - T.Nikitina (geomnav-V09-02-04)
88	---------------------------
89	- Enhanced algorithm for 'FB_intersects' in order to speedup BrentLocator.
90	- Fix in the usage of the geometrical tolerance in G4VIntersectionLocator
91	in method AdjustementOfFoundIntersection().
92
93	May 13th, 2009 - J.Apostolakis (geomnav-V09-02-03)
94	------------------------------
95	- Fix in G4PathFinder: A geometry is at a boundary if its step is within
96	tolerance of the minimum step for any geometry.
97
98	May 5th, 2009 - T.Nikitina (geomnav-V09-02-02)
99	--------------------------
100	- Fix in G4Navigator::ComputeStep() for the computation of rotation of the
101	'LocalExitNormal' in cases when DistanceToOut() returns non-valid normal
102	for optical photons in rotated solids. Addresses problem report #1059.
103
104	February 26th, 2009 - T.Nikitina (geomnav-V09-02-01)
105	--------------------------------
106	- Fixed problem in G4BrentLocator::EstimateIntersectionPoint() responsible
107	for rare cases of negative steps.
108
109	January 27th, 2009 - G.Cosmo (geomnav-V09-02-00)
110	----------------------------
111	- Added G4RegularNavigationHelper class, used by G4RegularNavigation for
112	counting the number of step lengths in each voxel of the regular structure
113	(by P.Arce).
114	- Some code cleanup...
115
116	December 11th, 2008 - T.Nikitina (geomnav-V09-01-10)
117	--------------------------------
118	- Reinstated G4MultiLevelLocator as the default locator to allow for proper
119	tuning of parameters in propagation in field and avoid CPU penalty currently
120	induced by default parameters.
121	- Corrected text in exceptions in locators classes.
122
123	November 14th, 2008 - T.Nikitina, J.Apostolakis (geomnav-V09-01-09)
124	-----------------------------------------------
125	- Introduced first implementation of new optional method in locator classes
126	AdjustementOfFoundIntersection() using surface-normal of the intersecting
127	solid to boost accuracy. Added the optional call to the new method in each
128	concrete locator.
129	- Removed unnecessary accessors for Brent locator in G4PropagatorInField.
130	- G4VoxelNavigation: implemented additional check when running in "check"
131	mode; if it is on the surface, ensure that it can move on next step;
132	either DistanceToIn(p,v) or DistanceToOut(p,v) should return a finite
133	value greater than the tolerance.
134
135	November 10th, 2008 - G.Cosmo (geomnav-V09-01-08)
136	-----------------------------
137	- G4PathFinder: cleared unecessary calls to ComputeSafety() in ReLocate().
138
139	October 28th, 2008 - T.Nikitina (geomnav-V09-01-07)
140	-------------------------------
141	- Moved method LocateIntersectionPoint() in G4PropagatorInField to a separate
142	class G4VIntersectionLocator, now allowing to use different location
143	algorithms: Brent, MultiLevel, Simple.
144	- New classes: G4VIntersectionLocator, G4SimpleLocator, G4BrentLocator and
145	G4MultiLevelLocator.
146	- Coworks with tag "field-V09-01-03".
147
148	October 10th, 2008 - G.Cosmo (geomnav-V09-01-06)
149	----------------------------
150	- Introduced optional Boolean argument in G4Navigator::ComputeSafety() to
151	allow for computation of safety without modifying the state restoring of
152	the navigator.
153	- Modified accordingly the following classes, for calls to ComputeSafety():
154	G4SafetyHelper, G4PathFinder (now calling ComputeSafety() with TRUE
155	argument to preserve navigator's state), G4MultiNavigator and
156	G4ErrorPropagationNavigator.
157
158	May 5th, 2008 - T.Nikitina (geomnav-V09-01-05)
159	--------------------------
160	- Added Brent method for LocateIntersectionPoint() in G4PropagatorInField.
161	The Brent method is now used as default and can be switched off through
162	call to the proper accessor function SetBrentMethod().
163	- Requires related update to G4ChordFinder in geometry/magneticfield module
164	included in tag "field-V09-01-02".
165
166	April 29th, 2008 - M.Asai (geomnav-V09-01-04)
167	-------------------------
168	- G4PathFinder: commented out warning and exception in ComputeStep()
169	for step smaller than minimum threshold.
170
171	April 28th, 2008 - G.Cosmo (geomnav-V09-01-03)
172	--------------------------
173	- Corrected condition for wrong evaluation order introduced in the
174	previous tag.
175
176	March 13th, 2008 - G.Cosmo (geomnav-V09-01-02)
177	--------------------------
178	- Cleared compilation warnings in G4ReplicaNavigation on gcc-4.3.0 for
179	ambiguous use of parentheses in condition statements.
180
181	January 24th, 2008 - T.Nikitina (geomnav-V09-01-01)
182	-------------------------------
183	- G4PropagatorInField: changed condition for 'ReEstimationEndPoint'
184	in order to better handle very strict parameters of propagation.
185	Also added more verbosity in case of error for negative step.
186	Fixes rare problem observed in production by ATLAS.
187
188	January 22nd, 2008 - P.Arce (geomnav-V09-01-00)
189	---------------------------
190	- G4PhantomParameterisation:
191	o Bug fix in GetReplicaNo() to catch overflows in X and Y.
192	(on suggestion by S.Stute)
193	o Made CheckVoxelsFillContainer() visible in public interface.
194
195	November 16th, 2007 - G.Cosmo (geomnav-V09-00-12)
196	-----------------------------
197	- Cleared compilation warnings for shadowing of variables in classes
198	within the module.
199
200	November 14th, 2007 - G.Cosmo (geomnav-V09-00-11)
201	-----------------------------
202	- Reintroduced artificial push in G4ReplicaNavigation::ComputeStep().
203	Further investigation and eventually reimplementation of LevelLocate()
204	required to take into account point and direction ...
205
206	November 14th, 2007 - G.Cosmo (geomnav-V09-00-10)
207	-----------------------------
208	- Trial to remove artificial push in G4ReplicaNavigation::ComputeStep().
209	- Some minor cleanup.
210
211	November 9th, 2007 - J.Apostolakis (geomnav-V09-00-09)
212	----------------------------------
213	- G4SafetyHelper: Improved ComputeSafety() not to call G4Navigator
214	if exactly on safety 'center'.
215	- G4PathFinder: correction to debug code under #ifdef G4DEBUG_NAVIGATION.
216
217	November 9th, 2007 - G.Cosmo (geomnav-V09-00-08)
218	----------------------------
219	- Fix in G4ReplicaNavigation::DistanceToOut() for exact classification of
220	the linear step for Cartesian case.
221	- Made IdentifyAndPlaceSolid() method inlined in G4ParameterisedNavigation.
222	- Minor cosmetics and cleanup.
223
224	November 6th, 2007 - P.Arce (geomnav-V09-00-07)
225	---------------------------
226	- Optimisation in G4RegularNavigation: use voxelBox->DistanceToOut() instead
227	of ComputeStep() in ComputeStepSkippingEqualMaterials().
228	- Some cleanup and proper formatting of error/warning messages.
229
230	November 2nd, 2007 - J.Apostolakis (geomnav-V09-00-06)
231	----------------------------------
232	- Merging fixes in "geomnav-V09-00-03b" and "geomnav-V09-00-03c" on top
233	of tag "geomnav-V09-00-05".
234
235	November 2nd, 2007 - J.Apostolakis (geomnav-V09-00-03c)
236	----------------------------------
237	- G4PathFinder:
238	o Added setting of 'fNoGeometriesLimiting' in DoNextCurvedStep().
239	o Check to verify that 'fNoGeometriesLimiting' is set by DoNext*Step methods.
240	o Revised data type of 'fNoGeometriesLimiting' to be a int, so that < 0
241	shows 'unset'.
242	- G4PropagatorInField:
243	o Fixes for compilation of code under G4DEBUG_FIELD (problem report #982).
244	o Added extra check of method LocateIntersectionPoint() arguments.
245	- Tag based on "geomnav-V09-00-03b".
246
247	October 29th, 2007 - J.Apostolakis (geomnav-V09-00-03b)
248	----------------------------------
249	- G4PathFinder: first fix for problem of another process shortening steps
250	(between calls to ComputeStep by different processes in same step.)
251	I.e. First call to ComputeStep (geom 1) has proposed Step = 3.0 cm
252	Next call to ComputeStep (geom 2) has proposed Step = 1.0 cm
253	(e.g. Multiple Scattering)
254	- Tag based on "geomnav-V09-00-03a".
255
256	October 24th, 2007 - J.Apostolakis (geomnav-V09-00-05)
257	----------------------------------
258	- Merging fixes introduced in "geomnav-V09-00-03a" on top of
259	"geomnav-V09-00-04".
260
261	October 24th, 2007 - J.Apostolakis (geomnav-V09-00-03a)
262	----------------------------------
263	- G4PathFinder: fix to now set 'fNoGeometriesLimiting' in DoNextLinearStep()
264	when WhichLimited() is not called, i.e. in case of one navigator
265	optimisation.
266	- Tag based on "geomnav-V09-00-03".
267
268	October 18th, 2007 - G.Cosmo (geomnav-V09-00-04)
269	----------------------------
270	- Added new specific navigation for regular structures and phantoms.
271	New classes: G4RegularNavigation, G4PhantomParameterisation (by P.Arce).
272	Added cases to G4Navigator. Added dependency on "materials" module.
273
274	October 12th, 2007 - J.Apostolakis (geomnav-V09-00-03)
275	----------------------------------
276	- G4PathFinder: added new methods GetNumberGeometriesLimitingStep()
277	and GetMinimumStep() needed by G4CoupledTransportation to see whether
278	to relocate.
279
280	September 25th, 2007 - G.Cosmo (geomnav-V09-00-02)
281	------------------------------
282	- Some code cleanup in G4PathFinder. Switch off additional optimisation
283	for safety in method DoNextLinearStep().
284	- Set 'fRecomputeFactor' in G4SafetyHelper to 0.0, to switch off internal
285	optimisation and allow for reproducibility of steps (A.Howard).
286
287	July 12th, 2007 - J.Apostolakis (geomnav-V09-00-01)
288	-------------------------------
289	- Restores fixes/improvements of geomnav-V08-03-07
290	- G4PathFinder: includes fix for result of ObtainSafety(), used in
291	CoupledTransportation.
292
293	July 12th, 2007 - J.Apostolakis (geomnav-V09-00-00)
294	-------------------------------
295	- G4PathFinder:
296	o Include correction to signature of method PrepareNewTrack().
297	(This was done on a branch for this class in order to keep only
298	development of geomnav-V08-03-06)
299	- G4PropagatorInField:
300	o Included revisions and fixes for G4PropagatorInField of June 8th.
301	- This tag is based on "geomnav-V08-03-06" and does NOT include the
302	revisions of "geomnav-V08-03-07".
303
304	July 5th, 2007 - G.Cosmo
305	------------------------
306	- G4PathFinder:
307	o Corrected signature to method PrepareNewTrack().
308	Resolves linking problems detected on SUN-CC platform.
309	- Changes included in tag "geomnav-V08-03-02c", included in relase 9.0.p01.
310
311	June 8th, 2007 - T.Nikitina
312	---------------------------
313	- G4PropagatorInField:
314	o Put in the constructor creation of array of FieldTracks used in
315	LocateInterSectionPoint().
316	o Change in ReEstimateNewPoint() in order to handle cases with zero step
317	caused by diffCurve=0.
318	o In case of proposed step less than tolerance, now return 'kInfinity'
319	as per convention of geometry instead of 'DBL_MAX'.
320	(by J.Apostolakis, May 18th 2007)
321	- Changes included in tag "geomnav-V08-03-02b", included in release 9.0.
322
323	June 5th, 2007 - J.Apostolakis (geomnav-V08-03-07)
324	------------------------------
325	- G4PathFinder:
326	o New method to return the safety sphere last calculated for
327	a PreStep point (it could be a previous one - due to optimasation).
328	>> If last step(s) were smaller than safety, then for a linear
329	track (no field or no charge) Navigator's ComputeSafety is not
330	called. The older PreStep (previous step or some steps back
331	in case of many small steps) is stored for this - and provided.
332	o ComputeStep() still returns current PreStep point's safety (must).
333	o Revisions are to make this (used by CoupledTransportation) more
334	compatible with the old direct use of G4Navigator by G4Transportation.
335
336	May 29th, 2007 - J.Apostolakis (geomnav-V08-03-06)
337	------------------------------
338	- G4Navigator
339	o Fixed ComputeSafety: wrong coordinates used (last tag only).
340	For certainty reinstated LocateGlobalPointWithinVolume (for now).
341	o Corrected calculation of fStepEndPoint (in ComputeStep)
342	for case of step not limited by geometry
343	- G4PathFinder
344	o PrepareNewTrack: calls to re-initialise SafetyHelper (reset safety)
345	o ReLocate: Corrected check of move (avoid one side effect on stored safety)
346	--> ComputeSafety still results individual navigators' values.
347
348	May 24th, 2007 - J.Apostolakis (geomnav-V08-03-05)
349	------------------------------
350	- G4PathFinder: 1 correction and 2 optimisations:
351	o PrepareNewTrack() clear safety - to avoid potential problems in overlaps.
352	o DoNextLinearStep() only calls ComputeStep() for a navigator whose safety
353	greater than the step.
354	o DoNextCurvedStep(), if there's one geometry, no longer calls
355	ComputeSafety() at start.
356	- G4Navigator ComputeSafety:
357	o Corrected it to address use at non-endpoint
358	o Replaced call to LocateGlobalPointWithinVolume() with calls to
359	sub-navigators.
360
361	May 21st, 2007 - G.Cosmo
362	------------------------
363	- Made 'fVerbose' protected in G4Navigator, reused in G4MultipleNavigator.
364	- Some cleanup in G4MultipleNavigator implementation.
365	- Make G4PathFinder singleton definition canonical.
366	- Added method CheckPointExiting() in G4AuxiliaryNavServices utility
367	class (by P.Arce).
368
369	May 19th, 2007 - J.Apostolakis (geomnav-V08-03-04)
370	------------------------------
371	- Corrections and additions in G4PathFinder:
372	1) Added calculation of start-point safety in DoNextCurvedStep
373	2) Corrected GetCurrentSafety() - uses mininum of 1)
374	3) Added method to obtain safety of one navigator (after call to all).
375	4) Deleted obsolete data member 'fMinSafety'.
376	5) If only one geometry, do not call WhichLimited in DoNextLinearStep (optimisation)
377	6) ComputeSafety: save the values of isotropic safety for each navigator
378
379	May 18th, 2007 - A.Howard (geomnav-V08-03-03)
380	------------------------
381	- Fixed return value for G4PathFinder::ComputeStep in case of
382	step smaller than tolerance (now kInfinity): fixes one PathFinder issue (JA).
383	- Added compiler flags for verbosity in G4PathFinder.cc
384	- Added compiler flags for verbosity in G4MultiNavigator.cc
385
386	May 18th, 2007 - G.Cosmo (geomnav-V08-03-02)
387	------------------------
388	- Use kAngTolerance and kRadTolerance from G4GeometryTolerance class.
389	- Coworks with tag "global-V08-03-03".
390
391	May 16th, 2007 - G.Cosmo (geomnav-V08-03-01)
392	------------------------
393	- Introduced new class G4ErrorPropagationNavigator, a specialised navigator
394	for performing double navigation in the detector geometry and on the
395	target surface for error propagation (by P.Arce).
396	- Fixed bug in G4GeomTestSegment in case of TestPoint on the surface,
397	reducing cases of reported spurious overlaps.
398	- Coworks with tag "global-V08-03-02".
399
400	May 16th, 2007 - J.Apostolakis (geomnav-V08-03-00a)
401	------------------------------
402	- Moved to G4PathFinder version without extra prints
403
404	April 26th, 2007 - G.Cosmo (geomnav-V08-03-00)
405	--------------------------
406	- Use call to G4GeometryTolerance instead of kCarTolerance where needed.
407	- Revised data members in G4SafetyHelper to conform to convention.
408	- Requires tag "global-V08-03-00" and related tag set.
409
410	April 26th, 2007 - T.Nikitina (geomnav-V08-02-03)
411	-----------------------------
412	- Fixed case of out of range access in G4GeomTestSegment responsible for
413	crashes observed when recursive-grid test for overlaps was run.
414	Addressing problem report #784.
415
416	April 20th, 2007 - G.Cosmo (geomnav-V08-02-02)
417	--------------------------
418	- Some cleanup and minor cosmetics ...
419
420	April 12st, 2007 - V.Ivanchenko
421	-------------------------------
422	- G4SafetyHelper become a unique class, which can be accessed via
423	G4TransporationManager. Depending on type of navigation (single
424	world or multiple navigation) it uses mass navigator or G4PathFinder.
425	All calls from EM processes to geometry are provided by G4SafetyHelper.
426	- G4TransportationManager: added G4SafetyHelper.
427	- G4PathFinder: initialisation of G4SafetyHelper.
428	- Tagged "geomnav-V08-02-02-beta2".
429
430	March 31st, 2007 - J. Apostolakis
431	---------------------------------
432	- G4Navigator:
433	o New method CheckNextStep() makes a trial step, without
434	changing the state of the Navigator (to be verified).
435	It is a variant of ComputeStep, whose signature it shares.
436	- Tagged "geomnav-V08-02-02-beta1".
437
438	February 13th, 2007 - J.Apostolakis
439	-----------------------------------
440	- G4Navigator:
441	o Improvement for creating touchable history when located outside world.
442	Retain whether last point was located outside, and if so call default
443	TouchableHistory constructor (that initialised world to null).
444	NOTE: testing found problems with SteppingManager::SetInitialStep()
445	as the Vertex physical volume was not set. Protection is potentially
446	required, or bigger issue to be resolved.
447	Currently, changes in G4Navigator.hh,cc are safe, but the fix in .icc is
448	temporarly suspended and NOT included.
449	- Attempted fix created Dec 7th, 2006
450
451	February 13th, 2007 - J.Apostolakis (geomnav-V08-02-01)
452	-----------------------------------
453	- G4PropagatorInField:
454	o Implemented ClearPropagatorState() to clear all the track-dependent
455	state (incl. safety, zero-steps, loop flag ...).
456	** Calling this is mandatory for each new track because in the case of
457	geometry overlaps, the safety can be easily inconsistent (and/or
458	incorrect) otherwise
459	** Must be called from G4Transportation (or alternatives) !!
460	- Fix created Jan 25th, 2007
461
462	January 31st, 2007 - G.Cosmo (geomnav-V08-02-00)
463	----------------------------
464	- G4Navigator: forcing call to CheckOverlaps() on the current volume
465	before event abortion for cases of stuck tracks.
466	- Requires tag "geommng-V08-02-00".
467
468	November 23rd, 2006 - J.Apostolakis (geomnav-V08-01-08)
469	-----------------------------------
470	- G4PathFinder:
471	o Fix when report a problem only if move > safety (additional check).
472	o Revised condition for extra checking against safety.
473	o Many small and cosmetic changes in debug printing.
474
475	November 18th, 2006 - J.Apostolakis (geomnav-V08-01-07)
476	-----------------------------------
477	- G4PathFinder:
478	o Fix for problem when step is fully taken.
479	Note: this occurs due to optimisation in PiF that avoids calling
480	G4(Multi)Navigator!!
481	o Function LimitedString( ELimited lim ) enables printing this enum
482	o Improved printing in IntersectChord. Deleted/simplified few prints in
483	ComputeStep().
484	- G4MultiNavigator: cleanup, cosmetics
485
486	November 13th, 2006 - G.Cosmo (geomnav-V08-01-06)
487	-----------------------------
488	- Fixed compilation warnings and some cleanup ...
489
490	November 11th, 2006 - J.Apostolakis (geomnav-V08-01-05)
491	-----------------------------------
492	- G4PathFinder improvements for parallel Navigation
493	o ComputeStep method signature extended to add volume
494	o Use G4MultiNavigator for tracking in field.
495	- G4MultiNavigator:
496	o Several fixes, primarily for taking care of condition of
497	geometry limited step.
498
499	November 11th, 2006 - J.Apostolakis (geomnav-V08-01-04)
500	-----------------------------------
501	- G4PropagatorInField:
502	o Refined fix in LocateIntersectionPoint(), to subdivide
503	in case it cannot find intersection point quickly (T.Nikitina).
504	Second version, with several levels of cutting.
505	o NOTE: Special tags made (later) not including the Developments in
506	G4TransportationManager, G4PathFinder, G4SafetyHelper for parallel
507	navigation. i.e. - based on tag "geomnav-V08-01-03".
508
509	November 11th, 2006 - J.Apostolakis
510	-----------------------------------
511	- Created G4MultiNavigator class and utilised it from G4PathFinder
512	to implement curved trajectory parallel navigation.
513
514	November 10th, 2006 - J.Apostolakis (geomnav-V08-01-03)
515	-----------------------------------
516	- G4PropagatorInField:
517	o Fix in LocateIntersectionPoint(), to subdivide in case it cannot find
518	intersection point quickly (T.Nikitina).
519	First version, only one level of cutting
520	o NOTE: Special tags made (later) not including the Developments in
521	G4TransportationManager, G4PathFinder, G4SafetyHelper for parallel
522	navigation. i.e. - based on tag "geomnav-V08-01-02".
523
524	November 9th, 2006 - J.Apostolakis
525	-----------------------------------
526	- G4SafetyHelper:
527	o Changed default value of 'fUseParallelGeometries' to 'false'.
528	This is the default, except when using parallel geometries.
529	Value 'true' will become the default.
530
531	November 4th, 2006 - M.Asai
532	---------------------------
533	- G4TransportationManager:
534	o added new method SetWorldForTracking() to enable change of world from
535	the RunManager.
536
537	October 31st, 2006 - J.Apostolakis
538	----------------------------------
539	- G4SafetyHelper
540	o Added new class variable 'fUseParallelGeometries', to enable
541	it to work call G4Navigator of Mass geometry directly, in
542	the case of single geometry (when G4PathFinder is disabled).
543	o Default value is currently 'true' --> for parallel navigation development.
544	- G4PathFinder
545	o Improved the code that checks within relocation whether position
546	is proposed to be moved outside safety sphere from endpoint.
547
548	October 26th, 2006 - G.Cosmo (geomnav-V08-01-02)
549	----------------------------
550	- G4Navigator:
551	o Added inline methods EnteredDaughterVolume() and ExitedMotherVolume() to
552	allow for verification of a point entering a daughter volume or exiting
553	the mother volume.
554	o Made LocateGlobalPointAndSetup() method virtual. Moved to non virtual
555	and inline LocateGlobalPointAndUpdateTouchableHandle() method.
556	o Moved 'fHistory' data member to protected to aloow for more complete
557	subclassing.
558	o Minor cosmetics to recently introduced printout diagnostics in
559	ComputeSafety() method.
560	- G4TransportationManager:
561	o Added methods to access the list of the registered worlds.
562	- NOTE: this tag does NOT include the recent developments introduced for
563	G4PathFinder. It resumes from tag "geomnav-V08-00-01"; anything else
564	introduced after it, except for changes in G4Navigator, is NOT included !
565
566	October 25th, 2006 - J.Apostolakis
567	----------------------------------
568	- G4PathFinder: fixed initialisation of cached value for the
569	G4TransportationManager to cope with singletons.
570
571	October 16th, 2006 - J.Apostolakis (geomnav-V08-01-01)
572	----------------------------------
573	- G4Navigator: moved debug printing behind fVerbose conditions
574
575	October 12th, 2006 - J.Apostolakis (geomnav-V08-01-00)
576	----------------------------------
577	- New class G4SafetyHelper to aid multiple scattering inn
578	determining the correct Mass geometry step (via PathFinder)
579	and all-geometry safety.
580	- Several revisions, fixes to G4PathFinder.
581
582	June 8th, 2006 - J.Apostolakis (geomnav-V08-00-06)
583	------------------------------
584	- G4PathFinder:
585	o New method 'ComputeSafety' to compute safety at endpoint of last step.
586
587	June 2nd, 2006 - J.Apostolakis (geomnav-V08-00-05)
588	------------------------------
589	- G4PathFinder:
590	o New method ReLocate() for non-Transportation classes to call when moving
591	the endpoint of a particle. Uses LocateGlobalPointWithinVolume() method
592	of the navigators.
593	o Small fixes and protection of debug printing with Verbose flag.
594	o Default verbose level is now 0.
595
596	May 28th, 2006 - J.Apostolakis (geomnav-V08-00-04)
597	------------------------------
598	- G4PathFinder:
599	o Check whether a process shifted the position since the last step.
600	o Corrected checking for 'Unique', i.e. one process limiting step.
601	o Revised printing (more information, some protected by verbose flag).
602
603	May 27th, 2006 - J.Apostolakis (geomnav-V08-00-03)
604	------------------------------
605	- G4PathFinder revised significantly:
606	o Workaround for problem of CreateHistory() when outside world.
607	o Revised for new counting of Navigator IDs (M.Asai).
608	o Added MovePoint() method that signals if it moved.
609	o Added state to cope with cases where a full step is taken,
610	i.e. to cope with steps that return kInfinity:
611	New state:
612	RelocatedPoint - to show if it is moved;
613	TrueMinStep - finite whereas reported can be kInfinity.
614	and to aid in clarifying the state of the (singleton) object:
615	LastStepNo - already kept in one method (static), now exposed;
616	CurrentStepNo - mostly for debugging and printing out.
617	o Small improvements in tests.
618
619	May 23rd, 2006 - J.Apostolakis (geomnav-V08-00-02)
620	------------------------------
621	- Added new prototype class G4PathFinder to coupled navigation
622	in parallel geometries.
623
624	May 22nd, 2006 - G.Cosmo (geomnav-V08-00-01)
625	------------------------
626	- Extended G4TransportationManager to handle multiple navigators.
627	Preserved interface for navigation in mass/tracking geometry.
628	- Added activation flag to G4Navigator and related accessor methods.
629
630	Feb 8th, 2006 - J.Apostolakis (geomnav-V08-00-00)
631	-----------------------------
632	- Addressing problem with convergence in LocateIntersectionPoint()
633	of G4PropagatorInField (problem identified by Atlas, observed when
634	requesting high precision, i.e. small values of eps_min/max, delta_one_step,
635	due e.g. to need for small delta_intersection):
636	o First solution by increasing maximum iterations (from 100 to 10,000).
637	o Until correct information can be returned, an Exception is thrown
638	in case of too many iterations.
639	o Warn in case over 1000 iterations, to let user see difficulty.
640	- This fix is an interim solution, in lieu of improving the algorithm
641	for location (or returning correct incomplete progress).
642
643	Nov 24th, 2005 - J.Apostolakis (geomnav-V07-01-02)
644	------------------------------
645	- Revised G4ParameterisedNavigation, to use new interface for
646	ComputeMaterial(). Now no longer needing 'Physical Touchable'.
647
648	Sep 19th, 2005 - G.Cosmo (geomnav-V07-01-01)
649	------------------------
650	- G4DrawVoxels: removed unnecessary 'panic' message in ComputeVoxelPolyhedra()
651	and some code cleanup.
652
653	Jul 25th, 2005 - G.Cosmo (geomnav-V07-01-00)
654	------------------------
655	- Some cleanup and cosmetic changes for Software Reference Manual.
656
657	Jun 14th, 2005 - J.Apostolakis (geomnav-V07-00-00)
658	------------------------------
659	- Added ability to use Nested Parameterisations to Parameterised Navigation
660	Coworks with tag "geomvol-V07-00-01".
661
662	Dec 2nd, 2004 - G.Cosmo (geomnav-V06-02-08)
663	-----------------------
664	- Implemented migration to <cmath> for standard mathematical functions.
665
666	Nov 24th, 2004 - G.Cosmo (geomnav-V06-02-07)
667	------------------------
668	- Fix in G4ReplicaNavigation::DistanceToOutPhi() for the case of phi
669	sections on convex surfaces. Fixes problem report #651.
670
671	Nov 19th, 2004 - J.Apostolakis (geomnav-V06-02-06)
672	------------------------------
673	- New access method in G4Navigator for SeverityOfZeroStepping().
674
675	Nov 17th, 2004 - G.Cosmo (geomnav-V06-02-05)
676	------------------------
677	- Allow consecutive corrections for stuck tracks in G4Navigator::ComputeStep()
678	up to 10 times before aborting the event.
679
680	Sep 28th, 2004 - G.Cosmo (geomnav-V06-02-04)
681	------------------------
682	- Invoke G4LogicalVolume::UpdateMaterial() instead of SetMaterial() for
683	parameterised navigation in G4Navigator and G4ParameterisedNavigation
684	(M.Asai).
685	- Coworks with tag "geommng-V06-02-02".
686
687	Sep 13th, 2004 - G.Cosmo (geomnav-V06-02-03)
688	------------------------
689	- G4Navigator: corrected computation of fGrandMotherExitNormal in ComputeStep()
690	in the case where a not valid exit-normal exists.
691
692	Sep 11th, 2004 - G.Cosmo (geomnav-V06-02-02)
693	------------------------
694	- Dump out contents from the solid when a fatal G4Exception is thrown from
695	the navigators in ComputeStep().
696	Modified files G4NormalNavigation.cc, G4ParameterisedNavigation.cc,
697	G4ReplicaNavigation.cc, G4VoxelNavigation.cc.
698
699	Aug 31st, 2004 - D.C.Williams (geomnav-V06-02-01)
700	-----------------------------
701	- G4GeomTestSegment: fix to correctly determine whether starting trajectory
702	is entering or exiting the solid when the starting point is on a surface.
703	Added additional tests on solid consistencies (from roundoff sometimes) to
704	avoid incorrect overlap warnings. Addresses problem reports #610 and #652.
705
706	Jun 29th, 2004 - G.Cosmo (geomnav-V06-02-00)
707	------------------------
708	- Fixed zero step-length problem in G4ReplicaNavigation::ComputeStep()
709	for cases where different replica types are coincident. Resolves
710	problem report #633.
711	- G4NormalNavigation: added extra verbosity to print out information
712	for each solid which returns a 'lowest-yet' step, including the
713	mother volume. It is activated by setting verbose level to 2 or
714	more (J.Apostolakis).
715
716	Jun 18th, 2004 - G.Cosmo (geomnav-V06-01-03)
717	------------------------
718	- Enhanced check for null step in G4Navigator::ComputeStep().
719	Now attempting a corrective action after 10 consecutive zero steps.
720	Event gets aborted after 25 zero steps.
721
722	Jun 15th, 2004 - G.Cosmo (geomnav-V06-01-02)
723	------------------------
724	- Relax exception in G4Navigator::ComputeStep() for stuck tracks.
725	Event gets aborted after 25 zero steps.
726
727	Jun 11th, 2004 - G.Cosmo (geomnav-V06-01-01)
728	------------------------
729	- Added check to G4Navigator to count the number of steps with zero length
730	and issue an exception for tracks that get stuck in a loop (J.Apostolakis).
731	- Modified GNUmakefile to define G4GEOMETRY_ALLOC_EXPORT flag for DLLs
732	build on Windows.
733
734	May 17th, 2004 - G.Cosmo (geomnav-V06-01-00)
735	------------------------
736	- Added more verbosity on solids response for navigators (optimised/not
737	optimised) if "check_mode" state is combined with verbose level-1.
738
739	Mar 11th, 2004 - G.Cosmo (geomnav-V06-00-02)
740	------------------------
741	- Added "check_mode" state for navigators. The state can be activated by
742	a new UI command (geometry/navigator/check_mode [true/false]) and will
743	force more strict and less tolerant checks in step/safety computation to
744	verify the correctness of solids' response in the geometry.
745	- Reorganised verbosity levels. Added more useful information activated
746	when in G4VERBOSE mode and verbosity level selected.
747	Fixed output formatting when entering/exiting verbose blocks.
748
749	Feb 27th, 2004 - G.Cosmo (geomnav-V06-00-01)
750	------------------------
751	- G4Navigator.cc:
752	o Fixed old outstanding bug in ComputeStep() for the location of the
753	the local point in the calculation of a valid exit normal. (V.Grichine)
754
755	Feb 9th, 2004 - J.Apostolakis (geomnav-V06-00-00)
756	------------------------------
757	- G4PropagatorInField.cc:
758	o ReEstimateEndpoint: Changed to cope with a failure of AccurateAdvance,
759	by calling it iteratively up maximum 20 times.
760	o SetVerboseLevel, now forwards the verbosity (minus 3) to integration driver
761
762	Dec 11th, 2003 - J.Apostolakis (geomnav-V05-02-15)
763	------------------------------
764	- G4PropagatorInField.cc:
765	o LocateIntersectionPoint: Refined re-setting of finalSection.
766	--> Endpoint recalculation is returned only for final section.
767	(trial fix in -14 is replaced by above code)
768	o Fixed ReEstimateEndPoint which ignored return code of AccurateAdvance
769	and moved to short end-point for long requests
770	It now leaves the endpoint unchanged, when it cannot improve it.
771	o Few format changes for PrintStatus
772
773	Dec 10th, 2003 - J.Apostolakis (geomnav-V05-02-14)
774	------------------------------
775	- G4PropagatorInField.cc on top of latest (not 1.7):
776	o Fix for the case where two previous corrections are 'operational'
777	Problem if the current endpoint is not the final one, and it has been
778	recalculated, and we need to go beyond the current section to the
779	final one -- the recalcuted endpoint no longer valid!
780
781	Dec 10th, 2003 - J.Apostolakis (geomnav-V05-02-13)
782	------------------------------
783	- G4PropagatorInField.cc:
784	o Gone back to version 1.7, without the fix in LocateIntersectionPoint
785	for the "long-standing error".
786
787	Dec 5th, 2003 - G.Cosmo - (geomnav-V05-02-12)
788	------------------------
789	- G4TransportationManager.cc:
790	o removed initialisation of allocators for navigation levels, where they
791	were introduced as workaround for solving static initialisation a long
792	time ago. Now moved to "volumes" module, where they should belong, in
793	G4TouchableHistory.cc.
794	- Restored original unit-tests, using inherited navigator.
795	--> Requires geomvol-V05-02-08
796
797	Dec 4th, 2003 - J.Apostolakis (geomnav-V05-02-11)
798	------------------------------
799	- G4PropagatorInField.cc
800	o Corrected placement of #endif for two #ifdef VERBOSE
801
802	Dec 2nd, 2003 - J.Apostolakis (geomnav-V05-02-10)
803	------------------------------
804	- G4PropagatorInField[.hh.cc]:
805	o Fixed LocateIntersectionPoint for long-standing error.
806	A section of the chord was not considered in use case where
807	a previous chord at first appeared to have an intersection, but did not.
808
809	Nov 26th, 2003 - J.Apostolakis (geomnav-V05-02-09)
810	------------------------------
811	- G4PropagatorInField[.hh.cc]:
812	o Added argument Method LocateIntersectionPoint G4bool& recalculatedEndPt
813	to return 'true' if the endpoint has been recalculated.
814	This fixes a problem that can occasionally cause the skipping of a volume
815	boundary - in the case when a re-integration was done near a boundary,
816	because the new endpoint was previously not passed back.
817	o ComputeStep also changed to accept above recalculation.
818	o New method GetVerboseLevel(), closer to std naming than Verbose()
819
820	Nov 14th, 2003 - J.Apostolakis (geomnav-V05-02-08)
821	------------------------------
822	- Retagged the files of tag "geomnav-V05-02-07", due to tagging with same
823	name incorrectly files in another directory and, as such confusing Bonsai.
824
825	Nov 13th, 2003 - J.Apostolakis (geomnav-V05-02-07)
826	------------------------------
827	- G4PropagatorInField[.hh.icc.cc]:
828	o Pass safety sphere information to G4ChordFinder for optimisation
829	o Including G4ChordFinder.hh only in .cc file
830	- Requires and coworks with "field-V05-02-08" tag.
831
832
833	Nov 10th, 2003 - G.Cosmo (geomnav-V05-02-06)
834	------------------------
835	- G4Navigator[.hh.icc.cc] - methods review:
836	o Removed obsolete methods: IsExitNormalValid(), GetLocalExitNormal().
837	o Renamed method LocateGlobalPointAndSetup(p,v,history) to
838	ResetHistoryAndLocate(p,v,history).
839	o Moved to protected the following methods: GetCurrentLocalCoordinate(),
840	ComputeLocalPoint(), ComputeLocalAxis(), NetTranslation(),
841	NetRotation(), EnteredDaughterVolume().
842	o Fixed consistency of inline/not-inline implementations of methods.
843	- Coworks with tag "tracking-V05-02-03".
844
845	Nov 6th, 2003 - J.Apostolakis (geomnav-V05-02-05)
846	-----------------------------
847	- G4PropagatorInField[.hh.icc.cc]:
848	o Implements move of EpsilonMin / Max to G4FieldManager.
849	- Requires and coworks with "field-V05-02-04" or later tag.
850
851	Nov 6th, 2003 - G.Cosmo (geomnav-V05-02-04)
852	-----------------------
853	- G4Navigator[.hh.icc.cc]:
854	o Made relevant methods virtual to verify performance impact.
855	If tests will behave reasonably, a further refinement in the
856	design of the class will be applied, in view of a more consistent
857	design review next year.
858
859	Nov 3rd, 2003 - G.Cosmo (geomnav-V05-02-03)
860	-----------------------
861	- Code cleanup and headers inclusion review
862	(replaced by forward declarations where necessary).
863	- Added build system to tests. Cleared compilation warnings.
864
865	Oct 29th, 2003 - J.Apostolakis (geomnav-V05-02-02)
866	------------------------------
867	- G4PropagatorInField:
868	Added option to turn On/Off the optimisation of using the safety
869	in calling G4Navigator.
870	- Unit tests: moved test testG4NavigatorX, X=1,2,3,4,5,6 here from
871	"volumes" module.
872
873	Oct 24th, 2003 - G.Cosmo (geomnav-V05-02-01)
874	------------------------
875	- Migrated calls to G4Exception to new scheme.
876	- Fixed compilation warning in G4PropagationInField.
877
878	Sep 29th, 2003 - G.Cosmo (geomnav-V05-02-00)
879	------------------------
880	- Created.
881	Imported classes from "volumes", "management" and "verification" modules:
882	G4AuxiliaryNavServices[.hh.icc] - from geometry/volumes
883	G4GeometryMessenger[.hh.cc] - " "
884	G4Navigator[.hh.icc.cc] - " "
885	G4NormalNavigation[.hh.icc.cc] - " "
886	G4ParameterisedNavigation[.hh.icc.cc] - " "
887	G4PropagatorInField[.hh.icc.cc] - " "
888	G4ReplicaNavigation[.hh.icc.cc] - " "
889	G4TransportationManager[.hh.icc.cc] - " "
890	G4VoxelNavigation[.hh.icc.cc] - " "
891	G4DrawVoxels[.hh.cc] - from geometry/management
892	G4GeomTest*[.hh.cc] - from geometry/verification
893	- Cleared call to PV->Setup() according to changes in G4VPhysicalVolume.
894	Affected files: G4Navigator[.icc.cc], G4ParameterisedNavigation[.icc.cc],
895	G4VoxelNavigation[.icc.cc], G4ReplicaNavigation[.icc.cc],
896	G4NormalNavigation[.icc.cc].
897	- G4DrawVoxels: retrieve top transformation through touchable history in
898	method DrawVoxels(). Removed old method GetAbsoluteTransformation().
899	- G4GeomTestErrorList.cc: retrieve top transformation through touchable
900	history in method FindGlobalCoordinateSystem().
901
902	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
903	Imported History file from old geometry/verification module
904	+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
905
906	May 20th, 2003 G.Cosmo (geomver-V05-01-00)
907	- G4GeomTestVolume[.hh.cc]:
908	o Added methods TestRecursiveLine() and TestRecursiveCylinder() for
909	allowing recursion on line_test and cylinder_test respectively.
910	o Introduced ability to control depth and starting level of recursion.
911
912	Jul 30th, 2002 G.Cosmo (geomver-V04-01-00)
913	- G4GeomTestVolume.cc: fixed recursive call to G4GeomTestVolume passing also
914	'tolerance' as argument in the recursive test algorithm.
915
916	Apr 19th, 2002 G.Cosmo (geomver-V04-00-00)
917	- Moved inline constructors and destructors to no inline.
918	Affected files: G4GeomTestStreamLogger[.hh.cc].
919
920	Oct 24th, 2001 G.Cosmo (geomver-V03-02-02)
921	- Fixed compilation error and warnings on HP-aCC. Modified files:
922	G4GeomTestVolume.cc, G4GeomTestStreamLogger.cc.
923
924	Oct 24th, 2001 G.Cosmo (geomver-V03-02-01)
925	- Moved messenger to geometry/volumes and renamed G4GeometryMessenger.
926	- Removed dependencies from intercoms and geometry/volumes.
927
928	Oct 22nd, 2001 G.Cosmo (geomver-V03-02-00)
929	- Added "/geomtest/tolerance" command to set custom error tolerance.
930	Added Set/GetTolerance() methods to G4GeomTestVolume class.
931	- Introduced additional diagnostics in G4GeomTestStreamLogger to report
932	in case no intersections/overlaps are detected.
933
934	Oct 16th, 2001 G.Cosmo
935	- Added messenger for geometry overlaps testing.
936	- General source code formatting.
937	- G4TestGeom* classes implementation by D.C.Williams (UCSC, BaBar).

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