class AliGeomManager: public TObject

 destroy the manager as well as gGeoManager (if it was not attached to fgGeometry)

 initialization
 Load geometry either from a file
 or from the corresponding CDB entry

 Load already active geometry

 default constructor

 dummy destructor

 Get the layer size for layer corresponding to layerId.
 Implemented only for ITS,TPC,TRD,TOF and HMPID

 Get the layer name corresponding to layerId.
 Implemented only for ITS,TPC,TRD,TOF and HMPID

 From detector (layer) name and module number (according to detector
 internal numbering) build the unique numerical identity of that volume
 inside ALICE
 fVolUID is 16 bits, first 5 reserved for layerID (32 possible values),
 remaining 11 for module ID inside det (2048 possible values).
 NO check for validity of given modId inside the layer for speed's sake.

 From detector (layer) name and module number (according to detector
 internal numbering) build the unique numerical identity of that volume
 inside ALICE
 fVolUID is 16 bits, first 5 reserved for layerID (32 possible values),
 remaining 11 for module ID inside det (2048 possible values).
 NO check for validity of given modId inside the layer for speed's sake.

 From detector (layer) name and module number (according to detector
 internal numbering) build the unique numerical identity of that volume
 inside ALICE
 fVolUID is 16 bits, first 5 reserved for layerID (32 possible values),
 remaining 11 for module ID inside det (2048 possible values).
 Check validity of given modId inside the layer.

 From detector (layer) name and module number (according to detector
 internal numbering) build the unique numerical identity of that volume
 inside ALICE
 fVolUID is 16 bits, first 5 reserved for layerID (32 possible values),
 remaining 11 for module ID inside det (2048 possible values).
 Check validity of given modId inside the layer.

 Get the alignment object which corresponds to the symbolic volume name
 symname (in case equal to the TGeo volume path)
 The method is extremely slow due to the searching by string,
 therefore it should be used with great care!!
 This method returns FALSE if the symname of the object was not
 valid neither to get a TGeoPEntry nor as a volume path, or if the path
 associated to the TGeoPNEntry was not valid.

 Loop over all alignable volumes and extract
 the corresponding alignment objects from
 the TGeo geometry

 Returns the alignment object for given volume ID

 Returns pointer to alignment object given its layer and module ID

 Returns the symbolic volume name for given volume ID

 Returns the symbolic volume name given for a given layer
 and module ID

 Check the look-up table which associates the unique numerical identity of
 each alignable volume to the corresponding symbolic volume name.
 The LUT is now held inside the geometry and handled by TGeo.
 The method is meant to be launched when loading a geometry to verify that
 no changes in the symbolic names have been introduced, which would prevent
 backward compatibility with alignment objects.
 To accept both complete and partial geometry, this method skips the check
 for TRD and TOF volumes which are missing in the partial geometry.

 Initialize the look-up table which associates the unique
 numerical identity of each alignable volume to the
 corresponding TGeoPNEntry.
 The LUTs are static; they are created at the creation of the
 AliGeomManager instance and recreated if the geometry has changed

 Get the global transformation matrix for a given PNEntry
 by quering the TGeoManager

 Get the global transformation matrix for a given alignable volume
 identified by its unique ID 'index' by quering the TGeoManager

 Get the global transformation matrix for a given alignable volume
  identified by its symbolic name 'symname' by quering the TGeoManager

 Get the translation vector for a given module 'index'
 by quering the TGeoManager

 Get the rotation matrix for a given module 'index'
 by quering the TGeoManager

 The method sets the matrix passed as argument as the global delta
 (for the volume referred by the unique index) including the displacements
 of all parent volumes in the branch.

 The method sets the matrix passed as argument as the global delta
 (for the volume referred by the alignment object) including the displacements
 of all parent volumes in the brach.

 Get the global transformation matrix (ideal geometry) for a given alignable volume
 The alignable volume is identified by 'symname' which has to be either a valid symbolic
 name, the query being performed after alignment, or a valid volume path if the query is
 performed before alignment.

 The method returns the global matrix for the volume identified by
 'path' in the ideal detector geometry.
 The output global matrix is stored in 'm'.
 Returns kFALSE in case TGeo has not been initialized or the volume
 path is not valid.

 The method returns global matrix for the ideal detector geometry
 using the corresponding TGeoPNEntry as an input.
 The returned pointer should be copied by the user, since its content could
 be overwritten by a following call to the method.
 In case of missing TGeoManager the method returns NULL.

 The method returns global matrix from the ideal detector geometry
 for the volume identified by its index.
 The returned pointer should be copied by the user, since its content could
 be overwritten by a following call to the method.
 In case of missing TGeoManager the method returns NULL.
 If possible, the method uses the LUT of original ideal matrices
 for fast access. The LUT is reset in case a
 new geometry is loaded.

 Get the original translation vector (ideal geometry)
 for a given module 'index' by quering the TGeoManager

 Get the original rotation matrix (ideal geometry)
 for a given module 'index' by quering the TGeoManager

 Get the matrix which transforms from the tracking to the local RS
 The method queries directly the TGeoPNEntry

 Get the matrix which transforms from the tracking r.s. to
 the global one.
 Returns kFALSE in case of error.

 Returns the TGeoPNEntry for the given global volume ID "voluid"

 Returns the TGeoPNEntry for a given layer
 and module ID

 Check for overlaps/extrusions on physical nodes only;
 this overlap-checker is meant to be used to check overlaps/extrusions
 originated by the application of alignment objects.

 Get number of declared alignable volumes in current geometry
 for the given detector "module" passed as a vaild detector name
 if the detector name is invalid return -1

 Set number of declared alignable volumes for given detector in current geometry
 by looping on the list of PNEntries

 Calls AddAlignObjsFromCDBSingleDet for the detectors appearing in
 the list passed as argument (called by AliSimulation and
 AliReconstruction)
 Read the alignment objects from CDB.
 Each detector is supposed to have the
 alignment objects in DET/Align/Data CDB path.
 All the detector objects are then collected,
 sorted by geometry level (starting from ALIC) and
 then applied to the TGeo geometry.
 Finally an overlaps check is performed.

 Adds the alignable objects found in the CDBEntry for the detector
 passed as argument to the array of all alignment objects to be applyed
 to geometry

 Fills array of single detector's alignable objects from CDB

 Read collection of alignment objects (AliAlignObj derived) saved
 in the TClonesArray alObjArray and apply them to gGeoManager

 read collection of alignment objects (AliAlignObj derived) saved
 in the TClonesArray ClArrayName in the file fileName and apply
 them to the geometry

 read collection of alignment objects (AliAlignObj derived) saved
 in the TClonesArray ClArrayName in the AliCDBEntry identified by
 param (to get the AliCDBStorage) and Id; apply the alignment objects
 to the geometry

 read collection of alignment objects (AliAlignObj derived) saved
 in the TClonesArray ClArrayName in the AliCDBEntry identified by
 param (to get the AliCDBStorage) and Id; apply the alignment objects
 to the geometry

 cleans static arrays containing the information on currently loaded geometry