class AliPHOSGeoUtils: public TNamed

 default ctor
 must be kept public for root persistency purposes, but should never be called by the outside world

 ctor only for normal usage

 dtor

 Converts the absolute numbering into the following array
  relid[0] = PHOS Module number 1:fNModules
  relid[1] = 0 if PbW04
           = -1 if CPV
  relid[2] = Row number inside a PHOS module
  relid[3] = Column number inside a PHOS module

 Converts the relative numbering into the absolute numbering
 EMCA crystals:
  absId = from 1 to fNModules * fNPhi * fNZ
 CPV pad:
  absId = from N(total PHOS crystals) + 1
          to NCPVModules * fNumberOfCPVPadsPhi * fNumberOfCPVPadsZ

 Converts the relative numbering into the local PHOS-module (x, z) coordinates

 converts local PHOS-module (x, z) coordinates to absId

Evaluates RelId of the crystall with given coordinates

 Converts the absolute numbering into the global ALICE coordinate system

 Transforms a global position to the local coordinate system
 of the module
Return to PHOS local system

Converts position in global ALICE coordinates to relId
returns false if x,z coordinates are beyond PHOS
distande to PHOS surface is NOT calculated

 Tells if a particle enters PHOS and evaluates hit position

 calculates the impact coordinates on PHOS of a neutral particle
 emitted in the vertex vtx[3] with direction vec(p) in the ALICE global coordinate system

 calculates the impact coordinates on PHOS of a neutral particle
 emitted in the vertex vtx[3] with direction theta and phi in the ALICE global coordinate system

Calculates vector pointing from vertex to current poisition in module local frame
Note that PHOS local system and ALICE global have opposite z directions

Provides shift-rotation matrix for module mod

Provides shift-rotation matrix for strip unit of the module mod

Provides shift-rotation matrix for CPV of the module mod

Provides shift-rotation matrix for PHOS (EMC+CPV)

Fills pointers to geo matrixes

calculates vector from vertex to current point in module local frame