class AliTRDgeometry: public AliGeometry

 AliTRDgeometry default constructor

 AliTRDgeometry destructor

 Creates the array of AliTRDpadPlane objects

 Creates an AliTRDpadPlane object

 Create the TRD geometry


 Names of the TRD volumina (xx = detector number):

   Volume (Air) wrapping the readout chamber components
     UTxx    includes: UAxx, UDxx, UFxx, UUxx

   Lower part of the readout chambers (drift volume + radiator)
     UAxx    Aluminum frames                (Al)

   Upper part of the readout chambers (readout plane + fee)
     UDxx    Wacosit frames of amp. region  (Wacosit)
     UFxx    Aluminum frame of back panel   (Al)

   Services on chambers (cooling, cables, MCMs, DCS boards, ...)
     UUxx    Volume containing the services (Air)

   Material layers inside sensitive area:
     Name    Description                     Mat.      Thick.   Dens.    Radl.    X/X_0

     URMYxx  Mylar layers (x2)               Mylar     0.0015   1.39     28.5464  0.005%
     URCBxx  Carbon layer (x2)               Carbon    0.0055   1.75     24.2824  0.023%
     URGLxx  Glue on the carbon layers (x2)  Araldite  0.0065   1.12     37.0664  0.018%
     URRHxx  Rohacell layer (x2)             Rohacell  0.8      0.075    536.005  0.149%
     URFBxx  Fiber mat layer                 PP        3.186    0.068    649.727  0.490%

     UJxx    Drift region                    Xe/CO2    3.0      0.00495  1792.37  0.167%
     UKxx    Amplification region            Xe/CO2    0.7      0.00495  1792.37  0.039%
     UWxx    Wire planes (x2)                Copper    0.00011  8.96     1.43503  0.008%

     UPPDxx  Copper of pad plane             Copper    0.0025   8.96     1.43503  0.174%
     UPPPxx  PCB of pad plane                G10       0.0356   2.0      14.9013  0.239%
     UPGLxx  Glue on pad planes              Araldite  0.0923   1.12     37.0664  0.249%
             + add. glue (ca. 600g)          Araldite  0.0505   1.12     37.0663  0.107%
     UPCBxx  Carbon fiber mats (x2)          Carbon    0.019    1.75     24.2824  0.078%
     UPHCxx  Honeycomb structure             Aramide   2.0299   0.032    1198.84  0.169%
     UPPCxx  PCB of readout board            G10       0.0486   2.0      14.9013  0.326%
     UPRDxx  Copper of readout board         Copper    0.0057   8.96     1.43503  0.404%
     UPELxx  Electronics + cables            Copper    0.0029   8.96     1.43503  0.202%

 Create the geometry of the frame of the supermodule

 Names of the TRD services volumina

        USRL    Support rails for the chambers (Al)
        USxx    Support cross bars between the chambers (Al)
        USHx    Horizontal connection between the cross bars (Al)
        USLx    Long corner ledges (Al)

 Create the geometry of the services

 Names of the TRD services volumina

        UTC1    Cooling arterias (Al)
        UTC2    Cooling arterias (Water)
        UUxx    Volumes for the services at the chambers (Air)
        UMCM    Readout MCMs     (G10/Cu/Si)
        UDCS    DCSs boards      (G10/Cu)
        UTP1    Power bars       (Cu)
        UTCP    Cooling pipes    (Fe)
        UTCH    Cooling pipes    (Water)
        UTPL    Power lines      (Cu)
        UTGD    Gas distribution box (V2A)

 Group volumes UA, UD, UF, UU into an assembly that defines the
 alignable volume of a single readout chamber

 Rotates a chambers to transform the corresponding local frame
 coordinates <loc> into the coordinates of the ALICE restframe <glb>.

 Convert plane / stack into detector number for one single sector

 Convert layer / stack / sector into detector number

 Reconstruct the layer number from the detector number

 Reconstruct the stack number from the detector number

 Reconstruct the chamber number from the z position and layer number

 The return function has to be protected for positiveness !!

 Reconstruct the sector number from the detector number

 Returns the pad plane for a given plane <pl> and stack <st> number

 Returns the number of rows on the pad plane

 Returns the number of rows on the pad plane

 Returns the position of the border of the first pad in a row

 Returns the position of the border of the first pad in a column

 Create the matrices to transform cluster coordinates from the
 local chamber system to the tracking coordinate system

 Returns the cluster transformation matrix for a given detector

 Checks whether the given detector is part of the current geometry

 Checks for holes in front of PHOS

 Checks whether position is at the boundary of the sensitive volume