class HGeomMdc: public HGeomSet

_HADES_CLASS_DESCRIPTION

 HGeomMdc

 Class for geometry of MDC

 Creation of wires:

 The parameters (media, radia, wire distances, ...) to create wires
 (see class HGeomMdcWirePlanes) are read from a parameter ROOT file.
 For each wire the length and position is then calculated and an unique name
 generated.
 All wire planes (sensitive mother volumes) are implemented as TRD1, all
 wires as TUBE filled with a not-sentive medium. The GEANT/ROOT coordinate
 system of both shapes is indentical, but different from the HADES coordinate
 system.

     HADES coordinate system                    TRD1 coordinate system

            Line 1                              xHades = xTrd1
          ----------              ^ (y)         yHades = zTrd1
          \ Layer  /              |             zHades = -yTrd1
 Line 0 -> \ MDC  /  <- Line 2    |
            \____/                |
            Line 3                |
  (x) <--------|-------------------
              0,0