class AliFMDGeometry: public AliGeometry

 singleton access

 Return:
    Singleton

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 CTOR

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 CTOR

 Parameters:
    name Not used

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 Copy CTOR

 Parameters:
    other To copy from

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 Assignment operator

 Parameters:
    other To assig from
 Return:
    reference to this.

 Initialize the the singleton if not done so already

 Find all local <-> global transforms

 Make the geometry.  This delegates to AliFMDGeometryBuilder

 Set active volumes

 Parameters:
    active Active volume id array
    n elements of @a active

 Add an active volume

 Parameters:
    id Register volume @a id to be active

 Check if volume @a vol is marked as active

 Parameters:
    vol Volume ID
 Return:
     @c true if @a vol is declared active

 Get description of a sub-detector

 Parameters:
    i Sub-detector #
 Return:
    Description of sub-detector, or 0

 Get description of a ring, i should be one of 'I' or 'O' (case
 insensitive).  If an invalid parameter is passed, 0 (NULL) is
 returned.

 Parameters:
    i Ring id
 Return:
    Description of ring, or 0

 Enable the ith detector

 Parameters:
    i IF true, enable sub-detector @a i

 Disable the ith detector

 Parameters:
    i IF true, disable sub-detector @a i

 Translate detector coordinates (detector, ring, sector, strip)
 to spatial coordinates (x, y, z) in the master reference frame
 of ALICE.  The member function uses the transformations
 previously obtained from the TGeoManager.

 Parameters:
    detector Detector number
    ring     Ring id
    sector   Sector number
    strip    Strip number
    x        On return, X coordinate
    y        On return, Y coordinate
    z        On return, Z coordinate

 Translate spatial coordinates (x,y,z) in the master reference
 frame of ALICE to the detector coordinates (detector, ring,
 sector, strip).  Note, that if this method is to be used in
 reconstruction or the like, then the input z-coordinate should
  be corrected for the events interactions points z-coordinate,
 like
 @code
 geom->XYZ2Detector(x,y,z-ipz,d,r,s,t);
 @endcode

 Parameters:
    x        X coordinate
    y 	      Y coordinate
    z 	      Z coordinate
    detector On return, Detector number
    ring     On return, Ring id
    sector   On return, Sector number
    strip    On return, Strip number
 Return:
    @c  false of (@a x, @a y, @a z) is not within this
 detector.

 Get global coordinates cooresponding to a rec point.

 Parameters:
    p   Reconstructed point.
    pos On return, the position
    mat On return, the material at @a post

 Get global coordinates cooresponding to a rec point.

 Parameters:
    p   Reconstructed point.
    pos On return, the position

 FIXME: Implement this function to work with outer rings too.

 Check if particle will hit an active detector element.

 @todo implement this function

 Parameters:
    particle Track
 Return:
    @c true if @a particle will hit this detector

 Declare alignable volumes

 Check the volume depth of some nodes, get the active volume
 numbers, and so forth.

 TODO: Here, we should actually also get the parameters of the
 shapes, like the verticies of the polygon shape that makes up the
 silicon sensor, the strip pitch, the ring radii, the z-positions,
 and so on - that is, all the geometric information we need for
 futher processing, such as simulation, digitization,
 reconstruction, etc.

   * @return Get inner description

   * @return Get outer description

   * @return Get FMD1 description

   * @return Get FMD2 description

   * @return Get FMD3 description

   * @return Density @f$ \rho@f$ of silicon

   * @return Get detector offset in paths

   * @return Get sensor offset in paths

   * @return Get ring offset in paths

   * @return Get ring sector in paths

   * @param off Detector off-set set in geometry path

   * @param off Module off-set set in geometry path

   * @param off Ring off-set set in geometry path

   * @param off Sectord off-set set in geometry path

   * Get Array of active volume numbers
   *
   * @return constant reference to active volume numbers

   * Set an external geometry builder
   *
   * @param b Geometry builder

   * Whether we are to use a detailed geometry or not
   *
   * @param det if @c true, make a detailed geometry.

   * @return @c true if geometry is detailed

   * @param ass Whether to use assemblies or not