class TGeoChecker: public TObject

 Default constructor

 Constructor for a given geometry

 Destructor

 Print current operation progress.

 Geometry checking. Opional overlap checkings (by sampling and by mesh). Optional
 boundary crossing check + timing per volume.

 STAGE 1: extensive overlap checking by sampling per volume. Stdout need to be
  checked by user to get report, then TGeoVolume::CheckOverlaps(0.01, "s") can
  be called for the suspicious volumes.
 STAGE2 : normal overlap checking using the shapes mesh - fills the list of
  overlaps.
 STAGE3 : shooting NRAYS rays from VERTEX and counting the total number of
  crossings per volume (rays propagated from boundary to boundary until
  geometry exit). Timing computed and results stored in a histo.
 STAGE4 : shooting 1 mil. random rays inside EACH volume and calling
  FindNextBoundary() + Safety() for each call. The timing is normalized by the
  number of crossings computed at stage 2 and presented as percentage.
  One can get a picture on which are the most "burned" volumes during
  transportation from geometry point of view. Another plot of the timing per
  volume vs. number of daughters is produced.
 All histos are saved in the file statistics.root

 Propagate from START along DIR from boundary to boundary until exiting
 geometry. Fill array of hits.

 Score a hit for VOL

 Compute timing per "FindNextBoundary" + "Safety" call. Volume must be
 in the current path.

 Shoot nrays with random directions from starting point (startx, starty, startz)
 in the reference frame of this volume. Track each ray until exiting geometry, then
 shoot backwards from exiting point and compare boundary crossing points.

 Clean-up the mesh of pcon/pgon from useless points

 Check if the 2 non-assembly volume candidates overlap/extrude. Returns overlap object.

 Check illegal overlaps for volume VOL within a limit OVLP by sampling npoints
 inside the volume shape.

 Check illegal overlaps for volume VOL within a limit OVLP.

 Print the current list of overlaps held by the manager class.

--- Draw point (x,y,z) over the picture of the daughers of the volume containing this point.
   Generates a report regarding the path to the node containing this point and the distance to
   the closest boundary.

 Generate a lego plot fot the top volume, according to option.

 Draw random points in the bounding box of a volume.

 Randomly shoot nrays from point (startx,starty,startz) and plot intersections
 with surfaces for current top node.

 shoot npoints randomly in a box of 1E-5 arround current point.
 return minimum distance to points outside
 make sure that path to current node is updated
 get the response of tgeo

 Shoot one ray from start point with direction (dirx,diry,dirz). Fills input array
 with points just after boundary crossings.
   Int_t array_dimension = 3*dim;

 Check time of finding "Where am I" for n points.

--- Geometry overlap checker based on sampling.

 Estimate weight of top level volume with a precision SIGMA(W)/W
 better than PRECISION. Option can be "v" - verbose (default).

 count voxel timing

 Returns optimal voxelization type for volume vol.
   kFALSE - cartesian
   kTRUE  - cylindrical

 constructors