class TGeoChecker: public TObject

   Geometry checking package.

 TGeoChecker class provides several geometry checking methods. There are two
 types of tests that can be performed. One is based on random sampling or
 ray-tracing and provides a visual check on how navigation methods work for
 a given geometry. The second actually checks the validity of the geometry
 definition in terms of overlapping/extruding objects. Both types of checks
can be done for a given branch (starting with a given volume) as well as for
 the geometry as a whole.

 1. TGeoChecker::CheckPoint(Double_t x, Double_t y, Double_t z)

 This method can be called direcly from the TGeoManager class and print a
 report on how a given point is classified by the modeller: which is the
full path to the deepest node containing it, and the (under)estimation
 of the distance to the closest boundary (safety).

 2. TGeoChecker::RandomPoints(Int_t npoints)

 Can be called from TGeoVolume class. It first draws the volume and its
 content with the current visualization settings. Then randomly samples points
in its bounding box, plotting in the geometry display only the points
classified as belonging to visible volumes.

 3. TGeoChecker::RandomRays(Int_t nrays, Double_t startx, starty, startz)

 Can be called and acts in the same way as the previous, but instead of points,
 rays having random isotropic directions are generated from the given point.
 A raytracing algorithm propagates all rays untill they exit geometry, plotting
 all segments crossing visible nodes in the same color as these.

 4. TGeoChecker::Test(Int_t npoints)

 Implementation of TGeoManager::Test(). Computes the time for the modeller
 to find out "Where am I?" for a given number of random points.

 5. TGeoChecker::LegoPlot(ntheta, themin, themax, nphi, phimin, phimax,...)
 
Implementation of TGeoVolume::LegoPlot(). Draws a spherical radiation length
 lego plot for a given volume, in a given theta/phi range.

 6. TGeoChecker::Weigth(Double_t precision)

Implementation of TGeoVolume::Weigth(). Estimates the total weigth of a given
 volume by matrial sampling. Accepts as input the desired precision.

 Overlap checker


  -> add it from the doc.

<img src="gif/t_checker.jpg">

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