virtual void Draw(Option_t *option="")
draw top volume according to option
TGeoVolume * GetVolume(const char *name) const
Search for a named volume. All trailing blanks stripped.
Using a TBrowser one can browse all ROOT objects.
R__EXTERN TGeoManager * gGeoManager
static TGeoManager * Import(const char *filename, const char *name="", Option_t *option="")
static function Import a geometry from a gdml or ROOT file