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