Hello, Switching to v 6.24 from 6.22 I’ve found that TGeoManager related classes/functions assume [mm] as units of coordinates/length. In versions <= 6.22 it was [cm]. TGeoManager::GetDefaultUnits() returns “0” (kG4Units) for both ROOT versions. What was a reason to change default and how to kn…

TGeoManager units

graphics

Wile_E_Coyote May 15, 2021, 6:29pm 4

Unit inconsistency with TGeoManager and GDML/TGeo geometries ROOT

I’m (supposedly) facing an inconsistency in TGeoManager regarding the length units. I have a Geant4 geometry, from which I produce: a GDML file using G4GDMLParser a GDML file using VGM a Root file containing the TGeo geometry using VGM All these three persistent formats describe the very same geometry, but when I read them back with TGeoManager and check the volume positions I get values expressed in: mm mm cm respectively for the three formats. In this simple reproducer (10.0 KB) there …

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