Switching User Interfaces

The VMC interface provides a common denominator for all implemented MC’s and cannot cover all commands available in a Geant4 user session through Geant4 user interface (UI). Switching between the Root UI and the Geant4 UI gives a user the possibility of working with the native Geant4 UI. It is also possible to process a foreign command or a foreign macro in both UIs:

From Root to Geant4 UI

Switching UI: 

root [0] ((TGeant4*)gMC)->StartGeantUI();

Call Geant4 macro myMacro.in from Root: 

root [0] ((TGeant4*)gMC)->ProcessGeantMacro("myMacro.in");

Call Geant4 command from Root: 

root [0] ((TGeant4*)gMC)->ProcessGeantCommand("/tracking/verbose 1");

From Geant4 to Root UI

Switching UI:

Idle> /mcControl/root

Call Root macro “myMacro.C” from Geant4:

Idle> /mcControl/rootMacro myMacro

Call Root command from Geant4:

Idle> /mcControl/rootCmd TBrowser b;

Geant4 VMC commands

Geant4 VMC implements several Geant4 UI commands associated with the objects defined in Geant4 VMC. To make their Geant4 VMC origin apparent, all these commands start with the prefix mc. Several Geant4 and Geant VMC commands are used in the g4config.in and g4vis.in macros in the VMC examples .

You can get an interactive help for all available commands by typing:

Idle> help

or

Idle> /control/help