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\page ExampleuserPrimaryGenerator Example userPrimaryGenerator
The example shows how to create a primary event including several vertices and
several primary particles per vertex
## Geometry construction
It is a simple box which represents an 'infinite' homogeneous medium.
## Physics list
PhysicsList defines only geantino and transportation process.
## Primary generator : several vertices and particles per event
- vertex A and particle 1 : a geantino uniformly randomized on a cylinder surface.
- vertex B and particles 2 and 3 : symetric to vertex A.
## Visualisation
Visualization Manager is set in the main().
Initialisation of the drawing is done via the commands
`/vis/..`` in the macro vis.mac. This macro is automatically read from the main
in case of interactive running mode.
## How to start ?
- execute userPrimaryGenerator in 'batch' mode from macro files
```
% ./userPrimaryGenerator run1.mac
```
- execute userPrimaryGenerator in 'interactive mode' with visualization
```
% ./userPrimaryGenerator
....
Idle> ---> type your commands. For instance:
Idle> /run/beamOn 1
....
Idle> exit
```