examples/extended/visualization/userVisAction

This example illustrates how to create a "vis action".

The idea is that you register a vis action with the vis manager and activate it by a command /vis/scene/add/userAction. In this case, it draws a simple logo.

1) UVA_VisAction.cc defines a G4VUserVisAction and implements a Draw method.

2) In the main () program (see userVisAction.cc), UVA_VisAction is instantiated and its pointer registerd with the visualization manager. You may optionally specify an extent at this point to assist the viewers to locate the objects.

3) To visualise, use the usual Geant4 vis commands to create a view and scene, then add the vis action to the scene with

/vis/scene/add/userAction

see vis.mac.

Note: The system needs an "extent" in order to point the virtual camera and adjust its field of view, etc. This defines the "standard view". You may zoom, etc., from this standard view. The extent may be specified as suggested above or by using /vis/scene/add/extent.

John Allison 27th November 2014