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Forum: Geometry
Re: None Dynamic Geometry whthin an event. (Kevin Xie)
Re: None Re: Dynamic Geometry whthin an event.
Date: 18 Sep, 2009
From: John Apostolakis <John Apostolakis>

It is foreseen and permitted to make changes in the geometry ONLY  
between runs.  It is a matter of correctness of simulation, efficiency  
and the areas of application of Geant4.

Correct simulation cannot be guaranteed if the geometry to change  
during a run.  ( And since any number of events can compose a run, you  
can create a run with one event and change the geometry every event.)

Efficiency (performance) considerations: Simple changes can have an  
overhead that is small compared to the simulation time for a few  
events.  But changes at other intervals will be too costly.

Application domain(s): We are not aware of a use case in the usual  
application domains of Geant4 (primarily High Energy Physics, Nuclear  
Physics experiments, Medical Physics, and Space Science) in which the  
geometry should change as the particles produced by one or few primary  
particles propagate through it.

As a result we do not support the changing of the geometry within an  

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