|Message: Re: Dynamic Geometry whthin an event.||Not Logged In (login)|
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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 event.
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