[Gate-users] Using variance reduction techniques (splitting and Russian roulette) for selective (daughter) volumes?

[shahrokh nasseri]

Hi GATE users

How can restrict variance reduction techniques in the certain volume?
Or in other words, how can I use variance reduction techniques for
selective volumes (daughter volumes)?
In GATE manual, it is mentioned to use volume Filter (volumeFilter),
but this filter is not worked with processes module in physics. For
example, I want to use splitting in water phantom, how can I do?
In other hands, if I use the following command, splitting is
activated/occurred in the world volume and all children of world
volume, but I want to split events only in water phantom.
/gate/physics/processes/Bremsstrahlung/activateSplitting e- 1000

Thanks a lot for your comments.
Shahrokh