|Message: Re: Placing volumes across a material boundary||Not Logged In (login)|
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Another solution is to use a relatively new feature of Geant4 called Layered Mass Geometry.
In this method, taking your floating box example, you would place the water and air in the regular world, then place the floating box into a parallel world.
If you have Layered Mass Geometry enabled, and the floating box has a material assigned to it, then when particles are in the floating box, they will interact with its material, but when they are not in that box, they will interact with the material of the regular world.
For an example of Layered Mass Geometry, see examples/extended/runAndEvent/RE04
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