|Message: Re: different navigation routine||Not Logged In (login)|
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It is possible to substitute the Geant4 'Navigator' class with one of your own, derived from G4Navigator.
You can see which methods of G4Navigator are virtual, and would need to be replaced by you own method. They include methods to locate a point in your geometry, find the next boundary, and several auxiliary methods.
You also need to provide solids, logical volumes and physical volumes which 'mirror' the ones which you created for your geometry - and correspond one-by-one to the volumes you use. Because of this, I would not expect the effort required to be small.