|Message: Local to Global... again||Not Logged In (login)|
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Hello, I've been reading threads 616 and 287. I confess that I am a Geant newbie.
My specific application: I am creating a geometry (using the VGM package) and I wish to attach local magnetic fields to specific volumes (magnets). The Field classes allow only global coordinates, so I need to actually go from local to global coordinates. (I also want to find the global vector corresponding to the local Z-axis.)
After constructing the detector, I have a pointer to the volume that I want to navigate from.
Gabriele's earlier posts, in 287, suggested that one uses a 'custom G4Navigtor' to 'scan for a global point in the local volume'. How does one do that?
I'm constructing a beam line geometry with some fairly small magnets inside a large world volume.. surely I don't have to do a trial-and-error search of every global grid point just to find where one of my magnets... do I?
Thanks for any help with this,
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