|Message: Field definition and its relation to geometry||Not Logged In (login)|
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Dear GEANT team, I have a following problem in understanding how the defenition of a magnetic (or any other) field is connected with real detector's geometry. Let's say I have to define a magnetic field from an existing field map. In my MyField class derived from G4MagneticField I create e.g. two arrays (one for axial and one for radial field) that define the particular field. After that I create in MyDetectorGeometry class that field as it's shown in the examples. But where do I define how the field read from field map relates to real geometry? If the reference point is (x=0,y=0,z=0) then how GEANT knows what elements of arrays defined by me in MyField class correspond to the (r,z)-point in real geometry? Or is there some convention of the defining filed maps?
I did not find any explanation in the Documentation and there is no simple example in the GEANT Examples,
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