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Question Is there a way to exclude units from "G4BestUnit" selection? 

Forum: Geometry
Date: 05 Feb, 2018
From: Michael H. Kelsey <Michael H. Kelsey>

We have an experimental design which includes some components engineered in Imperial units. To avoid back-and-forth conversions of dimensions, I registered a small number of new Imperial unit definitions ("inch", "foot", "mil") in my G4 application, along with the corresponding scale constants. This allows us to set dimensions directly from the engineering drawings, without having to convert.

Unfortunately, this has had an unfortunate side effect. Some of the diagnostic messages printed by G4 (and by our own application) make use of G4BestUnit for output. With the new unit definitions, we sometimes get geometry warnings like

          Overlap with mother volume !
          Overlap is detected for volume Fe55SourceFoil
          with its mother volume Fe55SourceCapsule
          at mother local point (-1.46749,0.478579,1.4745), overlapping by at least: 1.00394 mil

Is there any way to "exclude" a G4UnitDefinition object from being used by G4BestUnit? Or should I drop the creation of G4UnitDefinitions here (which means they aren't available to macro commands) and just have the static const's for use in code?

     -- Michael Kelsey

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