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Keywords: G4Box, boolean operation
Forum: Geometry
Re: None cubic Rassian dolls (Campagne JE)
Date: 22 Feb, 2007
From: John Apostolakis <John Apostolakis>

If you are placing several volumes one inside another, John Allison's suggested approach should be the easiest: create a box M1 of your material, inside it put a box A1 of air. Then next smaller box M2 of material, and inside it another box of A2 air. In this case A2 is in M2, that is in A1, which is in M1. This is the simplest and most used approach, and the navigator will treat this very efficiently.

Another approach can use a boolean solid to create just the box shell: Create a box solid BOut1 and a smaller one BIn1, and use the subtraction BOut1 - BIn1 to create a new solid BShell1. One thing to make sure is that if you create a smaller BShell2, you must not place it inside BShell1. This is less widely used, and can be slightly less efficient (the Navigator must ask all the box-shells when trying to locate a point and when navigating in the 'air' outside them.


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