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In the overveiw it says that there are tools for analysing a structure. How is this Done?
There are a variety of tools and analytic packages (many) that link with or directly use BRL-CAD. BRL-CAD itself, however, does not generally perform any non-geometric analyses. Most of those codes hook into BRL-CAD's raytace and numerics libraries for geometry introspection where thicknesses, material types, overlaps, structure, and other information may be then used by the analytic code. BRL-CAD's librt interface is rather simple enough to use in that regard. There's a simple example available on the website presently at http://brlcad.org/example_app.php