Tanks for the answer. I have understood what i have to do. I think i will go with the Visitor Pattern since i do not really understand the how to use Functors (can't find tutorial). If u can point me to a good one (it would be great) I am still wondering if i can supose that every every vertices of every Geometry of my node are part of my loaded aircraft (May be i should ask this on the Flight Gear Mailing List)? If so how can i reduice the numbers of vertices obtained (i am only interested with the fuselage.
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