i think the best is http://www.smustard.com/script/FlightPath2 for only 7$
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RE: Flight path for LumenRt
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RE: ViaCad and Sketchup
take also a look at zwcad
http://www.zwcad.org/
found it some days ago, and had a quick look
pretty the same as acad (incl. looks) though a right price (ca 520 € incl vat)
regards