Tony Peden writes: > > The point we pick need not have any particular signifigance (we can > calculate a lat/lon/alt for anyplace relative to the aircraft), so why > should we pick a point which requires explanation and/or instruction on > our part and more work on the part of the 3D modeler. > > The nose is something that everyone can instantly understand and locate. > That is not true for the aero ref point, center of gravity, center of geometry, etc.
xorig = fuselage length / 2 yorig = wingspan / 2 zorig = highest point / 2 < usually top of tail > obvious enough for me :-) Main Entry: 1cen·ter Pronunciation: 'sen-t&r, 'se-n&r Function: noun Etymology: Middle English centre, from Middle French, from Latin centrum, from Greek kentron sharp point, center of a circle, from kentein to prick; probably akin to Old High German hantag pointed Date: 14th century 1 a : the point around which a circle or sphere is described; broadly : a point that is related to a geometrical figure in such a way that for any point on the figure there is another point on the figure such that a straight line joining the two points is bisected by the original point -- called also center of symmetry b : the center of the circle inscribed in a regular polygon Norman
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