--- Norman Vine <[EMAIL PROTECTED]> wrote: > 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
The equations and associated verbiage prove the point well, I think. > > > > ATTACHMENT part 2 image/gif name=audio.gif __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
