Russell Suter writes: > > Norman Vine wrote: > > > >Simply stated the problem is that inorder to rotate an object about an arbritrary > >point you *must* do the equivalaent of the following > > > >1) translate object so that it's 'rotation point' is at the 'point of rotation' > >2) rotate the object > >3) translate the object to it's 'desired' position > > this may not be it's original position depending on > > a) the 'coordinate frame' the object is described in > > which very likely is the case with an arbritrary VRP > > b) if the coordinate frame is dynamically changing > > as is the case with aerodynamic forces and gravity > > determining the 'frame' in a sophisticated FDM > > > > > The first item doesn't need to be done per-frame. It can be done once and > "remembered".
Agreed, and this is AFAICT what is done know although I don't believe the dynamic adjustment to the CG is accounted for yet FWIW AFAICT what isn't done is (3) Cheers Norman _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel