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

Reply via email to