David Megginson writes: > Jim Wilson writes: > > > 2). On a fixed wing aircraft, if origin is anywhere but between the > > wings the external model views that follow along with the aircraft > > (e.g. chase view) will not look correct. The camera is tied to the > > origin. If the origin is at the nose or tail then the plane > > "looks" like it's wagging when it pitches. And if the origin is > > too high or too low again the model can "appear" to be swinging > > like a pendulum or sliding when it should simply be rolling. > > OK, finally I understand the problem. What we need to do, then, is > apply the euler angles to the CG rather than the origin when rotating > the 3D model. We need only two steps: > > 1. have the FDMs report the current CG relative to the origin (if they > don't already); and > > 2. add a couple of transforms to acmodel.cxx so that we use the CG as > the centre of rotation.
This is exactly why there was, and I think still is, a cg == center of geometry and a CG == Center of Gravity Both are needed and both are 'aptly' named Can we decide which one gets the UPPER CASE once and for all now ? Norman _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
