Re: [Flightgear-devel] [BUG] /gear/gear[*]/{x, z}offset-in values depend on --log-level={info, debug}

[Tomash B. <tom...@gm...>]

2013/11/15 Anders Gidenstam <and...@gi...>

> Additionally, are you sure /position/lat,lon is for the CG and not for the
> origin of the main model coordinate system?
>

/position/lat,lon is bound to FDM in src/FDM/flight.cxx, I also checked
that they change when I shift CG (change load).  There's a small
discrepancy regarding geodetic vs. geocentric frames of reference, but I
think I get geocentric that I expect, and even if not ~1% error is OK for
friction.nas.  Anyway, it seems I had no choice, here's the snapshot for
the same position:

  /position/latitude-deg: 35.87961617
  /position/longitude-deg: 71.79618403
  /fdm/jsbsim/position/lat-gc-deg: 35.69710201 (hmm, what's that?)
  /fdm/jsbsim/position/lat-geod-deg: 35.87962143
  /fdm/jsbsim/position/long-gc-deg: 71.79618739

(there's no /fdm/jsbsim/position/long-geod-deg, and I'm not aware of any
other lat,lon properties).



> I'm fairly sure the primary position JSBSim reports to FG is the world
> position of the JSBSim Visual Reference Point (VRP)


What property do you refer to?



> Also, note that offsets in the main 3d-model XML file determine the
> coordinate system you use in that file - the root one I talk about above is
> before those offsets are applied.


Aha, we have -23 there, so 1 -> -22 suddenly makes sense, thanks for making
this clear!


-- 
  Tomash Brechko