I have been lurking on this list for a while but now I have something to
Fly just about any JSBsim or Yasim model (not UFO or UINC) get the plane
level, straight and stable with or without the AP.
AFAI can tell it happens on all JSB and YASIM models that you can get
Now press the z/Z to adjust the visibility a few times and the whole plane will get a shake up just as if the stick was waggled.
This happens because the FGEnvironment class has to be reinitialized every time you change visibility. These sudden changes don't fade-in the newly fetched values, but drop the in at once. Esp. for the wind (and turbulence) this can cause the waggle effect.
For FlightGear changing visibility is not just an OpenGL state change, but lots of other stuff has to adopt to that (including sky/cloud coloring, etc).
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