I did some more investigating, and discovered that it is still
happening even "fair weather", it's just that the wind speed is low
enough that the effect isn't very pronounced. Also, taxi up to a
windsock and watch the effect.

Incidentally, I was trying to add a layer of clouds with
--enable-real-weather-fetch. No matter what weather scenario I had
chosen, adding clouds fails to have any effect (and when opening the
clouds dialog again, everything is reset to -9999). I don't know if
this is related, but it doesn't seem very desirable to have the
weather dialogs do nothing useful when real-weather-fetch is enabled.

Semantically, am I right that for weather scenarios, METAR is the real
weather, Thunderstorm is thunderstorm-like weather (no relation to
real weather?), fair is easy flying (again, no relation to real
weather?), and none means no scenario (manual control?). That's what I
think they should mean but I'm not convinced that that is what they
mean (or anything else that would make sense).

On 8/7/07, Georg Vollnhals <[EMAIL PROTECTED]> wrote:
> Laurence Vanek schrieb:
> > Hans Fugal wrote:
> >
> >> Flying in the vicinity of KCSQ just now (KCSQ 062055Z AUTO 16006KT
> >> 10SM CLR 26/23 A2979 RMK AO2) in both the pa28-161 and j3cub, I
> >> noticed some kind of weather-related problems. I'm afraid it was
> >> probably weather interpolation-related.
> >>
> >> My plane was being tossed around like a salad, but as you can see from
> >> that METAR there's no mention of severe turbulence. It went away when
> >> I chose "fair weather" scenario. Turning the turbulence down to 0 on
> >> the layer I was flying in changed nothing.  It wasn't an FPS or
> >> machine load problem, which was my first suspect. It didn't feel like
> >> real turbulence, but it did feel like fighting walls of weather, as if
> >> they were alternating from one to another.
> >>
> >> FG/OSG (osgviewer) built from CVS from last night (roughly 0800 UTC),
> >> which I believe to be current. Happy to compile and try any variant
> >> (plib, osg/glut) on request.
> >>
> >>
> >>
> > I can confirm this also. However, I took it as a taste of realism
> > (feature not a bug?). I also had the turb set to zero. As Hans states it
> > seems to conflict with what the METAR is saying.
> >
> >
> >
> >
> >
> This behaviour occured first here after I compiled OSG CVS with the new
> weather interpolating patch.
> AND I have to fetch real weather "--enable-real-weather-fetch", what is
> default for me.
> NOT using this parameter brings a normal situation back (= smooth flight).
>
> This evening I made several testflights from the same airport WITH and
> WITHOUT "real-weather-fetch" and it is obvious to me that this bug is
> related to the latest change (weather interpolating feature).
> And just adding, when you have this "artificial turbulence" you can
> watch your ASI jump between the indicated speeds and when flying pretty
> low and looking at the electrical windmills you watch them changing
> their direction very fast.
>
> Regards
> Georg EDDW
>
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-- 
Hans Fugal
Fugal Computing

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