Hi All,
--- Hans Fugal wrote:
> 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.
I'm very sorry you are seeing problems related to my patch. Thanks very
much to all who have reported it.
I'd be very grateful if you could help me diagnose the problem, as I did
quite a lot of testing, but didn't encounter this myself.
One possibility is that my interpolation is "fighting" with something else
trying to write to the weather properties.
Could you explain what you are seeing in terms of wind direction and
strength? Is it:
- oscillating in direction and/or speed
- rotating continually?
- chaotic?
Are you seeing the problem generally, or only when the METAR changes as
you fly from one zone to another?
If it is easily reproducable, could you run with the following
command-line parameters and post the results, either to the list or
directly to me:
--trace-write=/environment/metar/real-metar
--trace-write=/environment/metar/base-wind-range-from
--trace-write=/environment/metar/base-wind-range-to
--trace-write=/environment/metar/base-wind-speed-kt
--trace-write=/environment/metar/gust-wind-speed-kt
--trace-write=/environment/config/boundary/entry/wind-speed-kt
--trace-write=/environment/config/boundary/entry/wind-from-heading-deg
If you could also describe the specific flight that repros the problem
that would be most helpful.
> 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.
This behaviour was present before my patch went in. Whenever a new METAR
is read, the cloud config is reset. So, even though previously you could
change the current cloud config, your changes would be lost when the next
METAR was read - 15 minutes if the same station, within a minute if you
moved to a new station.
My patch effectively reduces these periods to 0.
To set the clouds manually, I think you'd need to set the scenario to
"none", but see below.
It might be a good idea to modify the dialog slightly to disable the
configuration if METAR is active, along with a short explanatory message.
> 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).
That's the theory. However, as I recall, the GUI doesn't select the
correct scenario initially, so you may be running on METAR, open the
dialog and fine "none" selected. However, if you click "Apply", it should
change the scenario to "none" properly.
Once again, my apologies if this has spoilt anyone's flights. If this is
causing people problems, it should probably be backed out. However, I
would like to get to the bottom of the issue, as a (working) patch to
interpolate METAR is something that we need.
-Stuart
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