Hi there,
I can confirm that I've seen the same thing, when using an unmodified
(out-of-box) copy of apt.dat with some custom scenery I built. I've had to
amend apt.dat with the airport data generated by the custom scenery build
process. Otherwise my startup locations are incorrect, and offset by as much as
15-20 metres.
I wonder if it is as simple a problem as the standard apt.dat being built using
less accurate data than that we build custom scenery from?
For people downloading custom scenery it would be beneficial if somehow during
the process of extracting the new scenery, that the modified airport layout
data were reflected in apt.dat. Not sure how that would be accomplished, but
doing that would cure the offset startup locations problem.
Kind regards,
Chris Wilkinson, YBBN/BNE
________________________________
From: Anders Gidenstam <anders-...@gidenstam.org>
To: flightgear-devel@lists.sourceforge.net
Sent: Wed, 28 October, 2009 8:56:56 AM
Subject: [Flightgear-devel] Custom scenery data startup location problem.
Hi,
I wonder if anyone alse has noticd that the startup location on runways
with a displaced threshold differs depending on whether the custom scenery
<ICAO>.threshold.xml file or apt.dat is used?
Here is runway 9 at EDDR with the options --airport=EDDR --runway=09:
http://www.gidenstam.org/FlightGear/misc/tmp/startup_location_problem.jpg
To the left /sim/paths/use-custom-scenery-data is false
and to the right /sim/paths/use-custom-scenery-data is true.
I have seen this on other airports too.
Since the code that positions the aircraft on the runway is the same in
both cases it appears that the data loaded into the internal DB differs
depending on the source. I don't know if it is the data in the .thres.xml
file that is bad or if it is a bug in the loader. (I guess it can be
either depending on how one defines the meaning intended interpretation of
the XML data :)
Cheers,
Anders
--
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Anders Gidenstam
WWW: http://www.gidenstam.org/FlightGear/
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