Re: [Flightgear-devel] Wind confusion.
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Sat, Feb 16, 2002 at 04:06:13PM -0800, Alex Perry wrote: [..bait snipped..] Purely on principle, I think it is more important to let each FDM subsystem use whatever conventions that its authors believe will make for a consistent and easy to maintain codebase. We want them to work! Any sign (or axis) mismatches can be dealt with in the interface class. FWIW, that's what I was trying to say: Internal (and external) interfaces should be standardized. That's what interfaces are for, right? - -- Regards, I RADIS, do you? =Martin=http://www.iradis.org/ PGP: FE87448B DDF8 677C 9244 D119 4FE0 AE3A 37CF 3458 FE87 448B From: Martin van Beilen [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: [Flightgear-devel] Wind confusion. In-Reply-To: [EMAIL PROTECTED]; from [EMAIL PROTECTED] on Sat, Feb 16, 2002 at 04:06:13PM -0800 X-S-Issue: [EMAIL PROTECTED] 2002/02/17 10:09:58 aaccadb4366757ec7f3788cb9f66b74b -BEGIN PGP SIGNATURE- Version: GnuPG v1.0.6 (GNU/Linux) iEYEARECAAYFAjxvc20ACgkQN880WP6HRIsKQwCgo2PGlVYpezy8v7PSKSecnyS+ rt8AnRG2HTIM444HPuw96cf+BFCgxdMt =krCX -END PGP SIGNATURE- ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] compiled binaries for 0.7.9
Right now on the FlightGear downloads page we have ready to run binaries for Windows, Mac OS X, Debian, and Sgi. I'm just trying to find out how to get some official blessing for a SuSE package that I plan to build, Martin. -- Unix _IS_ user friendly - it's just selective about who its friends are ! -- ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] compiled binaries for 0.7.9
dyld: ./fgfs-0.7.9-02.16.02 can't open library: /usr/X11R6/lib/libXmu.6.dylib (No such file or directory, errno = 2) Since I am missing the entire X11R6 directory, I assume that I need to load Xfree86? Yes, from a UNIX point of view you do, Martin. -- Unix _IS_ user friendly - it's just selective about who its friends are ! -- ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Wind confusion.
Tony Peden [EMAIL PROTECTED] said: I'd be happier if we kept it as is. Wouldn't be the first time engineers have traded correctness for pragmatism. Ah pragmatism! Is that the excuse engineers use when they get their vectors math bass-ackwards? ;-) Best, Jim ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] More DC-3 3D model progress
I'm starting to add basic markings to the DC-3 3D model, and actually managed to get the stripes to line up around the nose (it's in the base package): http://www.megginson.com/flightsim/dc3-markings.png Unfortunately, vertex-smoothing doesn't seem to be surviving AC3D export, but I'll look into that. All the best, David -- David Megginson [EMAIL PROTECTED] ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Wind confusion.
On Sun, Feb 17, 2002 at 04:00:03PM -, Jim Wilson wrote: Tony Peden [EMAIL PROTECTED] said: I'd be happier if we kept it as is. Wouldn't be the first time engineers have traded correctness for pragmatism. Ah pragmatism! Is that the excuse engineers use when they get their vectors math bass-ackwards? ;-) Bah humbug. Engineers, seeing that there were two incompatable standards simply choose to break the one normally seen by people who should be able to understand the problem and adapt. Obviously, in this case, they chose the wrong group. :) -- James (Jay) Treacy [EMAIL PROTECTED] ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Wind confusion.
Bah humbug. Engineers, seeing that there were two incompatable standards simply choose to break the one normally seen by people who should be able to understand the problem and adapt. Obviously, in this case, they chose the wrong group. :) Ha! Someone made the suggestion that we are doing this bass-ackwards. I disagree. We are talking about simulating an aircraft, about an aircraft-centric phenomena, and about a phenomena that is normally reported by humans in a particular way. Sitting on the runway, pointed with a heading of 20 degrees, and with a wind of 20 knots from 20 degrees (as is normally reported, that is, the *from* direction is given), the aircraft sees 20 knots headwind. This equation in FGTranslation shows this nicely: vAeroUVW = vUVW + State-GetTl2b()*Atmosphere-GetWindNED(); I know that the wind vector that originates in the NED axis points *at* 200 degrees and that the north component of this vector would be a negative number. But, what happens if you add the aircraft velocity and the wind velocity vectorially? You sure don't get the aircraft total sensed velocity vector. This approach we have taken is a compromise between what is easily understandable by most people when it comes to wind speed and what makes sense in a mathematical sense (see the above equation). Of course you can do it a couple of ways. It just needs to be documented. We have fallen short there, apparently. Jon ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Re: Aileron trim aid.
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Sun, Feb 17, 2002 at 04:10:15PM +0100, Melchior FRANZ wrote: * It is not possible to have more then 1 active telnet connection at a time. Yes, and it's a feature. ;-) Hmmm.. Must be an rfc3092 compliant feature. so perl has still only 14% of the size of the fgfs binary Right. Assuming, of course, that both programs run on the same machine. And even then, I'm just one of those weird people who for some strange reason think that small is beautiful. :-) Additionally, my script runs on a standard Tom's root boot. http://www.toms.net/rb/ I rest my case. Tell us, when you got fgfs running from a floppy disk ... :- Easy. It's just a matter of having enough disks and RAM. - -- Regards, I RADIS, do you? =Martin=http://www.iradis.org/ PGP: FE87448B DDF8 677C 9244 D119 4FE0 AE3A 37CF 3458 FE87 448B From: Martin van Beilen [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: [Flightgear-devel] Re: Aileron trim aid. In-Reply-To: [EMAIL PROTECTED]; from [EMAIL PROTECTED] on Sun, Feb 17, 2002 at 04:10:15PM +0100 X-S-Issue: [EMAIL PROTECTED] 2002/02/18 02:07:27 949b77a4ee2b32b33d133bca9dd8ca7d -BEGIN PGP SIGNATURE- Version: GnuPG v1.0.6 (GNU/Linux) iEYEARECAAYFAjxwU9YACgkQN880WP6HRIt5cQCglGuAz5b5Gi1b2eRSCRdAq9WT ckYAmwYzPy7gdve7NDUjto4vpqAqr3DM =rlmR -END PGP SIGNATURE- ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Seg fault on 2nd reset
I'm getting a set fault after resetting twice with either LaRCsim or JSBSim. In both cases it's getting through the FDM init, updates the material textures, updates sun and moon positions, and then quits after printing: Logging priority is info Set logging classes to terrain|astro|flight|input|gl|view|cockpit|general|math|event|aircraft|autop ilot|io|clipper|network Here, FG quits after the 2nd reset and when I just start and reset. []'s Marcio Shimoda ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Seg fault on 2nd reset
On Sun, 2002-02-17 at 17:37, Marcio Shimoda wrote: I'm getting a set fault after resetting twice with either LaRCsim or JSBSim. In both cases it's getting through the FDM init, updates the material textures, updates sun and moon positions, and then quits after printing: Logging priority is info Set logging classes to terrain|astro|flight|input|gl|view|cockpit|general|math|event|aircraft|autop ilot|io|clipper|network Here, FG quits after the 2nd reset and when I just start and reset. []'s This should be fixed in the current CVS. Marcio Shimoda ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel -- Tony Peden [EMAIL PROTECTED] We all know Linux is great ... it does infinite loops in 5 seconds. -- attributed to Linus Torvalds ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Aileron trim aid.
Martin van Beilen wrote:
Andy Ross wrote:
But... sh and awk?
Goodness gracious, learn some perl, man! :)
I'm fluent in Perl, thank you very much. However:
ls -l /usr/bin/{awk,nc,perl}
- -rwxr-xr-x 2 root root88236 Jun 19 1999 /usr/bin/awk*
- -rwxr-xr-x 1 root root15480 Jun 19 1999 /usr/bin/nc*
- -rwx--x--x 1 root root 790241 Jan 1 2001 /usr/bin/perl*
Point conceded. Perl is huge. Almost a whole megabyte, even.
You're aware that the _same_ argument was raises repeatedly about the
piggish awk language, back in the day? I mean, just look at it: 88k
of text segment is more than original unix tools had in their whole
address space! Yikes. :)
I'm just teasing. Nothing wrong with writing what you want the way
you want it; that's the whole point of hacking. But still...
Andy
--
Andrew J. RossNextBus Information Systems
Senior Software Engineer Emeryville, CA
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Men go crazy in conflagrations. They only get better one by one.
- Sting (misquoted)
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Re: [Flightgear-devel] Wind confusion.
Martin van Beilen wrote:
I think I am beginning to understand what the source of the
confusion is. As most of you know, weather reports specify the winds
as a _from_ heading. However, in simulated space I tend to think of
wind as a vector, i.e. a _to_ heading. Apparently, two out of three
FDM's agree with my point of view. So what is the consensus on this
one? To or from?
Tony Peden wrote:
From is the accepted convention in aviation, hopefully that's what
JSBSim treats as positive. I'll attempt to verify later.
I took my hint from the naming of the accessor functions:
FGInterface::get_V_{north|east|down}_airmass();
These imply pretty strongly that they return the velocity of the
airmass, in the (horrifically ugly but well-understood) local
coordinate system. That is a to vector, by definition. Really, the
from convention applies to a 1-dimensional compass direction; I'm
not aware of anyone else trying to apply it to a 3D vector
environment.
That being said, I'd be happy to negate my wind vector if that's what
folks decide.
I also found an interesting glitch with YASim: the airspeed
indicator displays the ground speed. I thought I was going to stall,
but didn't. :)
Yup, so it does. That's a problem. I'm setting the output stuff in
FGInterface wrong, somehow. Ah, found it: in YASim.cxx, you'll note
that I call set_V_rel_wind(); try to find out where the wind gets
added in. Oops.
I need to remember where I keep the wind and what conventions are used
to fix this, but need more urgently to go to bed. I'll have this
fixed tomorrow.
Andy
--
Andrew J. RossNextBus Information Systems
Senior Software Engineer Emeryville, CA
[EMAIL PROTECTED] http://www.nextbus.com
Men go crazy in conflagrations. They only get better one by one.
- Sting (misquoted)
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[Flightgear-devel] FlightGear Priorities
Hi! Curtis could you please tell us your priotities to next FlightGear release and It would be 0.7.10 or 0.8.0? As for me I'd like to see 1)ground explosion when plane crash the ground (I have a lot explosion textures) 2)runway lights support 3)aircraft landing lights 4)trees houses and various objects (Have objects and textures) 5) terrain with LODs 6) realisitc clouds I understand that it can be diffuluct to implement. Thanx Bye ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
