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Fr/Foire aux questions

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Consultez également : Aircraft, Multiplayer Help, Installing Scenery, and Flying the Helicopter.

Cette FAQ n'a pas été mise à jour de manière significative depuis 2006.

Vous êtes donc invité à faire des ajouts, des changement ou des corrections.

Contents

La FAQ

Où puis-je obtenir la dernière version de cette FAQ?

http://www.flightgear.org/Docs/FlightGear-FAQ.html

Qui puis-je contacter si j'ai des commentaires sur cette FAQ ?

Ajoutez vos commentaires à la page de discussion de cette FAQ Talk:FAQ.

De quand date ce document ?

Cliquez sur l'onglet "historique" en haut de cette page.

Quelle autre documentation importante devrais-je lire ?

Distribution

Où puis-je télécharger FlightGear?

La page officielle de téléchargement est http://www.flightgear.org/Downloads/. Notre principale méthode de distribution est le code source, mais des binaires précompilés sont disponibles pour Windows et SGI IRIX.

FlightGear également disponible sous forme de paquets pour Linux par SuSE, Debian (sid) et Mandrake (Cooker) et peut être ainsi directement installé pour ces distributions.

Comment installer FlightGear Sur Ubuntu ?

FlightGear peut être installé directement à partir du gestionnaire de paquets Synaptic. Ouvrez le gestionnaire de paquets Synaptic (Système -> Administration -> Gestionnaire de paquets Synaptic, cherchez FlightGear et suivez les instructions. Pour Ubuntu 7.10 vous pourrez installer FlightGear 9.10.

What if I want to install Flight Gear 1.0 or later versions on Ubuntu?

First install WINE from Synaptic, then run the FGSetup installer by right clicking and selecting open in WINE. Just follow instructions. Everything seems to work OK and is quite fast except for the first startup screen where the aircraft list is not visible. For information on WINE see http://www.winehq.org/

Quel est le mot de passe pour le serveur FTP ?

Le serveur FTP utilise une procédure d'identification anonyme standard. Identifiez-vous avec l'identifiant "anonymous" et utilisez votre adresse de courriel comme mot de passe. La plupart des clients FTP et des navigateurs web le feront automatiquement pour vous.

Why won't the FTP server let me in with the right login info?

This generally means that the server is at it's capacity. You should receive a message saying such, but your FTP client may be hiding it from you. Your options are to keep trying until a slot opens up or try connecting to one of our FTP mirrors listed at http://flightgear.org/mirrors.html.

Où puis-je trouver le dernier code source de développement ?

The latest development code is available for everyone through our CVS repository. See http://www.flightgear.org/cvsResources/ for details.

Otherwise, you can get relatively up-to-date snapshots of the development tree at ftp://flightgear.sourceforge.net/pub/flightgear/Devel/Snapshots/.

Qu'est-ce que SimGear et pourquoi en ai-je besoin ?

SimGear is a library of supporting code. SimGear is only needed if you plan on compiling FlightGear -- it is not needed to run precompiled binaries. For more information see http://www.simgear.org/. Note: When compiling FlightGear it is very important to have the matching version of SimGear.

Où puis-je voler et où télécharger les scènes ?

Afin d'éviter un téléchargement trop lours, le paquetage de base ne contient que la zone de la baie de San Francisco. Cependant, vous pouvez voler n'importe où dans le monde. Rendez-vous à la section "Additional Scenery" de la page http://www.flightgear.org/Downloads/ pour plus d'informations ou rendez-vous directement à l'interface graphique de téléchargement à l'adresse http://www.flightgear.org/Downloads/world-scenery.html.

Visitez également la section "Places to Fly" sur le site http://www.flightgear.org/Places/ pour de l'aide complémentaire à la navigation vers endroits exceptionnels. (voir également Installing Scenery)

Where can I get different 3D models for my plane?

Official FlightGear aircraft can be found at http://www.flightgear.org/Downloads/aircraft/ . Other aircraft in development can be found on CVS, and some other aircraft can be found on 3rd party [FlightGear hangars]].

How current is the data in FlightGear compared to the real world?

We use the same navaid and airport dataset that X-Plane uses. The current dataset can be found in the $FGROOT/Navaids/ and $FGROOT/Airports/ directories. If you have updates or corrections to the dataset, see http://www.flightgear.org/Docs/AirNav/AptNavFAQ.FlightGear.html for instructions on contacting the database maintainer.

Where is the moving map?

A popular moving map display is available under a separate project called Atlas (See http://atlas.sf.net/) Also, MPmap is an online map for multiplayer.

Why don't you charge money for this?

FlightGear can be downloaded for free from many locations including the FlightGear website, but can also be bought on a CD. Although we offer that service (see the website), we encourage other groups to redistribute it for their users, especially within an operating system distribution which makes installation even faster and easier for new users.

Occasionally you may see FlightGear for sale on auction sites or commercial websites under some other name. This can be done quite legitimately as long as the terms of the license are upheld and might be worth the cost if some value-added features such as additional scenery, aircraft or after-sale support are included. Unfortunately, most cases seen to date appear to be just someone trying to make money selling something that is free and providing no real added value.

How can I get started with FlightGear

FlightGear version 1.0 can be downloaded at Download Central, but most aircraft need to be separately downloaded Here and installed manually (see also FlightGear 1.0 default aircraft). Be aware of system requirements! Also, check out New to FlightGear.

Compiler

1rightarrow.png See Building Flightgear for the main article about this subject.

Pourquoi est-ce que FlightGear ne compile pas ?

Well, that depends. First make sure you are using the appropriate versions of FlightGear, SimGear, plib, zlib. If any of the packages are out of sync with the others, compilation may fail. See also Building FlightGear

The FlightGear Downloads page (http://www.flightgear.org/Downloads/) should tell you what versions you need if you are trying to compile the latest stable release. If you are using a development snapshot, make sure all three packages are up-to-date.

Also ensure that you have some implementation of OpenGL with glut support with the appropriate header files. Linux users with nVidia cards should make sure you have the latest drivers from nVidia. Other Linux users make sure you have Mesa3D (http://mesa3d.org/) and your X server installed correctly.

If your problems persist, subscribe to our FlightGear-Users mailing list and let us know what problem you're having. See http://www.flightgear.org/mail.html for help with this.

J'utilise RedHat 7 et... ?

Update your gcc packages. See http://redhat.com/errata/ to fix it and http://www.gnu.org/software/gcc/gcc-2.96.html for an explanation why.

Configurer

How do I install new scenery?

The scenery archive files (ie. w100n30.tar.gz) should be untarred into the Scenery/Terrain directory in your $FG_ROOT.

Comment configurer mon joystick ?

FlightGear should come with a helpful program called `fgjs` that can help configure your joystick. Run `fgjs` and then copy the dot file it created into your home directory or add its contents to your existing rc file.

Also, see the README.Joystick file located in the FlightGear/docs-mini/ directory of the source distribution and the Joystick-page on the wiki.

What format should my personal .fgfsrc file be in?

Your .fgfsrc file should simply be a list of command line options with one option per line. The file is not an XML file.

If you would rather use an XML configuration file, you can add something like the following in your .fgfsrc

--config=/path/to/my/config.xml

Almost every option corresponds to a property, so you can choose to use whichever method best suits your needs.

Running

Why do I get an error loading libopenal.so.0?

With the default installation, libopenal.so.0 is installed into /usr/local/lib. You need to ensure that that path is listed in /etc/ld.so.conf, then run `ldconfig`as root.

Why do I get "ssgInit called without a valid OpenGL context"?

In short, your GL libraries are broken. So far only Red Hat 7.x users have experienced this (see http://www.redhat.com/bugzilla/show_bug.cgi?id=18867). The only solutions are possibly complicated ones: you can either change distributions (most of us prefer Debian) or upgrade/downgrade your Mesa libs.

Why do some other GL applications work though? Well, Steve Baker (Mr. PLIB) has explained this on the plib-users list (http://www.geocrawler.com/lists/3/SourceForge/1867/0/6470648/).

What happened to the panel, keyboard, etc?

The problem is almost certainly that your base package is out of sync with FlightGear. Many configurable parts of FlightGear are defined in XML files contained in the base package.

Why doesn't audio work properly under Irix?

FlightGear (as of June 2001) uses the Portable Libraries (PLIB) for playing audio. The audio queue implementation of PLIB is far from optimal (in fact it's just wrong). This seems to work on other platforms quite well, but Irix expects things to be programmed properly.

There has been discussion about using OpenAL (http://www.openal.org/) for the next release of both PLIB and FlightGear. Tests show that the OpenAL audio implementation does the job right, meaning that these audio problems should be gone by then. In the mean time it is best to disable audio on Irix completely (by adding --disable-sound either on the command line or to your $HOME/.fgfsrc file).

Why is FlightGear so slow?

FlightGear supports hardware acceleration, but it seems not to be activated. Make sure you have OpenGL libraries installed and configured properly and make sure you have the latest drivers for your video card.

Linux users: If you are an nVidia user, follow their directions on getting your card working. For most other users, make sure Mesa is installed property and ensure that you have the appropriate kernel device drivers for your card. Most people (and distributions) use modules for their video card device drivers; run `lsmod` as root to see what modules are loaded. You should also make sure that you are loading the appropriate modules in your XF86Config and that your video device section is correct. Now try running an OpenGL application (other than FlightGear) to see how it performs. You can try the gears demo from Mesa or something like Quake3.

Why is my SGI machine so slow?

First of all, one of the most common mistakes on SGI hardware is to forget to specify --fog-fastest. On most SGI machines the EXP2 shading model isn't hardware supported resulting in frame rates below 1 frame per second (fps).

FlightGear makes extensive use of the OpenGL z-buffer feature,which on most older SGI hardware is only supported in software. This means that the CPU has to do all the z-buffer calculations in addition to the other tasks FlightGear involves (flight dynamics, scenery tracking, pushing commands into the graphics queue, etc). The following features are software rendered on low-end SGI machines (like Indy and Indigo):

  • stencil and accumulation buffer
  • depth queuing and depth buffering
  • fogging, lighting, clipping and transforms
  • texturing

This means that running FlightGear with the following options may not even get the desired result:

./runfgfs --fog-disable --shading-flat --disable-skyblend --disable-textures --disable-clouds --disable-sound --disable-panel --enable-hud --disable-anti-alias-hud

I could even imagine that adding --enable-wireframe doesn't work on these machines (I would be happy to be proven wrong though).

On a machine like O2 the following options give an acceptable result: ./runfgfs --fog-fastest --disable-sound

Since I don't have access to other SGI hardware I can't tell which options would be appropriate for your situation.

How do I see the frame rate?

On the menu select View, Rendering Options , then check the box that says Show Frame Rate

How do I toggle panel settings?

There are two ways. One way is to hide the panel without the HUD showing. To hide the panel, use Shift+P; To make the HUD disappear, use H. The second way is to use the alternative HUD by Shift+I (Use I to switch back).

Stuck upside down after "crash"?

In his infinite wisdom the FlightGear Grand Master decided that planes were too valuable to allow them to be destroyed by novice pilots who seemed to crash a lot. The fact that nobody has bothered to model crashes may have something to do with it too. :-)

The result of this as you have noticed is that with a little practice an ingenuity you can trim the ship to fly inverted along the ground.

The quick answer is to hit Ctrl+U (with the default key bindings) to warp the plane up 1000ft.

For the stubborn people out there: The trick to learn is to roll back to normal (non inverted) do this by nursing the elevator to get to about 500 feet or so and use the ailerons to snap roll 180*. This is all good avionics except for the plane not destroying itself. Remember the controls work in reverse when you are inverted and keep that airspeed up!!!

Why does FlightGear die on startup saying "time zone reading failed"?

This is probably caused by a line-ending problem in the timezone files. Win32 users can resolve the problem by downloading a DOS to UNIX conversion utility available at http://www.nottingham.ac.uk/~eazdluf/d2u.zip. Run as `d2u *.tab` from within the timezone directory to fix your timezone files.

Why won't the latest versions of some aircraft work in Flight Gear 9.10?

The latest FlightGear aircraft need to use some files such as new instrument files only released with version 1.0. If you are stuck with an older version of FlightGear you can try downloading an earlier version of the aircraft here : http://web.archive.org/web/20060204211745/www.flightgear.org/Downloads/aircraft/ or here:http://ftp.riken.go.jp/pub/FreeBSD/distfiles/flightgear-aircrafts/

Hacking

En quel langage informatique est écrit FlightGear ?

Mostly C++ with some supporting C code that's primarily contained within SimGear.

How do I design a flight dynamics model for a new aircraft?

To define an aircraft for FlightGear's primary FDM (JSBSIM), see http://jsbsim.sf.net/.

If you want a simpler FDM to work with, try your hand at YASim, an alternative FDM. For an guide on creating a YASim aircraft, look in the FlightGear base package for Aircraft-yasim/README.yasim.

Comment importer des avions à partir de Microsoft Flight Simulator ?

You can import planes by using the 3D Convert utility which will convert the MSFS 3d model to a format used by Flight Gear. You have to add the animations and parts.

Also, although you can import the 3D model and textures, the flight dynamics (the .AIR file) must be completely redone for FlightGear.

If you wish to import a model made with gmax, you will need to convert it to .MDL format using Microsoft's MakeMDL SDK which is available at http://zone.msn.com/flightsim/FS02DevDeskSDK08.asp.

Comment importer des scènes BGL de Microsoft Flight Simulator ?

See http://chiangt.virtualave.net/BGL/bgl_index.html.

How do I design or modify a panel?

See the README.xmlpanel file located in the FlightGear/docs-mini/ directory of the source distribution.


How do I place objects, like buildings, into FlightGear?

First, ensure that you have v0.7.7 or later, the scenery files where you plan to place the object, the actual model, and the longitude and latitude where you plan to place the object.

Now get the altitude for your point. If you don't want to calculate this yourself, start FlightGear at your location and take note of the altitude. Here's an example command:

fgfs --lat=45.50 --lon=-75.73 2>&1 | tee fgfs.log

The altitude is probably in feet, so divide the starting altitude by 3.28.

Search the output log file for the first occurrence of the string "Loading tile" and take note of the filename. In the above example, the output line looks like:

Loading tile /usr/local/Scenery/w080n40/w076n45/1712601

Copy a 3D model in a format that Plib understands to the same directory as the tile file. Edit the text file in that directory consisting of the tile name with the extension ".stg". The file will already exist if there is an airport on the tile; otherwise, you can create it from scratch. In our example, the filename is:

/usr/local/Scenery/w080n40/w076n45/1712601.stg

At the end of the file, add a new entry for your object, consisting of the word "OBJECT_STATIC" followed by the model name, the longitude in degrees, the latitude in degrees, the altitude in meters, and the heading in degrees. In our example the line looks like:

OBJECT_STATIC Towerax.ac -75.73 45.40 60 0

Save the changes to the .stg file, restart FlightGear, and enjoy.

NOTE: The above information was taken from the following mailing list post: http://www.geocrawler.com/archives/3/11854/2001/6/0/5991409/. See that page if this one doesn't make sense.

An alternative approach using PPE is described at http://mail.flightgear.org/pipermail/flightgear-devel/2001-December/002239.html by Norman Vine.

With Flightgear 0.9.10 there is an easy way for Placing 3D Objects with the UFO

See also FlightGear Scenery Designer .

Where can I learn 3D programming and how do I get involved?

Contributing to the 2D panel doesn't require any coding at all, just a minimal knowledge of XML syntax (i.e. five minutes' worth) and good skills with drawing and/or paint programs. Every instrument on the current panel, with the partial exception of the magnetic compass, is defined entirely in XML with no custom C++ code. If you want to get started, take a look at John Check's excellent intro (http://rockfish.net/fg/README.xmlpanel).

Likewise, if you want to create a 3D cockpit for FlightGear, or to create buildings, external aircraft models, etc., your help is *desperately* needed. The only rule is to go easy on the triangles -- a model with 50,000 triangles probably won't be usable in FlightGear, and one with 5,000 triangles, only marginally. If you can design a nice 3D cockpit interior for in a 3D design program such as AC3D or PPE, there may be coders who will be happy to add the support code in the C++.

If, on the other hand, you really want to get your hands dirty with C++ coding, you'll have to buy a good OpenGL book eventually. However, FlightGear uses a high-level library, PLIB, that hides most of the details of OpenGL. To get started with 3D C++ coding, you can take a look at the plib documentation and learn only as much OpenGL as you need, when you need it.

How do I add an airport?

You can add your airport to the $FGROOT/Airports/default.apt.gz file, but to get the airport to show up visually, you will have to rebuild the scenery around the airport. The format of the default.apt file is documented at http://www.flightgear.org/Docs/AirNav/AptNavFAQ.FlightGear.html.

How do I generate my own scenery?

Yes, though it can be a difficult task. FlightGear's scenery generation is handled by a sister project, TerraGear. For more details, see http://terragear.org/.

Flying

Why won't my engine(s) start?

Starting engine in single-engine aircraft

Aircraft vary in their starting procedure. Some may have an auto-start sequence menu entry or instructions in the aircraft help menu (Press "?").

But in general to start the engine on a piston-engine type aircraft, you need:

  1. Fuel - You can run out of fuel, of course, but for certain aircraft, FlightGear may load it with no fuel, making it impossible to start the engines. Check this in the menu Equipment/Fuel and Payload.
  2. Correct mixture (generally "rich", ie red knob all the way in)
  3. Magnetos on (R, L, or both--generally select "both")
  4. Throttle (some engines start better with a little gas)
  5. Hold starter for sufficient time.

You may be able to do all these functions with the standard 2-D panel or your aircraft's built-in panel. However using the standard key bindings is more reliable:

  1. Press/hold "m" to set mixture to rich (m=rich, M=lean--if you are at a very high elevation you may need to set it somewhere besides full rich)
  2. Press "}}}" (three times) to set magneto to R, L, and finally "Both".
  3. Open throttle a little.
  4. Press "s" to run the starter. For some aircraft you may have to hold "s" as long as 10 seconds before the engine starts.

Starting engine in multi-engine aircraft

Starting all engines in a multi-engine aircraft is similar to the single engine--except you must follow the same start sequence for each and every engine. Flightgear provides a convenient way to do this for all engines at once.

Note that the default 2-D panel is connected to only one engine. So if you try to start the engines using the 2-D panel controls you will most likely start only one engine.

Instead, use the keyboard to start all engines at once:

  1. Press "~" (select all engines)
  2. Press/hold "m" to set mixture to rich (m=rich, M=lean--if you are at a very high elevation you may need to set the mixture somewhere besides full rich)
  3. Press "}}}" (three times) to set magnetos to R, L, and finally "Both".
  4. Open throttle a little (it now controls all engines).
  5. Press "s" to run the starter (it now runs the starter on all engines). For some aircraft you may have to hold "s" as long as 10 seconds before the engine starts.
  6. Rev the engines a little with your throttle and check your tachometers and/or visually to be sure all engines are running.

Si les moteurs ne démarrent pas, assurez-vous que vous avez du carburant. Certains avions disposent de commutateurs pour contrôler quel réservoir de carburant alimente l'avion, donc vérifiez-les.

Make sure each engine you want to start is connected to a tank that has fuel. Check fuel tanks in the menu Equipment/Fuel and Payload.

Où puis-je apprendre le vol et la navigation aux instruments ?

http://www.navfltsm.addr.com/ est un très bon site pour apprendre les techniques de navigation.

Voir comment ça vole est un bon livre par, disponible gratuitement en ligne.

Veuillez consulter la section Understanding Navigation

What is the difference between Aileron and Rudder?

There is a bit of info on aileron vs. rudder in the very same book...

Peut-on voler en réseau ?

Oui, les deux versions Windows et *nix permettent le vol en réseau sur des serveurs FlightGear.

Wiki: Multiplayer_Howto

Une carte affichant en temps réel tous les avions volant en réseau est disponible :

FlightGear Online Server Map (voir aussi MPmap)

Où puis-je trouver sur Internet des informations sur les aéroports et des cartes aéronautiques ?

Aéroports :

Cartes :

Is there support for any military scenarios like dog fighting or bomb dropping?

Most of our developers are primarily interested and focused on civilian aviation. We aren't explicitly excluding these features -- we just haven't had anyone who has done much development in these areas until recently. Now there are third-party bombing scenarios for the A-10 and other aircraft with armament, like the North American OV-10A Bronco, General Dynamics F-16 and F-117 Nighthawk.

A new add-on (9/2009) adds support for dogfighting (including multiplayer dogfighting) and bombing scenarios.

FlightGear v0.7.6

Pourquoi ai-je une erreur dans le fichier viewer.cxx à propose d'une non-déclaration d'`exit' ?

Cette erreur est apparue après la mise à disposition de la version 0.7.6. Pour corriger le problème, ajoutez "#include <stdlib.h>" en haut du fichier viewer.cxx.

FlightGear v1.0.0

Comment puis-je devenir contrôleur aérien (ATC) ?

Il n'est pas encore possible de devenir ATC avec la version stable, il vous faudra donc télécharger la version CVS.