FG_ROOT
If FG_ROOT is set and --fg-root is not set, it specifies the root data directory to use.
An alternative flightgear viewer application
fgviewer [--fg-root
rootdir]
[--fg-scenery
scenerydir]
[--config
configfile]
[--prop
property
value]
[--renderer
rend]
[--hla]
[--federation
fed]
fgviewer is a viewer application that allows you to examine FlightGear scenery and objects without starting fgfs(1).
--fg-root rootdir
Set the FlightGear data root directory ($FG_ROOT) to rootdir. If this option is not set, fgviewer uses the path specified in the FG_ROOT environment variable or, absent that, the FlightGear data directory chosen at the time the program was compiled.
--fg-scenery scenerydir
Set the FlightGear scenery directory ($FG_SCENERY) to scenerydir. If this option is not set, fgviewer uses the path specified in the FG_SCENERY environment variable or, absent that, the Scenery subdirectory inside $FG_ROOT.
--config configfile
Read configuration directives from configfile.
--prop property valueSet the property named property to value.
--renderer rend
Use the renderer named rend to render the scenery. This option is currently not supported.
--hla
Enable HLA federation.
--federation fed
Enable a custom federation named fed.
fgviewer exits with EXIT_SUCCESS on success, with EXIT_FAILURE if the syntax of the command-line arguments is wrong or an error occurs.
FG_ROOT
If FG_ROOT is set and --fg-root is not set, it specifies the root data directory to use.
FG_SCENERY
If FG_SCENERY is set and --fg-scenery is not set, it specifies the scenery directory to use.
$FG_ROOT/defaults.xml
Default preferences file loaded on startup.
Unchanged in 4 releases since Debian 10 (Buster).