On Tue, Apr 21, 2009 at 3:41 AM, Melchior FRANZ wrote:
> * Carson Fenimore -- 4/21/2009 3:49 AM:
> > I don't see any way to feed waypoints remotely
>
> See the top of file $FG_ROOT/gui/dialogs/route-manager.xml:
>
>
> http://cvs.flightgear.org/viewvc/data/gui/dialogs/route-manager.xml?revision=1.10&view=markup
>
> All route-manager/waypoint functions are accessible via input
> property /autopilot/route-manager/input. This works with any
> remote property access method, such as http, telnet etc.
>
> | command interface /autopilot/route-manager/input:
> |
> | @clear ... clear route
> | @pop ... remove first entry
> | @delete3 ... delete 4th entry
> | @insert2:k...@900 ... insert "k...@900" as 3rd entry
> | k...@900 ... append "k...@900"
>
>
> Example:
>
> $ telnet localhost 5500
> set /autopilot/route-manager/input k...@5000
>
Melchior's suggestion is probably the easiest way to feed in remote
waypoints.
Another possible idea is to realize that you can remotely control all the
autopilot settings through the telnet interface, so you could remotely store
the waypoints or whatever your flight plan/strategy/routing algorithm is,
and just remotely manipulate the autopilot settings to adjust target
heading, target altitude, target speed, etc. As an example, I developed a
series of perl scripts that automatically fly all the FAA Level 3 FTD
certification tests by remotely operating a combination of the FlightGear
autopilot, directly manipulating the controls in some instances, and
monitoring certain key values. Optionally these scripts could turn on data
logging of specific parameters and even plot the result with gnuplot (for
tests that require a validation plot.) So the point is that if you need to
get more creative than just following waypoints, there is a heck of a lot of
cool stuff you can do with the remote telnet interface.
Another thing I did that was a lot of fun was to manipulate the autopilot to
track other multiplayer aircraft. I did this using nasal which is another
good option. The script would try to match altitude, and speed, of the
target aircraft and fly a specific trailing distance (if it was too far back
it would fly a bit faster than the target aircraft, too close and it would
fly a bit slower than the target aircraft.) Then it would set the autopilot
heading to fly to the current position of the lead aircraft. This in
combination with Melchior's new HUD which can draw circles around all the AI
and MP aircraft in the scene is a lot of fun.
On the subject of capturing a movie of FlightGear: I have never found a
software solution that I've been happy with. Everything I've tried has
reduced the frame rate substantially. I think the best way to get a clean
video without affecting program operation and competing for CPU and graphics
resources is to get a scan converter ... this takes vga out and converts it
to NTSC/PAL which you can then record directly onto some video recording
device. These devices can down sample from higher resolutions and even be
able to zoom into record portions of the screen. You can get some very
nice, very clean, very smooth results, but it requires external equipment.
Another thing I've done which I actually like is to point a video camera at
the screen. If you can get the lighting and color balance to not be
horrible and are careful with your camera work, then you can get some decent
results ... natural camera shake, ability to pan a bit around the screen or
rotate the camera a bit to follow the horizon or the aircraft ... there are
some nice subtle things you can do ... but taking a movie of your monitor
will almost certainly result in at least a little (or more likely
substantial) loss of color quality. And if you aren't careful, you'll catch
the edge of the monitor and the sorrounding room, catch background noises,
etc. and the result can be really lousy.
Regards,
Curt.
--
Curtis Olson: http://baron.flightgear.org/~curt/
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