Caleb N. Bonilla writes:
> I am trying to log what the FDM is doing, but I am unsure if it is
> working...I was using the c172 (JSBsim) and used the keystorke Shift-F10,
> and I would assume a CSV file should appear in the same bin folder as
> fgfs, no?  Any advice?

Have a look at the "File->Logging" menu in the main menu bar.  That
will bring up a dialog box where you can enter the properties you want
to log and the data collection rate.

Notice that you have to enable logging with the big circular button at
the top center of the dialog box *AND* you have to enable each field
individually that you want to log.

My impression is that the logging dialog box is really not meant for
serious use, and is there more as a proof of concept or place holder.
It shows you want you can do, but if you really want to do logging,
you probably want to set up different fields, and perhaps log more
than 9 fields.  In that case you can a) edit your preferences.xml to
setup different defaults, or b) use the "telnet" interface with a
remote script to set up the fields exactly like you want and enable
logging.

The core logging code is *really* nice, *really* flexible, and works
*really* great.  It's just the default interface that is a little
clunky.

For a side project, I've written an external perl-tk script that
presents a gui with all the possible fields I want to log (about 25
fields).  You can turn any field on/off individually, select the file
name, etc.  Then you can click start logging and stop logging, and it
all works great.  The perl-tk script talks to FlightGear via the
"telnet" interface and takes care of all the details of setting up the
logging configuration inside of FlightGear.  This works well for me,
because in my case there is a limited set of fields I know in advance
that I want to log.  I also did a quick hack and wrote a little front
end to gnuplot where I can select a data file, then be presented with
a drop down box of all the fields logged in that file, and can pick
any one of them individually and graph it against time.  I know Jon
has done something similar for JSBsim, but I needed this all wrapped
up in the context of a larger gui application.

Regards,

Curt.
-- 
Curtis Olson   HumanFIRST Program               FlightGear Project
Twin Cities    curt 'at' me.umn.edu             curt 'at' flightgear.org
Minnesota      http://www.flightgear.org/~curt  http://www.flightgear.org

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