On May 7, 2007, at 3:32 PM, Curtis Olson wrote:
On 5/7/07, Adam Dershowitz wrote:
I have dug into this a little further and found something odd.
I found that the NMEA data is driven by /velocities/speed-east-fps
and /velocities/speed-north-fps. So I calculated these and added
them to my csv data file, and the playback config file. The oddity
is that even though my file now has them, these values are not
changing in FG. They remain 0. I am using the null FDM and a the
generic protocol, and all else seems to be working correctly, except
on the NMEA data, that is used by Atlas among other things, the
heading and speed are showing as zero.
Any ideas why I can't get the generic protocol to change these two
velocities when it can change other values just fine?
I don't recall about this specific set of properties, but you have
to be careful ... some fdm properties are derived from other
properties and auto calculated. I believe that most of the logic
for what is computed from what can be found in src/fdm/flight.[ch]xx
This code traces back to some of the earliest days of FlightGear so
it's a bit clunky in spots, but it works.
Regards,
Curt.
--
Curt,
I tried digging in the code some. I then did an interesting test. I
just tried hand flying while recording data using the included
playback.xml:
--generic=file,out,1,FG_test1.csv,playback
then playing it back with this:
--generic=file,in,1,FG_test1.csv,playback --fdm=null
The odd thing is that given this xml that seems to record most of the
data, when I playback the data /velocities/speed-east-fps remains
0.0. So it does seem like there is a bug.
Any ideas?
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