FlightGear - Flight Simulator

* Justin Smithies -- Sunday 26 March 2006 22:33:
> I want to make a nasal script that watches controls/gear/gear-down using a 
> listener.
> 
> When called this is what i would like to happen.
> 
> If /systems/electrical/volts > 22 then let the gear go up or down.
> If /systems/electrical/volts < 22 then make the gear stay where they are.

  gearDown = controls.gearDown;
  controls.gearDown = func(down) {
          if (getprop("/systems/electrical/volts") > 22) {
                  gearDown(down);
          }
  }



> gear = func {
> power = getprop("/systems/electrical/volts");
> status = getprop("controls/gear/gear-down");
> if (power > 22 and status == 1) {
>  setprop("controls/gear/gear-down", 1);}
[...]
> setlistener("controls/gear/gear-down", gear);
>
> See what i mean ? All messed up ;)

Yes, especially since you don't use proper indenting. And you are
trying to change a property from its own listener, which isn't a good
idea.

m.

Or better:

   gearDown = controls.gearDown;
   controls.gearDown = func(down) {
           if (!down or getprop("/systems/electrical/volts") > 22) {
                   gearDown(down);
           }
   }

... because stopping the gear movement should always be allowed.  ;-)
Even smarter would be to watch the voltage and to stop the gear movement
as soon as it drops. Can all be done with Nasal.

m.

Thankyou just what i needed.

Maybe one day i will be as good at nasal as you. ;)

Cheers
Justin Smithies


On Sunday 26 March 2006 22:10, Melchior FRANZ wrote:
> Or better:
>
>    gearDown = controls.gearDown;
>    controls.gearDown = func(down) {
>            if (!down or getprop("/systems/electrical/volts") > 22) {
>                    gearDown(down);
>            }
>    }
>
> ... because stopping the gear movement should always be allowed.  ;-)
> Even smarter would be to watch the voltage and to stop the gear movement
> as soon as it drops. Can all be done with Nasal.
>
> m.
>
>
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Another nasal question then if you can help.

How do i also make the flaps and rudder very sluggish ( Not very responsive ( 
Heavy ))  if the volts are below 22 ?

I know this sounds daft but i am getting somewhere .
I will be chaning the checks to hydraulics as soon as i have that running.
Just need to work out some more details.

Regards,
Justin Smithies


On Sunday 26 March 2006 22:22, Justin Smithies wrote:
> Thankyou just what i needed.
>
> Maybe one day i will be as good at nasal as you. ;)
>
> Cheers
> Justin Smithies
>
> On Sunday 26 March 2006 22:10, Melchior FRANZ wrote:
> > Or better:
> >
> >    gearDown = controls.gearDown;
> >    controls.gearDown = func(down) {
> >            if (!down or getprop("/systems/electrical/volts") > 22) {
> >                    gearDown(down);
> >            }
> >    }
> >
> > ... because stopping the gear movement should always be allowed.  ;-)
> > Even smarter would be to watch the voltage and to stop the gear movement
> > as soon as it drops. Can all be done with Nasal.
> >
> > m.
> >
> >
> > -------------------------------------------------------
> > This SF.Net email is sponsored by xPML, a groundbreaking scripting
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> > _______________________________________________
> > Flightgear-devel mailing list
> > Flightgear-devel@...
> > https://lists.sourceforge.net/lists/listinfo/flightgear-devel
>
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* Justin Smithies -- Sunday 26 March 2006 23:56:
> Another nasal question then if you can help.
> 
> How do i also make the flaps and rudder very sluggish ( Not very responsive ( 
> Heavy ))  if the volts are below 22 ?

For example:

  var flaps = props.globals.getNode("/controls/flight/flaps");

  flapsDown = func(mode) {
          var voltage = getprop("/systems/electrical/volts");
          if (!mode or voltage < 10) {
                  interpolate(flaps);
                  return;
          }
          var target = mode > 0 ? 1 : 0;
          var time = 6 + abs(22 - voltage) * 2.345;  # time for full movement
          interpolate(flaps, target, abs(flaps.getValue() - target) * time);
  }

  settimer(func { controls.flapsDown = flapsDown }, 1);


The flaps can also be stopped from outside with  interpolate(flaps). You
may want to use more clever time calculation.

m.

* Justin Smithies -- Sunday 26 March 2006 23:56:
> How do i also make the flaps and rudder very sluggish ( Not very responsive ( 
> Heavy ))

Oh, and the rudder ...

There's no controls wrapper for the rudder. The joysticks change
/controls/flight/rudder directly. So you just make the FDM not listen
to this property, but to another, let's say /controls/flight/rudder-fdm.
And then you write a function that reads from /controls/flight/rudder
and writes it to .../rudder-fdm with some added sluggishness. You could
do that with a simple EWMA lowpass filter, whose coefficient changes with
voltage.

m.

Could you help me with the suggestion you made below for the rudder ?

Cheers,
Justin Smithies


On Sunday 26 March 2006 23:49, Melchior FRANZ wrote:
> * Justin Smithies -- Sunday 26 March 2006 23:56:
> > How do i also make the flaps and rudder very sluggish ( Not very
> > responsive ( Heavy ))
>
> Oh, and the rudder ...
>
> There's no controls wrapper for the rudder. The joysticks change
> /controls/flight/rudder directly. So you just make the FDM not listen
> to this property, but to another, let's say /controls/flight/rudder-fdm.
> And then you write a function that reads from /controls/flight/rudder
> and writes it to .../rudder-fdm with some added sluggishness. You could
> do that with a simple EWMA lowpass filter, whose coefficient changes with
> voltage.
>
> m.
>
>
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Damn ,
             Must be something daft here can you look at this file for me as i 
get this error ..

Nasal parse error: illegal character 
in /opt/flightgear/share/FlightGear/Aircraft/737-300/Systems/Conditions/Conditions.nas, 
line 19

I cant see anything wrong , but i'm not an expert at nasal.

Thanks in advance ( There's a beer with your name on it should we meet )

Justin smithies


On Sunday 26 March 2006 23:38, Melchior FRANZ wrote:
> * Justin Smithies -- Sunday 26 March 2006 23:56:
> > Another nasal question then if you can help.
> >
> > How do i also make the flaps and rudder very sluggish ( Not very
> > responsive ( Heavy ))  if the volts are below 22 ?
>
> For example:
>
>   var flaps = props.globals.getNode("/controls/flight/flaps");
>
>   flapsDown = func(mode) {
>           var voltage = getprop("/systems/electrical/volts");
>           if (!mode or voltage < 10) {
>                   interpolate(flaps);
>                   return;
>           }
>           var target = mode > 0 ? 1 : 0;
>           var time = 6 + abs(22 - voltage) * 2.345;  # time for full
> movement interpolate(flaps, target, abs(flaps.getValue() - target) * time);
> }
>
>   settimer(func { controls.flapsDown = flapsDown }, 1);
>
>
> The flaps can also be stopped from outside with  interpolate(flaps). You
> may want to use more clever time calculation.
>
> m.
>
>
> -------------------------------------------------------
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> webcast and join the prime developer group breaking into this new coding
> territory!
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> _______________________________________________
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> Flightgear-devel@...
> https://lists.sourceforge.net/lists/listinfo/flightgear-devel

* Justin Smithies -- Monday 27 March 2006 01:14:
> Could you help me with the suggestion you made below for the rudder ?

Something like this, whereby you feed /controls/flight/rudder-fdm to the
fdm. And you need to tweak the values, or write a better coefficient.
(Shouldn't be hard, mine is probably nonsense. :-)


  pow = func(v, w) { math.exp(math.ln(v) * w) }

  var voltage = props.globals.getNode("/systems/electrical/volts", 1);
  var rudderIn = props.globals.getNode("/controls/flight/rudder");
  var rudderOut = props.globals.getNode("/controls/flight/rudder-fdm", 1);
  rudderOut.setValue(rudderIn.getValue());

  rudderFilter = func  {
          var coeff = 1 / pow(10, (22 - voltage.getValue()) / 10);
          rudderOut.setValue(rudderOut.getValue() * (1 - coeff)
                          + rudderIn.getValue() * coeff);
          settimer(rudderFilter, 0.01);
  }

  settimer(rudderFilter, 0);

m.

Olaf Flebbe wrote :
> Hi,
>
> sorry for the delay....
>
> I second that config.h-msvc6.in (having cygwin to compile MSVC) is plai=
n silly.
>
> You may have noticed that the Version in CVS has a config.h-msvc8
> without the @VERSION@ madness.
>  =20

Call it silly or madness if you want. In the meantime, you don't resolve
the issue that this file never had the right version in every tarball
made by Curt before that.

-Fred

--=20
Fr=E9d=E9ric Bouvier
http://frfoto.free.fr         Photo gallery - album photo
http://www.fotolia.fr/p/2278  Other photo gallery
http://fgsd.sourceforge.net/  FlightGear Scenery Designer

--- Melchior FRANZ wrote:
> The airports list is barely usable: there are so many entries
> in it that you don't easily find anything. And the slider resolution
> is much too high for finding an entry with it alone. Move it
> just one pixel, and you jumped over oodles of airports. The arrow
> buttons have no repeat function, so they are of limited help, too.
> I've now hacked the airports widget to allow filtered lists:
> 
>   http://members.aon.at/mfranz/airports.jpg  [30 kB]
> 
> m.

That's a great improvement. It makes the airport list way more useful.
While filters by area would be nice, just allowing users to search for
their local airport is going to make things much easier for newbies.

BTW, I have a text file with the mapping from ICAO prefixes to country
names that I wrote a while ago for a mission generator project if you want
it. Might save you some time if you're thinking of enhancing it further.

-Stuart


		
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* Melchior FRANZ -- Sunday 26 March 2006 17:00:
> * Melchior FRANZ -- Sunday 26 March 2006 09:47:
> > I'm still investigating if this change works with all our dialogs.
> > Maybe one would have to add a "dialog-update" on some places.
> 
> Yes, indeed. Comboboxes need a "dialog-update", as well as [...]

Um, no. I take that back. They work fine.  :-)

m.

* Melchior FRANZ -- Sunday 26 March 2006 17:00:
> Yes, indeed. Comboboxes need a "dialog-update", as well as the
> frequency swapper buttons in the radio dialog, [...]

No. This was caused by updating plib to CVS/HEAD, which seems to be
broken. Works with  $ cvs up -D'2 weeks ago'.

I haven't found any problems with other dialogs so far, and I'd
suggest to consider that for inclusion before the 0.9.10 release.

I've fixed a minor bug in the airports.xml dialog file:

  http://members.aon.at/mfranz/airports.tar.gz  [2 kB]

m.

* Buchanan, Stuart -- Sunday 26 March 2006 18:01:
> BTW, I have a text file with the mapping from ICAO prefixes to country
> names that I wrote a while ago for a mission generator project if you want
> it. Might save you some time if you're thinking of enhancing it further.

I have such a file, too (country.nas), but it can't hurt to compare that with
your version and the Wikipedia page. Yes, please send it to me. Thanks.

m.

On 26/03/06, Erik Hofman <erik@...> wrote:

> For those of you who feel the desire to model the lead-acid aircraft
> battery up to a bizarre level you could visit the Gill site:
>
> http://www.gillbatteries.com/manual.cfm

I'll be buying a new GIll battery in a couple of weeks.

For FlightGear, I think it's probably sufficient simply to model the
fact that the battery discharges (very rapidly, during cranking), that
the alternator or generator recharges it, that the alternator will not
work with a completely flat battery (though a generator will), and
that the battery cannot hold as large a charge when it's cold.


All the best,


David

--
http://www.megginson.com/

David Megginson wrote:
> On 26/03/06, Erik Hofman <erik@...> wrote:
> 
>> For those of you who feel the desire to model the lead-acid aircraft
>> battery up to a bizarre level you could visit the Gill site:
>>
>> http://www.gillbatteries.com/manual.cfm
> 
> I'll be buying a new GIll battery in a couple of weeks.
> 
> For FlightGear, I think it's probably sufficient simply to model the
> fact that the battery discharges (very rapidly, during cranking), that
> the alternator or generator recharges it, that the alternator will not
> work with a completely flat battery (though a generator will), and
> that the battery cannot hold as large a charge when it's cold.

I already thought that simulating shelve discharging would be pretty 
bizarre :-)

Erik

-- 
http://www.ehtw.info (Dutch)	Future of Enschede Airport Twente
http://www.ehofman.com/fgfs	FlightGear Flight Simulator
http://www.cafepress.com/fgfs_flightsim	 FlightGear Art

On 26/03/06, Erik Hofman <erik@...> wrote:

> I already thought that simulating shelve discharging would be pretty
> bizarre :-)

In extremely cold temperatures in northern Canada and Alaska, pilots
sometimes remove the batteries from their planes and bring them inside
with them; sometimes they even drain all their oil and keep it
indoors.


All the best,


David

--
http://www.megginson.com/