For one of my projects, I also have an interest in slowing down FlightGear
below real time rates (for some possible human factors experiments.)
Currently our time multiplier is an integer and it should be a pretty
trivial patch to convert this to a floating point value which would allow
fractional multipliers. However, I decided not to work on this until after
the 2.8.0 release so as to not create an inadvertent problem right before a
major release.
Now that we have a 2.8.0 release branch we could start working on new
features, but my available time will be sucked up in release activities
between now and at least a week or two after the release.
Regards,
Curt.
On Tue, Jul 31, 2012 at 2:31 PM, Sterling Somers <brother...@hotmail.com>wrote:
> I have tried both the speed-up (doesn't work) and the frame-rate way.
> The frame rate way MIGHT work but how much time is simtime in realtime?
> Here's a quick bit on my project:
>
> I am trying to simulate pilots. The psychology simulation (ACT-R) software
> I use uses a "50 millisecond" time cycle (it does not run in real time). I
> would like to unpause/pause flightgear for every ACT-R cycle, having
> flightgear run for 50 real time milliseconds worth of time, before ACT-R
> runs it cycle. By slowing flightgear down, I was hoping to run it for some
> amount of time (say, 1 second real time), such that flightgear runs for 50
> milliseconds of flightgear-simulated time. This is to get the simulator and
> ACT-R as close as possible to be synchronized.
>
> Thanks,
>
> Sterling
>
> ------------------------------
> From: brother...@hotmail.com
> To: flightgear-users@lists.sourceforge.net
> Date: Mon, 30 Jul 2012 15:25:06 -0400
>
> Subject: Re: [Flightgear-users] Slow Down Time
>
>
> I know it's been a long time since your reply but I've just gotten back on
> the project and gave your reply a read. I did a quick test and it looks
> like this solution should do what I want... I'll try it out.
>
> Thanks muchly,
>
> Sterling
>
> Date: Fri, 17 Feb 2012 08:34:55 +0100
> From: anders-...@gidenstam.org
> To: flightgear-users@lists.sourceforge.net
> Subject: Re: [Flightgear-users] Slow Down Time
>
> On Thu, 16 Feb 2012, Sterling Somers wrote:
>
> > Does anyone know of a way to slow down time to less-than-real time? I
> > know warp will allow you to speed-up time, but it seems it canÿÿt be
>
> > fractional. IS there another way to do that perhaps?
>
> There is no obvious reason for why that should not be possible (though
> some subsystems may inappropriately use real time instead of simulation
> time).
>
>
> Have you tried setting the property /sim/speed-up to a fractional value
> directly? (It appears to be a double in the property tree - but I don't
> know if that is actually the property used to set the simulation rate.)
>
>
> Another (hackish) way that should work is to set
> /sim/frame-rate-throttle-hz to a frame rate your system achives (say 50)
> and
> /sim/max-simtime-per-frame to less than 1/50, say 0.01 to force a
> simulation rate of 0.5 or less (depending on your frame rate).
>
>
> Properties can be set from the command line with
> --prop:/sim/frame-rate-throttle-hz=50
> --prop:/sim/max-simtime-per-frame=0.01
> or in FG via the property browser (I think these properties can be changed
> at runtime - but that is not the case for all properties).
>
>
> Cheers,
>
> Anders
> --
> ---------------------------------------------------------------------------
> Anders Gidenstam
> WWW: http://gitorious.org/anders-hangar
>
> http://www.gidenstam.org/FlightGear/
>
>
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--
Curtis Olson:
http://www.atiak.com - http://aem.umn.edu/~uav/
http://www.flightgear.org - http://gallinazo.flightgear.org
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