I've actually been looking at different approaches. I've started testing just
running FG in 50 millisecond real-time bursts using a TCP/UDP interface and my
initial tests seem to work. I have been tracking the elapsed sim time and on
average, it seems to run within the 50 millisecond time-frame.I still haven't
tested sending TCP instructions during that 50 milliseconds but my guess so far
is that it should work.
I appreciate you keeping this on your to-do list. I think i should probably
look into compiling FG and getting into that side of things.
Sterling
From: curtol...@gmail.com
Date: Fri, 3 Aug 2012 14:52:20 -0500
To: flightgear-users@lists.sourceforge.net
Subject: Re: [Flightgear-users] Slow Down Time
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
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