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List: flightgear-users
Subject: Re: [Flightgear-users] Slow Down Time
From: Sterling Somers <brother_wu () hotmail ! com>
Date: 2012-07-31 19:31:15
Message-ID: BAY170-W133D85E99B2AFB565CF44BBE6C50 () phx ! gbl
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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_wu@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-www@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 can˙˙t 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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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? <br>Here's a quick bit \
on my project:<br><br>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. <br><br>Thanks,<br><br>Sterling<br><br><div><div \
id="SkyDrivePlaceholder"></div><hr id="stopSpelling">From: \
brother_wu@hotmail.com<br>To: flightgear-users@lists.sourceforge.net<br>Date: Mon, 30 \
Jul 2012 15:25:06 -0400<br>Subject: Re: [Flightgear-users] Slow Down Time<br><br>
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<div dir="ltr">
<br>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.<br><br>Thanks \
muchly,<br><br>Sterling <br><br><div><div id="ecxSkyDrivePlaceholder"></div>Date: \
Fri, 17 Feb 2012 08:34:55 +0100<br>From: anders-www@gidenstam.org<br>To: \
flightgear-users@lists.sourceforge.net<br>Subject: Re: [Flightgear-users] Slow Down \
Time<br><br><pre>On Thu, 16 Feb 2012, Sterling Somers wrote:<br> <br>> Does anyone \
know of a way to slow down time to less-than-real time? I <br>> know warp will \
allow you to speed-up time, but it seems it can˙˙t be <br>> fractional. IS there \
another way to do that perhaps?<br> <br>There is no obvious reason for why that \
should not be possible (though <br>some subsystems may inappropriately use real time \
instead of simulation <br>time).<br> <br>Have you tried setting the property \
/sim/speed-up to a fractional value <br>directly? (It appears to be a double in the \
property tree - but I don't <br>know if that is actually the property used to set the \
simulation rate.)<br> <br>Another (hackish) way that should work is to \
set<br>/sim/frame-rate-throttle-hz to a frame rate your system achives (say \
50)<br>and<br>/sim/max-simtime-per-frame to less than 1/50, say 0.01 to force a \
<br>simulation rate of 0.5 or less (depending on your frame rate).<br> <br>Properties \
can be set from the command line \
with<br>--prop:/sim/frame-rate-throttle-hz=50<br>--prop:/sim/max-simtime-per-frame=0.01<br>or \
in FG via the property browser (I think these properties can be changed <br>at \
runtime - but that is not the case for all properties).<br> <br>Cheers,<br> \
<br>Anders<br>-- <br>---------------------------------------------------------------------------<br>Anders \
Gidenstam<br>WWW: <a href="http://gitorious.org/anders-hangar" \
target="_blank">http://gitorious.org/anders-hangar</a><br> <a \
href="http://www.gidenstam.org/FlightGear/" \
target="_blank">http://www.gidenstam.org/FlightGear/</a><br></pre><br>------------------------------------------------------------------------------
Virtualization & Cloud Management Using Capacity Planning
Cloud computing makes use of virtualization - but cloud computing
also focuses on allowing computing to be delivered as a service.
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Flightgear-users mailing list
Flightgear-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/flightgear-users</div> </div>
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https://lists.sourceforge.net/lists/listinfo/flightgear-users</div> \
</div></body> </html>
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Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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