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Re: [certi-dev] FlightGear simulation latency

From: Martin Spott
Subject: Re: [certi-dev] FlightGear simulation latency
Date: Sat, 23 May 2009 12:21:42 +0000 (UTC)
User-agent: tin/1.9.3-20080506 ("Dalintober") (UNIX) (Linux/ (x86_64))

Hi Petr,

"Gotthard, Petr" wrote:

>> I just found out that using the RPR FOM (--hla=[...],RPR,RPR-FOM-
>> v1.0.fed)
>> induces just a fraction of the latency compared to using the ASN FOM
>> (--hla=[...],ASN,AviationSimNet-v3.1.fed). In consequence, using the
>> RPR FOM results in a latency which is similar to that of FlightGear's
>> native MultiPlayer protocol.
> Brilliant! I tell you why: The RPR FOM has entries for velocity and
> acceleration, while the ASN does not. The native dead reckoning
> algorithm thus works only for the RPR FOM, what makes the latency
> similar to the native MultiPlayer.

Oh yes, after re-reading through the different FOM's and the
corresponding player-xxx files I was already suspecting such a
I noticed that even RPR doesn't support angular acceleration -
appparently the folks at SISO don't consider it to be meaningful for
dead-reckoning in such a use case.

Thanks for sharing your insight with me,

P.S.: If the CERTI folks feel uneasy about me polluting the list with
      FlightGear-related stuff, please don't hesitate to complain.
 Unix _IS_ user friendly - it's just selective about who its friends are !

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