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The FOM is a set of XML files in [https://sourceforge.net/p/flightgear/fgdata/ci/next/tree/HLA/ fgdata/HLA/] | The FOM is a set of XML files in [https://sourceforge.net/p/flightgear/fgdata/ci/next/tree/HLA/ fgdata/HLA/] | ||
The orientation data in the FOM (SGOrientationWGS84) are Quaternions ([https://en.wikipedia.org/wiki/Quaternion https://en.wikipedia.org/wiki/Quaternion]), and those are the i,j,k values. From memory, the orientation is relative to a earth-centered-frame, and there are functions in SimGear to convert to heading/pitch/roll in combination with the object's position. | |||
<ref> {{cite web | |||
| url = http://forum.flightgear.org/viewtopic.php?p=280098#p280098 | |||
| title = <nowiki>Re: HLA </nowiki> | |||
| author = <nowiki>stuart</nowiki> | |||
| date = Mar 21st, 2016 | |||
| added = Mar 21st, 2016 | |||
| script_version = 0.25 | |||
}}</ref> <ref>{{cite web | |||
| url = http://sourceforge.net/p/flightgear/mailman/message/34963798/ | |||
| title = <nowiki>Re: [Flightgear-devel] HLA</nowiki> | |||
| author = <nowiki>Stuart Buchanan</nowiki> | |||
| date = Mar 24th, 2016 | |||
| added = Mar 24th, 2016 | |||
| script_version = 0.25 | |||
}} | |||
</ref> | |||
Richard's [[Emesary]] system would also probably work quite well with the HLA FOM to give us a way for models to communicate with other models.<ref> {{cite web | |||
| url = http://sourceforge.net/p/flightgear/mailman/message/34985731/ | |||
| title = <nowiki>[Flightgear-devel] Message passing interface for Nasal</nowiki> | |||
| author = <nowiki>Richard Harrison</nowiki> | |||
| date = Apr 1st, 2016 | |||
| added = Apr 1st, 2016 | |||
| script_version = 0.25 | |||
}} | |||
</ref> | |||
{{Appendix}} | |||
==Federates== | ==Federates== | ||
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For some Subsystems split off from the existing FlightGear source, it's fairly easy to create an executable with its own property tree<ref>https://sourceforge.net/p/flightgear/mailman/message/34632142/</ref> and have shared C++ code to map FOM objects to property values. However, this is an implementation detail - the whole point of HLA and the FOM is that it makes no assumptions about what Federates do with the data. | For some Subsystems split off from the existing FlightGear source, it's fairly easy to create an executable with its own property tree<ref>https://sourceforge.net/p/flightgear/mailman/message/34632142/</ref> and have shared C++ code to map FOM objects to property values. However, this is an implementation detail - the whole point of HLA and the FOM is that it makes no assumptions about what Federates do with the data. | ||
Regarding weather, in a HLA/RTI context the way to do this would be to have a weather engine as an RTI Federate. This would run any required weather simulation, and pass (very) local weather conditions to each of the aircraft/tower/windsock in the simulation, plus publish position information on clouds for use by visualiation engines.<ref>{{cite web | |||
|url = https://sourceforge.net/p/flightgear/mailman/message/35595300/ | |||
|title = <nowiki> Re: [Flightgear-devel] Traffic 2020: Towards a new Development | |||
Model for FlightGear AI Traffic </nowiki> | |||
|author = <nowiki> Stuart Buchanan </nowiki> | |||
|date = Jan 10th, 2017 | |||
|added = Jan 10th, 2017 | |||
|script_version = 0.40 | |||
}}</ref> | |||
==Current Status == | ==Current Status == | ||
Last updated: ( | Last updated: (13/01/2017) | ||
Stuart is cautiously optimistic that he may be able to provide the start of a HLA implementation quite soon, as one of the blocking factors may be resolved soon.<ref>{{cite web | |||
|url = https://sourceforge.net/p/flightgear/mailman/message/35595300/ | |||
|title = <nowiki> Re: [Flightgear-devel] Traffic 2020: Towards a new Development | |||
Model for FlightGear AI Traffic </nowiki> | |||
|author = <nowiki> Stuart Buchanan </nowiki> | |||
|date = Jan 10th, 2017 | |||
|added = Jan 10th, 2017 | |||
|script_version = 0.40 | |||
}}</ref> | |||
Currently, there is some very old HLA support in SimGear. This is very out of date and should be ignored. | Currently, there is some very old HLA support in SimGear. This is very out of date and should be ignored. | ||
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* Pick up Environment Objects for this instance and use them to set the local METAR string for weather generation. | * Pick up Environment Objects for this instance and use them to set the local METAR string for weather generation. | ||
{{See also|FGTraffic}} | |||
We currently have the following other Federates: | We currently have the following other Federates: | ||
* '''fgogel''' - An AI model written in python the publishes over to the RTI. Part of SimKit, but handy nevertheless! | * '''fgogel''' - An AI model written in python the publishes over to the RTI. Part of SimKit, but handy nevertheless! | ||