Re: [Flightgear-devel] Multiplay Jitter Problem with dual models flying in formation
On Monday 08 May 2006 21:37, Martin Spott wrote: Mathias Fröhlich wrote: If I find time, I have this on my ever growing todo list - no promise here ... We're always busy keeping Mathias' TODO-list serialized :-) :) Many interresting things to do ... Greetings Mathias -- Mathias Fröhlich, email: [EMAIL PROTECTED] --- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid0709bid3057dat1642 ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Multiplay Jitter Problem with dual models flying in formation
On Thursday 04 May 2006 08:16 pm, Greg Lisa wrote: I am working on a project that requires visualization of two drones flying in formation. Both drones are driven by an external source via native-fdm sockets. Even though both drones are being fed identical kinematics, I experience jitter between the drone models. The faster the drones move, causes an increase in jitter. Sounds like you need a smoothing algorithm. It seems the drones are being drawn at a lesser rate than the user position is updated. We used to have a similar problem in our AI and multiplayer systems, but these have been fixed. I don't know what the fixes were, but someone here does. Dave --- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Multiplay Jitter Problem with dual models flying in formation
Is the jitter between the drones relative position or are both drones equally displaced with respect to a common reference point (like the ground)? If you don't need absolute accuracy as to the drones' position then some form of a smoothing filter might work. OTH if precision is a must you may have to move to some sort of a deterministic scheduling approach to guarantee deliver of data packets via the socket on a frame-by-frame basis as well as the scene rendering. Keep in mind Linux and flightgear run in a pre-emptive task scheduling model, all timing, threads, and actions are subject to processing delays and other non-deterministic events. Regards John W. On Friday 05 May 2006 03:16, Greg Lisa wrote: I am working on a project that requires visualization of two drones flying in formation. Both drones are driven by an external source via native-fdm sockets. Even though both drones are being fed identical kinematics, I experience jitter between the drone models. The faster the drones move, causes an increase in jitter. The drones are displayed together via multiplayer mode using two pc platforms. I sure would appreciate any idea/suggestions on how I may eliminate the jitter problem. The following is the startup sequence that I use for both drones. --- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Multiplay Jitter Problem with dual models flying in formation
On Friday 05 May 2006 14:13, Paul Surgeon wrote: I guess what you're seeing is some sort of time sync issue between the two simulators or just a refresh rate that is too low due to no interpolation or extrapolation. Maybe the multiplayer code in 0.9.10 could be used for your application - IIRC it uses extrapolation to smooth out the updates and 10Hz seems to work fine. Paul This is more likely the 3-Hz-issue associated with AI models that Vivian has talked about. Ampere --- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
[Flightgear-devel] Multiplay Jitter Problem with dual models flying in formation
I am working on a project that requires visualization of two drones flying in formation. Both drones are driven by an external source via native-fdm sockets. Even though both drones are being fed identical kinematics, I experience jitter between the drone models. The faster the drones move, causes an increase in jitter. The drones are displayed together via multiplayer mode using two pc platforms. I sure would appreciate any idea/suggestions on how I may eliminate the jitter problem. The following is the startup sequence that I use for both drones. PC1: fgfs --airport-id=KVPS --aircraft=drone1 --fdm=external --callsign=Drone1 --native-fdm=socket,in,50,,5600,udp --multiplay=out,25,194.27.165.230,5503 --multiplay=in,25,194.27.165.220,5502 PC2: fgfs airport-id=KVPS aircraft=drone2 fdm=external callsign=Drone2 --native-fdm=socket,in,50,,5601,udp --multiplay=in,25,194.27.165.230,5503 --multiplay=out,25,194.27.165.220,5502 Thanks Gregory
