While the idea is correct in principle, what you said it is not so straightforward.
I've realised a flight recorder and a flight player for Flightgear for my thesis so I played around with few ideas. Basically I developed a virtual cockpit in a distributed environment that uses Flightgear to have some 'meaningful' flight data. I had to test different configurations so I needed to use always the same data that is to fly always the same flight. My experience is that it's very difficult to synchronise Flightgear with an initial-position-and-flight-command approach since the only cross-platform means of communication available is the socket. You always end up with a time shifting of the packets that produces a space shifting of the flight. Therefore sometimes you try to manouevre into a mountain while you did't in the original flight. Now what i've done is to record, through a socket, all the flight at an accettable frame rate onto a file by using the native-fdm data structure. (this is the recorder). Then I wrote a player that reads the file and sends the data over to Flightgear (previously set up with the external-fdm option). It works quite well apart from some adjustment in the speed of replay you need to experiment with. Roberto --- Harald JOHNSEN <[EMAIL PROTECTED]> ha scritto: > [EMAIL PROTECTED] wrote: > > > Does this mean that we would have the ability to > save and load flight > > data so as to reproduce, say, a taxi, take off, > pattern and landing at > > KSFO or another airport automatically (i.e., as a > demo or as a > > training exercise). Perhaps a short flight around > the SF area also > > showing off the new scenery? > > > > Could we ship such flights around scenic areas > (Mount Ranier, Crater > > Lake, the Grand Canyon) for new users in the base > package or as > > downloadables off of flightgear.org? > > > > How big would such files be? How much data needs > to be kept, how much > > can be calculated on the fly? Do weather > conditions need to be saved > > also? > > > > Would flights around scenic areas be done better > as flight plans with > > waypoints or tied into this new playback method > somehow? > > > > Can this playback tool be used as a training > method for new simulator > > pilots? > > > > If we are not saving a real recorded flight, > perhaps we can use a > > similar method to extract either entire flights or > the last XX number > > of seconds of a flight to save to disk for later > replay? > > > > MS FlightSimulator has an extensive tutorial that > involves pre-saved > > flights which the users can break into at certain > points in the > > flights. How difficult would it be to add > something similar to FG and > > where would one begin (if no one is already > working on something like > > this). > > > > Thanks! > > > > Ima > > > > > > _______________________________________________ > > Flightgear-devel mailing list > > [EMAIL PROTECTED] > > > http://mail.flightgear.org/mailman/listinfo/flightgear-devel > > 2f585eeea02e2c79d7b1d8c4963bae2d > > > I think that the ability to "play" a flight recorded > by an external > source is different from the ability to save/load a > flight from FG. > In other words, I don't think we should save any > state variable - ie > parts of totality of the property tree. > We have an initial state when FG is launched with a > specific set of > parameters. Now how do you fly ? You use your > joystick, mouse, > keyboard et al to interact with the simulator. So a > recorded fligth > could be defined as a list of user interactions > paired with a time stamp, > and to be more accurate a very limited set of > properties could be added > lets say every 10 or 20 seconds (position, heading, > etc). > The advantage would be : > - short record file size > - accurate property tree because the simultor > would run exactly with > the same imputs > - easy to implement because it is not tied to > the internals of the > simulator (like fdm). > > Harald. > > > _______________________________________________ > Flightgear-devel mailing list > [EMAIL PROTECTED] > http://mail.flightgear.org/mailman/listinfo/flightgear-devel > 2f585eeea02e2c79d7b1d8c4963bae2d > ___________________________________ Yahoo! Mail: gratis 100 MB per i messaggi e allegati da 10 MB http://mail.yahoo.it _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
