On Mar 31, 2011, at 11:01 AM, Robert wrote: > Hi everyone, > > I'd like to share some thoughts with you on how we can improve the replay > system. > Right now only the last minute is recorded at full precision. After that > minute we get a precision of 1 fps. And after 10 minutes we get a precision > of 1 frame per 10 seconds (please correct me. this number may be wrong). > Due to linear interpolation the motion of the plane become jagged (hope you > understand what I mean here). > Also due to the loss of precision fast rotations of the plane look just > incorrect in the replays (reversed direction of the rotation). > > FIRST SOLUTION: > Streaming the replay data to the hard disc drive always at full precision. > This is probably the best solution as: > We don't need much RAM to save a whole flight (we just need a stream buffer). > We get full precision. > We solve the reversed rotaton problem. > We still should use linear interpolation here as it is faster than monotone > hermite spline: > > SECOND SOLUTION: > To solve the jagged motion problem I thought of implementing another > interpolator. > The monotone Hermite spline interpolator. It has the benefits that it does > not oscillate in comparison to the Catmull Rom interpolator. > The downside to this solution is that the problem of incorrect (reversed) > rotation cannot be solved. > Also we will need to feed the hermite spline interpolator with 4 replay > frames instead of 2 used in the linear interpolator. > > > p.s. I also thought that it woud be nice if the nearest tower would be > automatically computed in replays (as it is done in x-plane), so you don't > have to enter the airport code every time. > > What do you think? >
Just as additional info, this was how the precision was explained to me last year : http://sourceforge.net/mailarchive/message.php?msg_id=24790011 ------------------------------------------------------------------------------ Create and publish websites with WebMatrix Use the most popular FREE web apps or write code yourself; WebMatrix provides all the features you need to develop and publish your website. http://p.sf.net/sfu/ms-webmatrix-sf _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
