From: "Christian Mayer" <[EMAIL PROTECTED]> > Norman Vine wrote: > > Andy Ross writes: > > >But note that there is lots of opportunity for compression here; it's > > >just that dumb general-purpose algorithms like "zip" are unable to > > >find them for a single packet. A few ideas that occur to me: > > > > > >+ Position needn't send three full 64 bit doubles, since the position > > > will always be "near" the last one. Sending deltas will work (if > > > you are careful to handle potential bugs like successive round-off > > > errors), as will (reliably!) transmitting a "zone" coordinate every > > > so often and sending packets as deltas from that. If the updates > > > are always within ~100m of the last position, you can get each > > > position coordinate down to 15 bits or so and still achieve > > > millimeter precision. > > > > Yup.. using deltas should be a big win > > Yes, but make sure that you deal with the precision loss smoothly. > > E.g. x-Position (in base 10), every 10 steps you'll transmit the real > position and no delta: > > data data > Source to transmit: transmitted: result: > 1. 100.00 100.00 100.0 100.00
And what happens with deltas and positions when you will lose UDP packets ? How will you restore the correct position or orientation ? Perhaps, from time to time, it will be good to send absolute positions to resynch. -Fred _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
