Hi Erik, Erik Hofman schrieb am 23.10.2008 18:47: > Vladimir Karmishin wrote: > > >> I need any thoughts, >> imaginations about which way can it be modified to let it work with >> multiple 3d sound emitters. >> > > Reading this again there might be some confusion; aircraft can have > multiple 3d sound emitters already, they are just tied to the main > aircraft right now (and the listener is always facing the main model, > this is probably why doppler doesn't function too well). > > no. The Doppler problems are due to OpenAL bugs and limitations. On most systems (at least at all which are using Open AL software Doppler calculation) I got strange effects. On Linux systems a workaround was to use only the relative velocity of listener and sound, which is physically not correct. But on windows even this approach results is strange effects. There I use my own software implementation in simgear and pass the calculated pitch and volume to Open AL. But Open AL clamps the pitch factor (If I remember correctly to 0.5 ... 2), and additionally many aircrafts modify the pitch by them self. This limits the Doppler effect in Flightgear.
Melchior sent me a note, that actual Open AL might be less buggy, but he still noticed strange effects. > But you can already define the position an direction of each sound effect. > Yes, and many aircrafts make use of this, e. g. the S58 or the Bo105. > The remaining problem is to make the AI models also emit sound effects. > > Erik > > Maik ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
