Hi, Once 2.10 has branched (i.e, in a month!) I'm going to make a consistency change to a simulation variable: namely to change the body (UVW) accelerations JSBsim exposes to FlightGear, to come from a slightly different source (FGAccelerations::GetUVWdot instead of FGAccelerations::GetBodyAccelerations).
This is because the later includes gravity and some other terms (centripetal acceleration, I'm guessing, but I'm not an expert) which the YASim equivalents do not. I'm also going to expose the values via new properties under /accelerations/body/foo-accel-fps_sec, for both JSBSim and YASim. This will enable standard simulation of inertial acceleration based instruments, which I want to play around with. Because of the current discrepancy between JSBSim and YASim, the body accelerations are currently *not* exposed in any standard location (JSBSim exposes them in its private property tree), and code is avoiding using them: for example: (from the multiplayer code!) // accels, set that to zero for now. // Angular accelerations are missing from the interface anyway, // linear accelerations are screwed up at least for JSBSim. // motionInfo.linearAccel = SG_FEET_TO_METER*SGVec3f(ifce.get_U_dot_body(), ifce.get_V_dot_body(), ifce.get_W_dot_body()); The JSBSim values aren't screwed up, I think, just including other non-inertial terms which YASim does not. Since it's the inertial accelerations I want to sense in the instruments, that's why I will tweak the JSBSim<->FGFS interface and not YASim. Any comments or observations on this, please let me know. As I said it's all only relevant for 2.12 - I won't make any changes until after we branch for 2.10. James ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
