The existence of the property that is used for <table> independent vars is now checked during execution rather than when the XML definition is parsed. This relaxes the order in which filters, table and more generally flight controls need to be declared in the XML definition files.
E.g. fgaddon/Aircraft/Icaro_MRX13/Icaro_Laminar_13_MRX-set.xml sets
/sim/current-view/view-number to 9.
It seems that recent View changes broke this, but this fix is in unchanged
code.
Prior to the recent multiplayer view changes, /sim/current-view/?-offset-m
contained the current view's offsets from /sim/view[]/config/?-offset-m. The
multiplayer view changes modified things to set /sim/current-view/?-offset-m
to zeros, and instead use /sim/view[]/config/?-offset-m. This was so
that multiplayer views could be implemented simply by prefixing with
/ai/models/multiplayer[]/set/ to get the right offsets.
We still added in /sim/current-view/?-offset-m, but these were usually zero.
However some aircraft write to /sim/current-view/?-offset-m, and assume that
values must include the /sim/view[]/config/?-offset-m. E.g. the spaceshuttle
does this in order to simulate SRB shaking. This results in the offset being
included twice, which breaks things.
So this commit restores the original handling of /sim/current-view/?-offset-m
by doing an additional subtraction of /sim/view[]/config/?-offset-m. It also
avoids resetting /sim/current-view/?-offset-m to zeros when the view changes.
This results in views working for user aircraft, user aircraft that do custom
view handling, and multiplayer aircraft.
- [Backward compatibility breakage] Gyros are now measuring rotation rates instead of rotational accelerations. Gyros that measure rotational accelerations do not exist in the real world.
- Output properties of flight control elements are no longer tied. This saves a lot of spurious warning messages and allows direct references of the same properties among several flight controls.
- Water vapor in the atmosphere is now managed through its mass fraction rather than its partial pressure. The former being the physical quantity that is conserved when pressure and temperature vary.
- Check that there are at least 3 contacts before trying to trim on ground.
- ECEF to ECI frame conversion has been moved from FGLocation to FGPropagate and FGInitialConditions since not all FGLocation need to manage that.
- Gravity computations have been moved to FGInertial because it is where all the constants to compute gravity are stored. This reduces the amount of data transmitted between FGInertial and FGAccelerations.
- Added optional transmission of the simulation time for FG UDP interface
- Code cleanup and use more C++11 idioms (override, constexpr, range-based for loop, etc.)
We now keep the aircraft in view when zooming, sacrificing the view of the
ground. I.e. we move the bottom of the view upwards, while keeping the top of
the view unchanged.
Recent changes to ViewPropertyEvaluator mean that
ViewPropertyEvaluator::getDoubleValue() doesn't handle default values very
well, so we were ending up with chase-distance of zero, not the default -25,
leading to over-zooming.
Un-caching of scenery appears to happen fairly often, and means that we fail
to find height of ground under aircraft, so we now go back to the last found
value instead of using zero.
This allows Tower View etc to use nearest tower when vewing remote multiplayer
aircraft.
Also force an update of nearest airport whenever multiplayer view changes, to
reduce delay before Tower View works.
SGVec3d's default constructor leaves the fields uninitialised, which seems to
sometimes break fg with lots of NaN-related diagnostics.
The fix is to use SGVec3d::zeros() instead.
Also call resetOffsetsAndFOV() from the View::View() constructor, to ensure
that things are set up consistently.
View 8 used to be new Tower View AGL view, but this interfered with hard-coded
aircraft view numbers. So fgdata now has removed Model View, meaning Tower
View AGL uses Model View's old number (7), which keeps sequential view numbers
unchanged.
