]> git.mxchange.org Git - flightgear.git/blobdiff - src/FDM/flight.cxx
Use tiedPropertyLists instead of manually matched tie/untie calls.
[flightgear.git] / src / FDM / flight.cxx
index 37cb97689f5d6d6641a183b071a6d80d5be35998..458320257ac2865386b58fcedebc1a607e5f0851 100644 (file)
@@ -44,23 +44,13 @@ static inline void assign(double* ptr, const SGVec3d& vec)
   ptr[2] = vec[2];
 }
 
-// base_fdm_state is the internal state that is updated in integer
-// multiples of "dt".  This leads to "jitter" with respect to the real
-// world time, so we introduce cur_fdm_state which is extrapolated by
-// the difference between sim time and real world time
-
-FGInterface *cur_fdm_state = 0;
-FGInterface base_fdm_state;
-
 // Constructor
 FGInterface::FGInterface()
-  : remainder(0)
 {
     _setup();
 }
 
 FGInterface::FGInterface( double dt )
-  : remainder(0)
 {
     _setup();
 }
@@ -70,33 +60,18 @@ FGInterface::~FGInterface() {
     // unbind();                   // FIXME: should be called explicitly
 }
 
-
 int
 FGInterface::_calc_multiloop (double dt)
 {
+  // Since some time the simulation time increments we get here are
+  // already a multiple of the basic update freqency.
+  // So, there is no need to do our own multiloop rounding with all bad
+  // roundoff problems when we already have nearly accurate values.
+  // Only the speedup thing must be still handled here
   int hz = fgGetInt("/sim/model-hz");
+  int multiloop = SGMiscd::roundToInt(dt*hz);
   int speedup = fgGetInt("/sim/speed-up");
-
-  dt += remainder;
-  remainder = 0;
-  double ml = dt * hz;
-  // Avoid roundoff problems by adding the roundoff itself.
-  // ... ok, two times the roundoff to have enough room.
-  int multiloop = int(floor(ml * (1.0 + 2.0*DBL_EPSILON)));
-  remainder = (ml - multiloop) / hz;
-
-  // If we artificially inflate ml above by a tiny amount to get the
-  // closest integer, then subtract the integer from the original
-  // slightly smaller value, we can get a negative remainder.
-  // Logically this should never happen, and we definitely don't want
-  // to carry a negative remainder over to the next iteration, so
-  // never let the remainder go below zero.
-  // 
-  // Note: this fixes a problem where we run 1, 3, 1, 3, 1, 3... loops
-  // of the FDM when in fact we want to run 2, 2, 2, 2, 2...
-  if ( remainder < 0 ) { remainder = 0; }
-
-  return (multiloop * speedup);
+  return multiloop * speedup;
 }
 
 
@@ -143,6 +118,7 @@ FGInterface::_setup ()
     runway_altitude=0;
     climb_rate=0;
     altitude_agl=0;
+    track=0;
 }
 
 void
@@ -163,8 +139,7 @@ FGInterface::common_init ()
 
     set_inited( true );
 
-//     stamp();
-//     set_remainder( 0 );
+    ground_cache.set_cache_time_offset(globals->get_sim_time_sec());
 
     // Set initial position
     SG_LOG( SG_FLIGHT, SG_INFO, "...initializing position..." );
@@ -204,6 +179,15 @@ FGInterface::common_init ()
     double slr = SGGeodesy::SGGeodToSeaLevelRadius(geodetic_position_v);
     _set_Sea_level_radius( slr * SG_METER_TO_FEET );
 
+    // Set initial Euler angles
+    SG_LOG( SG_FLIGHT, SG_INFO, "...initializing Euler angles..." );
+    set_Euler_Angles( fgGetDouble("/sim/presets/roll-deg")
+                        * SGD_DEGREES_TO_RADIANS,
+                      fgGetDouble("/sim/presets/pitch-deg")
+                        * SGD_DEGREES_TO_RADIANS,
+                      fgGetDouble("/sim/presets/heading-deg")
+                        * SGD_DEGREES_TO_RADIANS );
+
     // Set initial velocities
     SG_LOG( SG_FLIGHT, SG_INFO, "...initializing velocities..." );
     if ( !fgHasNode("/sim/presets/speed-set") ) {
@@ -232,14 +216,11 @@ FGInterface::common_init ()
         }
     }
 
-    // Set initial Euler angles
-    SG_LOG( SG_FLIGHT, SG_INFO, "...initializing Euler angles..." );
-    set_Euler_Angles( fgGetDouble("/sim/presets/roll-deg")
-                        * SGD_DEGREES_TO_RADIANS,
-                      fgGetDouble("/sim/presets/pitch-deg")
-                        * SGD_DEGREES_TO_RADIANS,
-                      fgGetDouble("/sim/presets/heading-deg")
-                        * SGD_DEGREES_TO_RADIANS );
+    if ( fgHasNode("/sim/presets/glideslope-deg") )
+        set_Gamma_vert_rad( fgGetDouble("/sim/presets/glideslope-deg")
+                              * SGD_DEGREES_TO_RADIANS );
+    else if ( fgHasNode( "/velocities/vertical-speed-fps") )
+        set_Climb_Rate( fgGetDouble("/velocities/vertical-speed-fps") );
 
     SG_LOG( SG_FLIGHT, SG_INFO, "End common FDM init" );
 }
@@ -259,160 +240,174 @@ FGInterface::bind ()
 {
   bound = true;
 
-                                // Time management (read-only)
-//   fgTie("/fdm/time/delta_t", this,
-//         &FGInterface::get_delta_t); // read-only
-//   fgTie("/fdm/time/elapsed", this,
-//         &FGInterface::get_elapsed); // read-only
-//   fgTie("/fdm/time/remainder", this,
-//         &FGInterface::get_remainder); // read-only
-//   fgTie("/fdm/time/multi_loop", this,
-//         &FGInterface::get_multi_loop); // read-only
-
-                       // Aircraft position
-  fgTie("/position/latitude-deg", this,
-        &FGInterface::get_Latitude_deg,
-        &FGInterface::set_Latitude_deg,
-        false);
+  _tiedProperties.setRoot(globals->get_props());
+  // Aircraft position
+  _tiedProperties.Tie("/position/latitude-deg", this,
+                      &FGInterface::get_Latitude_deg,
+                      &FGInterface::set_Latitude_deg,
+                      false);
   fgSetArchivable("/position/latitude-deg");
-  fgTie("/position/longitude-deg", this,
-        &FGInterface::get_Longitude_deg,
-        &FGInterface::set_Longitude_deg,
-        false);
+  _tiedProperties.Tie("/position/longitude-deg", this,
+                      &FGInterface::get_Longitude_deg,
+                      &FGInterface::set_Longitude_deg,
+                      false);
   fgSetArchivable("/position/longitude-deg");
-  fgTie("/position/altitude-ft", this,
-        &FGInterface::get_Altitude,
-        &FGInterface::set_Altitude,
-        false);
+  _tiedProperties.Tie("/position/altitude-ft", this,
+                      &FGInterface::get_Altitude,
+                      &FGInterface::set_Altitude,
+                      false);
   fgSetArchivable("/position/altitude-ft");
-  fgTie("/position/altitude-agl-ft", this,
-        &FGInterface::get_Altitude_AGL); // read-only
+  _tiedProperties.Tie("/position/altitude-agl-ft", this,
+                      &FGInterface::get_Altitude_AGL, &FGInterface::set_AltitudeAGL, false);
   fgSetArchivable("/position/ground-elev-ft");
-  fgTie("/position/ground-elev-ft", this,
-        &FGInterface::get_Runway_altitude); // read-only
+  _tiedProperties.Tie("/position/ground-elev-ft", this,
+                      &FGInterface::get_Runway_altitude); // read-only
   fgSetArchivable("/position/ground-elev-m");
-  fgTie("/position/ground-elev-m", this,
-        &FGInterface::get_Runway_altitude_m); // read-only
-  fgTie("/environment/ground-elevation-m", this,
-        &FGInterface::get_Runway_altitude_m); // read-only
+  _tiedProperties.Tie("/position/ground-elev-m", this,
+                      &FGInterface::get_Runway_altitude_m); // read-only
+  _tiedProperties.Tie("/environment/ground-elevation-m", this,
+                      &FGInterface::get_Runway_altitude_m); // read-only
   fgSetArchivable("/position/sea-level-radius-ft");
-  fgTie("/position/sea-level-radius-ft", this,
-        &FGInterface::get_Sea_level_radius); // read-only
-
-                               // Orientation
-  fgTie("/orientation/roll-deg", this,
-       &FGInterface::get_Phi_deg,
-       &FGInterface::set_Phi_deg);
+  _tiedProperties.Tie("/position/sea-level-radius-ft", this,
+                      &FGInterface::get_Sea_level_radius,
+                      &FGInterface::_set_Sea_level_radius, false);
+
+  // Orientation
+  _tiedProperties.Tie("/orientation/roll-deg", this,
+                      &FGInterface::get_Phi_deg,
+                      &FGInterface::set_Phi_deg, false);
   fgSetArchivable("/orientation/roll-deg");
-  fgTie("/orientation/pitch-deg", this,
-       &FGInterface::get_Theta_deg,
-       &FGInterface::set_Theta_deg);
+  _tiedProperties.Tie("/orientation/pitch-deg", this,
+                      &FGInterface::get_Theta_deg,
+                      &FGInterface::set_Theta_deg, false);
   fgSetArchivable("/orientation/pitch-deg");
-  fgTie("/orientation/heading-deg", this,
-       &FGInterface::get_Psi_deg,
-       &FGInterface::set_Psi_deg);
+  _tiedProperties.Tie("/orientation/heading-deg", this,
+                      &FGInterface::get_Psi_deg,
+                      &FGInterface::set_Psi_deg, false);
   fgSetArchivable("/orientation/heading-deg");
+  _tiedProperties.Tie("/orientation/track-deg", this,
+                      &FGInterface::get_Track); // read-only
 
   // Body-axis "euler rates" (rotation speed, but in a funny
   // representation).
-  fgTie("/orientation/roll-rate-degps", this,
-       &FGInterface::get_Phi_dot_degps);
-  fgTie("/orientation/pitch-rate-degps", this,
-       &FGInterface::get_Theta_dot_degps);
-  fgTie("/orientation/yaw-rate-degps", this,
-       &FGInterface::get_Psi_dot_degps);
-
-                                // Ground speed knots
-  fgTie("/velocities/groundspeed-kt", this,
-        &FGInterface::get_V_ground_speed_kt);
-
-                               // Calibrated airspeed
-  fgTie("/velocities/airspeed-kt", this,
-       &FGInterface::get_V_calibrated_kts,
-       &FGInterface::set_V_calibrated_kts,
-       false);
-
-                               // Mach number
-  fgTie("/velocities/mach", this,
-       &FGInterface::get_Mach_number,
-       &FGInterface::set_Mach_number,
-       false);
-
-                               // Local velocities
-//   fgTie("/velocities/speed-north-fps", this,
-//     &FGInterface::get_V_north,
-//     &FGInterface::set_V_north);
+  _tiedProperties.Tie("/orientation/roll-rate-degps", this,
+                      &FGInterface::get_Phi_dot_degps,
+                      &FGInterface::set_Phi_dot_degps, false);
+  _tiedProperties.Tie("/orientation/pitch-rate-degps", this,
+                      &FGInterface::get_Theta_dot_degps,
+                      &FGInterface::set_Theta_dot_degps, false);
+  _tiedProperties.Tie("/orientation/yaw-rate-degps", this,
+                      &FGInterface::get_Psi_dot_degps,
+                      &FGInterface::set_Psi_dot_degps, false);
+
+  _tiedProperties.Tie("/orientation/p-body", this, &FGInterface::get_P_body); // read-only
+  _tiedProperties.Tie("/orientation/q-body", this, &FGInterface::get_Q_body); // read-only
+  _tiedProperties.Tie("/orientation/r-body", this, &FGInterface::get_R_body); // read-only
+
+  // Ground speed knots
+  _tiedProperties.Tie("/velocities/groundspeed-kt", this,
+                      &FGInterface::get_V_ground_speed_kt,
+                      &FGInterface::set_V_ground_speed_kt); // read-only
+
+  // Calibrated airspeed
+  _tiedProperties.Tie("/velocities/airspeed-kt", this,
+                      &FGInterface::get_V_calibrated_kts,
+                      &FGInterface::set_V_calibrated_kts,
+                      false);
+
+  _tiedProperties.Tie("/velocities/equivalent-kt", this,
+                      &FGInterface::get_V_equiv_kts); // read-only
+
+  // Mach number
+  _tiedProperties.Tie("/velocities/mach", this,
+                      &FGInterface::get_Mach_number,
+                      &FGInterface::set_Mach_number,
+                      false);
+
+  // Local velocities
+//   _tiedProperties.Tie("/velocities/speed-north-fps", this,
+//                       &FGInterface::get_V_north,
+//                       &FGInterface::set_V_north);
 //   fgSetArchivable("/velocities/speed-north-fps");
-//   fgTie("/velocities/speed-east-fps", this,
-//     &FGInterface::get_V_east,
-//     &FGInterface::set_V_east);
+//   _tiedProperties.Tie("/velocities/speed-east-fps", this,
+//                       &FGInterface::get_V_east,
+//                       &FGInterface::set_V_east);
 //   fgSetArchivable("/velocities/speed-east-fps");
-//   fgTie("/velocities/speed-down-fps", this,
-//     &FGInterface::get_V_down,
-//     &FGInterface::set_V_down);
+//   _tiedProperties.Tie("/velocities/speed-down-fps", this,
+//                       &FGInterface::get_V_down,
+//                       &FGInterface::set_V_down);
 //   fgSetArchivable("/velocities/speed-down-fps");
-                               // FIXME: Temporarily read-only, until the
-                               // incompatibilities between JSBSim and
-                               // LaRCSim are fixed (LaRCSim adds the
-                               // earth's rotation to the east velocity).
-  fgTie("/velocities/speed-north-fps", this,
-       &FGInterface::get_V_north);
-  fgTie("/velocities/speed-east-fps", this,
-       &FGInterface::get_V_east);
-  fgTie("/velocities/speed-down-fps", this,
-       &FGInterface::get_V_down);
-
-                               // Relative wind
-                               // FIXME: temporarily archivable, until
-                               // the NED problem is fixed.
-  fgTie("/velocities/uBody-fps", this,
-       &FGInterface::get_uBody,
-       &FGInterface::set_uBody,
-       false);
+
+  // FIXME: Temporarily read-only, until the
+  // incompatibilities between JSBSim and
+  // LaRCSim are fixed (LaRCSim adds the
+  // earth's rotation to the east velocity).
+  _tiedProperties.Tie("/velocities/speed-north-fps", this,
+                      &FGInterface::get_V_north, &FGInterface::set_V_north, false);
+  _tiedProperties.Tie("/velocities/speed-east-fps", this,
+                      &FGInterface::get_V_east, &FGInterface::set_V_east, false);
+  _tiedProperties.Tie("/velocities/speed-down-fps", this,
+                      &FGInterface::get_V_down, &FGInterface::set_V_down, false);
+
+  _tiedProperties.Tie("/velocities/north-relground-fps", this,
+                      &FGInterface::get_V_north_rel_ground); // read-only
+  _tiedProperties.Tie("/velocities/east-relground-fps", this,
+                      &FGInterface::get_V_east_rel_ground); // read-only
+  _tiedProperties.Tie("/velocities/down-relground-fps", this,
+                      &FGInterface::get_V_down_rel_ground); // read-only
+
+  // Relative wind
+  // FIXME: temporarily archivable, until the NED problem is fixed.
+  _tiedProperties.Tie("/velocities/uBody-fps", this,
+                      &FGInterface::get_uBody,
+                      &FGInterface::set_uBody,
+                      false);
   fgSetArchivable("/velocities/uBody-fps");
-  fgTie("/velocities/vBody-fps", this,
-       &FGInterface::get_vBody,
-       &FGInterface::set_vBody,
-       false);
+  _tiedProperties.Tie("/velocities/vBody-fps", this,
+                      &FGInterface::get_vBody,
+                      &FGInterface::set_vBody,
+                      false);
   fgSetArchivable("/velocities/vBody-fps");
-  fgTie("/velocities/wBody-fps", this,
-       &FGInterface::get_wBody,
-       &FGInterface::set_wBody,
-       false);
+  _tiedProperties.Tie("/velocities/wBody-fps", this,
+                      &FGInterface::get_wBody,
+                      &FGInterface::set_wBody,
+                      false);
   fgSetArchivable("/velocities/wBody-fps");
 
-                               // Climb and slip (read-only)
-  fgTie("/velocities/vertical-speed-fps", this,
-       &FGInterface::get_Climb_Rate,
-  &FGInterface::set_Climb_Rate ); 
-  fgTie("/velocities/glideslope", this,
-  &FGInterface::get_Gamma_vert_rad,
-  &FGInterface::set_Gamma_vert_rad );
-  fgTie("/orientation/side-slip-rad", this,
-       &FGInterface::get_Beta); // read-only
-  fgTie("/orientation/side-slip-deg", this,
-  &FGInterface::get_Beta_deg); // read-only
-  fgTie("/orientation/alpha-deg", this,
-  &FGInterface::get_Alpha_deg); // read-only
-  fgTie("/accelerations/nlf", this,
-  &FGInterface::get_Nlf); // read-only
-
-                                // NED accelerations
-  fgTie("/accelerations/ned/north-accel-fps_sec",
-        this, &FGInterface::get_V_dot_north);
-  fgTie("/accelerations/ned/east-accel-fps_sec",
-        this, &FGInterface::get_V_dot_east);
-  fgTie("/accelerations/ned/down-accel-fps_sec",
-        this, &FGInterface::get_V_dot_down);
-
-                                // Pilot accelerations
-  fgTie("/accelerations/pilot/x-accel-fps_sec",
-        this, &FGInterface::get_A_X_pilot);
-  fgTie("/accelerations/pilot/y-accel-fps_sec",
-        this, &FGInterface::get_A_Y_pilot);
-  fgTie("/accelerations/pilot/z-accel-fps_sec",
-        this, &FGInterface::get_A_Z_pilot);
-
+  // Climb and slip (read-only)
+  _tiedProperties.Tie("/velocities/vertical-speed-fps", this,
+                      &FGInterface::get_Climb_Rate,
+                      &FGInterface::set_Climb_Rate, false );
+  _tiedProperties.Tie("/velocities/glideslope", this,
+                      &FGInterface::get_Gamma_vert_rad,
+                      &FGInterface::set_Gamma_vert_rad, false );
+  _tiedProperties.Tie("/orientation/side-slip-rad", this,
+                      &FGInterface::get_Beta, &FGInterface::_set_Beta, false);
+  _tiedProperties.Tie("/orientation/side-slip-deg", this,
+                      &FGInterface::get_Beta_deg); // read-only
+  _tiedProperties.Tie("/orientation/alpha-deg", this,
+                      &FGInterface::get_Alpha_deg, &FGInterface::set_Alpha_deg, false);
+  _tiedProperties.Tie("/accelerations/nlf", this,
+                      &FGInterface::get_Nlf); // read-only
+
+  // NED accelerations
+  _tiedProperties.Tie("/accelerations/ned/north-accel-fps_sec",
+                      this, &FGInterface::get_V_dot_north); // read-only
+  _tiedProperties.Tie("/accelerations/ned/east-accel-fps_sec",
+                      this, &FGInterface::get_V_dot_east); // read-only
+  _tiedProperties.Tie("/accelerations/ned/down-accel-fps_sec",
+                      this, &FGInterface::get_V_dot_down); // read-only
+
+  // Pilot accelerations
+  _tiedProperties.Tie("/accelerations/pilot/x-accel-fps_sec",
+                      this, &FGInterface::get_A_X_pilot, &FGInterface::set_A_X_pilot, false);
+  _tiedProperties.Tie("/accelerations/pilot/y-accel-fps_sec",
+                      this, &FGInterface::get_A_Y_pilot, &FGInterface::set_A_Y_pilot, false);
+  _tiedProperties.Tie("/accelerations/pilot/z-accel-fps_sec",
+                      this, &FGInterface::get_A_Z_pilot, &FGInterface::set_A_Z_pilot, false);
+
+  _tiedProperties.Tie("/accelerations/n-z-cg-fps_sec",
+                      this, &FGInterface::get_N_Z_cg); // read-only
 }
 
 
@@ -425,47 +420,8 @@ FGInterface::bind ()
 void
 FGInterface::unbind ()
 {
+  _tiedProperties.Untie();
   bound = false;
-
-  // fgUntie("/fdm/time/delta_t");
-  // fgUntie("/fdm/time/elapsed");
-  // fgUntie("/fdm/time/remainder");
-  // fgUntie("/fdm/time/multi_loop");
-  fgUntie("/position/latitude-deg");
-  fgUntie("/position/longitude-deg");
-  fgUntie("/position/altitude-ft");
-  fgUntie("/position/altitude-agl-ft");
-  fgUntie("/position/ground-elev-ft");
-  fgUntie("/position/ground-elev-m");
-  fgUntie("/environment/ground-elevation-m");
-  fgUntie("/position/sea-level-radius-ft");
-  fgUntie("/orientation/roll-deg");
-  fgUntie("/orientation/pitch-deg");
-  fgUntie("/orientation/heading-deg");
-  fgUntie("/orientation/roll-rate-degps");
-  fgUntie("/orientation/pitch-rate-degps");
-  fgUntie("/orientation/yaw-rate-degps");
-  fgUntie("/orientation/side-slip-rad");
-  fgUntie("/orientation/side-slip-deg");
-  fgUntie("/orientation/alpha-deg");
-  fgUntie("/velocities/airspeed-kt");
-  fgUntie("/velocities/groundspeed-kt");
-  fgUntie("/velocities/mach");
-  fgUntie("/velocities/speed-north-fps");
-  fgUntie("/velocities/speed-east-fps");
-  fgUntie("/velocities/speed-down-fps");
-  fgUntie("/velocities/uBody-fps");
-  fgUntie("/velocities/vBody-fps");
-  fgUntie("/velocities/wBody-fps");
-  fgUntie("/velocities/vertical-speed-fps");
-  fgUntie("/velocities/glideslope");
-  fgUntie("/accelerations/nlf");
-  fgUntie("/accelerations/pilot/x-accel-fps_sec");
-  fgUntie("/accelerations/pilot/y-accel-fps_sec");
-  fgUntie("/accelerations/pilot/z-accel-fps_sec");
-  fgUntie("/accelerations/ned/north-accel-fps_sec");
-  fgUntie("/accelerations/ned/east-accel-fps_sec");
-  fgUntie("/accelerations/ned/down-accel-fps_sec");
 }
 
 /**
@@ -480,6 +436,7 @@ FGInterface::update (double dt)
 
 void FGInterface::_updatePositionM(const SGVec3d& cartPos)
 {
+    TrackComputer tracker( track, geodetic_position_v );
     cartesian_position_v = cartPos;
     geodetic_position_v = SGGeod::fromCart(cartesian_position_v);
     geocentric_position_v = SGGeoc::fromCart(cartesian_position_v);
@@ -490,6 +447,7 @@ void FGInterface::_updatePositionM(const SGVec3d& cartPos)
 
 void FGInterface::_updatePosition(const SGGeod& geod)
 {
+    TrackComputer tracker( track, geodetic_position_v );
     geodetic_position_v = geod;
     cartesian_position_v = SGVec3d::fromGeod(geodetic_position_v);
     geocentric_position_v = SGGeoc::fromCart(cartesian_position_v);
@@ -501,6 +459,7 @@ void FGInterface::_updatePosition(const SGGeod& geod)
 
 void FGInterface::_updatePosition(const SGGeoc& geoc)
 {
+    TrackComputer tracker( track, geodetic_position_v );
     geocentric_position_v = geoc;
     cartesian_position_v = SGVec3d::fromGeoc(geocentric_position_v);
     geodetic_position_v = SGGeod::fromCart(cartesian_position_v);
@@ -517,7 +476,7 @@ void FGInterface::_updateGeodeticPosition( double lat, double lon, double alt )
 
 
 void FGInterface::_updateGeocentricPosition( double lat, double lon,
-                                            double alt )
+                                             double alt )
 {
     _updatePosition(SGGeoc::fromRadFt(lon, lat, get_Sea_level_radius() + alt));
 }
@@ -554,16 +513,16 @@ void FGInterface::set_Mach_number(double mach) {
 }
 
 void FGInterface::set_Velocities_Local( double north, 
-                                       double east, 
-                                       double down ){
+                                        double east,
+                                        double down ){
     v_local_v[0] = north;
     v_local_v[1] = east;
     v_local_v[2] = down;
 }
 
 void FGInterface::set_Velocities_Wind_Body( double u, 
-                                           double v, 
-                                           double w){
+                                            double v,
+                                            double w){
     v_wind_body_v[0] = u;
     v_wind_body_v[1] = v;
     v_wind_body_v[2] = w;
@@ -571,11 +530,11 @@ void FGInterface::set_Velocities_Wind_Body( double u,
 
 // Euler angles 
 void FGInterface::set_Euler_Angles( double phi, 
-                                   double theta, 
-                                   double psi ) {
+                                    double theta,
+                                    double psi ) {
     euler_angles_v[0] = phi;
     euler_angles_v[1] = theta;
-    euler_angles_v[2] = psi;                                            
+    euler_angles_v[2] = psi;
 }  
 
 // Flight Path
@@ -592,16 +551,16 @@ void FGInterface::set_Static_temperature(double T) { static_temperature = T; }
 void FGInterface::set_Density(double rho) { density = rho; }
 
 void FGInterface::set_Velocities_Local_Airmass (double wnorth, 
-                                               double weast, 
-                                               double wdown ) {
+                                                double weast,
+                                                double wdown ) {
     v_local_airmass_v[0] = wnorth;
     v_local_airmass_v[1] = weast;
     v_local_airmass_v[2] = wdown;
 }
 
 
-void FGInterface::_busdump(void) {
-
+void FGInterface::_busdump(void)
+{
     SG_LOG(SG_FLIGHT,SG_INFO,"d_cg_rp_body_v: " << d_cg_rp_body_v);
     SG_LOG(SG_FLIGHT,SG_INFO,"v_dot_local_v: " << v_dot_local_v);
     SG_LOG(SG_FLIGHT,SG_INFO,"v_dot_body_v: " << v_dot_body_v);
@@ -643,18 +602,21 @@ void FGInterface::_busdump(void) {
 }
 
 bool
-FGInterface::prepare_ground_cache_m(double ref_time, const double pt[3],
-                                    double rad)
+FGInterface::prepare_ground_cache_m(double startSimTime, double endSimTime,
+                                    const double pt[3], double rad)
 {
-  return ground_cache.prepare_ground_cache(ref_time, SGVec3d(pt), rad);
+  return ground_cache.prepare_ground_cache(startSimTime, endSimTime,
+                                           SGVec3d(pt), rad);
 }
 
-bool FGInterface::prepare_ground_cache_ft(double ref_time, const double pt[3],
-                                          double rad)
+bool
+FGInterface::prepare_ground_cache_ft(double startSimTime, double endSimTime,
+                                     const double pt[3], double rad)
 {
   // Convert units and do the real work.
   SGVec3d pt_ft = SG_FEET_TO_METER*SGVec3d(pt);
-  return ground_cache.prepare_ground_cache(ref_time, pt_ft, rad*SG_FEET_TO_METER);
+  return ground_cache.prepare_ground_cache(startSimTime, endSimTime,
+                                           pt_ft, rad*SG_FEET_TO_METER);
 }
 
 bool
@@ -822,32 +784,37 @@ FGInterface::get_groundlevel_m(const SGGeod& geod)
 
   // FIXME: how to handle t - ref_time differences ???
   SGVec3d cpos;
-  double ref_time, radius;
+  double ref_time = 0, radius;
   // Prepare the ground cache for that position.
   if (!is_valid_m(&ref_time, cpos.data(), &radius)) {
-    bool ok = prepare_ground_cache_m(ref_time, pos.data(), 10);
+    double startTime = ref_time;
+    double endTime = startTime + 1;
+    bool ok = prepare_ground_cache_m(startTime, endTime, pos.data(), 10);
     /// This is most likely the case when the given altitude is
     /// too low, try with a new altitude of 10000m, that should be
     /// sufficient to find a ground level below everywhere on our planet
     if (!ok) {
-      pos = SGVec3d::fromGeod(SGGeod::fromRadM(geod.getLongitudeRad(), geod.getLatitudeRad(), 10000));
+      pos = SGVec3d::fromGeod(SGGeod::fromGeodM(geod, 10000));
       /// If there is still no ground, return sea level radius
-      if (!prepare_ground_cache_m(ref_time, pos.data(), 10))
+      if (!prepare_ground_cache_m(startTime, endTime, pos.data(), 10))
         return 0;
     }
   } else if (radius*radius <= distSqr(pos, cpos)) {
+    double startTime = ref_time;
+    double endTime = startTime + 1;
+
     /// We reuse the old radius value, but only if it is at least 10 Meters ..
     if (!(10 < radius)) // Well this strange compare is nan safe
       radius = 10;
 
-    bool ok = prepare_ground_cache_m(ref_time, pos.data(), radius);
+    bool ok = prepare_ground_cache_m(startTime, endTime, pos.data(), radius);
     /// This is most likely the case when the given altitude is
     /// too low, try with a new altitude of 10000m, that should be
     /// sufficient to find a ground level below everywhere on our planet
     if (!ok) {
-      pos = SGVec3d::fromGeod(SGGeod::fromRadM(geod.getLongitudeRad(), geod.getLatitudeRad(), 10000));
+      pos = SGVec3d::fromGeod(SGGeod::fromGeodM(geod, 10000));
       /// If there is still no ground, return sea level radius
-      if (!prepare_ground_cache_m(ref_time, pos.data(), radius))
+      if (!prepare_ground_cache_m(startTime, endTime, pos.data(), radius))
         return 0;
     }
   }
@@ -916,6 +883,3 @@ FGInterface::release_wire(void)
   ground_cache.release_wire();
 }
 
-void fgToggleFDMdataLogging(void) {
-  cur_fdm_state->ToggleDataLogging();
-}