Fix scenery reload issues.

Aircraft could fall through the ground on scenery reload. Properly reset
the "sceneryloaded" flag to pause FDM processing while scenery is being
reloaded. Also stop processing some instruments while scenery is reloaded.

src/Instrumentation/agradar.cxx

@@ -102,13 +102,8 @@ agRadar::init ()
 void
 agRadar::update (double delta_time_sec)
 {
-    if ( ! _sim_init_done ) {
-
-        if ( ! fgGetBool("sim/sceneryloaded", false) )
-            return;
-
-        _sim_init_done = true;
-    }
+    if (!_sceneryLoaded->getBoolValue())
+        return;
 
     if ( !_odg || ! _serviceable_node->getBoolValue() ) {
         _Instrument->setStringValue("status","");
@@ -122,7 +117,6 @@ agRadar::update (double delta_time_sec)
 
     _time = 0.0;
 
-   
     update_terrain();
 //    wxRadarBg::update(delta_time_sec);
 }

src/Instrumentation/rad_alt.cxx

@@ -97,13 +97,8 @@ radAlt::init ()
 void
 radAlt::update (double delta_time_sec)
 {
-    if ( ! _sim_init_done ) {
-
-        if ( ! fgGetBool("sim/sceneryloaded", false) )
-            return;
-
-        _sim_init_done = true;
-    }
+    if (!_sceneryLoaded->getBoolValue())
+        return;
 
     if ( !_odg || ! _serviceable_node->getBoolValue() ) {
         _Instrument->setStringValue("status","");
@@ -111,16 +106,14 @@ radAlt::update (double delta_time_sec)
     }
 
     _time += delta_time_sec;
-
     if (_time < _interval)
         return;
 
     _time = 0.0;
+
     update_altitude();
 }
 
-
-
 double
 radAlt::getDistanceAntennaToHit(SGVec3d nearestHit) const 
 {

src/Instrumentation/wxradar.cxx

@@ -77,7 +77,6 @@ wxRadarBg::wxRadarBg(SGPropertyNode *node) :
     _interval(node->getDoubleValue("update-interval-sec", 1.0)),
     _elapsed_time(0),
     _persistance(0),
-    _sim_init_done(false),
     _odg(0),
     _range_nm(0),
     _scale(0),
@@ -127,6 +126,7 @@ void
 wxRadarBg::init ()
 {
     _serviceable_node = _Instrument->getNode("serviceable", true);
+    _sceneryLoaded = fgGetNode("/sim/sceneryloaded", true);
 
     // texture name to use in 2D and 3D instruments
     _texture_path = _Instrument->getStringValue("radar-texture-path",
@@ -287,22 +287,17 @@ osg::Matrixf wxRotate(float angle)
 void
 wxRadarBg::update (double delta_time_sec)
 {
-    if (!_sim_init_done) {
-        if (!fgGetBool("sim/sceneryloaded", false))
-            return;
+    if (!_sceneryLoaded->getBoolValue())
+        return;
 
-        _sim_init_done = true;
-    }
     if (!_odg || !_serviceable_node->getBoolValue()) {
         _Instrument->setStringValue("status", "");
         return;
     }
+
     _time += delta_time_sec;
-    if (_time < _interval){
-//        cout << "WXradar update too soon " << _time << endl;
+    if (_time < _interval)
         return;
-    }
-//        cout << "WXradar updating" << _time<< endl;
 
     _time = 0.0;
 

src/Instrumentation/wxradar.hxx

@@ -57,9 +57,9 @@ protected:
     double _interval;
     double _elapsed_time;
     double _persistance;
-    bool _sim_init_done;
 
     SGPropertyNode_ptr _serviceable_node;
+    SGPropertyNode_ptr _sceneryLoaded;
     SGPropertyNode_ptr _Instrument;
     SGPropertyNode_ptr _radar_mode_control_node;
 

src/Main/renderer.cxx

@@ -1612,8 +1612,8 @@ FGRenderer::update( ) {
     if (_splash_alpha->getDoubleValue()>0.0)
     {
         // Fade out the splash screen
-        const double fade_time = 0.8;
-        const double fade_steps_per_sec = 20;
+        const double fade_time = 0.5;
+        const double fade_steps_per_sec = 10;
         double delay_time = SGMiscd::min(fade_time/fade_steps_per_sec,
                                          (SGTimeStamp::now() - _splash_time).toSecs());
         _splash_time = SGTimeStamp::now();

src/Scenery/tilemgr.cxx

@@ -101,6 +101,11 @@ void FGTileMgr::refresh_tile(void* tileMgr, long tileIndex)
 
 void FGTileMgr::reinit()
 {
+    // reset flag, stop FDM processing, otherwise aircraft fall through
+    // the ground while reloading scenery
+    fgSetBool("/sim/sceneryloaded",false);
+    fgSetDouble("/sim/startup/splash-alpha", 1.0);
+
     // remove all old scenery nodes from scenegraph and clear cache
     osg::Group* group = globals->get_scenery()->get_terrain_branch();
     group->removeChildren(0, group->getNumChildren());