Mathias Fröhlich:

Jon Stockill wrote:
> I've just discovered that when using the null fdm I'm not getting
> updates to /position/ground-elev-m any more. So I can't actually
> retrieve the terrain elevation. Is there somewhere else in the property
> tree I could read this from?

The attached patch fixes this problem.

diff --git a/src/FDM/NullFDM.cxx b/src/FDM/NullFDM.cxx
index d290d6eb06dbaaf74cf9ed4d2ccd6aaf8ff41171..5589c4490a79c083e8fc16f056774283eb2fe9ee 100644 (file)
--- a/src/FDM/NullFDM.cxx
+++ b/src/FDM/NullFDM.cxx
@@ -40,6 +40,8 @@ FGNullFDM::~FGNullFDM() {
 // Initialize the NullFDM flight model, dt is the time increment
 // for each subsequent iteration through the EOM
 void FGNullFDM::init() {
+    //do init common to all the FDM's          
+    common_init();
     // cout << "FGNullFDM::init()" << endl;
     set_inited( true );
 }
@@ -50,4 +52,6 @@ void FGNullFDM::init() {
 // external source.)
 void FGNullFDM::update( double dt ) {
     // cout << "FGNullFDM::update()" << endl;
+    // That is just to trigger ground level computations
+    _updateGeodeticPosition(get_Latitude(), get_Longitude(), get_Altitude());
 }