> >> Only JSBSim doesn't. :-(
While we're finding out the cause and fixing the ground cache thing, how about
making a small modification to JSBSim.cxx that will spit out useful data and
*not* freeze the FDM? (about line 409)
// Compute the potential movement of this aircraft and query for the
// ground in this area.
double groundCacheRadius = acrad + 2*dt*Propagate->GetUVW().Magnitude();
double alt, slr, lat, lon;
FGColumnVector3 cart = Auxiliary->GetLocationVRP();
if ( needTrim && startup_trim->getBoolValue() ) {
alt = fgic->GetAltitudeFtIC();
slr = fgic->GetSeaLevelRadiusFtIC();
lat = fgic->GetLatitudeDegIC() * SGD_DEGREES_TO_RADIANS;
lon = fgic->GetLongitudeDegIC() * SGD_DEGREES_TO_RADIANS;
cart = FGLocation(lon, lat, alt+slr);
}
double cart_pos[3] = { cart(1), cart(2), cart(3) };
bool cache_ok = prepare_ground_cache_ft( State->Getsim_time(), cart_pos,
groundCacheRadius );
if (!cache_ok) {
SG_LOG(SG_FLIGHT, SG_WARN,
"FGInterface is being called without scenery below the aircraft!
\n");
cout << "altitude = " << alt << endl;
cout << "sea level radius = " << slr << endl;
cout << "latitude = " << lat << endl;
cout << "longitude = " << lon << endl;
//return;
}
I know it works fine in the air (I've been using it for a couple days while
trying to recreate the error conditions), but what happens if you get a bad
cache on the ground? Don't know.
Dave
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