jean pellotier a écrit :
hi, yesterday we were near the Kilimanjaro (HTKJ) and up to reach the
top with a c172, we tried to use the lift given by ridge lift, but it
was always 0.
I tried to start at Quito (SEQU) and ridge lift get elevation values
only once in north hemisphere.
it seems that:
(globals->get_scenery()->get_elevation_m(SGGeod::fromGeodM(
SGGeod::fromRad(probe_lon_rad[i],probe_lat_rad[i]),
20000), elevation, 0))
in environment/ridge_lift.cxx is always false in south hemisphere, an
can't report the ground elevation
The responsable was the test for the pole position, to avoid a division
by cos(lat) =0, here's a patch addressing this issue, if someone can
have a look and commit, thanks.
jano
Index: src/Environment/ridge_lift.cxx
===================================================================
RCS file: /var/cvs/FlightGear-0.9/source/src/Environment/ridge_lift.cxx,v
retrieving revision 1.8
diff -u -r1.8 ridge_lift.cxx
--- src/Environment/ridge_lift.cxx 20 May 2009 09:24:56 -0000 1.8
+++ src/Environment/ridge_lift.cxx 23 May 2009 06:47:58 -0000
@@ -176,7 +176,7 @@
probe_lat_rad[i] = asin(sin(user_latitude_rad)*cos(probe_radius_ratio)
+cos(user_latitude_rad)*sin_probe_radius_ratio*cos(ground_wind_from_rad));
- if (probe_lat_rad[i] < SG_EPSILON ) {
+ if (abs(abs(probe_lat_rad[i]) - SG_PI / 2.0) < SG_EPSILON ) {
probe_lon_rad[i] = user_latitude_rad; // probe on a pole
} else {
probe_lon_rad[i] = fmod((user_longitude_rad+asin(sin(ground_wind_from_rad)
@@ -191,11 +191,7 @@
double elevation = 0;
if (globals->get_scenery()->get_elevation_m(SGGeod::fromGeodM(
SGGeod::fromRad(probe_lon_rad[i],probe_lat_rad[i]), 20000), elevation, 0)) {
- if ( elevation > 0.1 ) {
probe_elev_m[i] = elevation;
- } else {
- probe_elev_m[i] = 0.1 ;
- }
} else {
probe_elev_m[i] = 0.1;
}
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