Well I'm not sure exactly what the problem is. To say the least getting into
some of this code isn't very easy.
Here's a patch that forces a single update after the FDM initializes.
Actually I think what this does is just delay the lighting update until the
second frame, since as far as I can tell the FDM isn't updated on the first
pass through MainLoop. It does appear that the FDM update is critical to
getting a good result from fgUpdateSkyAndLightingParams().
If anyone is interested below the patch is a log for two successive calls to
the lighting update one each of during processing of frames 1 and 2. Note
that there is a huge jump in the Sun position between the first and second frame.
Best,
Jim
Index: main.cxx
===================================================================
RCS file: /var/cvs/FlightGear-0.9/FlightGear/src/Main/main.cxx,v
retrieving revision 1.129
diff -u -r1.129 main.cxx
--- main.cxx 17 Sep 2003 10:02:36 -0000 1.129
+++ main.cxx 18 Sep 2003 01:23:50 -0000
@@ -928,6 +928,11 @@
if ( !inited ) {
inited = true;
+
+ // following run once after fdm is inited...
+ fgUpdateSkyAndLightingParams();
+ // above run once after fdm inits
+
}
if ( ! replay_master->getBoolValue() ) {
@@ -1392,7 +1397,6 @@
fgReshape( fgGetInt("/sim/startup/xsize"),
fgGetInt("/sim/startup/ysize") );
- fgUpdateSkyAndLightingParams();
}
if ( idle_state == 1000 ) {
Loading tile /usr/src/games/fgfs/Scenery-0.9.2/w010n00/w001n00/2938503
Updating Sun position
Gst = 17.5722
t->cur_time = 1025564412
Sun Geodetic lat = 0.0366661 Geocentric lat = 0.0364209
sun angle relative to current location = 0.824245
Updating Moon position
t->cur_time = 1025564412
Moon Geodetic lat = 0.433565 Geocentric lat = 0.43101
moon angle relative to current location = 0.996144
Updating light parameters.
Sun angle = 47.2258
ambient = 0.2 diffuse = 0.999277 specular = 0.5 sky = 0.997832
$GPRMC,230013,A,0000.000,N,00000.000,E,000.0,000.0,0107102,0.000,E*40
$GPGGA,230013,0000.000,N,00000.000,E,1,,,00,F,,,,*19
$PATLA,115.80,280.0,115.80,280.0,379*59
Error writing to socket: 5500
Error writing data.
load() base search path = /usr/src/games/fgfs/Scenery-0.9.2
Loading tile /usr/src/games/fgfs/Scenery-0.9.2/w010n00/w001n00/2938511
Updating Sun position
Gst = 17.5724
t->cur_time = 1025564413
Sun Geodetic lat = 0.402627 Geocentric lat = 0.400212
sun angle relative to current location = 0.654801
Updating Moon position
t->cur_time = 1025564413
Moon Geodetic lat = -0.0710015 Geocentric lat = -0.0705277
moon angle relative to current location = 2.24961
Updating light parameters.
Sun angle = 37.5174
ambient = 0.2 diffuse = 1 specular = 0.5 sky = 1
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