I tried log-level=info and flew around Sembach until it happened again.
Here's some console output:
...
prepare_ground_cache(): ac radius = 11.7738, # leafs = 0, ground_radius = 0
prepare_ground_cache(): trying to build cache without any scenery below the
aircraft
FGInterface is beeing called without scenery below the aircraft!
Updating Sun position
Gst = 19.2257
t->cur_time = 1043061518
Sun Geodetic lat = -0.351757 Geocentric lat = -0.34959
sun angle relative to current location = 1.21658
Updating Moon position
t->cur_time = 1043061518
Moon Geodetic lat = 0.307437 Geocentric lat = 0.305505
moon angle relative to current location = 1.86307
Updating light parameters.
Sun angle = 69.7049
ambient = 0.2 diffuse = 0.977531 specular = 0.5 sky = 0.962797
prepare_ground_cache(): ac radius = 23.2997, # leafs = 0, ground_radius = 0
prepare_ground_cache(): trying to build cache without any scenery below the
aircraft
FGInterface is beeing called without scenery below the aircraft!
...
I've heard others talk of this problem, but this is the first time I've seen
it myself. Could it be the European terrain data resolution versus U.S.
terrain data resolution? Anyway, it would seem that a fix would be to keep a
copy of the last tile info, and if no tile is found on the next update then
the last one can be used until a new one appears.
Dave
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