Hi,
I've been trying to make the shader's snow line listen to METAR. METAR reports
whether an airport
has snow on the ground or not. Apparently FlightGear was already set up to read
this and put it in a
property: /environment/metar/snow-cover.
I wrote a Nasal script, everything works fine, but I stumble accross a problem
with my listener. For
some reason the snow-cover property seems to be tied and therefore it always
reports "nil" to a
listener (AndersG said so, I got no idea what that means).
Would it be possible to untie the prop? Or is there a better solution? You can
find the script below.
Cheers,
Gijs
var snowLineDefault = 3200;
var checkSnow = func {
var snowCover = getprop("/environment/metar/snow-cover");
var stationElev = getprop("/environment/metar/station-elevation-ft") *
globals.FT2M;
var snowLine = getprop("/environment/snow-level-m");
# no data available, fall back to default
if (snowCover == nil){
snowLine = snowLineDefault;
}
# no snow at station's altitude, plausibly higher
if (snowCover == 0){
if (stationElev < snowLineDefault) { snowLine = snowLineDefault; }
if (stationElev >= snowLineDefault) { snowLine = stationElev; }
}
# snow at station's altitude, plausibly lower
if (snowCover == 1){
snowLine = stationElev;
}
setprop("/environment/snow-level-m",snowLine);
};
_setlistener("/sim/signals/fdm-initialized", func {
_setlistener("/environment/metar/snow-cover", checkSnow);
});
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