* gh.robin -- 9/5/2007 4:15 PM:
> groundcache.cxx seems to be able to give the material information
[...]
> With a specific property we could have it fully opened.
Isn't the property tree, but might be useful nevertheless:
There's a Nasal function geodinfo() that returns material and
other properties for given lat/lon coordinates. If you really
need it in the tree (e.g. for XML animations), then you could write
a simple Nasal loop that copies it there in regular intervals.
var lat = getprop("/position/latitude-deg");
var lon = getprop("/position/longitude-deg");
var info = geodinfo(lat, lon);
if (info != nil) {
print("the terrain under the aircraft is at elevation ", info[0], " m");
if (info[1] != nil)
print("and it is ", info[1].solid ? "solid ground" : "covered by
water");
}
debug.dump(info);
# outputs
[ 106.9892101062052, { light_coverage : 0, bumpiness : 0.5999999999999999,
load_resistance : 1e+30,
solid : 0, names : [ "Lake", "Pond", "Reservoir", "Stream", "Canal" ],
friction_factor : 1,
rolling_friction : 1.5 } ]
see:
http://wiki.flightgear.org/flightgear_wiki/index.php?title=Nasal_scripting_language
m.
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