Previously the BVH tree used by fgelev did not load the
lowest LOD tiles in WS3.0 resulting in incorrec elevation
values being returned.
This changes forces the BVH tree to flatten and load all
the nodes of the tree.
added --use-vpb argument
fgelev: added --tile-file argument
fgelev: enable VPBActive via SGSceneFeatures() as well
When fgelev runs, it does not load the scenery through the normal
process of FGScenery::ScenerySwitchListener(), so
SGSceneFeatures::instance()->setVPBActive() won't get called
unless we do it manually here.
Requires FGData commit: 0565eaab10a5d466cd485766b17d1870936a0a57
(which actually renames the file).
Also disables the preferences-load command since I don’t believe it
would actually be safe to reload the defaults without doing a simulator
reset (aircraft -set.xml values would be overwritten, for example)
Add option --print-solidness
without this option, behaviour of fgelev is unchanged
with this option the word "solid" gets printed behind the elevation if the
material at the given location is solid. A hyphen (-) gets printed otherwise
Remove uses of .str(), .c_str() and some other methods of SGPath.
Pass SGPath directly where possible, or explicitly convert to the
appropriate 8-bit encoding.
default of 10 if given.
This improves performance _a lot_ if massively probing across
a bucket border as it prevents constant terrain unloading/reloading.
Adapt to corresponding SG change to make SGMaterialLib be ref-counted,
and have the 'reload-materials' command notify the tile-manager of this,
so it can update the options struct it passes to new tiles.
