Disabled draping for polygons that has only boundaries (LineSymbol and no PolygonSymbol).
Enabled draping for normal polygons with new TECHNIQUE_DRAPE flag.
Added new continue-single-color option to osgearth_package that continues subdividing even if a tile is a single color.  This is useful when you have a dataset that consists of small inset images that may return completely transparent images on low lods just b/c of the way the GDAL sampling is done.
Merge pull request #312 from AlexBobkov/main

Disabled draping for polygons that has only boundaries (LineSymbol and n...
Merge branch 'upstream/master'