Switched from loading FBX and FST simultaneously to loading FST first, then
using its filename and texdir properties (as Faceshift does) to locate the
corresponding model.  Also fixed a bug with the fallback models (they were
invisible after second failure).
Merge branch 'master' of https://github.com/highfidelity/hifi
These need to be FST files, too.
Merge branch 'master' of https://github.com/highfidelity/hifi
first experimental cut at overlay image
fix voxel texture to work better with larger TREE_SCALE
first cut at auto-LOD adjustment
Merge branch 'master' of https://github.com/highfidelity/hifi
Merge branch 'master' of https://github.com/worklist/hifi into lowerLODnoFPSdrop
add proper readWriteLocks around the VBO arrays to preven random triangles
first working cut at recreateVoxelGeometryInView()
Basic LOD switching based on distance to camera.
Merge branch 'master' of https://github.com/highfidelity/hifi
Wait until each LOD level is actually requested before we start loading;
before a level is loaded, try to use the closest already-loaded level.
add menu item for auto adjust LOD
removed some debug
added back setupNewVoxelsForDrawing() on changeTree()
correctly lock arrays on init
Add some hysteresis on the LOD switching to prevent rapid switching back
and forth.
Removed debugging code.