[osg-submissions] Fix for FLT export inefficiencies

[Paul Martz]

Hi Robert -- 
 
As I discovered prior to the 2.4 release, the FLT export geometry backend
was using some old turn-on code, originally written just to enable other
development but not intended for actual release. Sadly, my OSG training
commitments prevented me from fixing this prior to 2.4.
 
In essence, the FLT exporter was emitting a full set of Mesh records each
time it encountered a PrimitiveSet.
 
Attached is a fix. The code now emits the Mesh set up records, then iterates
over all PrimitiveSets and emits a Mesh Primitive record per PrimitiveSet.
 
It also loops over PrimitiveSets twice, first writing Face records according
to the mode, the writing Mesh records (again according to the mode).
 
The final change included here is support for GL_POINTS as single-vertex
Face records.
 
Billboards are still to come.
 
Thanks,
 
Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com <http://www.skew-matrix.com/> 
+1 303 859 9466
 
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