Changed the optimization of flat tiles so that it creates a flat 8x8 height field rather than a flat 2x2 height field.  This allows geocentric warping of the tiles without obvious flat regions.
Changed the optimization of flat tiles so that it creates a flat 8x8 height
field rather than a flat 2x2 height field.  This allows geocentric warping
of the tiles without obvious flat regions.


artoolkit/osg,tomasthoresen/osg,jtorresfabra/osg,artoolkit/osg,scrawl/osg,scrawl/osg,tomasthoresen/osg,openscenegraph/osg,scrawl/osg,openscenegraph/osg,artoolkit/osg,marchelbling/osg,jtorresfabra/osg,openscenegraph/osg,scrawl/osg,tomasthoresen/osg,marchelbling/osg,marchelbling/osg,tomasthoresen/osg,jtorresfabra/osg,marchelbling/osg,openscenegraph/osg,artoolkit/osg,jtorresfabra/osg