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.


ntoand/osg,artoolkit/osg,stmh/osg,koshman86/osg,XiaoCC/osg,XiaoCC/osg,ghub/osg,stmh/osg,omega-hub/osg,XiaoCC/osg,koshman86/osg,artoolkit/osg,omega-hub/osg,koshman86/osg,koshman86/osg,ntoand/osg,ntoand/osg,XiaoCC/osg,artoolkit/osg,ntoand/osg,artoolkit/osg,omega-hub/osg,stmh/osg,stmh/osg,omega-hub/osg,ghub/osg,XiaoCC/osg,ghub/osg,stmh/osg,ghub/osg