Added sampling down to 32x32 mesh for 64x64 height fields as a workaround to  memory consumption issues with high res whole earth paged databases.
Added sampling down to 32x32 mesh for 64x64 height fields as a workaround to 
memory consumption issues with high res whole earth paged databases.


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