I think there is a bug in the osg reader/writer for PagedLOD nodes. If you set the LOD::CenterMode to USE_BOUNDING_SPHERE_CENTER then it doesn't get written to the output .osg file because the writer ignores its value unless it is set to USER_DEFINED_CENTER, in which case it just writes out the user defined center, but not the center mode (see LOD_writeLocalData() function in the osg plugin). This doesn't cause a problem for regular LOD nodes because their bounds can be computed from their children, but if you have a PagedLOD node that has no children (because its children area loaded by the pager) then its not possible to compute a valid bounding sphere to use (and it won't try to anyway because the center mode defaults to USER_DEFINED_CENTER). This is different than the way the ive writer works - when I write my PagedLOD nodes to the ive file format and then view them with the osgviewer it works fine, but when I write to osg the externally referenced files are never paged in because it thinks the center of the PagedLOD nodes is (0,0,0).
Alex
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