Added the ability to turn off the external paging in of PagedLOD children.

src/osg/PagedLOD.cpp

@@ -54,6 +54,7 @@ PagedLOD::PagedLOD()
     _centerMode = USER_DEFINED_CENTER;
     _radius = -1;
     _numChildrenThatCannotBeExpired = 0;
+    _disableExternalChildrenPaging = false;
 }
 
 PagedLOD::PagedLOD(const PagedLOD& plod,const CopyOp& copyop):
@@ -62,6 +63,7 @@ PagedLOD::PagedLOD(const PagedLOD& plod,const CopyOp& copyop):
     _databasePath(plod._databasePath),
     _frameNumberOfLastTraversal(plod._frameNumberOfLastTraversal),
     _numChildrenThatCannotBeExpired(plod._numChildrenThatCannotBeExpired),
+    _disableExternalChildrenPaging(plod._disableExternalChildrenPaging),
     _perRangeDataList(plod._perRangeDataList)
 {
 }
@@ -198,7 +200,9 @@ void PagedLOD::traverse(NodeVisitor& nv)
                 }
 
                 // now request the loading of the next unloaded child.
-                if (nv.getDatabaseRequestHandler() && numChildren<_perRangeDataList.size())
+                if (!_disableExternalChildrenPaging &&
+                    nv.getDatabaseRequestHandler() &&
+                    numChildren<_perRangeDataList.size())
                 {
                     // compute priority from where abouts in the required range the distance falls.
                     float priority = (_rangeList[numChildren].second-required_range)/(_rangeList[numChildren].second-_rangeList[numChildren].first);