Hi David,

I assume you do not wand to max out at runtime but at harddsik, right?

In this case, it is easy: I've extended osgFileCache some month ago. It 
supports now also files from local sources. With its ability to limit the 
caching to certain extend and certain level, you can run it multiple times to 
build up a limit dataset out of a full dataset.

I use it to extract notebook-compatible datasets  with hi-res insets from my 
full TB size terrain dataset.

Please read my tutorial how to proceed: 
http://www.openscenegraph.org/projects/VirtualPlanetBuilder/wiki/ExtractLimitedPartDatabase


enjoy,
Torben

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