[osg-users] Dynamic terrains, DatabasePager + PagedLODs

[Daniel Lazaroff]

Greetings, 

I am looking for suggestions from anyone that might have worked on dynamic terrains (with OSG). 

We currently are in need of having a very large renderable terrain that can be modified (locally,with respect to the viewpoint) in real time (for digging holes). 
I have started to look into using the osgDB::DatabasePager and the osg::PagedLODs. The initial results I have so far a quite interesting. I created a large triangle mesh (on a square surface) with multiple levels of details LOD of this mesh (OpenFlight format). 
I repeated this pattern across over the simulated large flat terrain and was able to appreciate the huge difference the multi-threading used from DatabasePager + PagedLOD (which I was able to generate with the osgpagedlod.cpp example) made compared to only using the main thread with LODs. 

I am now at the stage of experimenting on how to modify the vertex arrays (starting at the highest resolution level mesh) in the PLOD and being 
able to save these modifications back to disk when the PLOD has expired. I am not sure if the DatabasePager can handle this somehow ? (or is it completely impossible) 

Perhaps this has already been addressed in the forum. Thanks for any links or advice about this matter. 

Daniel

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