Hi, 
Nice examples. 
To extend functionality you can add hardware culling like this
http://rastergrid.com/blog/2010/06/instance-cloud-reduction-reloaded/
Also need to make some tests to see perfomance about dynamic matrix 
modification.
I think that best perfomance will be with Divisors.
To remove noisy messages you can comment this lines to work in OSG GL3.0 
stateSet->setAttributeAndModes(new osg::AlphaFunc(osg::AlphaFunc::GEQUAL, 
0.8f), osg::StateAttribute::ON);
and 
switchNode->addChild(lightSource);
in main.cpp
Thank you!
Cheers,
Roman

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