I'm reading osglight.cpp, and in createLights() function where 
osg::LightSource(lightS) set StatSet, here are two function:
    lightS1->setLocalStateSetModes(osg::StateAttribute::ON);
    lightS1->setStateSetModes(*rootStateSet,osg::StateAttribute::ON);

My question is what the function of the two StateSetModes, what is the 
difference about these two functions? Thanks~~

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