When you set up the technique on your ShadowedScene, you can use any of the 
various techniques from osgShadow.

on this page: 


There is example code for setting up shadows, and, as an example, to use soft 
shadow map shadows instead of standard shadow map shadows, you would change the 
example as below:

 osg::ref_ptr<osgShadow::SoftShadowMap> sm = new osgShadow::SoftShadowMap;

Note you may have to include the relevant osgShadow classes, and you may need 
to pass additional parameters as the defaults may not suit your scene e.g for 
soft shadows, you have parameters like:


which will adjust the appearance of the shadows. The other more advanced 
shadowing techniques like PSSM, LISPSM and VDSM will have different params so 
you may need to consult the docs and/or source for details. 

Note that there doesnt seem to be a great one-size-fits-all solution for 
high-quality shadows in OpenSceneGraph, and I have read a number of posts where 
people are struggling to acheive good results, or have artifacts depending on 
the scene setup.

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