Hello,

I use osg long time ago, but I think I don't understand the light concept. Can 
everyone explain me the correct use of Light, LightSource and ShadowMap?

In previous implementations I put the Light into the LightSource and the 
LightSource into my scene graph. Now my root node is a ShadowGroup. But the 
Shadow doesn't work.

Musst I use a special order in the graph?

Why there are a Light and a LightSource?

Is the relative position of the shadow group to the light source important?

Thanks

Martin
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