= Changes To Drawable =
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The following changes are essential to make to affected code, otherwise your original draw methods won't ever be called, if you subclass from Drawable, `Drawable::DrawCallback`, or `Drawable::CullCallback`. 

To enable more data about the current rendering traversal to be passed in the Drawable draw callbacks and subclasses drawImplementation method a new data strcture `osg::RenderInfo` has been introduced, and is now passed into the drawImplementation(..) method instead of `osg::State&.`  !RenderInfo "has a" `osg::State` object so you can get this simply and use as before.

Your sublcasses from `osg::Drawable` will need to changed from:
{{{
class MyDrawable : public osg::Drawable
{
   ...
   
   void drawImplementation(osg::State& state) const;

};
}}}
To
{{{
class MyDrawable : public osg::Drawable
{
   ...
   
   void drawImplementation(osg::RenderInfo& renderInfo) const;

};
}}}
The implementation of drawImplementation can be amended a bit to get back the `osg::State` object if you use it.
{{{
void MyDrawable::drawImplementation(osg::RenderInfo& renderInfo) const
{
    osg::State& state = *renderInfo.getState();

    ... // code as before, no other changes required.
}
}}}
Similar changes are required for `Drawable::DrawCallback` and `Drawable::CullCallback`.