> Thanks very much guys, 
> osg::LightModel/GL_LIGHT_MODEL_TWO_SIDE seems exactly what I needed.
> Thankyou,
> Mike

In case it's not obvious, with two-sided lighting you do not need to
re-parent your mesh to two Geodes with different face culling. You should be
able to use a single Geode, face culling disabled, and two-sided lighting
enabled.
   -Paul

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