Hi Pierre, I think there is probably a couple of issues.
You don't say which osgShadow::ShadowTechnique you use, it may well be you've picked a very simple one that isn't capable of handling this type of geometry combination. Second, shadows on back faces should be the same colour as the back face because essentially there are same thing - a face without any direct lighting. The lighting model for you data is clearly not coherent between the shadow and the back face. I don't know how you've set up your lighting but clearly something is amiss here. Are you using a different light sources? Do you have ambient lighting different between the shadow and box rendering? Robert.
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