Alberto, Firstly, you need to prevent the CullVisitor from considering your skydome in it's autonear/far calculation. You can do this with skydome->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR).
You will also need to "mimic" being a long way away via, most simply by drawing first (e.g. via a pre draw camera, or good control of your render bins) with depth checking/writing disabled. If you have expensive shaders on your skydome, you might want to draw last to z depth = 1 (via stateset->setAttributeAndModes(new osg::Depth(osg::Depth::ALWAYS, 1.0,1.0))). NB - you might need LEQUAL, depending on how you cleared your zbuffer. Depending on what you are dong, you might still also run into a problem in which your skydome is clipped, so you'll need to control the projective camera; look at the DepthPartition example if you need a way forward. Hope that helps, David
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