As i said, i didn't expect nothing from the shader... i was only trying v3 and vecView parameters, to simulate an electronic microscope view (that doesn't work, but this is another matter). My problem was that with my custom camera all the objects with the shader applied get flat grey. I made another try, and with the predefined camera it works... maybe it could happen because of the fog parameter?
And btw, while the vecview is expressed in pan, tilt and roll, how it's the normal of the vertex expressed?