optima wrote:

> I wonder what do I need to do to get renderings like this from povray?

on smoothly curved surface such as this you might
try using an aoi pattern (giving black when the surface
is viewed at a very shallow angle only).

If you have meshes you can try PovEdge:

   http://tuabiht.chez-alice.fr/PovEdge_Site/PovEdge.html

But in most cases, you will actually need to model
the edges as geometry (e.g. use thin cylinder/torus).

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