G?nther Dietrich <gue### [at] despammedcom> wrote:
> Have you already tried the intersection of two CSG-speres? That's just 
> what real spheric optical lenses are.

  Are you sure? Can you give a reference?

  I have tried to find the exact mathematical function for a convex lens
geometry (ie. a lens which focuses perfectly and evenly) but I just can't
find it on the net.

  As far as I can tell, there are at least two possibilities: The surface
of the lens has to be parabolic, or it has to be spherical. It might also
be that it has to have some other shape. However, I can't find this info
anywhere!

-- 
                                                          - Warp

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