Warp <war### [at] tagpovrayorg> wrote:
> 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

Is this the sort of thing?
http://www.reference.com/browse/wiki/Lens_(optics)

Stephen

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