> Hi all,
>
> I'm playing around with POV-Ray to make two plano-convex lenses, at first with a
> CSG intersection, and then with numerically calculated data points rotated with
> a quadratic spline lathe.
>
> The problem I'm having now is the plano-convex lens made from a sphere
> intersected with a plane converges light as expected:
>
> Image 1)    http://img193.imageshack.us/i/planoconvexjpg.jpg/
>
> But then when I make the lens with a lathe of 1000 data points, it actually
> DIVERGES light, when it should be functionally the same:
>
> Image 2)   http://img507.imageshack.us/i/planoconvexnumericallin.jpg/
>
> Here is the POV-Ray source code for the first image (CSG intersections)
>
> The code for Image 2 is the same as Image 1 except with a lathe with quadratic
> spline replacing the CSG intersection.
>
> Please let me know what you all think could be the reason for this, and any
> random tips as well as I'm pretty new to POV-Ray.
>
> Thanks!!!
>

You only provide code for the intersection case. You forgot to provide 
that for the lathe.



Alain

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