>   Given that the mesh is transparent how could you expect it to work
> correctly if parts of the surface have been removed?
> --
>                                                           - Warp

I only want the ray to refract when it enters the object. The ray should not
be refracted again when it leaves the object through the back side. I didn't
know how to get this effect in POVray, so I thought it would be best if I
just removed the back of the object myself.

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