"uekstrom"  wrote in message
<web.49425fa548f3798df1d58de20@news.povray.org>:
>	   For doing this I think I need a transparent or filter value that
> depends on the surface normal. The surface should be transparent when facing
> the camera and opaque when viewed from the side.

Are you sure that is how x-rays look like? Intuitively, I would have thought
that only the thickness would have any influence. Surfaces seen from the
side are more opaque because the rays traverses them diagonally. Such an
effect could probably be obtained with an absorbing medium, or maybe with an
emitting one.

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