Jérôme M. Berger nous illumina en ce 2009-05-09 05:12 -->
> EricG wrote:
> | Question:  what is causing the "ghost" of the peak of the
> isosurface (the part
> | cut out by the difference operation?
> |
>     From the docs:
> By default POV-Ray searches only for the first surface which the ray
> intersects. But when using an isosurface in CSG operations, the
> other surfaces must also be found. Therefore, the keyword max_trace
> must be added to the isosurface statement. It must be followed by an
> integer value. To check for all surfaces, use the keyword
> all_intersections instead.
> With all_intersections POV-Ray keeps looking until all surfaces are
> found. With a max_trace it only checks until that number is reached.
> 
> http://povray.org/documentation/view/3.6.1/300/
> 
>         Jerome
I go with this explanation and cure. In your case, a max_trace 3 should be 
correct: across the peak, you cross 2 hiden surfaces before you reatch the one 
you are interested in.

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