:-) I'm sorry, I'll try to explain it again:

I have some kind of surface (I say some kind because is not part of the
official PovRay). I would like to have a "cube" in which the upper face is
this surface.
I intersect the surface with boxes in such a way that they are the walls of
the cube (these plain boxes), but these boxes continue after the hit :-S, I
mean, I can see them higher than the surface. The perfect situation is that
these walls stop when hitting the surface.

I think is something like boxes_clipped_by_surface (the main part I want to
keep "entire" is the surface).

I hope now is more understable (in any case, sorry for my English ;-) ).

Mike Williams <nos### [at] econymdemoncouk> wrote:
> Wasn't it nusuto who wrote:
>
> >2. I have a surface and I would like to make it the upper face of a cube.
> >How can I intersect the other three faces of the cube with my surface? I
> >mean, when I intersect a box with a surface, I see the whole box, it
> >doesn't stop at the surface. How can I do that?
>
> The hard part is trying to guess what you want. Is it possible that you
> want surface clipped_by box?
>
> --
> Mike Williams
> Gentleman of Leisure

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