MichaelJF <fri### [at] t-onlinede> wrote:

> In a way, you have to look at the
> surface from the "inside" of the object.

Sorta.
I think it has more to do with the extent of the visible surface:

https://wiki.povray.org/content/Reference:Isosurface

"When the isosurface is not fully contained within the contained_by object,
there will be a cross section. When this happens, you will see the surface of
the container. Using the open keyword, these cross section surfaces are removed,
and the inside of the isosurface becomes visible."

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