"bri.wood" <bri### [at] ntlworldcom> wrote.
> The metal things are isosurfaces, f_comma and the cushion is another
> isosurface, f_pillow with the bottom cut off with a plane.
>
> bri

Thank you for using f_comma function.   I made the function to express Yin
Yang
as Dan Johnson pointed out.

R. Suzuki

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