> When you use Ingo's "param.inc" file, it converts your functions into a
> *mesh2* object rather than an actual isosurface. Mesh2 objects can't be
> used in differences.
>
> The docs say:
>
>    There are six totally thin, finite objects which have no well-defined
>    inside. They are bicubic patch, disc, smooth triangle, triangle,
>    polygon and mesh / mesh2. They may be combined in CSG union but
>    cannot be used in other types of CSG (or inside a clipped_by
>    statement).
>
> --
> Mike Williams
> Gentleman of Leisure

Well, too bad. Anyway, parametric equations give us such amazing flexibility
that it didn't take 3 minutes before I got even better "sblorgles" just
playing with the parameters.

Thanks for the pointer.

Ruy

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