how to compute central line form surface objects

[Olivier Coulon]

Jan Ehrhardt wrote:

> Oliver,
>
> yes it´s not properly defined what is the "central line". But
> I hope everyone knows what I mean.

I completely see what you mean as well, but what I meant is that this is
quite intuitive and I think (I might be wrong) that a mathematical (or at
least algorithmic) definition is more difficult to obtain.
Very best wishes anyway,

- Olivier

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