Mike Williams <nos### [at] econymdemoncouk> wrote:
> Wasn't it tgl who wrote:
> > Advanced users
> >Is there a reasonably easy way to outline an irregular and curved 2D shape
> >with hollow cylinders?
>
> You might consider the difference of two spheresweep objects that follow
> the same path but have a different radius.
>
> --
> Mike Williams
> Gentleman of Leisure

What about using a hollow sphere_sweep with differenced clear ends?
difference{
  sphere_sweep{
  //any sweep from A to B, 0.9 thick
  }
  sphere{A,1 pigment{Clear}}
  sphere{B,1 pigment{Clear}}
}

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