"Bald Eagle" <cre### [at] netscape net> wrote:
> This was very exciting to me, as it solves some problems I've had with sine
> waves and offset curves.
> But as you can see, it also fixes the scaling of the thickness of an ellipse.
> You can imagine this being used to fix a torus scaled into an elliptical torus.
AND .... this same approach was implemented by ... user And in 2013 to make
constant-thickness isosurface shells.
http://news.povray.org/povray.binaries.images/thread/%3Cweb.5264d1b954cff585cc1fd1150%40news.povray.org%3E/?ttop=423056
&toff=750&mtop=423452&moff=10
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