Among other things, Jim Charter saw fit to write:

> Anyway I came up with a brute force seam spline which you can find
> posted in p.b.scene-files.  There is also some code there for walking
> the spline and creating a parallel set of points on either side of a seam.

You may find this interesting:

http://www.mathcurve.com/courbes3d/couture/couture.shtml

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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