Wasn't it Tim Soderstrom who wrote:
>
>Actually I may have spoken too soon :) Digging out some good 'ole Trig I was 
>able to figure out how to make a very nice looking curve using splines. The 
>problem is, I want to basically extrude a spline, or complex CSG object (which 
>serve as the rails on the track) along a splined path assuring that it does not 
>distort along the curve. The examples from the link squashed the isosurface as 
>it moved along.

The files you want from that page are the ones that generate a mesh2,
not an isosurface. In the download file it's "SweepSpline01.pov" and
"SweepSpline.inc".

I never did manage to work out how to do that with isosurfaces.

-- 
Mike Williams
Gentleman of Leisure

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