In article <39981ff8@news.povray.org>, "Zeger Knaepen" 
<zeg### [at] yahoocom> wrote:

> What about an isosurface representing a mobius-ring?

Make one. :-)
The only way you can do it with an isosurface would either give the 
strip thickness, so it would have an internal side and an external side, 
or leave a discontinuity where the normal flips.

It should be possible with the parametric shape, in which case I think 
there will still be a discontinuity at the point the beginning and end 
meet. That, or it will always show the "outside" texture. I don't know 
how the parametric calculates normals.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
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