"dave vanhorn"  wrote in message <457cbdfb@news.povray.org>:
> I'd also be interested in how to do a mobius strip. 

That can be done with a parametric object:

  parametric { 
    function { (1 + v * sin(u / 2)) * cos(u) }
    function { v * cos(u / 2) }
    function { (1 + v * sin(u / 2)) * sin(u) }
    <0, -0.2>, <2 * pi, 0.2>
    contained_by { box { <-1.5, -1.5, -1.5>, <1.5, 1.5, 1.5> } }
  } 

This one is infinitely thin. If you want some thickness, you have to design
a path for the v parameter.

BTW, is it not possible to use vectorial arithmetics for parametric objects?

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