On 7-8-2011 20:41, folkert wrote:
> "Marc-Hendrik Bremer"<Mar### [at] t-onlinede>  wrote:
>> Slime schrieb in Nachricht<3c2ffc25@news.povray.org>...
>>> Hmm, what's the formula for a klein bottle?
>>
>> How about using the f_klein_bottle(x,y,z, P0) in functions.inc as an
>> isosurface?
>
> I've tried that one but it gives very strange results:
>
> #include "colors.inc"
> #include "functions.inc"
>
> light_source {<10,10,10>  color White }
> camera { location<4,4,4>  look_at<0,0,0>  }
>
> isosurface {
> function { f_klein_bottle(x,y,z,1) }
>          accuracy 0.01
>          max_gradient 4
>          pigment { color rgb<0, 2, 0>  }
> }
>
> //      pigment {image_map { jpeg "test.jpg" map_type 1 interpolate 2 filter all
> 1.0 } }
>
> box {<-5, -2, -5>,<5, -2, 5>  pigment { color White } }
>
>
> The result is:
>
> http://vanheusden.com/pov/surface.png
>
> Doesn't look like the ones on wikipedia
> (http://en.wikipedia.org/wiki/Klein_bottle).
>

It is not really an answer, but I should still have the source for the 
bottle somewhere in my archive.

-- 
Apparently you can afford your own dictator for less than 10 cents per 
citizen per day.

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