> I wonder if GH can preview the Klien bottle. I bet it bugs out a > little. Here you go: http://grasshopper3d.googlegroups.com/web/kleinbottle.jpg I don't know much about surface topology, but I think I kind of cheated since i created it from 4 different surfaces. (I used the formulas i found here (the competition): http://www.formz.com/forum2/messages/16/29730.html)
The 'figure 8' klein bottle parametrization works with one surface. You can easily find these formulas (in copy-paste ready format), but it doesn't have the popular klein bottle shape. Apparently, the parametrization for the popular shape is a very long formula, I think wikipedia has it, but you can't just copy-paste, you have to translate it to something grasshopper understands (It's really long). The alternate text of wikipedia's formula images may save some time, but it's still not copy/paste ready.
