Showing posts with label nonorientable. Show all posts
Showing posts with label nonorientable. Show all posts

Monday, 15 February 2010

Kusner Minimal Surface

Discovered by Rob Kusner, Director of the Center for Geometry, Analysis, Numerics and Graphics (GANG). The Kusner surface is an inversion of the Boy surface. The three discs are planes "reaching infinity".

Saturday, 6 February 2010

Le Topologicon

Le Topologicon is a great comic book about topology. The author is Jean-Pierre Petit who discovered the first parameterization of the boy surface in 1981. He is also the co-founder of the non-profit organization Savoir-sans-frontiers. The book deals with moebius strips, klein bottles, boy surfaces, magnetic fields, surface stiching and a lot more interesting topics. In my opinion, the Topologicon is a must-read for everyone dealing with surface modelling, mesh modelling, subdivision surfaces, surface tesselation, vector fields, deformations, or topological space. Some example pages:



Sunday, 17 January 2010

Homotopy of Boy and Roman Surface

In topology, a smooth deformation from one surface in an other is called homotopy. The parameterization of this homotopy can be found on wolfram's page.





The grasshopper definition, download here.

This figures from Werner Boy's paper (1903) show the topological construction of the boy surface.

A proposal for a pavillion by Christophe Delsart and Yvan Ngnodjom based on the boy surface for the ARPAM project.

Thursday, 7 January 2010

Boy Surface

The Boy Surface has been found 1901 by Werner Boy. One obtains a topologicaly equivalent surface by attaching a Möbius strip to a disk along its boundary. Like the Möbius strip this surface is nonorientable.




This beautiful parameterization, based on complex numbers, was discovered in the late 1980s by Rob Kusner and Robert Bryant. In this post the boy surface has already been mentioned on eat-a-bug.



Download the definition here

Tuesday, 10 March 2009

Moebius Strip

Moebius strip around curve
Number of twists is changeable

MoebiusStrip.zip

Sunday, 11 January 2009

Klein Bottle

NURBS surface generated with grasshopper
Shape and diameter of the bottle are changeable

KleinBottle.zip