The superduperformula is a generalization of Johan Gielis superformula, allowing for the creation of various 3d forms including closed shapes, shells and toroids. If you run the sketch locally you can save the result in various 2d and 3d formats.
Use the mouse while pressing one of the param keys to change shape parameters. The mapping of param keys is displayed inside the help panel.
This sketch is part of the <a href="http://www.k2g2.org/blog:bit.craft">BIT.CRAFT</a> series exploring the convergence of craft and computation.