how to make this shape "curvy" ?

    Apr 02 2010 | 2:27 pm
    I work with a tri-like shape, wich can be morph into a plane really smoothly wich I like very much…
    I'd like to give this shape a Z-depth, a curve for instance wich could start at the center of the shape…
    I tried to xfade it with other 3d shapes like sphere, but I don't reconize my start shape…
    Hope I'am clear;
    Do you have any clue to break this 2d with a cool curve ??
    here's the patch with the expression:
    max v2;
    Thx in advance,