how to make this shape "curvy" ?

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Hi,
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 Patch
Copy patch and select New From Clipboard in Max.

Thx in advance,
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