Surface deformation like membrane or with attractors (baloons)

Good day,

Is it possible to make a form which will be like surface which will become elastic and transform to new form (something like baloon).

I attach two drawings.

Plane surface, which will be transformed.

And, section scheme, which is a form that i want to get from that surface.

I dont know if it is better to get that with membrane definition (better srf) or by some contur curves (simple surface). I tried to make it with membrane definition, but i couldn't get this from surface. I would like to control height of section-deformation of surface and maybe vector of pull (always normal to surface plane).

Please help!

Thank you all

Attachments:

Deformation schemes.3dm, 29 KB
Membrane definition problem.gh, 6 KB

Replies to This Discussion

Permalink Reply by Daniel Piker on June 14, 2013 at 7:20am

Are you saying you want to choose in advance the shape of the inflated form, and then find a flat pattern that deforms to that ? So a kind of inverse form-finding ? This is very tricky*, and in many cases there is no possible solution (for example, you won't ever get a flat or concave surface on a balloon).

If you want easy control over your shape, I'd say rebuild it as an untrimmed NURBS patch, (but bear in mind this won't generally be physically realizable as an inflated surface).

*There was some neat research along these lines last year (http://graphics.ethz.ch/~bthomasz/PDF/Balloons.pdf), but they start from an already curved form, not a flat sheet

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