Inflate multiple balloons within a boundary volume (using Kangaroo).

As part of the Grasshopper2 material preview I'm looking to inflate several spheres until they fill up a boundary volume. Sphere volume is allowed to grow without bounds, but the total volume is of course limited to the boundary volume. Spheres are not allowed to intersect each other or themselves. I'd also like the sphere/balloon surfaces to appear to be under tension, so no sharp creases allowed. Some control over the balance between inflation pressure and surface tension will be required. Gravity optional.

Whoever comes up with the best solution will be listed as contributor.

Replies to This Discussion

Permalink Reply by Farah on February 19, 2017 at 5:39pm

Hi! I am struggling to open this .gh file could you post it again please?

Permalink Reply by Evaaa37 on May 5, 2020 at 8:33am

Hi!

Im trying to do something similiar but opposite. Is to fill an elastic bag (like if it where spandex or lycra fabric) with harder balls like in this drawing.

Permalink Reply by Jose Espino on June 9, 2015 at 1:58pm

What if you wanted the balloons to make a void within the boundary? like cellular structures

Permalink Reply by David Rutten on June 9, 2015 at 4:17pm

Then you'd have to put another mesh on the inside and join them together into a single boundary shape.

Permalink Reply by Zhini Poh on October 31, 2015 at 5:55pm

Hi all,
I adapted some of the ideas/definitions from here for a cubic close packing study.
Here's the discussion:
http://www.grasshopper3d.com/forum/topics/cubic-close-packing
It's still work in progress, would love to hear from you guys!

Thanks.

Permalink Reply by Leo on October 17, 2017 at 2:35pm

hi,

sorry for digging up this old post but it looks great and i am very curious to try it out!

(David Stasiuk's version)

However, i am getting an error at the Kangaroo Solver:

1. Solution exception:Unable to cast object of type 'MeshBounce' to type 'KangarooSolver.IGoal'.

I tried to change the inheritance of the MeshBounce class to KangarooSolver.IGoal and also tried to run the script with older Kangaroo versions (2.02) but couldn't get it to work.

Does anyone have an idea how to fix this?

Very much looking forward,

Leo

Permalink Reply by Daniel Piker on October 17, 2017 at 3:07pm

Hi Leo,

Here's an updated version of this definition. Hope it helps:

Attachments:

balloonbox.gh, 24 KB

Permalink Reply by Leo on October 17, 2017 at 5:02pm

hi Daniel,

thanks for the quick help!

It seems as if you are using a newer version of Kangaroo (2.4) than currently available on foodforrhino.

Any chance you could share a version for 2.3.3? Or release the update for 2.4? :)

Thanks a lot!

Leo

Permalink Reply by Leo on October 18, 2017 at 2:33am

hey,

tried it on a different computer and no errors here.

It even works with variable pressure. Fantastic!

Thanks again,

Leo

Permalink Reply by John McWaters on July 25, 2018 at 9:00am

Daniel,

Can you explain how the components work together in order to setup the collisions between mesh balloons? I understand the use of the solid collision component, but I'm not clear on how the cross-reference component is being used.

Thanks!