Moroccan Tent Kangaroo Tensile

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Permalink Reply by Anders Holden Deleuran on May 13, 2015 at 2:37am

Whenever you anchor or pull at one vertex there is a tendency that its incoming edges become disproportionately long in comparison to the remaining edges. A simple fix to this is to add an additional spring to these edges or to increase their spring strength. Another option is to use the SoapFilm force/goal on a triangulated mesh instead of the springs. It is my understanding that this might also help with these local "distortions". If you do go with a quad-mesh, it probably also make sense to have its topology better match where the tentpoles go (i.e. start with a coarse low poly mesh and quad-subdivide, make this mesh either manually in Rhino or come up with an algorithm in GH). Hope that gives you some ideas :)

Edit: Also, you can pass your mesh (as well as lines and polylines) into the Geometry input on the Kangaroo solver. Makes it easier to manage input/output geometry. Note that this will work with datatrees.

Permalink Reply by Nenov Ivo on May 14, 2015 at 9:35am

Thank you very much for your advises ! I Finally, i put the points in rhino and the result was almost good. I tried with the soap film force but i think i didn't use it well it gives me a very strange result. First i triangulate the mesh, after i explode my faces, get the points to have lists with three elements and after i flipped the matrix and put each vertices in each params of the soap film... maybe it's because i explode the mesh ?

What means "a coarse low poly mesh" ?

Thanks again and really amazing videos by the way, hope I'll get this far one day

Permalink Reply by Daniel Piker on May 14, 2015 at 10:07am

Hi Nenov,

As I described in this post:

http://www.grasshopper3d.com/xn/detail/2985220:Comment:1277242

sharp points do not work with soap films (digital or real-world).

Membrane structures don't have to be pure soap-film shapes, but still, really spiky surfaces are usually avoided. One option is the openings like in Otto's Stuttgart train station design:

Other options are rounded bumps:

Or if the spikes are an important part of the look you want, you could use a ring and have an additional cone-like piece covering it:

Also - if you are having trouble with the soap-film elements, you can post the file and I'll take a look.

Permalink Reply by Nenov Ivo on May 26, 2015 at 6:10am

Sorry i've not answered before (my final jury is coming fast...)

Thanks for your response. It's very explicit. I understood with the example in the other post.