Simple tensile Kangaroo question

Hello there,'

I am trying to create a tensile structure on a plane surface of a platonic solid ( I am picking only one of the faces of the platonic dodecahedron) which is basically a polygon.

I am using lunch box in this script, but if u dont have it, know that I am just trying to manipulate a simple 5 edged flat polygone.

Here is the rhino and grasshopper script and print screen.

I think the main problem come from the number of messy points that are dividing the polygon.

Attachments:

Replies to This Discussion

Permalink Reply by Mohanned Iskanderani on October 14, 2014 at 3:58am

Also any idea why the mesh get messed up when it gets converted from surfaces and divided ?

Attachments:

Tensile question 2.png, 439 KB
TENSILE PLATONIC SOLID 3.gh, 21 KB

Permalink Reply by Daniel Piker on October 14, 2014 at 4:26am

Hi,

You have a flat polygon, with all the edges fixed, so relaxation will do nothing.

(A flat surface is already a minimal surface)

Maybe you could sketch the effect you are hoping to achieve?

Permalink Reply by Mohanned Iskanderani on October 14, 2014 at 6:05am

It absolutely make since that if its flat relaxation wont do anything now that you pointed it out. But if u check the second picture, its closer to what I want where things are not flat anymore. Here is a sketch too.

Permalink Reply by nikos tzar on October 14, 2014 at 8:51am

Hi Mohanned,

Is this what you want?

This is a relatively "clean" method to design your mesh. The tranform from surface to mesh, that you were trying to create, had some strange results mainly because you started from trimmed surfaces.

Additionally you can extract just the naked edges of the mesh and create springs for them with higher rest length so they can behave as cables...

Attachments:

TENSILEPLATONICSOLID-nt.gh, 16 KB

Permalink Reply by Mohanned Iskanderani on October 15, 2014 at 1:35am

That is incredible. Thank you so so much Nikos.

Permalink Reply by Mohanned Iskanderani on October 15, 2014 at 2:15am

One final question, how can change the mesh into surfaces ? I would like to project curves on it and I have researched enough to know that it is close to impossible or very difficult

Permalink Reply by Mohanned Iskanderani on October 15, 2014 at 3:03am

to project curves onto meshes that is

Permalink Reply by nikos tzar on October 15, 2014 at 6:14am

There are some mesh to surface definitions in this thread

For one surface, there is nor a single answer on how to do this or even if it is possible (see this thread)

Permalink Reply by ng5 Alex on October 15, 2014 at 7:24am

you can check by parent component as suggested in the following thread.

http://www.grasshopper3d.com/forum/topics/mesh-to-surface-loft-comp...

cheers

alex

Permalink Reply by nikos tzar on October 15, 2014 at 8:57am

This is a nice approach but it doesn't seem to work with triangular mesh faces.

Permalink Reply by ng5 Alex on October 15, 2014 at 10:46am

You see when i suggested the previous thread it was for the general topic of mesh to surface transformation, like the two links you posted, and not for this specific situation.

In this case fragmented patch could output an open brep or 6 surfaces, if surfaces are a necessity. For smoother result i tried patch component but it could not handle the pointy top of this geometry.

cheers

alex

ps in your initial definition you are getting two identical meshes as an output, making the calculation harder. you need to flatten your anchor points.

Permalink Reply by Mohanned Iskanderani on October 27, 2014 at 6:51am

Thanks Alex and Nikos for all the help. I have went back to this script to make it adaptable to multiple faces at the same time but its giving me a really hard time.

Here is a picture. The issue starts to happen in the "Construct Mesh" component.

Basically am trying to do the same tensile effect but on all multiple different faces of the Platonic Solid