Kagome-Hexagonal grid + Geodesic lines + Splines

Hi there:

I am new in grasshopper and trying to achieve a definition for my research thesis project.

I want to create a “kagome” hexagrid weave system using bamboo, I have seen some examples around and downloading definitions to learn from them, but still don't get it right.

So my problem is:

1.- I want to achieve a kagome, hexagonal gridshell that keeps the bamboo pieces like straight geodesic lines.

2.- I also would like to keep the curved bamboo as splines, so I imagine this will give the easiest method for bending the bamboo at the real scale. As Mårten Nettelbladt in his blog http://thegeometryofbending.blogspot.jp/ mentions, the best way will be to keep the geometry where all the pieces have a spline curvature ( or as B.K.P. Horn calls it “The curve of last energy”) In order to achieve splines do I need to make the grid a Dynamic relaxation “Kangaroo”? will this help?

3.- I would also like to simulate the bending of the elements from a 2D to a 3D, but maybe this can be a next step on the definition…

Some of the common problems that I notice in the definitions found is that when people do weaving, the lines don't bend flat to the geometry but rather they twist so when you look close the cross of pieces intersect, which is impossible in real life…

As you can see there are a number od issues here, I apologize to put them all together, maybe it makes this confusing but I think is better to look at the whole picture. I have been reading a lot but I have no idea how to start.

The more I read the more interesting the subject becomes but the more confused I become. Is there some kind soul that could give me a hand? Any help will be really appreciated.

Thanks a lot!

Miguel

Replies to This Discussion

Permalink Reply by Miguel on February 23, 2014 at 5:30pm

Photos attached below:

Thanks!!

Permalink Reply by JS on February 24, 2014 at 6:50pm

Hi I gave it a shot. For the most part they don't intersect, but I couldn't make it a 100% perfect.

Attachments:

hexagrid weaving.gh, 24 KB

Permalink Reply by Miguel on February 24, 2014 at 10:59pm

Hi JS, thanks a lot, let me take a look with more time, I just opened it quickly but there are many things I am not getting yet... Just a quick question, if I apply this into a geometry, will the lines stay straight as splines, any idea? I also saw a component "surface morph" at the end of your definition, but its off...

Thanks again!

Permalink Reply by JS on February 25, 2014 at 6:06am

Feel free to ask questions since the definition I made is messy.

I made the lines interpolated curves. Those are splines right? They become a little stretched when applied to a really deformed surface. Perhaps there is a better way to apply a pattern?

I tried map to surface as well in the this new attached definition below, so check it out and let me know if you think that is better.

You can turn the surface morph on I just turned it off to make it faster.

Attachments:

hexagrid weaving.gh, 25 KB

Permalink Reply by Pep Tornabell on February 25, 2014 at 9:02am

Miguel!

We did some projects with kagome lattice and geodesic wooden planks, you can take a look here

We normally use kangaroo to find elastic geometries, so it might be complex to achieve geodesic staight planks on doubly curved surfaces in a "regular" lattice, you can see a simulation here

If you want just single curvature, or don't mind about not having flat stright elements, it should not be complicated :)

if you have any doubts don't hesitate on contacting us

Permalink Reply by Miguel on February 25, 2014 at 11:03pm

Pep, very interesting pavilion, I notticed that if I want to keep a regular lattice it is not so easy to have the geodesic, so maybe it does not have to be regular at all, *your project looks pretty close to what I am trying to achieve. Right now I am working with analog experimentation, and I am giving it a twist, I am changing one of the three lines for a "rope" I dont know what problems or flexibility this will bake but it is part of the experimentation....

By the way can you share the kangaroo definition of that project? and is there more information of the design process? I will love to learn more from your work.

Thanks a lot

PS:I will soon add some photos of the physical mode using the rope. .

Mig.

Permalink Reply by Miguel on February 25, 2014 at 10:56pm

Hi JS, thanks!

That looks nice, I will take a closer look later, now my teacher put me to do some analog experimentation with bamboo that is not allowing me to sit on the computer to work with this.... I will probably get back soon..

Thanks a lot for your help and your time!

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