Grasshopper

algorithmic modeling for Rhino

Information

Exoskeleton

Exoskeleton is a free plug-in for creating meshes. It is currently comprised of two components: Exo Wireframe and Cytoskeleton.

  • Exo Wireframe thickens line/node into watertight meshes. It solves the nodes using a convex hull and stitches the hulls together with polygonal struts.
  • Cytoskeleton thickens the edge network of any existing mesh into a thickened mesh. The topology of the base mesh enables the production of a clean quad meshes whose vertices are all of even valence. Because It uses the half-edge mesh library developed by Daniel Piker and Will Pearson, it also requires the installation of the Plankton dll's and gha.

Exoskeleton remains a work in progress, and as bugs are fixed and new components and features introduced, updates will be placed here. Furthermore, Exoskeleton is an open-source library.

Download the most recent version here: Exoskeleton2_150904.zip

This has been updated to also include Plankton version 0.3.4

This library is distributed under the terms of the GNU Lesser General Public License (LGPL).

(The source is available on GitHub here)

Please use this discussion forum to post questions, describe issues, and provide feedback (and examples!).

Copyright 2014 Daniel Piker and David Stasiuk

Thanks to Will Pearson, for his work on Plankton and who also has given some invaluable contributions to Exoskeleton in terms of project organisation. Thanks also to Giulio Piacentino for Weaverbird, and for general knowledge and support, and Mateusz Zwierzycki for the same, as well as for sharing his code for convex hulls, which although not used explicitly here, was very helpful in many regards for the development of Exoskeleton.

Members: 380
Latest Activity: Apr 8

Discussion Forum

Exoskeleton meshes not joining??

Hi,I have just started using Grasshopper for university so please excuse my ignorance.I am trying to use Exoskeleton to thicken lines to use in an architectural rendering.  My first few attempts did…Continue

Started by Deanne Neilson Sep 10, 2018.

Can't get Cytoskeleton to load.

Rhino 6.I have Plankton v0.4.2 from https://github.com/meshmash/Plankton/releases (I also tried Plankton v0.3.0). Using…Continue

Started by Mike May 15, 2018.

Problem Using ExoW

Hey Guys,I am having a problem when joining two wireframes into one Exoskeleton Mesh. As you can see in the Pic#1 I was able to thicken the wireframe while having a problem after mirroring the…Continue

Started by Xiaojiao Xu Apr 16, 2018.

exo producing open mesh 2 Replies

Hey guys,I'm trying to create a mesh for 3d printing, but my exoskeleton/cytoskeleton and plankton components are producing this open mesh instead of the air tight closed mesh. As you can see from…Continue

Started by Clayton Nickum. Last reply by Clayton Nickum Feb 5, 2018.

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Comment by David Stasiuk on May 27, 2015 at 3:22pm

Exactly. For each strut, check it against each of its neighbors, and test the angle. From this - and the radius of both struts - you can calculate a minimum offset required. Then you set them at the "worst" case value.

Comment by martyn hogg on May 27, 2015 at 1:25pm

I'm trying to do it with components.

It's the "angular proximity to it's neighbours" that I'm struggling with.

I guess I need to work out the angle between the struts and then just look at any angles that are acute and then work out the required offset?

Comment by David Stasiuk on May 27, 2015 at 1:06pm
Hi Martyn- the way it works is that for each node, the convex hull is calculated for either the minimum offset to ensure that it will correctly capture all of the vertices or the offset defined by the user...whichever is bigger. Then, after it solves the convex hull topology, it goes through each strut and "shrinks" it to the minimum depth, based again on the user input, and the strut's radius and its angular proximity to its neighbors. There's a fair amount of trig involved, but nothing really fancy. Are you writing a script, or are you doing it with components?
Comment by martyn hogg on May 27, 2015 at 12:40pm

Hi David, I'm revisiting my exoskeleton definition in order to create one that has square section struts and I need to work out a way of keeping the node depth to a minimum without the struts overlapping. i.e. calculate a node depth for each strut.

I notice your exoskeleton component does this - if you set the node depth too small it holds some node arms away from the node centre point to avoid overlapping.

Can you give me a clue on the strategy for doing this please?

I was going to try and sort the struts of each node in order of angle, then calculate a distance for each strut that would avoid strut overlap but wondered if there is a simpler, smarter way of doing this!

Thanks!

Comment by Mohammad gholipour on May 2, 2015 at 1:13pm

hi
I dont know how to install this plugin help me please..

Comment by h on March 17, 2015 at 6:40am

hi, i am very new in gh also exo. although i installed all the compenents of exoskeleton and unblocked, when i open the file, i get the error, exoskeleton is missing. 

Comment by Gavin on February 27, 2015 at 5:23pm

Hi Alex. That's great, thanks.

Gavin

Comment by ng5 Alex on February 27, 2015 at 4:07pm

Hello Gavin

select grasshopper menu file/special folders/components folder

like any other plugin. make sure you right click/properties the files and unblock them to load successfully

Comment by Gavin on February 27, 2015 at 2:48pm

Hi just wondering where the plankton dll and planktongh dll should be installed.

Regards,

Gavin

Comment by KANAKA RAGHAVAN on February 25, 2015 at 10:56am

Hey David! That worked beautifully! Thanks a tonne!

 

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