algorithmic modeling for Rhino



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:

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: 403
Latest Activity: Jan 6

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 (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.

Comment Wall


You need to be a member of Exoskeleton to add comments!

Comment by Daniel Piker on November 3, 2015 at 9:52am

Hi Carlos,

It's better if you make a separate post in the discussion forum above, as it makes the conversation easier to follow. The angle in cytoskeleton comes from the normals and face angles of the mesh. What effect do you want to achieve?

Comment by Carlos García on November 2, 2015 at 1:22pm

Hello all!

Im experimenting with weaverbird+cytoskeleton and I was wonder how I can control the angle that cytoskeleton made  

Comment by David Stasiuk on September 4, 2015 at 1:31am

Thanks for the head's up, Dafik! The file has been updated to reflect the current release of Plankton.

Comment by DAFIK SMAK on September 4, 2015 at 12:28am

Please releases component PlanktonGh.dll from 0.3.0 to 0.3.4 Thanks you

Please to update the current release because it's actually the  not correct DLL.

thanks very much

Comment by martyn hogg on June 7, 2015 at 8:05am

I got there eventually... the sl3dHull seems a bit buggy sometimes; I have to switch off parts of the model to get it to work.

Anyway, in theory I could make this, in practice I need to build a new CNC router first!

The overlapping mesh faces at the corners are just because the struts and nodes will interlock and the interlocking feature is not modeled

Comment by martyn hogg on May 28, 2015 at 12:14pm

Blimey, thank you! That would have taken me ages and will indeed take me ages just to understand it all and be able to re-create it but it is just what I was aiming for.

I always get stuck on managing data and notice you do some clever tricks with components like Propagate Ancester, PShift, Flip Last etc. which i really need to think about hard to understand and visualise what they are doing.

I like the smoothing end result. I'd not considered doing this but I will see if I can get some smoothing. The idea is to CNC the nodes from wood with a type of mortice and tenon joint and use approx 50mm x 50mm timber for the struts. I'd probably need to minimise the smoothing of the nodes where the struts will join but try and keep some smoothing in the centre of the nodes.

Thanks again!

Comment by David Stasiuk on May 28, 2015 at 5:37am

Here you go. I've also added at the end my Catmull-Clark implementation with'll need Plankton for that to work. If you don't have it, though, so long as you have [UTO]'s MeshEdit tools and Tree Sloth, the rest should be more or less follows the logic of the Exo plug in, just using components.

Comment by martyn hogg on May 27, 2015 at 4:54pm

I'll have to spend a bit fo time on this I think!

Blog Post With File

I'm getting lost in data structures again!

Comment by martyn hogg on May 27, 2015 at 3:46pm

Thanks! I'll try that... I'm sure I got the Tree Sloth plugin but can't see the list comparisson component in the Tree Menu. The components should all be in Sets >> Tree right?

Comment by David Stasiuk on May 27, 2015 at 3:28pm

I don't know how much of a purist you're being in regards to components, but the Tree Sloth plug-in I wrote has a list comparison component that's really useful when you want to compare items against each other in a given list. You can choose for it to give all unique combinations, or you can set it to create for each object a data branch that matches it against every other one. So:





will return:


A - B

A - C


B - A

B - C


C - A

C - B

So if you had a branch with all the struts from each node, you could easily test and sort all of the angles for each one against its neighbors. Just an idea!


Members (403)






  • Add Photos
  • View All

© 2021   Created by Scott Davidson.   Powered by

Badges  |  Report an Issue  |  Terms of Service