algorithmic modeling for Rhino



Kangaroo is a Live Physics engine for interactive simulation, optimization and form-finding directly within Grasshopper.

The Discussion Forum below is the best place to ask any questions about using Kangaroo.

(Avoid posting questions on the Comment Wall, as it does not allow organization of replies)

Members: 1653
Latest Activity: 1 hour ago

Discussion Forum

Equalize Angles Component 1 Reply

Hello,Is the EqAng component working as intended?I'm trying to optimize a long chain of springs, so that every segment is bent with the same angle (for manufacturing purposes), without knowing what the "best" angle is:…Continue

Started by David Rasner. Last reply by Daniel Piker Aug 6.

Tafted Panel with Kangaroo Problem

Hi All ! Trying to made tafted panel in kangaroo . stops at the moment with seam line simulation . This stitch has different stiffness index than other mesh panel. I tried to simulate it with second kangaroo definition but it  not coincident with…Continue

Started by Kuznetz Aug 6.

Volume dependant pressure. 2 Replies

Is there an example of the volume dependent pressure in action?I plug the KGas straight into the Force objects on the solver and I get nothing as shown, and the mesh just sinks to the ground, flat as a pancake.:(Please tell me what I am doing wrong.Continue

Started by bobfossil. Last reply by bobfossil Aug 4.

Forces control at each anchor point 2 Replies

Hello everyone! I am preparing a form finding lecture for my architecture students and I want to show few samples using Kangaroo. My question is: How can I control the forces at each anchor point? How can I assign different forces at the anchor…Continue

Tags: control, forces, points, anchor

Started by Romualdo. Last reply by Romualdo Aug 3.

Optimizing for specified edgelengths 8 Replies

Hello everyone!Is it possible with Kangaroo to optimize a certain topology onto a surface, so it has only a few specified edgelengths?The goal would be to not have transition between the edgelengths, but approximate a few specified values as much as…Continue

Tags: length, edgelength, edge, multiple, mesh

Started by sas som. Last reply by sas som Aug 2.

Grasshopper Loading Errors Object: KangarooA (level 1) { Exception has been thrown by the target of an invocation. TargetInvocationException } Object: KangarooA (level 2) { Could not load file 6 Replies

Hi Everyone. Im getting the same errors...Object: KangarooA (level 1) { Exception has been thrown by the target of an invocation. TargetInvocationException }Object: KangarooA (level 2) { Could not load file or assembly 'KangarooLib, Version=,…Continue

Tags: Version=, Culture=neutral, PublicKeyToken=null', 'KangarooLib, assembly

Started by Younggrasshopper. Last reply by Meili Hua Aug 1.

News and Updates

Force polygons of equilibrium structures

I have recently been exploring some reciprocal force diagrams using Kangaroo. From the 1869 paper by James Clerk Maxwell On reciprocal figures, frames and diagrams of forces : …to construct the Polygon of Forces, by drawing in succession lines parallel and proportional to the different forces, each line beginning at the extremity of the last. If the forces acting at the […]

Minimal surface puzzle

The top row shows three different minimal surfaces from the same boundary curves. The bottom row shows the same 3 surfaces rotated and in a different order. Which number corresponds to which letter?

Orthogonal Clustering

I’ve always aimed to make Kangaroo a specifically architectural physics engine. While it shares many characteristics with similar engines used for other purposes, such as games and animation, it has some features that are uniquely suited to designing buildings. Form-finding and physics-based-modelling often result in curved shapes, with an elegant and natural appearance which is something […]

Variation from Uniformity

All of these triangles are identical and equilateral: In architectural geometry over the last few decades, a common topic of research has been how to build and clad doubly curved surfaces in an efficient way. While computer aided manufacturing has made it possible to make buildings where every panel has slightly different dimensions, there are […]


      As regular readers of this blog will know, I’m passionate about the use of relaxation and force-based methods for optimizing geometry in a very interactive way. There is a great variety of form-finding that can be done by assigning physical forces as interactions between sets of particles. However, in my investigations so […]

Comment Wall


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

Comment by PEPE ALGECIRAS on November 15, 2012 at 7:42am

Hi all,

I was trying to make a family of tangent incircles in the mesh but I don´t know what can I do to make it work.

I tried making pairs with each face and its adjacent but it seems to be a wrong way, any hint?

thanks in advance


Comment by M NICK on November 6, 2012 at 4:05pm

Hi Daniel, 

Is there any example for Gridshell Form Finding using Kangaroo?

I am new in Kangaroo and couldn't find any related example to my work.

Thanks a lot


Comment by Daniel Green on October 7, 2012 at 8:24am

Hi Daniel,

I'm a structural engineer and I'm particularly interested in using Kangaroo for form-finding of 'efficient' structures. I was wondering if there is any capability, current or imminent, to deal with rigid bodies (e.g. a bridge deck or pylon) and allow them to interact with the rest of a particle-spring network? I've attempted something similar before but had difficulty moving past particles and forces to rigid elements with rotational inertia and subject to torques.


p.s. top work, this is a fantastic tool.

Comment by Daniel Piker on August 16, 2012 at 3:04pm


It depends what your aim is. This component was originally made just for removing points which were exactly or very near exactly coincident, as a way of making sure spring networks were properly connected at the nodes before simulation.

For these purposes which of 2 almost identical points it took didn't matter, so it always just takes whichever is first in the input order.

If you want more control over how it chooses which of 2 nearby points to keep, such as always choosing the highest, then I'd recommend writing your own script for it.

Comment by Adam Laskowitz on August 16, 2012 at 2:48pm

Daniel, thank you for your response. I am most interested by your last sentence.

For example: if I have a network of points at varying heights. I want to remove points that are redundant in height value surrounding its neighboring points. 

Would you advise I sort the points based on X and Y values such that the order in the list would be successive points.

Also, is there a way to know if a point at (10,10) is begin compared to a point at (11,0)?

Sorry for the detailed questions, just trying to understand if this component can in fact work for me.

Thank you!

Comment by Daniel Piker on August 16, 2012 at 2:42pm

Hi Adam,

The remove duplicate points component works simply as follows:

Given some input points:

- add the first one to a new list

- check if the second point is below the tolerance distance from the first. If it is, ignore it, if not, add it to the list

- check if the 3rd point is below tolerance distance from any of the points already in the list. If not, add it to the list

and so on...

Bear in mind that the results do depend on the order of the input points

Comment by Adam Laskowitz on August 16, 2012 at 11:32am

Hello Kangaroo people. I have a question regarding how a certain component works.

I was trying to create a definition which took a network of points, and reduced the amount of points based on "redundant" values (within a certain tolerance).  I found the "duplicate points" component in Kangaroo which seems to do what I want to do.

I was just wondering though, What exactly does this component do? Mathematically, if anyone knows? Thank you!

I need to be precise in how I am doing these calculations, so I would like to know just how it is working.

Comment by Scott Penman on July 17, 2012 at 11:11am

Arslanov - you can use a timer component in combination with Firefly to do this. Firefly has a component called "data log" which records incoming data. Record the input values and compare the newest one to the previous one - use the output of that (true/false) to determine the state of the Kangaroo engine. You'll also have to attach your timer component to the input values that you're changing. See attached

Comment by Arslanov Timur on June 5, 2012 at 10:31am

Hello. How can I do to Kangaroo reset every time you change the input? That is so that the input parameter "SimulationReset" changed to "true" and whitelist back to "false". And so every time you change the input data. Automatic reset is needed to create an optimization algorithm with the Galapagos.

Comment by first1 on May 3, 2012 at 5:58am

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