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: 1564
Latest Activity: 27 minutes ago

Discussion Forum

Where did the Kangaroo Physics Engine Go in V.096? 2 Replies


Started by Michael Roberts. Last reply by Daniel Piker 2 hours ago.

Gridshell form finding solutions? 2 Replies

Hi all. I am fairly new with Kangaroo and currently working on a project that involves a gridshell structure. I have checked everything online for a Grasshopper/ Kangaroo definition and still can't find anything that I understand to work with.…Continue

Started by Maria Touloupou. Last reply by Maria Touloupou on Sunday.

applying forces to mesh

i was wondering if there is a component on kangaroo that creates a force that twists a mesh surface around a helix ? Continue

Started by Mohamed ahmed bargash on Friday.

Quad mesh for a 3D surface

Hi everyone,I have been reading a lot of discussions on meshing surfaces, papers on different meshing techniques (based on curvatures, relaxation, morphing). I'm quite filled with theories and I think I get the big pictue now. Though, I couldn't get…Continue

Tags: Weaverbird, Kangaroo, Surface, 3D, Mesh

Started by Thomas TRINELLE on Thursday.

LineLine demo 1 Reply

Daniel put up this video detailing some lineline interactions a while ago and I needed the 2d collision function but nobody had done a demo of it yet so i somewhat fumbled my way through it.…Continue

Tags: lineline, collision, kangaroo

Started by Kameron Baumgardner. Last reply by Daniel Piker Apr 16.

Periodic boundary conditions with TranslationLock - examples 14 Replies

While Kangaroo is all about applying the laws of physics to digital modelling, there are times when it can be useful to be able to bend these laws a bit.(I've written about some other examples of this before here: …Continue

Started by Daniel Piker. Last reply by panhao Apr 16.

News and Updates

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 […]

dipoles and toroidal vortices


Solitons, Bistable structures and Auxetics

A soliton is a kind of solitary, stable and localised wave which acts in many ways like a particle. They are useful in describing a diverse range of physical phenomena, and their mathematics is a large and active topic of research. One way of demonstrating the idea of solitons is the coupled pendulum model: Imagine a series […]

Comment Wall


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

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
Comment by 哲凌 on March 30, 2012 at 2:01am

hi daniel,

i have a problem of this example file.there's always has sth wrong with the component of spring.I will really appreciate any help.BallCluster_Sequence.ghx


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