Grasshopper

algorithmic modeling for Rhino

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Kangaroo

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

Read about the new release here

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

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

Website: http://kangaroo3d.com
Members: 2614
Latest Activity: yesterday

You can read an introduction to the ideas behind Kangaroo here:

http://spacesymmetrystructure.wordpress.com/2010/01/21/kangaroo/

Kangaroo2 is now available for testing (see full announcement here). Please bear in mind this is still a work-in-progress, and features are still subject to change.

You can download it from here:

http://www.food4rhino.com/project/kangaroo

This thread contains some troubleshooting tips if you have problems getting it installed and working:

http://www.grasshopper3d.com/group/kangaroo/forum/topics/kangaroo-2

The main source of example files for the latest version is here:

https://github.com/Dan-Piker/Kangaroo-examples

Some further example files for version 2.0 can be found here:

http://www.grasshopper3d.com/group/kangaroo/page/kangaroo2-additional-examples

with more to follow - if there is some particular feature you would like more examples of information on please ask there.

The Kangaroo2 solver library is now separate from the Grasshopper components, and can also be referenced and used in scripts, either in the GH VB/C#/Python components, or in RhinoScript/PythonScript in Rhino. Questions about these can also be posted on:

http://discourse.mcneel.com/c/scripting

Kangaroo2 is a complete rewrite, and the main solver/goal/force components are not cross-compatible with the previous version. However, you can keep both versions installed together allowing older definitions to be opened, and for now this is recommended, as there are also several utility and mesh processing functions relevant to both versions.

While v2 introduces many new features and improvements, not all the features from the old version currently have equivalents in the new version, but the plan is to add them all over time.

The links below are for the old version. More documentation and videos for the new version to appear soon.

example files(for version 0.099):

http://www.grasshopper3d.com/group/kangaroo/page/example-files

manual(for version 0.099):

http://docs.google.com/View?id=ddpv

getting started video:

http://vimeo.com/20308963

demo videos:

http://vimeo.com/album/199263

Some more tutorial videos from EXLAB:

http://vimeo.com/exlab/videos

Discussion Forum

Custom goal behavior

I've created a custom goal in Kangaroo 2 which applies a force in a direction defined relative to the current orientation of a rigid point set. The idea is that it should function like a rocket engine.In order to test it, I've anchored the points in…Continue

Started by Evan Buttemer on Thursday.

Kangaroo 2 solver not working: "1. Solution exception:Method not found: 'Int32 KangarooSolver.PhysicalSystem.GetIterations()'." 4 Replies

Hello,I get this message from the solvers on installing Kangaroo 2. Does anyone know what it means?Thanks,KevinContinue

Started by kevin walsh. Last reply by kevin walsh Nov 13.

Goal source code examples 11 Replies

Over the last year it has been great to see an increasing number of people start to script their own custom goals for Kangaroo2.To help with this I have just open sourced most of the code for the actual goals that are included as components in the…Continue

Tags: Kangaroo

Started by Daniel Piker. Last reply by Jens Pedersen Nov 11.

How to find current forces applied to particles 1 Reply

When a system has goals still trying to move particles, but has reached equilibrium, I'd like to gather information about what forces are being applied on each particle by each goal. Is there a way to query the solver for this? I imagine it's right…Continue

Started by Cory. Last reply by Daniel Piker Nov 7.

LenghtSnap to list of values 7 Replies

Hi Guys, With Kangaroo2 I'm looking for a way to apply a spring force where the rest length can be one of several values. Just like LengthSnap but with distinct values as opposed to multiples of a base value. Can anyone think of a solution?SimonContinue

Tags: kangaroo

Started by Simon Vorhammer. Last reply by Simon Vorhammer Nov 3.

How to maintain order of point list after Kangaroo solver?

Hey guys,I ran into a problem which I don't know how to solve.I'm inputting a list of points as particles on which various forces act, and I need them to be in the same order as the original point list, as each particle has additional, unique…Continue

Tags: after, list, list order, maintain, kangaroo

Started by Taole Chen Nov 3.

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 […]

MeshMash!

      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

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

Comment by Jesper Hildebrandt Andersen on April 22, 2015 at 5:50am

I get this error from the solver, guess it something net frame something any idea on how to solve it ?

Solution exception:Method not found: 'Int32 System.Environment.get_CurrentManagedThreadId()'.

Comment by Andrei Raducanu on April 18, 2015 at 5:59pm

Can Galapagos wait for the final result of kangaroo after making a slider change?

Comment by nick Traverse on March 8, 2015 at 5:00pm

Hi Everyone,

I'm working on/ studying reciprocal structures. I'm trying to develop this script to fabricate reciprocal stick models using no connection method, just the sticks/pipes resting on each other.

The problem is when I run the Kangaroo engine, there are some issues with the layering of the pipes. As you can see in the image, the green pipe is supported, however the red pipe isn't. This would be okay if I was planning to implement some sort of connection, but because I am working on creating a structure where they just rest on each other, this is no good. 

Any help or insight on this would be great,

thanks!!!

File>>> dynamic%20reciprocal%20cleanup.gh

Comment by M.Elsayed on March 2, 2015 at 4:22pm

Boxes collide in limited space.

I need to make a collision between five boxes in  limited boundaries  with allowance of changing in size and dimensions for each box by 80 percent. Any Ideas or even sample file close to this issue.

Comment by andres obregon on November 4, 2014 at 3:07pm

Question about Kangaroo. It is possible to simulate a balloon filled with water in air, on a horizontal plane , self-weight forces? Thanks ...

Comment by Michael Makris on October 30, 2014 at 2:29pm

Quick question about the "new" Zombie component. How is Zombie Kangaroo different from just using a Sequence component to control Kangaroo Reset?

Comment by S.Sifakis on May 20, 2014 at 1:11pm

Hello Daniel,

I am trying to inflate 4 balloons within a box which itself also inflates. I would like to constraint the balloons inside the box but it is not working. The external surface of the inflatable object collide with the exterior surface of other objects but not the exterior with the interior. Is there something wrong with my definition or there is another way to do it?

Any help on this matter would be really appreciated since it is part of my thesis project!!

Thanks!!!! :) mesh_sphere_balloon4.gh

Comment by Luis García Lara on April 17, 2014 at 9:05am

Hi Daniel,

i'm having an error using KingKong plug-in, this error come from the kangaroo cluster, I think it's for the change of the hinge component in the last update of kangaroo, i'm wondering if someone can share the password for update the cluster?¿ or update the cluster and share again for continue using this nice plug-in?¿

http://www.grasshopper3d.com/group/kingkong/forum/topics/hinge-erro...

Thanks

Comment by S.Sifakis on April 17, 2014 at 5:32am

Hello,

I am trying to create constaint on  an inflattable mesh by using a curve as a spring. I used the mesh collide  component in order to deform the mesh following the curve as a constraint but the mesh doesn't seem to recognize it. I am working on the file that originated from this discussion.
http://www.grasshopper3d.com/group/kangaroo/forum/topics/simulating...
Any help would be appreciated

Sandra

inflatetriangulatedmesh_test_spring.ghx

inflateatriangulatedmesh_test_spring.3dm

Comment by Aurea Botelho on April 17, 2014 at 5:23am

I have uploaded Kangaroo and it's not working at all :/

 
 
 

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