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.

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: 1631
Latest Activity: yesterday

Discussion Forum

Distributed points on surface 4 Replies

I'm sure I will kick myself but..I've made a simple definition to create points on a surface.  Then using power law forces between all the points and pull to surface.Working perfectly on a sphere:…Continue

Started by Harri. Last reply by zhougang Jul 9.

PointLine force 5 Replies

I'm desperate guys.I have been trying for weeks to use correctly the function PointLine in Kangaroo, but does not work in any way. Please give me an example or a file that will show it doing something, I need this type of force so much.I've looked…Continue

Tags: Kangaroo, PointLine

Started by Francesco di Niccolo. Last reply by Robert Vier Jun 30.

increase the processing power of Kangaroo/GH

Dear Daniel, During processing some calculation with kangaroo I noticed that I have problem with my Computer In case of a retractable roof, by dynamic relaxation it works in generally fine with few elements (e.g. only fabric between 2 radial cable).…Continue

Tags: performance, power, processing, kangaroo

Started by Frank Jun 27.

Gridshell / Formfinding 12 Replies

Hi !I am trying to implement in Grasshopper the propose method by Kuijvenhoven and Hoogenboom in this article :…Continue

Tags: hoogenboom, kuijvenhoven, formfinding, gridshell

Started by Jean-Baptiste Le Guen. Last reply by Jean-Baptiste Le Guen Jun 26.

Freeform tensegrity 2 Replies

Seeing the great work of Kosuke Nagata and Piotr Kluszczyński with tensegrity…Continue

Started by Daniel Piker. Last reply by Daniel Piker Jun 17.

New origami example 25 Replies

Origami_simplified.ghThis example shows the use of the new user object…Continue

Started by Daniel Piker. Last reply by esmaeil mottaghi Jun 12.

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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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

121115%20TANGENT%20CIRCLE.gh

121115%20TRIAL%20SURFACE.3dm

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

Nick

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.

Dan

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

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

Adam,

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 file...SimulationLooping.gh

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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