8.1. Kangaroo 2

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21. Surface Curve Network

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8.1.21. bending active members: surface curve network

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Date published: August 27, 2022

This exercise derives the eventual surface network that would be reached if all interconnected isocurves of a given surface would aim to straighten themselves out while a few points are kept as fixed anchor points.

This exercise is using Grasshopper version 1.0.0007
References: Daniel Piker, Kangaroo Physics (by Daniel Piker), https://www.food4rhino.com/en/app/kangaroo-physics, Accessed August 6, 2020 

Software

Rhino 

Grasshopper

Plugins

Kangaroo 2

course files

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20. Intersecting Curves

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8.1.20. bending active members: intersecting curves

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Date published: August 27, 2022

DESCRIPTION 

Here, we simulate the effect of a set of intersecting bent curves that want to straighten themselves out. The curves are divided into parts at their intersections to have overlapping Kangaroo particles. These curve segments together try to create a straight line using the bending force.
 
PROCEDURE
1.Find the intersection coordinates for each curve
2.Add the start and end coordinates of each curve
3.Create a sub-curve for each domain segment
4.Divide each sub-curve and merge all division points in one list per curve.

This exercise is using Grasshopper version 1.0.0007
References: Daniel Piker, Kangaroo Physics (by Daniel Piker), https://www.food4rhino.com/en/app/kangaroo-physics, Accessed August 6, 2020 

Software

Rhino 

Grasshopper

Plugins

Kangaroo 2

course files

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19. Single Curve

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8.1.19. bending active members: single curve

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Date published: August 27, 2022

DESCRIPTION 
This exercise explains the “Rod” Goals-Angle component in Kangaroo, which can be used to create a bending and stretching resistant rod, suitable for when designing bending-active structures. To simulate a curve wanting to straighten itself out, an Angle Factor of 0 degrees needs to be applied to a discretised polyline version of that curve. The image shows the transition over time from an original curve into a curve that is “as straight as possible” whilst maintaining the anchor points in place

This exercise is using Grasshopper version 1.0.0007
References: Daniel Piker, Kangaroo Physics (by Daniel Piker), https://www.food4rhino.com/en/app/kangaroo-physics, Accessed August 6, 2020 

Software

Rhino 

Grasshopper

Plugins

Kangaroo 2

course files

BedingActiveMembers_Single_Curve.zip

262.53 KB | 965 downloads

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18. Stretch Analysis

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8.1.18. stretch analysis

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Date published: August 27, 2022

This exercise uses the zombie solver for Kangaroo. This way we get both the original and the processed data as an output from the Kangaroo engine. With the Kangaroo Settings we can control how many sub-iterations have taken place between both states. The difference in length between the original and the final lines gives an indication of the tension present in those elements, allowing us to perform a rudimentary structural analysis.  

PROCEDURE 

1.Run the Kangaroo Zombie Solver  
2.Extract the processed mesh  
3.Compare the original length and the processed length of the mesh 
4.Display the difference in gradient 

This exercise is using Grasshopper version 1.0.0007 
References: Daniel Piker, Kangaroo Physics (by Daniel Piker), https://www.food4rhino.com/en/app/kangaroo-physics, Accessed August 6, 2020 

Software

Rhino 

Grasshopper

Plugins

Kangaroo 2 

course files

Stretch_Analysis.zip

291.58 KB | 891 downloads

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17. Frei Otto’s Edge Bundling

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8.1.17. frei otto’s edge bundling

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Date published: August 27, 2022

DESCRIPTION  

This exercise simulates Frei Otto’s famous wool thread bundling experiment leading to optimised path systems. 

This exercise is using Grasshopper version 1.0.0007 
References: Daniel Piker, Kangaroo Physics (by Daniel Piker), https://www.food4rhino.com/en/app/kangaroo-physics, Accessed August 6, 2020 

Software

Rhino 

Grasshopper

Plugins

Kangaroo 2 

course files

Frei_Otto_Edge_Bundling.zip

281.26 KB | 755 downloads

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16. Tensegrity Simulator

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8.1.16. tensegrity simulator

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Date published: August 27, 2022

DESCRIPTION

This exercise simulates a tensegrity system with cables under tension and sticks under compression.  

PROCEDURE 

1. Use pipeline to extract all curves / points drawn on the respective layers.  
2. Break the tension curves into sub-curves to simulate a chain-like behaviour  
3. Apply length constraint onto the sticks with its original length  
4. Apply a gravity force onto the stick-ends  
5. Apply length constraint onto the cable segments with 0.9 of its original length to create tension  
6. Apply a gravity force onto the ends of the cable segments  
7. Control the paths of the input data by splitting compression from tension elements with two show components  
8. Extract the processed data and pipe the compression elements 

This exercise is using Grasshopper version 1.0.0007 
References: Daniel Piker, Kangaroo Physics (by Daniel Piker), https://www.food4rhino.com/app/kangaroo-physics, Accessed August 6, 2020 

Software

Rhino 

Grasshopper

Plugins

Kangaroo 2 

course files

Tensegrity_Simulator.zip

110.44 KB | 1006 downloads

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15. Inflatables

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8.1.15. inflatables

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Date published: August 27, 2022

DESCRIPTION  

This exercise uses a pressure force to create inflatables. Pressure is a force pushing onto a triangulated face in the direction of the normal vector of that face. 

This exercise is using Grasshopper version 1.0.0007 
References: Daniel Piker, Kangaroo Physics (by Daniel Piker), https://www.food4rhino.com/en/app/kangaroo-physics, Accessed August 6, 2020 

Software

Rhino 

Grasshopper

Plugins

Kangaroo 2 

course files

Inflatables.zip

223.71 KB | 842 downloads

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14. Sphere Collision

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8.1.14. sphere collision

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Date published: August 27, 2022

DESCRIPTION  

This exercise uses two forces to simulate compact sphere packing. One goal force causes all of the spheres to attract each other. Another goal force only activates when the centre points of two spheres are closer to each other than the sphere diameter and makes the centre points repulse each other heavily. 

This exercise is using Grasshopper version 1.0.0007 
References: Daniel Piker, Kangaroo Physics (by Daniel Piker), https://www.food4rhino.com/en/app/kangaroo-physics, Accessed August 6, 2020 

Software

Rhino 

Grasshopper

Plugins

Kangaroo 2 

course files

Sphere_Collision.zip

269.76 KB | 746 downloads

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13. Mesh-Mesh Collision (2)

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8.1.13. mesh-mesh collision (2)

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Date published: August 27, 2022

DESCRIPTION  

Here, Kangaroo 2 is used to simulate the collision effect among two mesh objects. A cube is dropped into a suspended fabric, that aims to keep all cube vertices at the original side of the catching mesh. 

This exercise is using Grasshopper version 1.0.0007 
References: Daniel Piker, Kangaroo Physics (by Daniel Piker), https://www.food4rhino.com/en/app/kangaroo-physics, Accessed August 6, 2020 

Software

Rhino 

Grasshopper

Plugins

Kangaroo 2 

course files

Mesh_Mesh_Collision(2).zip

353.55 KB | 908 downloads

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12. Mesh-Mesh Collision (1)

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8.1.12. mesh-mesh collision (1)

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Date published: August 27, 2022

DESCRIPTION  

This exercise simulates the collision between two meshes, of which one is a cube inflated to become a sphere, and the other a blanket subjected to gravity. Both bounce off the floor.  

PROCEDURE 

1. Keeps a set of points outside or inside a given solid. The solid can be supplied as either a mesh or a Brep 
2. Keeps particles from passing below Z=0 

This exercise is using Grasshopper version 1.0.0007 
References: Daniel Piker, Kangaroo Physics (by Daniel Piker), https://www.food4rhino.com/en/app/kangaroo-physics, Accessed August 6, 2020 

Software

Rhino 

Grasshopper

Plugins

Kangaroo 2 

course files

Mesh_Mesh_Collision(1).zip

294.94 KB | 887 downloads

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