For those who don’t know, hoopsnake is a component for grasshopper that allows the user to perform recursive operations. This has been consistently on the wishlist for features within grasshopper. This is the first time I’ve been able to experiment with the new component. You can download the new component along with a large amount of tutorial files to help you get off the ground at http://www.volatileprototypes.com/projects/hoopsnake/.

My exploration focuses on the base features. It takes a starting value adds to it consistently until it reaches a limit threshold set in my initial variables. These values are used as seeds to generate a varying topology that is then confined and split from a box. The result is a continuous list of varied objects. The benefit being that now I can filter down the list to desirable solutions.

Download Mesh Form Generator

Note:Version of Grasshopper Used-(Grasshopper 0.8.0063)

Version of HoopSnake Used-(HoopSnake 0.6.1)

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This is the final product of our interconnected wall experiment, minus the interconnecting bit.  Due to time and access to the router this was the most that could be completed.  The process after it was cut on the router involved many layers and was very time-consuming.  The piece was cut twice, the front and back, these portions were glued together to achieve a two-sided form.  It was necessary to cut out the holes by hand and then sand smooth, for a clean finish.  Any notches or uneven edges were spackled, sanded, and then a final coat of paint was applied.  It was framed with pine 1×4 and trim, the whole frame was stained and a final coat of polyurethane was applied.

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This definition is very simple, but incredibly useful.  It sorts a series of points based on distance and then creates connections based on that list.  The only slider in the definition is used to control the number of connections that are allowed.  The purpose of the definition being that it optimizes the placement of connections.

Connecting Points Grasshopper File

Note:Version of Grasshopper Used-(Grasshopper 0.6.0059)

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The interconnected wall stems from work originally proposed by Erwin Hauer, this example has been reworked in grasshopper and tested physically on a cnc milling machine. The definition is used to design panels which do not collide with each other.  It uses curves taken from rhino space to sweep2 a surface.  This surface is extruded; which creates a closed brep that is suitable for a difference component.  A cylinder is subtracted, then the piece is rotated 180 degrees to face the previous piece.  In this stage it is important to make sure that no edges are colliding, this can be done by adjusting either the curves or the radius of the cylinder.  My dimensions responded to the fact that I was cutting the object out of 2″ insulation foam, but all of the dimension can be controlled in the definition.

Interconnected Loop Tile Grasshopper File

Note:Version of Grasshopper Used-(Grasshopper 0.6.0059)

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In my previous articles, my exploration of flocking has remained in the realm of a diagram.  This iteration is the first step in taking those conceptual thoughts and brining them to a more architectural level.   My previous diagrams generated a logic.  The logic consisted of a series of points that responded to one another and a series of vectors attached to those points.  The next step I took was in aggregating those collections of points.

The aggregations involved connecting the spheres of flocking’s origin points.  After the aggregation each of the flocks was connected to the next via a poly-line.  Those lines were the divided to create points, these points were affected by the semi circles, which effectively represent spheres of influence.  The points are then turned into floor plates.

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These are the iterations of the previously discussed grasshopper definition.  The system on the left has its ratios(see first article) set to change at each iteration starting at .3 moving towards .8 and then returning to .3 at even intervals.  The system on the right is used as a control it is permanently set to .5.  All of these itterations stem from an understanding of flocking, researched from Craig Reynold’s original algorithm.  For a better understanding I would recommend that people start there, Craig has very simple rules that explain the processes that are occurring.

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Flocking is the subtle organization of part to part relationships. One of the most common examples of this is obviously flocks of birds, such as the starlings at Otmoor(see video after the break). Flocking in that case consists of a couple elements. The first being clustering of parts, so these parts are forming a spatial relationship of proximity. The next being a correspondence to average heading, each of those starlings not only react to the spatial field of the others, but also to the direction in which they are headed. The final element is a collection of average mass, this is almost a example of part to whole, except for the fact that it is less a reaction and more of a product generated by the first two rules. The starlings as a field of objects generate an emergent condition, the first two elements are a reaction, while the center of mass is something else entirely it is an emergent product generated through the complexity of the system.

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