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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This Grasshopper definition uses a grid of points to generate a series of curves that respond to an attractor point.  This definition is a great example of using really simple and basic concepts of parametrics to accomplish a more complicated goal.  Essentially, all this definition is composed of is an attractor point that adjusts the curvature of a plane and an attractor point that adjusts the radius of circles that are projected onto that surface.  The small bit of vbscript at the end is used to split the circles from the surface.

Note:Version of Grasshopper Needed-(Grasshopper 0.6.0019)

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