F.2.1.0 ATTRACTOR DEFINITION In this example, we will use an attractor point to orient a grid of circles, based on the vectors between the center points of the circles and the attractor point. Each circle will orient such that it is normal to (facing) the attractor point. 01. Type Ctrl+N in Grasshopper to start a new definition 02. Vector/Grid/Hexagonal - Drag and drop the Hexagonal Grid component onto the canvas 03. Params/Input/Slider - Drag and drop two Numeric Sliders on the canvas 04. Double-click on the first slider and set the following: 05. Name: Cell Radius 06. Rounding: Floating Point 07. Lower Limit: 0.000 08. Upper Limit: 1.000 09. Value: 0.500 10. Double-click on the second slider and set the following: 11. Name: # of Cells 12. Rounding: Integers 13. Lower Limit: 0 14. Upper Limit: 10 15. Value: 10 16. Connect the Number Slider (Cell Radius) to the Size (S) input of the Hexagon Grid component 17. Connect the Number Slider (# of Cells) to the Extent X (Ex) input and the Extent Y (Ey) input of the Hexagon Grid component 18. Curve/Primitive/Circle CNR - Drag and drop a Circle CNR component onto the canvas 19. Connect the Points (P) output of the Hexagon Grid to the Center (C) input of the Circle CNR component 20. Connect the Number Slider (Cell Radius) to the Radius (R) input of the Circle CNR component. 21. Vector/Vector/Vector 2Pt - Drag and Drop the component Vector 2Pt 22. Connect the Points output (P) of the Hexagonal Grid component to the Base Point (A) input of the Vector 2Pt component. 23. Params/Geometry/Point – Drag and Drop the Point component onto the canvas 24. Right-Click the Point component and select set one point. In the model space select where you would like the attractor point to be 25. Connect the Point component to the Tip Point (B) input of the Vector 2Pt component 26. Connect the Vector (V) output of the Vector 2Pt to the Normal (N) input of the Circle CNR component. 27. Curve/Util/Offset – Drag and Drop the Offset Component onto the canvas. 28. Params/Input/Slider - Drag and drop a Numeric Slider on the canvas 29. Double-click on the slider and set the following: 30. Name: Offset Distance 31. Rounding: Floating Point
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F.2 Building Blocks of Algorithms