Grasshopper

Grasshopper is a parametric modelling module/plugin for the 3D modelling software Rhino.

Grasshopper currently only runs on Windows.

1. Boot into Windows.

2. Open Rhino

Click on the start menu and type “rhino”.

 

3. Run Grasshopper

Type “Grasshopper” into the command field in Rhino

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4. Draw a curve

In the “Top” view of Rhino, draw a simple control point curve. Press enter to finish the curve.

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5. Create a new Grasshopper document

In the Grasshopper window, click File, New.

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6. Insert an “Offset Curve” node

Double click in the Grasshopper document working area (the large gray grid underneath the buttons)

Type “Offset” into the text field

A list of nodes will come up, select the “Offset curve” node as shown below:

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the node should look like this:

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and add a grid to the Rhino view:

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7. Set the curve

Now insert a “Curve” node, use the set curve, it looks like this:

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now select the curve you have drawn in Rhino:

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and right click on the curve node in grasshopper, select “Set one curve”

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8. Connect the nodes

Now drag the output of the curve node into the curve input of the offset node:

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rhino will preview the offset in red like this:

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9. Alter the Offset amount

Add a “Number Slider” node to grasshopper:

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link the slider to the “Distance” input of the offset node:

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slide the slider, look at the preview in Rhino (the offset line should change position)

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10. Play around

Here I’ve added some different nodes “Divide Curve”, “Vector XYZ”, “Extrude Point” and another number slider, and combined them like this :

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I’ve also changed the maximum value of the number sliders to 100.

Right click on the number slider node and alter the max value:

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the resulting mesh is a little crazy and the start of something interesting.

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11. Bake the grasshopper preview

Right click on what you want as a mesh, in this case it’s the

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Last modified: September 15, 2014