Tutorial: Grasshopper interface and basic operations

Grasshopper, which is gaining immerse popularity within certain design disciplines, is a generative design and modeling plugin for Rhinoceros 3D. It can also be used to add parametric control to Rhino 3D models. As of this writing, it can be downloaded freely from http://www.rhino3d.com/download/grasshopper/1.0/wip. Studiorola offers Basic Grasshopper for Rhino 3D Training (In Singapore).

This tutorial explores the software interface of Grasshopper. To be able to follow this tutorial well, the Reader will need to have a basic proficiency of Rhinoceros, the popular, user-friendly and amazing NURBS 3D modelling program.

The interface layout and its elements are as shown below.

grasshopper rhino

 

 

 

 

 

 

 

 

 

 

Typical Workflow
Typically, the workflow follows the following steps as described below:

1. At Rhino command prompt, execute Grasshopper command. This will open up the Grasshopper window.
2. Add components onto the canvas
3. Drag connectors from output sockets to input sockets to establish the connections.

Anatomy of a Node

The left side sockets are for receiving inputs; whereas the right side sockets are for downstreaming outputs.

grass2

 

 

 

 

 

 

 

 

Colours of node and their corresponding meanings

Orange – with warnings

Green – is selected

Light Grey – no warning or errors

Darker grey- preview is disable

Greyed out – has been disabled

Red – has errors

Basic Operations

There are 2 methods of adding components onto the canvas

Method 1: Drag a new component onto the canvas
Method 2: Double click on the canvas to bring up the keyword search box.

grasshopper canvas

 

 

 

 

 

 

To disconnect from a socket, right-mouse click, select Disconnect.

grasshopper3

 

 

 

 

 

 

 

 

To connect to a socket which already has an existing connection, press and hold the SHIFT key

grasshopper4

 

 

 

 

 

 

 

To copy Node, drag the component and press the Alt key.

Data Input methods

Generally, data can be from the following sources:

1. Referenced from Rhino objects
2. Assign values for component

Saving Grasshopper Definition
The algorithms that are built in Grasshopper are referred to generally as definitions. To
save a definition in Grasshopper, go to File > Save or File Save As commands.
A Grasshopper definition can be saved in 2 formats:

1. .gh format is for Grasshopper binary
2. .ghx format for Grasshopper XML.

.gh is the default format.

Converting to Rhino surfaces – Bake surfaces
To convert Grasshopper previews into geometry that’s editable in Rhino, we need to
use the bake command.
To do that, hover cursor over component whose geometry you’d like to convert in to
editable geometry. Right click and select Bake.

grasshopper5

 

 

 

 

 

 

 

That is all for a very simple and basic intro. Hope that it is useful for you starting on using Grasshopper.

 

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