algorithmic modeling for Rhino



gHowl is a set of components which extend Grasshopper's ability to communicate and exchange information with other applications and physical devices.

Location: In Between
Members: 965
Latest Activity: Aug 8

Download the latest set of gHowl components:

gHowl_r50 and example files


Check out the gHowl videos page where you can see how people have been using gHowl.

Our users have connected Rhino and Grasshopper to various protocols, platforms, and softwares including:



Open Office






Google Earth



Pure Data










UDP Components now have the ability to send and receive to a Multicast group.  To send or receive to a Multicast group, make sure you use the IP Range of -

OSC functionality is provided by the Bespoke OSC Library by Paul Varcholik.

Network Source
- Tests the connection of your machine to a network.

UDP Send - Allows the sending of UDP messages over the network.  Also allows the sending of OSC messages to OSC enabled software and hardware devices. (Deleting this component in 0.7.0057 crashes GH / Rhino)

UDP Receive - Allows the sending and receiving of UDP messages.  Also allows the reception of OSC messages and bundles (from Reactivision for example).(Deleting this component in 0.7.0057 crashes GH / Rhino)

OSC Channel - This component allows the storage of a single OSC Channel.  Change the component's nickname to store that address' data.

OSC Dispatch - This component allows the storage of data from multiple OSC addresses.

The spreadsheet components leverage the OpenXML engine.  You must have OpenXMLSDKV2.msi installed in order for these components to work.  These components read and write *.xlsx files.  Supports numerical values and strings.

Spreadsheet Reader - Retrieves spreadsheet data from a file stored on your computer.

Spreadsheet Writer - Allows you to write a spreadsheet file.

These components retrieve xml data from local and web sources (such as RSS feeds).

Pachube - Retrieves data from a Pachube feed.  Must have a valid Pachube API. (Deleting this component after making a connection in 0.7.0057 crashes GH / Rhino)

Pachube Update - Allows you to update a Pachube Feed.  The component has variable inputs to enable streaming to various datastreams.  Must have a valid Pachube API.

XML Parser - This component parses an XML file stored on your computer or on the web.

XML Writer - Writes out XML




These components aid in the mapping and conversion of coordinates from GPS enabled devices to XYZ coordinates.

Format GEO - Takes NMEA formatted GPS coordinates and converts them to Decimal Degrees.

XYZ -> GEO - Maps XYZ coordinates in Rhino/Grasshopper to Longitude, Latitude, and Altitude.

GPS -> GEO - Maps Longitude, Latitude, and Altitude coordinates to XYZ

Elevation Service - This component returns the elevation at the coordinates you supply as inputs.  It queries the Google Elevations API to do this.  There are some limitations on usage, so be warned.



KML Exporter - Exports points, curves, and meshes to a KML File.  Breps should be meshed before exporting.  Brep support will be added soon.  Object attributes such as color, transparency, line width, line color, etc will be added soon.

KML Attributes - Adds Fill Color, Line Color, and Line Width to Exported KML Objects.

Discussion Forum

Processing to Grasshopper

Hello,I have a processing scripting that want to take it to grasshopper and would like to connect it live. I was wondering if anyone can help. I know ghowl is the way to do it and I tried and kind of…Continue

Started by Bahar sh Aug 8.

Android OSCmessage to GHowl. Error Message. 5 Replies

Hello all,I am writing an android interface to communicate with grasshopper.  It's the same idea as some of the OSC apps in the app store, but they aren't open source and I need to be able to have…Continue

Tags: java, osc, udp, ghowl, android

Started by Jon Blout. Last reply by YUAN SHENG LIN Mar 14.

Altitudes are all zero

Hi, I am new to grasshopper and I found this plugin useful! But I am not sure why the…Continue

Started by Julia Law Oct 16, 2018.

UDP Send/Receive from Grasshopper to Processing 11 Replies

Hello guys,I have manage to send and receive one value from Grasshopper to Processing and convert it to float. Now I'm trying to send multiple values from grasshopper to processing and store it to an…Continue

Tags: Send/Receive, String, Split, UDP

Started by George L. Last reply by vapeur May 30, 2018.

Comment Wall


You need to be a member of gHowl to add comments!

Comment by Rodrigo Medina on December 2, 2010 at 5:12pm
@Luis Fraguada hi Luis you´re right I did´t with processing because I wanted to use the information of some points I had in a Sketch in processing Saludos !!
Comment by Jack Dodgson on December 2, 2010 at 5:05pm
Hello, I am trying to incorporate ghowl into a definition that uses a VB component with a timer, and i am noticing that the incoming UPD packets are calling all other components in the definition. As a result the component is reading/writing files many times a second as opposed to once every 5 seconds. Any Ideas?
btw well done on ghowl, it is an invaluable add on to GH.
Comment by Luis Fraguada on November 27, 2010 at 10:39am
Rodrigo, why go through processing? The gHowl receiver can directly get OSC data without having to go through processing.
Comment by Rodrigo Medina on November 26, 2010 at 8:14am
@Steve I'm working on that same thing the way I do it was by connecting touchOSC to processing and then processing to Gh3d I'll make a basic tutorial I this perhaps next week I'll let you know
Comment by Steve Fuchs on November 25, 2010 at 12:45pm
Is there a basic tutorial for getting TouchOSC working in GH? At a minimum, I'd like to control a few sliders from my iPhone. *total noob*
Comment by javier zaratiegui on November 18, 2010 at 5:08pm
ole, ole, ole!
Comment by Agnes Tan on October 31, 2010 at 12:01pm
Thanks for the invitation.

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