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: 726
Latest Activity: on Monday

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

GDI Error while importing from gHowl???

Dear All,while importing a 2D point array from Processing, I get this message displayed from the gHowl components "a generic error occurred in GDI+" (please see the attached image)Actually the data…Continue

Started by Omar Helmy Apr 6.

Osc receiving data size 5 Replies

Hi Luis, thanks for sharing such great tool. I've got an issue with sending data from processing through osc. Its a huge string that its sopouse to be sent in real time and i'm already been…Continue

Started by Javier Armando Figueroa Escobar. Last reply by Omar Helmy Apr 6.

Latest Version Download Location 4 Replies

I used gHowl for over a year and loved it. I'm on a new computer and need to re-download gHowl for the first time in a while. I was looking for the newest version and want to confirm where it is.On…Continue

Started by Michael Makris. Last reply by Luis Fraguada Mar 8.

.gpx imports through gHowl and Elk 1 Reply

I posted a tutorial on how to position .gpx info in GH through gHowl's Xml Parser and positioning tools.  Enjoy!

Tags: geo-positioning, geo-locating, Elk, gHowl, gpx

Started by Alex Webb. Last reply by Luis Fraguada Feb 13.

Comment Wall


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

Comment by Igor Mitric on November 3, 2011 at 6:42pm

Hallo Luis,

Can you maybe explain a GetElevation option.

Do I need to get familiar with google maps Api pr. and get data from them, and than plug this data to GE node?



Comment by Luis Fraguada on October 14, 2011 at 2:43am

Hello Lauren,

Open Office is not necessary anymore.  Everything you need should be in the gHowl download.  Check out the 'Dependencies' folder for an installer which will enable spreadsheet functionality.  Which version of Rhino/Grasshopper/Windows are you using?

Comment by Lauren Campbell on October 13, 2011 at 1:01pm

I've downloaded Ghowl several times along with the open office and the other thing it says you must have and still can not figure out how to get the components in GH

Any help would be fantastic

Comment by Luis Fraguada on October 5, 2011 at 2:18am

Elise, very cool!  Can you let us know a bit more about this?  Was it as simple as 'plug and play' or did you run into issues along the way?  I wonder how this would operate with multiple users, 10, 100, 1000, etc!  How does the architecture negotiate that information?

Comment by Matas Ubarevicius on October 4, 2011 at 12:34pm
Great work Elise. At the moment I'm writing theory thesis on exactly this kind of interaction ;) That is a ground breaking thing...
Comment by EliseElsacker on October 4, 2011 at 11:11am
Imagine an architecture that reacts on affective, expressive or cognitive signals via Brain Computer Interface Technology
Comment by Luis Fraguada on September 30, 2011 at 10:51am

Two posts by P&A Lab showing Processing connections to Grasshopper via gHowl:

Swarm Cell


Comment by Mirco Bianchini on September 23, 2011 at 11:08am

Loop without script with gHowl

Comment by Luis Fraguada on September 20, 2011 at 1:41pm
Matt, what is your setup?  I would need to know about more about how Kinect sends the multiple skeletons.  Does it make a unique OSC url for each skeleton?  If you can show me what it is that you are receiving through gHowl, I can help to try and get the multiple user skeletons.
Comment by Matt Hunter on September 20, 2011 at 6:53am

Hi Guys,

I am attempting to link OSCeleton to Grasshopper via Ghowl.

OSCeleton is sending skeleton information collected from the kinect sensor through OSC.

I am currently receiving skeleton data for one user using ghowl, but am having trouble accessing data for multiple users.

OSCeleton seems to be sending OSC messages containing skeleton information for multiple users, but it doesn’t seem to be coming through to Ghowl.

Any suggestions would be greatly appreciated.




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