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: 974
Latest Activity: Nov 17, 2022

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

Android OSCmessage to GHowl. Error Message. 7 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 Konstantin Markin Aug 8, 2022.

Ghowl xml import /export 10 Replies

Hey againHow does it work if you want to import and export the same .xml file, when the ghowl xml import has 4 output parameters, and the ghowl export has 2 input parameteres ?RegardsContinue

Tags: export, xml, Ghowl

Started by Jesper Hildebrandt Andersen. Last reply by Hannah Stevens Apr 14, 2021.

external real time data/ parse xml 5 Replies

hello, i am trying this for the first time and hoping someone can point me in the right direction. i am trying to use grasshopper + ghowl to read real time data from a weather site's API.  i have a…Continue

Started by pwdarden. Last reply by Denis Cox Oct 26, 2020.

problem about UDP receiver

Hi, I am using UDP receiver in gHowl. It works well until I packaged everything into a cluster, and the UDP receiver keeps sayting "AddressAlreadyInUse: you might have opened this socket on another…Continue

Started by vapeur Jul 5, 2020.

Comment Wall


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

Comment by Matas Ubarevicius on August 3, 2011 at 7:37am

Hello everyone, new free tutorial on processing/grasshopper integration through gHowl



Comment by Luis Fraguada on June 27, 2011 at 5:01pm

Hello Enrico,

From what I see you have not installed OpenOffice (OOo = False). I recommend downloading the English (US) version and see if that fixes the issue.  In the future, please make a topic above.  Thanks!

Comment by Enrico Casetta on June 24, 2011 at 10:18am

hello everyone!!

I have a little problem with my gHowl input component..

Do someone know a possible solution for it? please see the attached image.


Thank you



Comment by Juanma Sarrió on June 20, 2011 at 2:27pm

Connecting VVVV -> GH about Synesthesia (color -> surface)

Comment by Juanma Sarrió on June 17, 2011 at 5:20am
Scanning a video loop in VVVV sending muuuuultiple data to GH... more news soon...
Comment by Philipp on June 14, 2011 at 12:56am

hey. We just made or installation on VVVV-grasshopper-vvvv using kinect. And using Ghowl, course.


The proplem was with net - your UDP sender and reciever dont wanna work without any wi-fi, on a local computer. We had to make fake network.

also we failed to send udp messages to ммммб had to send just strings. 

Comment by Juanma Sarrió on June 12, 2011 at 10:40am

Connecting Grasshopper (Rhinoceros) + Resolume (VJ).


Comment by Juanma Sarrió on June 4, 2011 at 4:18am

Modifying setup of a webcam in VVVV from Grasshopper (Rhinoceros) via gHwol (OSC).



Comment by Luis Fraguada on June 4, 2011 at 3:05am

Hi Marc,

As I commented in the post above, for UDP sending and receiving to work, the two devices should be on the same network, or there should be a way for the message to travel through different networks.  Mobile devices equipped with 3G are getting data from completely different networks.  In order for these to communicate with grasshopper, we would have to use a different protocol, such as bluetooth.  The bluetoothDesktop library for processing could be used and then the message could be relayed from processing to GH, but this would assume that you have an app on the mobile device transmitting through bluetooth (Touch OSC is not set up for this).


Another way is to allow your mobile phone to create a network, tether your other device to that network.  That way both devices are on the same network...

Comment by Marc Syp on June 3, 2011 at 8:01pm


OK... I discovered that UDP through Verizon data plan just doesn't work... I had to enable my wireless, problem solved.   Just curious, any chance it could work over a data plan as opposed to wireless?


Anyway, looking forward to experimenting.






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