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 Marc Syp on June 3, 2011 at 7:30pm
Hey, trying to test this out but I can't get it working.  Thought maybe it was a firewall issue, so I added some port exceptions inbound and outbound, no luck.   Turned off my firewall entirely for testing purposes, and I'm still not getting any OSC messages through.  Using TouchOSC on Android, putting my computer's auto-detected network IP into the Host field in the TouchOSC app.  Using Simple layout as suggested in the ghx files.  Am I missing something?
Comment by Juanma Sarrió on June 1, 2011 at 4:33pm

Grasshopper + VVVV via OSC (gHwol)


Thx for this amazing plugin developed by Luis Fraguada, Giulio Piacentino and Daniel Alomar.

Comment by Luis Fraguada on May 31, 2011 at 7:08am

Hi Colin,

gHowl is developed completely in RhinoCommon.



Comment by Colin Yip on May 31, 2011 at 6:05am
Hi i was wondering if GHowl has a version for under RhinoCommons ?
Comment by Philipp on May 23, 2011 at 3:04pm

How we can decode UDP message from GH?

VVVV decoder write /gh/none or something about instead of spread

Comment by jose salinas on May 17, 2011 at 7:57am

Hello again,


I would like to know the gps coordinates of a project, but I don't know how it works the converters. Is it possible to explain how it works?


thank you again

Comment by Luis Fraguada on May 2, 2011 at 8:19am
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.

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