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 Carlos Pérez on September 12, 2013 at 2:15am

Hi Luis,


The download should work fine now at food4Rhino, sorry for the inconveniences.

Comment by Luis Fraguada on September 12, 2013 at 1:27am

Hello all that are having issues downloading gHowl from  I have contacted the site's admins to try and fix the issue.  I have changed nothing, and the issue is not from me, it is how the site handles links.  Let's see if we can fix it.  If you need to have the file, please send me a message here or on food4rhino and I will personally send you the necessary files.



Comment by Ye Yuan on September 5, 2013 at 5:12am

Hi, guys. Does anyone know how to download GHowl now? Cuz the link on food4rhino cannot be downloaded. Thanks a lot!

Comment by Naphat Chongratanakul on August 16, 2013 at 4:26am

Hi all,

I have been working on CA in processing and sending coordinates to GH for network analysis. Everything is working fine until the data that I send to gHowl get too large and I receive an error message

ERROR @ UdpClient.send ioexception while sending packet.

How can I resolve it?

Comment by WillemDerks on May 18, 2013 at 9:29am

Thank you very much Djordje!

Comment by WillemDerks on May 18, 2013 at 7:24am
Alternative download location?
Hi is there a known alternative download link other than via Food4Rhino? I'm unable to register at that site as promised confirmation emails are not send.

Comment by George L on April 17, 2013 at 5:07am


Hi Luis I have created a new thread with the question.

Url Link:

Comment by Luis Fraguada on April 17, 2013 at 12:50am


Yes, but I still do not understand. The attraction and deformation is calculated in Grasshopper?  What are you doing in processing?

In general, you should open a new thread to deal with specific questions as the comments area is not the greates for following up on a topic.

Comment by Rodrigo Romero on April 16, 2013 at 5:43pm

Hi Luis,

i´m attaching the definition i made, i already used the OSC dispatch to collect the data, but data transmission seems to be super slow, does this have to do with the capacity of the wifi network?

the definition is a bit messy, it´s a multiple copy paste from different definitions i found

Comment by George L on April 16, 2013 at 4:51pm


I want to send the deformed points but also an attractor point that affects the points dynamically so when attractor changes position, the points are also affected.


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