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 Luis Fraguada on October 25, 2013 at 5:33am

p.s. you could simulate some data on your own if you have a smartphone of some sort with GPS.  There are many free apps which allow you to track the sensors on the phone as well as the GPS location.  If you get one of those apps, I can help you to modify the example to work with the data that you capture.

Comment by Luis Fraguada on October 25, 2013 at 5:31am

Ah. I see what you mean.  This data was indeed directly captured by the ASKit.  Pachube became Cosm, and now it's called Xively.

I have not tried, but I believe the pachube component still works (need to check that).  It should allow you to get data from that service.  Otherwise, you could use the XML Parse component to read data in from the Xively service.  You will probably need a Xively API key.

The ASKit eventually became the Smart Citizen.  It is actually quite different than the ASKit in terms of how good the hardware is.  I did not work on the Smart Citizen project, but the people that did are great engineers and have made an amazing platform.  Also the web platform is fantastic.  The idea here is not just to collect data, but to create a community of people that are also interested in this.  The Smart Citizen kit is meant to be in a static location, where the ASKit was a mobile kit with GPS.

Comment by davide ventura on October 24, 2013 at 8:34am

hi Luis, I'm referring to the "ImportData" example: in that case you used CPH_data. My question is exist something like a web platform were I can download other data in .csv extension like your CPH_data? For exemple something like pachube where people load own data for exemple monitoring own house etc..I try only to taste this tools, that's all!!   And for I have another question:  did you develop an affordable version of "Askit"?

Comment by Luis Fraguada on October 24, 2013 at 7:26am

Which example are you referring to?  In the gHowl example files, there should be all of the data you need to run the examples...

Comment by davide ventura on October 24, 2013 at 4:05am

Hi martins thanks for your answer. The problem is that I don't have my data because I'dont have any device to monitor and to store data. I'm planning to do do just an exercise downloading data already memorized from other persons in other context. 

Comment by Martin Siegrist on October 24, 2013 at 3:38am

Davide, simply create your own csv file by exporting some data out of excel. Working with csv you'll need the Split Text component in Sets / Text. 

Comment by davide ventura on October 24, 2013 at 3:19am

I'm referring for instance at the Luis's example "Import data", so there are some web site where we can directly download climatic data updated every day (for instance)..I hope to formulate a clear question!

Comment by davide ventura on October 24, 2013 at 3:14am

hello guys, I have a question for you. I'm using gHowl and I'm trying to download some data stored in a .csv file. Do you know some web site where I can find such examples (excel schedule with temperature,co2,moisture I would like to get my personal data but right now I don't have some useful devices.Thank you!

Comment by Luis Fraguada on September 13, 2013 at 2:34pm

Glad to hear it Rasmus.  Would be great to see your thesis.  Also, remember, gHowl has been contributed by myself as well as Giulio Piacentino and Damien Alomar.  Would be great to get other contributors, even if it is just a new example of how to use the toolset.

In any case, glad to hear it was useful!

Comment by Rasmus Petersen on September 12, 2013 at 2:20am

Hey Luis.

Just wanted to say thanks for sharing this wonderful plugin with us all :)
Used it for streaming some points out to excel in my masters thesis.



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