gHowl

Information

gHowl is a set of components which extend Grasshopper's ability to communicate and exchange information with other applications and physical devices.

Website: http://www.grasshopper3d.com/group/ghowl
Location: In Between
Members: 976
Latest Activity: Feb 5

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:

Processing

Excel

Open Office

RSS

Arduino

Kinect

Reactivision

openFrameworks

Google Earth

Resolume

VVVV

Pure Data

max/msp

Maya

Kangaroo

TouchOSC

iPhone

Android

Components:

UDP:

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 224.0.0.0 - 239.255.255.255.

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.

Spreadsheet:
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.

XML:
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

GEO:

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:

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.

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Comment Wall

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Comment by Luis Fraguada on May 9, 2012 at 1:45am: To note, an OSC Bundle is different than an OSC Packet. An OSC bundle comes across to GH as a list of values where as an OSC packet would be sending one value (one string or one number for example). You could do one OSC packet as a string, or an OSC Bundle which would be deserialized as a list in GH (at least that is how I thought I coded it, it needs to be tested!).

Comment by Constantinos Miltiadis on May 8, 2012 at 4:32pm: i'll try again in OSC, to pack everything in a single string

thanks ;)

Comment by Luis Fraguada on May 8, 2012 at 4:28pm: hmm, In this case I might consider sending a packet with all of the control point positions. You could check in GH if the control pt position has changed, if it has, update the position. In UDP you could send a comma-delimited string, maybe if you want to keep it in OSC you could consider sending an OSC Bundle.

Comment by Constantinos Miltiadis on May 8, 2012 at 4:07pm: another example of processing>GH via OSC, for a kinetic spacegrid structure simulation.

http://www.youtube.com/watch?v=zdqsBtYTC94&feature=youtu.be&...

and at my blog:

http://at-nowhere.tumblr.com/post/22669358307/kinetic-canopy

though I have same receptibility problems when sending multiple (2) streams of data to GH.(i don't know what is the problem maybe its something like a buffer stuck) and i have to do some manipulations.

do you think that UDP would be a better way?

Comment by Luis Fraguada on May 1, 2012 at 1:33pm: Hello dd,

Evert Amador discovered this issue on the processing side. For reference, you can check his code here: http://www.grasshopper3d.com/group/ghowl/forum/topics/udp-problem

The issue is in two lines of code. For the setup you should have (assuming you have a UDP object called 'udps'):

void setup() {
udps = new UDP(this);

...

}

and then for the sending:

udps.send( message, null, port );

Hope this helps!

Comment by dd on May 1, 2012 at 6:56am: Hi Luis,

Is it possible for me to email the script to you instead? So I would be glad for you to give me your email id.

Di

Comment by Luis Fraguada on May 1, 2012 at 5:50am: Ok, I will need to see what your processing looks like in order to help you further...

Comment by dd on May 1, 2012 at 5:45am: Hi Luis,

Thanks for reply.I tried the examples and they worked.But when I code the lines into my processing, the error appears.

Di

Comment by Luis Fraguada on May 1, 2012 at 4:36am: Hello dd,

I would need to see how you are coding in Processing. Have you tried the examples? Are they working for you?

Comment by dd on May 1, 2012 at 3:38am: Hi Guys,

I'm new to grasshopper and I am attempting to link Processing to Grasshopper via Ghowl.

but I have a problem that I couldn't figure out:

opening socket failed!
> address:null, port:6005 [group:null]
> Address already in use: Cannot bind

This is the error which appears in processing.Can you help me to figure it out?

Cheers,

DD