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 April 16, 2013 at 4:45pm: @ George: Please Clarify a bit, you want to deform a torus in GH and send the deformed points to Processing?

@Rodrigo: Check out the OSC Channel and OSC Dispatch components in order to track a specific device / address.

Comment by Rodrigo Romero on April 16, 2013 at 1:55pm: Hi everyone,

Is it possible for the UDP reciever to collect two sets of data at the same time? I have my iPhone connected using OSC (MRMR) and want to use the tactile screen to draw some curves in rhino. I´ve got everything working, but since the reciever only gets one "message" at a time the curves are not smooth (it only records variations in X-axis, then some in the Y-axis and so on..) The result is a jagged line.

Is it a UDP reveiver problem or that the MRMR application can only send one message at a time? GH.jpg

Comment by George L on April 16, 2013 at 5:22am: Hello,

I'm playing around with examples and I've connected grasshopper with processing via UDP.
I'm sending the division points from a torus from grasshopper and I need also to send an attractor point that will transform the previous points so I will have a new list of points.
Should I send the attractor it self or I need to send both attractor and the new list of points to get the expected result?
Any advice or ideas of how I can do this?

Comment by Luis Fraguada on April 8, 2013 at 11:29am: Hello Brandt,

A few hundred feet seems excessive. I'd have to check out the definition to see what is going on.

Best,

Luis

Comment by Brandt Graves on April 7, 2013 at 7:05pm: I have created a CSV file of WGS84 points and other data from GIS and can successfully import the data from a spreadsheet, etc, but in order to combine with other information that is in XYZ, I'm using gHowl to convert the coordinates. The data is mapped very close to an actual .dwg that I've also exported from GIS in order to test it against, but is off by a few hundred feet. Is this typical, or is there a way to improve the accuracy? Perhaps it is the calculation within the node, because when I overlay, it seems that it doesn't quite match there either? Any help would be greatly appreciated.

Comment by Mira Conci on April 1, 2013 at 3:21pm: Works great, thanks.

Comment by John Baker on March 28, 2013 at 9:24pm: I am trying to develop a set-up that allows me to use Grasshopper, Processing, and Galapagos together using GHowl, but have run into a strange issue that I have not been able to solve.

The link between grasshopper and processing using GHowl appears to work fine, but Galapagos is not able to solve correctly. I have noticed that Galapagos associates the Genome with the wrong Fitness. This is noticed when reinstating chosen Genomes.

Here is a link to my files, if anyone has any insight that'd be great! Not sure if its a GHowl/Processing/Galapagos adjustment that is needed. Thanks!

https://www.dropbox.com/sh/bqv4a4ny8i5yav9/SRzkTOuTLp

Comment by Constantinos Miltiadis on December 28, 2012 at 5:38am: hello people,

this is a boid system from processing fed live to grasshopper

do something cool with it

download from here

http://at-nowhere.tumblr.com/post/38904828679/boid-system-to-grassh...