Processing to Grasshopper real-time communication

Replies to This Discussion

Permalink Reply by Luis Fraguada on April 27, 2012 at 12:54am

Thank you for sharing this example!  Do you mind if I include it in the next packet of examples I post for gHowl? It is nice to have the points come in as clusters.

One thing, p55 and Rhino treat coordinates a bit differently.  Have you thought of correcting this for visualization?  I just ask cause you mention visualization in your description.  Perhaps fixing the coordinates would make for a more direct viz?  Just a thought.  Anyways, nice example!

Permalink Reply by Constantinos Miltiadis on April 27, 2012 at 3:07am

Of course you can use it Luis.

in the video I show 2 sketches. The first one is the sketch I include. There i did draw these 2 lines, and did some PushMatrix (translate, scale(1,-1)) to make it look like the 4 windows of rhino. I explain that in the sketch file. One other thing is scale. I think most people use rhino in meters, but typical P5 coordinates are two digit at least, so one can put a scaling factor when passing the coordinates to GH. Something like:

string g+="{"+myPoint.x/scale+"," ...and so on

Permalink Reply by Constantinos Miltiadis on April 27, 2012 at 7:22am

Did my answer cover you? or are we talking about different coordinate issues?

Permalink Reply by amir mohebi ashtiani on April 21, 2013 at 5:16am

hi and thx for your help , i have a script on processing that its simulate somekinda substrate pattern i wanna make that pattern on grasshopper can you help me http://www.complexification.net/gallery/machines/substrate/ 
this is the site 

this is the code on processing 

Attachments:

• sketch_130420b.rar, 78 KB

Permalink Reply by Constantinos Miltiadis on April 21, 2013 at 5:22am

you have to get the endpoints of each line and send them to grasshopper.

make a string that carries them , and make them in the form 

{x1,y1,0}*{x2,y2,0)/<next endpoint pair> etc..

then on grasshopper, split what you are getting with "/" to separate the string to pairs, and then with "*" to separate the points

finally make a curve with each pair of points. 

i'll see the sketch later, and tell you more precisely

Permalink Reply by Constantinos Miltiadis on April 21, 2013 at 1:55pm

i cannot open your attachment- access denied

Permalink Reply by David Rutten on April 21, 2013 at 2:15pm

Rar never works on Ning. Please attach files using Zip compression.

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by amir mohebi ashtiani on April 22, 2013 at 12:29pm

sorry for that i didny khnow that , i,ve uploaded the zip file 

Attachments:

• sketch_130420b.zip, 85 KB

Permalink Reply by Constantinos Miltiadis on April 22, 2013 at 2:19pm

got it,

well you'll have to organize your points in lines (from the beginning to the end of the crack) if you want it to be tidy, otherwise you will have some hundred thousands of points in grasshopper > messy

calculate where the lines begin and where they break and send those points.

otherwise, if you want to send all the points make a new global string say

String forGH=""; //generate empty string

then under the line where you draw the crack <point (x1,y1)>

write forGH+="{"+str(x1)+","+str(y1_+",0}"+"&";

so forGH will be a giant string var, that has all your points in the form of {x1,y1,0}&{x2,y2,0)&.....

make a:

void keyPressed(){

if key='O'{

sendStringToGh();

}

}

void sendStringToGh(){

... something like

<new osc message.add (forGH);>

<oscmessage.send();>

}

this way when you press capital O on your keyboard it sends the string to GH

at grasshopper, get the data and feed them to a Split String component, with a panel that contains "&" the character that separates your points.

this will produce a list of points recognizable by GH. if you connect a point parameter their it will produce points, or you could add a circle, or sphere, with your points as centers.

see if it works this way. otherwise calculate the endpoints and send lines with a similar way. you will just need another separation character like

stringtoGH+=startpoint1 & endpoint1 * startpoint2 & endpoint2 *

hope it helps

constantinos

Permalink Reply by Omar Helmy on April 7, 2014 at 9:03am

Hi, thank you for the code, it's a great help to start. But I wanted to ask, can you u send a 1D array with points instead of a 2D array?

And if possible how?

Thanks a million

Permalink Reply by J[D] on February 29, 2016 at 4:20am

Hi all,

Really interesting example. I tested the definition and it's working fine. 

I have a question: If I increase the number of points to send from P5 to GH seems the length of the message is longer than the maximum supported.

Is there any way to bypass this limit?

Thank you.

J