First time my max/msp/jitter issues can’t seem to be solved by simply searching this great forum, so here it goes…

I want to import an .obj 3d model (relatively simple surfaces, no texturing) in Jitter, modulate it by data extracted from audio sample analysis and export the resulting shape to have it 3d-printed.

My problem is in the last step: exporting. The jit.gl objects don’t seem to have any means of exporting to for example an obj file. Has anyone found a workaround?

Vade suggested I could parse the output of my jit.gl objects with @matrixoutput 1, save as a Jitter binary file and parse/convert to a 3d app readable format. Theoretically feasible but I probably can’t work this out in the given timeframe. Any other ideas?

Additionally, the surfaces I’d like to work with are nurbs but I understood Jitter can only import tesselated models. I could live with it but nurbs would be better. Any workarounds for that?

Thanks, Dieter

I wrote a javascript that exports obj files from a matrix in jitter. I attached you an archive containing the script as well as a demo patch, which should demonstrate the use of the script.

Basically it just receives a jit_matrix and writes its contents into an obj file. If you need you can also define groups and materials for your object.

If you need any further explanation please feel free to contact me.

stephan

I am glad I found this post. I am looking to do a similar project with max.
I have a couple of questions for the two of you.

Dieter, 1. how has your project progressed?
2. how much clean up did you have to do with your OBJ file before you converted to STL?

Stephan, 1. I have downloaded your zip but have not opened it yet, can the exporter work with jit.gl.sketch or does one need an object file to start with?

I am excited to read that others are working on this!

Erika

grtz dieter

really cool patch.
but one question: is there a way of reading a “obj.” back to your patch? the
idea would be to draw it using “line” or “line-strip”, etc and saving it
like that.
any clues?

sandroid

On Thu, Feb 14, 2008 at 6:15 PM, spray wrote:

> Hi Dieter,
>
> I wrote a javascript that exports obj files from a matrix in jitter. I
> attached you an archive containing the script as well as a demo patch, which
> should demonstrate the use of the script.
>
> Basically it just receives a jit_matrix and writes its contents into an obj
> file. If you need you can also define groups and materials for your object.
>
> If you need any further explanation please feel free to contact me.
>
>
> stephan
>
>
>

–
Sandro Canavezzi de Abreu

I would appreciate it greatly if you could send me one of your nurbs patches, maybe it will be easier to understand to see how you worked it.

I am on a macbook pro OS 10.4.11 running MAX/MSP/JItter 4.6 jitter 1.6.3

best
Erika

By plunking in jit.gl.nurbs in place of gridshape, in Stephan’s patch I can get my nurbs object exported. I still have to figure out exactly if I can make the shape I want in nurbs, I am trying to draw a series of lines to make a shape almost like a nest. I did want to start from scratch that is why I wanted to use gl.sketch but I cannot figure out how to send my sketch data out to the matrix, I know that i have to use the glcommands but ????
still working I will post my patch soon if anyone wants to look at it.

Sandro, I think I am running into the same problem with the objects
I dont know if this helps but what I have been doing is exporting the object then using meshlab to look at my files, but they stay as solids even if i change the primitives for the objects. Again that is why I wanted to do it in gl.sketch

can one draw multiple lines in nurbs?

great tool, I was about to try and make it, so glad someone told me this was here. I added those words at the top of this message so that it would come up if someone searches export OBJ 3d mesh like I did. I searched a few times and for some reason nothing came up, and it was because I didn’t say export 3d “MODEL”

at any rate, this is awesome, I cant wait to render out some of my jitter stuff in high res, or make a version of this that will do whole obj animation sequences!!

thanks so much!!

Thank you!!

Tonko

-Ben

I’m also working on a similar problem,

I want to export the XYZ data from jit.gl.gridshape as a text file by using jit.fprint and I’m having some issues

I’ve attached a max patcher from max5 as an example

I’m going to be working on this problem further and posting the solution if I can find it, any help would be appreciated

It was to do with carriage returns VS “line feed” , sending the message 10 to itoa to use a line feed was the answer

After a frustrated waste of time trying to get an old c external of mine to work properly (trying to use glFeedbackBuffer – long story, everything coming out, but flat!) and now running out of time i’ve now switched to making some changes to jsobjwriter.js to fit what i need – specifically scaling, positioning (easy, done) and rotation (more chewy, working on it!)

I’ll share back the results here when done, but was just wondering if anyone had already done this – or can point to how to get the jit.gl.model objects i’m using to output the matrix with these transforms already on? (in which case i may be sick! ;)

Thanks

jonny

My workaround to getting scaling, positioning & rotating was to just measure where the object was then add all of that to the matrix to offset it

I’ve attached an example to show what Im talking about, you could do the same in javascript if you needed

let me know what you come up with