Processing 1.0 - Processing Discourse - New Libraries: OBJ Loader, Google Web API

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Index › Processing Development › Libraries, Tool Development › New Libraries: OBJ Loader, Google Web API

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New Libraries: OBJ Loader, Google Web API (Read 19164 times)

SAITO

Re: New Libraries: OBJ Loader, Google Web API
Reply #15 - Jun 18^th, 2005, 4:52pm

Hmm.. I just tried array definition of OBJModel and it worked.
It would be great if you can give me the source code which does not work in your environment.

this is what i tried for loading a sequence of models.

OBJModel[] models;

models = new OBJModel[10];
for(int i = 0; i < models.length; i++){
models[i] = new OBJModel(this);
models[i].debugMode();
models[i].load("sample"+i+".obj");
}

BlueNinja wrote on May 28^th, 2005, 10:27pm:

Hey Saito,

I have been trying to use the OBJLoader library to creat 3D animations, and I was wondering if it was possible to creat an OBJModel array. I was able to creat an array, but I couldn't figure out how to access member functions.

Also I couldn't seem to creat a OBJModel in a class, and this seemed to be caused by the (this) input. What porpose does it serve in the OBJModel creator

SAITO / tatsuyas@ucla.edu

SAITO

Re: New Libraries: OBJ Loader, Google Web API
Reply #16 - Jun 18^th, 2005, 5:00pm

As long as checked, I could not find a way to define instances in .obj files...
I could extend my loader to have a proprietary option to be able to handle instance definitions.
But, in that case, you still have to write .obj by hand because there is no application software able to handle this proprietary option..
It reduces the size of a model file containing repetitive use of a same shape and probably makes it a bit faster to run on Processing.
So, for now, it would be better to make one independent .obj file for drawing repetitive objects.
A loader for a scene graph may be what is in charge of instance definition. If it's not so hard to write a scene graph loader, I might try to implement it...

gll wrote on Jun 1^st, 2005, 5:01pm:

Could we load in proce55ing 3D projects with instances handling (The same object is repeated many times - Block equivalent in AutoCAD) and group descriptions For example, I have a wall to import wich is composed of many repetitives objects.
As I saw, OBJ File Format do not support it (grouping exist but there's no instances).Could we have instances with OBJ or there's a way that I didn't saw

SAITO / tatsuyas@ucla.edu

SAITO

Re: parameters from .obj_files
Reply #17 - Jun 18^th, 2005, 6:08pm

Sorry for getting back to you late.
I just updated the library (now rev.07)
http://users.design.ucla.edu/~tatsuyas/tools/objloader/index.htm

the library now has two functions, getVertex() and setVertex(), which allow you to address and change each vertex. Please check the example project.
There might be a better way to transform an object.. Let me know if you have an idea..

jan_peter wrote on Jun 10^th, 2005, 11:37pm:

hello Saito,
i'd like to use vertex parameters from .obj_files to transform objects. is it possible to adress the values directly from processing. i could pars the file, but than i have the problem of drawing the shapes by connecting the right vertex.
jan peter

SAITO / tatsuyas@ucla.edu

jan_peter YaBB Newbies Offline Posts: 7 germany	getvertex(), getVertexsize Reply #18 - Jun 19^th, 2005, 6:19pm hi SAITO, yesterday i wrote a simple parser which makes it possible to transform .obj_files. because of the number of used variables it only works with 8 vertex. i was very happy to find your response today. i tested it and i'm really amazed. i will add it to the sketch i'm working on. i'll tell you more later. —jan

gll

Re: New Libraries: OBJ Loader, Google Web API
Reply #19 - Jun 21^st, 2005, 7:15am

SAITO wrote on Jun 18^th, 2005, 5:00pm:

A loader for a scene graph may be what is in charge of instance definition. If it's not so hard to write a scene graph loader, I might try to implement it...

I tried to write something like a sceneGraph handler. I just realize that there's so much different ways to do it and it would depend on the goals.

I studied different 3D formats. IGES should be a great candidate, but there's a lot of things to support (Complex curves, complex faces mesh, solid primitives). The layering and instanciation is supported. In other way, it's not readable as the .OBJ are.

LaBelle / ANAR.ch / LaBelle.spaceKIT.ca

bituman

Re: New Libraries: OBJ Loader, Google Web API
Reply #20 - Jul 1^st, 2005, 11:13am

I always get the following error when loading OBJ files exported from 3ds max 7...

java.lang.ArrayIndexOutOfBoundsException: -26
at java.util.Vector.elementAt(Unknown Source)

here's the link to the compressed OBJ MTL and texture files .. http://bituman.ftp.icd.hu/obj/obj.rar .. maybe someone can point out where i make a mistake.

PS: the code to load and display the object is the ObjLoader example program, i havent altered it, except for the model file name.

SAITO

Re: New Libraries: OBJ Loader, Google Web API
Reply #21 - Jul 16^th, 2005, 3:44am

I checked the .obj file and found the following part.
facets indexes are specified by negative values.

usemtl boards04
s 1
f -25/-25/-25 -24/-24/-24 -19/-19/-19 -20/-20/-20
f -24/-24/-24 -23/-23/-23 -18/-18/-18 -19/-19/-19
f -23/-23/-23 -22/-22/-22 -17/-17/-17 -18/-18/-18
f -22/-22/-22 -21/-21/-21 -16/-16/-16 -17/-17/-17
f -20/-20/-20 -19/-19/-19 -14/-14/-14 -15/-15/-15
f -19/-19/-19 -18/-18/-18 -13/-13/-13 -14/-14/-14
f -18/-18/-18 -17/-17/-17 -12/-12/-12 -13/-13/-13
f -17/-17/-17 -16/-16/-16 -11/-11/-11 -12/-12/-12
f -15/-15/-15 -14/-14/-14 -9/-9/-9 -10/-10/-10
f -14/-14/-14 -13/-13/-13 -8/-8/-8 -9/-9/-9
f -13/-13/-13 -12/-12/-12 -7/-7/-7 -8/-8/-8
f -12/-12/-12 -11/-11/-11 -6/-6/-6 -7/-7/-7
f -10/-10/-10 -9/-9/-9 -4/-4/-4 -5/-5/-5
f -9/-9/-9 -8/-8/-8 -3/-3/-3 -4/-4/-4
f -8/-8/-8 -7/-7/-7 -2/-2/-2 -3/-3/-3
f -7/-7/-7 -6/-6/-6 -1/-1/-1 -2/-2/-2
# 16 faces

I didn't know that they can be negative values and didn't implement the library in the way that allows models like this be loaded.
But, assuming that the nagative value means a value that starts not from 0 but from the number of vertexes that the model contains, I rewrote the library so that it handles the model data like this.

http://users.design.ucla.edu/~tatsuyas/tools/objloader/objloader_r08.zip
please donwloaded this library and replace the old library with it.
I tested the model you gave me and it shows a model that seems to be correctly rendered.

thanks!

SAITO / tatsuyas@ucla.edu

bituman YaBB Newbies Offline Posts: 34	Re: New Libraries: OBJ Loader, Google Web API Reply #22 - Jul 16^th, 2005, 8:24pm In my current project the models were easy to generate, or to code by hand.. but when i think aboutthe next poject... Im sure i'll include your name in my prayers D Thanks a lot for the: a.) help b.) library c.) both have a nice day

skrat YaBB Newbies Offline Posts: 7	Re: New Libraries: OBJ Loader, Google Web API Reply #23 - Aug 3^rd, 2005, 9:37am Hi SAITO, hi everybody, I am trying to play with Google API but I get the following exception: Exception in thread "Thread-2" java.lang.NoClassDefFoundError: com/google/soap/search/GoogleSearch at Temporary_6270_8109.setup(Temporary_6270_8109.java:12)
	don't worry

SAITO YaBB Newbies Offline Posts: 22 Los Angeles	Re: New Libraries: OBJ Loader, Google Web API Reply #24 - Aug 8^th, 2005, 6:38am I guess you haven't installed Google API .jar file that is contained in Google API developers kit released by Google. My Google API doesn't work by itself and it needs the Google API .jar file to search Google. Please refer to my website for installation. http://users.design.ucla.edu/~tatsuyas/tools/google/
	SAITO / tatsuyas@ucla.edu

bituman

Re: New Libraries: OBJ Loader, Google Web API
Reply #25 - Aug 22^nd, 2005, 11:57am

man... hate to give you bad news :)

# Max2Mtl Version 4.0 Mar 10th, 2001

#

newmtl 1_-_Default

material: 1_-_Default

Ka 1.0 0.9 0.7

material ambient: 1.0, 0.9, 0.7

Kd 1.0 0.9 0.7

Ks 0.9 0.9 0.9

d 1.0

material alpha: 1.0

Ns 0.0

illum 2

#

newmtl 2_-_Default

material: 2_-_Default

Ka 0.6 0.8 0.9

material ambient: 0.6, 0.8, 0.9

Kd 0.6 0.8 0.9

Ks 0.9 0.9 0.9

d 1.0

material alpha: 1.0

Ns 0.0

illum 2

#

newmtl 3_-_Default

material: 3_-_Default

Ka 0.0 0.0 0.0

material ambient: 0.0, 0.0, 0.0

Kd 0.0 0.0 0.0

Ks 0.9 0.9 0.9

d 1.0

material alpha: 1.0

Ns 0.0

illum 2

#

newmtl 8_-_Default

material: 8_-_Default

Ka 0.0 0.0 0.0

material ambient: 0.0, 0.0, 0.0

Kd 0.9 0.7 0.8

Ks 1.0 1.0 1.0

d 1.0

material alpha: 1.0

Ns 9.8

illum 2

#

newmtl 7_-_Default

material: 7_-_Default

Ka 0.0 0.0 0.0

material ambient: 0.0, 0.0, 0.0

Kd 0.5 0.5 0.7

Ks 1.0 1.0 1.0

d 1.0

material alpha: 1.0

Ns 9.8

illum 2

#

# EOF

model loaded

java.lang.ArrayIndexOutOfBoundsException: -7
at java.util.Vector.elementAt(Unknown Source)

obj-s can be dloaded from:

http://bituman.ftp.icd.hu/obj/data.rar

the application was your standard example applet, the one that alters the meshes.
bye :D

st33d

Re: New Libraries: OBJ Loader, Google Web API
Reply #26 - Sep 2^nd, 2005, 1:02pm

Given the possiblity of reading from OBJ files, is it possible to write back to them? I'm thinking in terms of creating a path with a Processing application and then exporting that to a 3D modelling suite so it could be tarted up a little. Is that possible? I've downloaded some code by seltar that mapped a 3D object and saved a 3Dmax ascii file:

http://processing.org/discourse/yabb/YaBB.cgi?board=Programs;action=display;num=1110307347;start=1

I intended to sift through it when I got home from the library but I came across this thread in my search for it and it seems like a question worth asking.

SAITO

Re: New Libraries: OBJ Loader, Google Web API
Reply #27 - Sep 3^rd, 2005, 12:32am

ok... I will try to investigate this.
It seems you used Max2Mtl converter. I assume that it did something unexpected.

Thanks for the report!

bituman wrote on Aug 22^nd, 2005, 11:57am:

man... hate to give you bad news :)

the application was your standard example applet, the one that alters the meshes.
bye :D

SAITO / tatsuyas@ucla.edu

JohnG Ex Member	Re: New Libraries: OBJ Loader, Google Web API Reply #28 - Nov 30^th, 2005, 1:43pm Unfortunately, it looks like some of the recent changes in processing have caused the OBJ Loader library to stop working. It works fine in 93, but not in 96/7, as I get the following error: Code: java.lang.NoSuchFieldError: folder at saito.objloader.OBJModel.getBufferedReader(OBJModel.java:321)

FragMan YaBB Newbies Offline Posts: 2	Re: New Libraries: OBJ Loader, Google Web API Reply #29 - May 19^th, 2006, 3:47pm hi, does anyone know an easy way to calculate a bounding rect depending on the Y position, i mean the actual width/height drawn to the screen. i´m working on a project where you can drag and drop 3d elements but i´m stuck at this point. thanks Christoph

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