how can i use the "objimport" library in processing 2.0b8?

monkstone

Re: how can i use the "objimport" library in processing 2.0b8?

6 months ago

Its built in see the included example Shape/LoadDisplayShape (rocket.obj).

duanyukai

Re: Re: how can i use the "objimport" library in processing 2.0b8?

6 months ago

En, but how can I load the mtl into processing ,I don`t know the structure of the obj and mtl ,and it can only show the color ,but no texture .and I use opengl as the "objimport" example(eg:

g.glEnable(GL.GL_DEPTH_TEST);
g.glDepthFunc(g.GL_LEQUAL);
g.glColor4f(1.0f,1.0f,1.0f,0.0f);
//g.glBlendFunc(GL.GL_SRC_ALPHA,GL.GL_ONE);
g.glLightfv ( GL.GL_LIGHT1, GL.GL_AMBIENT, light_ambient, 0 );
g.glLightfv ( GL.GL_LIGHT1, GL.GL_DIFFUSE, light_diffuse, 0 );
g.glLightfv ( GL.GL_LIGHT1, GL.GL_SPECULAR, light_specular, 0 );
g.glLightfv ( GL.GL_LIGHT1, GL.GL_POSITION, light_position, 0 );
g.glEnable( GL.GL_LIGHT1 );
g.glEnable( GL.GL_LIGHTING );

g.glEnable( GL.GL_COLOR_MATERIAL );

）but there are no such functions in processing 2.0b8 ,but in processing 1.5.1
and i don`t know "import javax.media.opengl.*; " .what`s the use of it?
thanks~~

duanyukai

Re: Re: how can i use the "objimport" library in processing 2.0b8?

6 months ago

en,but I found that using the loadShape("XXX.obj"); is so slow. Did I have misconfigured ？Using the objloader is fast
but when I use "TRIANGLE_STRIP" method ,I can get the small things loaded .(Oh,Sorry ,I forgot to say that my obj is a building.)

it has wallpaper ,but it cannot be loaded by processing 2.0 using objloader ,but can in processing 1.5.1 using objimport,
I think it`s the " TRIANGLE_STRIP" or "QUADS" etc. do .but I don`t know why it shows as the pic above.
there`s the effect in 1.5.1 using objimport

the room~ (right-top)

thanks~~~~~

duanyukai

Re: how can i use the "objimport" library in processing 2.0b8?

6 months ago

En, but how can I load the mtl into processing ,I don`t know the structure of the obj and mtl ,and it can only show the color ,but no texture .and I use opengl as the "objimport" example(eg:

g.glEnable(GL.GL_DEPTH_TEST);
g.glDepthFunc(g.GL_LEQUAL);
g.glColor4f(1.0f,1.0f,1.0f,0.0f);
//g.glBlendFunc(GL.GL_SRC_ALPHA,GL.GL_ONE);
g.glLightfv ( GL.GL_LIGHT1, GL.GL_AMBIENT, light_ambient, 0 );
g.glLightfv ( GL.GL_LIGHT1, GL.GL_DIFFUSE, light_diffuse, 0 );
g.glLightfv ( GL.GL_LIGHT1, GL.GL_SPECULAR, light_specular, 0 );
g.glLightfv ( GL.GL_LIGHT1, GL.GL_POSITION, light_position, 0 );
g.glEnable( GL.GL_LIGHT1 );
g.glEnable( GL.GL_LIGHTING );

g.glEnable( GL.GL_COLOR_MATERIAL );

）but there are no such functions in processing 2.0b8 ,but in processing 1.5.1
and i don`t know "import javax.media.opengl.*; " .what`s the use of it?
thanks~~

monkstone

Re: Re: how can i use the "objimport" library in processing 2.0b8?

6 months ago

Does not the rocket have mtl? It seems you only need to include the mtl file along with the object file in the data folder!!!! No need for that opengl stuff (P3D is opengl). However if you want to do something fancy you are on your own, read the code at https://github.com/processing/processing/blob/master/core/src/processing/core/PShapeOBJ.java.

monkstone

Re: how can i use the "objimport" library in processing 2.0b8?

6 months ago

Could it be a "path" issue (ie folder names with spaces or lack of relative path support)?

mtllib rocket.mtl
g Rocket

extract of rocket.obj where mtl is specified (require relative path support?).

duanyukai

Re: Re: how can i use the "objimport" library in processing 2.0b8?

6 months ago

en,can you get a look at my codes?thanks.

import saito.objloader.*;

// declare that we need a OBJModel and we'll be calling it "model"
OBJModel model;
float rotX;
float rotY;
// these booleans will be used to turn on and off bits of the OBJModel
boolean bTexture = true;
boolean bStroke = false;
boolean bMaterial = true;

float aspectRatio = 1;
float myanglezhuan = 0;
float myangleyang = 0;
float myz = -10;
float myy = -3000;
float myx = -10;
boolean auto = false;
int auto_zhuan = 0;
int auto_zou = 0;
int auto_yang = 0;
void setup()
{
    size(600, 600, OPENGL);
     perspective( PI*.25, aspectRatio, 1, 100000 );
    // making an object called "model" that is a new instance of OBJModel
    model = new OBJModel(this, "fanhua1.obj", "fanhua1.mtl", TRIANGLE_STRIP);
    // turning on the debug output (it's all the stuff that spews out in the black box down the bottom)
    model.enableDebug();

    model.scale(8);

    noStroke();
    textureWrap(REPEAT);
}

void draw()
{
    background(32);
    lights();

    //this will do nothing until the model material is turned off
    fill(255,0,255);

    pushMatrix();
    translate(width/2, height/2, 0);
    rotateX(rotY);
    rotateY(rotX);
        textureWrap(REPEAT);
    model.draw();
         textureWrap(REPEAT);
    popMatrix();
      camera( myx, -myy, myz,myx +10*sin(myanglezhuan)*cos(myangleyang) ,-myy-10*sin(myangleyang) ,myz+10*cos(myanglezhuan)*cos(myangleyang) , 0, 1, 0 );

}

void keyPressed() {
    // turns on and off the texture listed in .mtl file
    if(key == 't') {
        if(!bTexture) {
            model.enableTexture();
            bTexture = true;
        }
        else {
            model.disableTexture();
            bTexture = false;
        }
    }

    else if(key == 'm') {
        // turns on and off the material listed in .mtl file
        if(!bMaterial) {
            model.enableMaterial();
            bMaterial = true;
        }
        else {
            model.disableMaterial();
            bMaterial = false;
        }
    }

    else if(key == 'j') {
        if(!bStroke) {
            stroke(10, 10, 10);
            bStroke = true;
        }
        else {
            noStroke();
            bStroke = false;
        }
    }

    // the follwing changes the render modes
    // POINTS mode is a little flakey in OPENGL (known processing bug)
    // the best one to use is the one you exported the obj as
    // when in doubt try TRIANGLES or POLYGON
    else if(key=='1') {
        stroke(10, 10, 10);
        bStroke = true;
        model.shapeMode(POINTS);
    }

    else if(key=='2') {
        stroke(10, 10, 10);
        bStroke = true;
        model.shapeMode(LINES);
    }

    else if(key=='3') {
        model.shapeMode(TRIANGLES);
    }

    else if(key=='4') {
        model.shapeMode(POLYGON);
    }

    else if(key=='5') {
        model.shapeMode(TRIANGLE_STRIP);
    }

    else if(key=='6') {
        model.shapeMode(QUADS);
    }

    else if(key=='7') {
        model.shapeMode(QUAD_STRIP);
    }
      if (key == 'a') {
    myanglezhuan = myanglezhuan + PI / 18;
      if (myanglezhuan > TWO_PI){
      myanglezhuan = myanglezhuan - TWO_PI;
      }
      auto_zhuan = 10;
      } else if(key == 'w'){
    myz = myz + 100*cos(myanglezhuan);
    myx = myx + 100*sin(myanglezhuan);
    auto_zou = 50;
} else if(key == 'd'){
        myanglezhuan = myanglezhuan - PI/18;
       if (myanglezhuan < 0){
      myanglezhuan = myanglezhuan + TWO_PI;
      }
       auto_zhuan = -10;
} else if(key == 's'){
    myz = myz - 100*cos(myanglezhuan);
    myx = myx - 100*sin(myanglezhuan);
    auto_zou = -50;
} else if(key == 'z'){
    myangleyang = myangleyang + PI/18;
     if (myangleyang > TWO_PI ){
      myangleyang = myangleyang - TWO_PI;
     }
} else if(key == 'x'){
    myangleyang = myangleyang - PI/18;
     if (myangleyang < 0 ){
      myangleyang = myangleyang + TWO_PI;
     }
     }else if(key == 'o'){
          myy = myy +50;

}else if(key == 'p'){
          myy = myy - 50;
}
}

void mouseDragged()
{
    rotX += (mouseX - pmouseX) * 0.01;
    rotY -= (mouseY - pmouseY) * 0.01;
}

I used the example in the library "objloader" ,you can ignore the keypress which is no the focus.
I think the obj and the mtl and jpg are important:
notice: press "o" to go up to the room which has items in it.
download : http://pan.baidu.com/share/link?shareid=393345&uk=1023831182
click"下载"
thanks

monkstone

Re: how can i use the "objimport" library in processing 2.0b8?

6 months ago

I have strong feeling that the original library will not work well with processing-2.0. However as mentioned before parts of the functionality are now included in the processing core. See the Shape/LoadShapeOBJ example. One important gotcha is you need to use the 3 argument version of scale, to scale shape:-

void setup() {
size(1280, 1024, P3D);
rocket = loadShape("rocket.obj");
rocket.scale(2, 2, 2);
rocket.translate(0, 200, 0); // surprisingly positive 'y' is now up!!!
}

Also PShape (certainly 3D version) is very not well documented, but you can translate and rotate the PShape. I will have an experiment with NetBeans to see what else is implemented, but you may be better sticking with processing-1.5.1 for your work.

monkstone

Re: Re: how can i use the "objimport" library in processing 2.0b8?

6 months ago

Also I had a look at your obj and mtl files, and I guessed they may not be in a compatible format....

So I parsed them through "meshlab" just in case see the results here:-

https://gist.github.com/monkstone/5294909, but that was probably a red herring!

Seemed to work after a fashion for me with this stripped down code (using peasycam library as I can't get on with your camera and rotation setup, requires and updated peasycam for processing-2.0 version). What I learned was the textureWrap(REPEAT), needs to come before loadShape. The getWidth() and getHeight() are handy to get object bounds. The three args form of scale is handy to correct inverted model (possibly owing to crazy "processing" coordinate system where y positive is down).

import peasy.*;
PeasyCam cam;
PShape model;
void setup()
{
size(1280, 1024, P3D);
cam = new PeasyCam(this, 100);
cam.setMinimumDistance(50);
cam.setMaximumDistance(2500);
textureWrap(REPEAT);
model = loadShape( "fanhua1.obj");
model.scale(0.4, -0.4, 0.4); // invert model in y axis with negative value
model.translate(-model.getWidth()/2, model.getHeight()/2);
noStroke();
}
void draw()
{
background(32);
lights();
pushMatrix();
shape(model);
popMatrix();
}

monkstone

Re: how can i use the "objimport" library in processing 2.0b8?

6 months ago

Just found out that proscene is even easier to use than peasycam here is the proscene alternative, note the grid arrows don't show up when you save frame, see image below (from processing ide):-

import remixlab.proscene.*;
Scene scene;
PShape model;
void setup()
{
size(1280, 1024, P3D);
scene = new Scene(this);
textureWrap(REPEAT);
model = loadShape( "fanhua1.obj");
model.scale(0.05f, -0.05f, 0.05f); // invert model
model.translate(-model.getWidth()/2, model.getHeight()/2);
noStroke();
}
void draw()
{
background(32);
lights();
shape(model);
}
void mousePressed(){
saveFrame("fan.png");
}