Author Topic: load a .obj file in JPCT-AE demo  (Read 21439 times)

Offline nico_r_a

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load a .obj file in JPCT-AE demo
« on: July 21, 2011, 09:50:18 am »
Hello!!
I would like to load a .obj file in JPCT-AE.
I have read all the topics in relation with my question but i haven't found an answer.
So, how should i do to load .obj file in the demo JPCT-AE.

thank you very much

sorry for the mistakes, but i am french
« Last Edit: July 21, 2011, 11:07:06 am by nico_r_a »

Offline EgonOlsen

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Re: load a .obj file in JPCT-AE demo
« Reply #1 on: July 21, 2011, 11:13:59 am »
There's a Loader-class for loading OBJ-files. Copy your obj-file (and the mtl-file if needed) into the res/raw-folder of your project and use the Loade.loadOBJ(...) method to load it. Keep in mind that Android limits the file size based on the extension. So if your obj-file is too large (>1mb), you might want to zip it and load it via a ZipInputStream or rename it to .mp3 (no restrictions apply for that extension).
In addition, it may be required to scale and/or translate the model to make it appear correctly in the demo. For loading textured models, please refer to the wiki: http://www.jpct.net/wiki/index.php/Loading_models

Offline nico_r_a

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Re: load a .obj file in JPCT-AE demo
« Reply #2 on: July 21, 2011, 11:54:04 am »
thank you for the reply
actually my mtl et obj are in differrent folders.
Should i change the way to texture in the obj et mtl if i add the mtl et obj in (res/raw)??
if yes, what should the software be used to open the mtl and obj??

and my .obj do 3.5Mo so i must change this extension in .mp3?
 and where should i copy the command Loade.loadOBJ(...)??
and i put the way in the (...)?
« Last Edit: July 21, 2011, 12:05:36 pm by nico_r_a »

Offline EgonOlsen

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Re: load a .obj file in JPCT-AE demo
« Reply #3 on: July 21, 2011, 03:02:21 pm »
Well...maybe you should start reading and understanding the docs: http://www.jpct.net/jpct-ae/doc/com/threed/jpct/Loader.html

Offline nico_r_a

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Re: load a .obj file in JPCT-AE demo
« Reply #4 on: July 22, 2011, 03:09:28 pm »
i have seen your link,
but there aren't information on the large of my obj file.
what should i do with my obj file if his large is 3.5Mo?

and actually i have a folder with files
.obj
.mtl
.mb
.ma
.fbx
.dxf
.dae
what file should i use to create a 3d wih android please?
thank you
« Last Edit: July 22, 2011, 04:38:44 pm by nico_r_a »

Offline EgonOlsen

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Re: load a .obj file in JPCT-AE demo
« Reply #5 on: July 22, 2011, 07:47:52 pm »
You need obj and mtl. If the file is too large, rename to .mp3 as a quick and dirty solution. However, loading a 3.5Mb OBJ file into Android might not be the best idea ever. What kind of model is that? Isn't it possible to reduce the polygon count?

Offline sienioslaw

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Re: load a .obj file in JPCT-AE demo
« Reply #6 on: July 26, 2011, 12:40:24 am »
Hello! I'm new one to this forum, and I also have problem with loading obj models...
Here is some info: I'm using Eclipse and Android SDK 2.1
I'm following this tutorial: http://www.jpct.net/wiki/index.php/Loading_3ds_Models_from_Blender - only changed loading function from 3ds into OBJ(as far I understood from doc's, I don't need mtl, so left it null),
I put my model, a example file from http://people.sc.fsu.edu/~jburkardt/data/obj/obj.html in 'assets' folder

Tried to test it on emulator but crashing like hell  :-\ and looks like it's OutOfMemory problem, but how if I only load simple cube file? 

Here is code and log:
source:
Code: [Select]
package com.threed.jpct.example;

import java.io.*;
import java.lang.reflect.Field;

import javax.microedition.khronos.egl.EGL10;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.egl.EGLDisplay;
import javax.microedition.khronos.opengles.GL10;

import android.app.Activity;
import android.content.res.AssetManager;
import android.content.res.Resources;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.view.MotionEvent;


import com.threed.jpct.*;
import com.threed.jpct.util.BitmapHelper;
import com.threed.jpct.util.MemoryHelper;
/**
 * A simple demo. This shows more how to use jPCT-AE than it shows how to write
 * a proper application for Android.
 * It includes basic activity management to handle pause and resume...
 *
 * @author EgonOlsen
 *
 */
public class HelloWorld extends Activity {
    private String thingName = "temp";
    private int thingScale = 1;//end
private static HelloWorld master = null;

private GLSurfaceView mGLView;
private MyRenderer renderer = null;
private FrameBuffer buffer = null;

private World world = null;
private RGBColor back = new RGBColor(50, 50, 100);

private float touchTurn = 0;
private float touchTurnUp = 0;

private float xpos = -1;
private float ypos = -1;

private Object3D thing = null;
private int fps = 0;

private Light sun = null;
private Camera cam = null;

AssetManager assMan;
InputStream is;
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
mGLView = new GLSurfaceView(getApplication());
renderer = new MyRenderer();
mGLView.setRenderer(renderer);
setContentView(mGLView);
}

@Override
protected void onPause() {
super.onPause();
mGLView.onPause();
}

@Override
protected void onResume() {
super.onResume();
mGLView.onResume();
}

protected void onStop() {
super.onStop();
}

public boolean onTouchEvent(MotionEvent me) {

if (me.getAction() == MotionEvent.ACTION_DOWN) {
xpos = me.getX();
ypos = me.getY();
return true;
}

if (me.getAction() == MotionEvent.ACTION_UP) {
xpos = -1;
ypos = -1;
touchTurn = 0;
touchTurnUp = 0;
return true;
}

if (me.getAction() == MotionEvent.ACTION_MOVE) {
float xd = me.getX() - xpos;
float yd = me.getY() - ypos;

xpos = me.getX();
ypos = me.getY();

touchTurn = xd / -100f;
touchTurnUp = yd / -100f;
return true;
}

try {
Thread.sleep(15);
} catch (Exception e) {
// No need for this...
}

return super.onTouchEvent(me);
}

protected boolean isFullscreenOpaque() {
return true;
}

class MyRenderer implements GLSurfaceView.Renderer {

private long time = System.currentTimeMillis();
private boolean stop = false;

public MyRenderer() {
}

public void stop() {
stop = true;
}

public void onSurfaceChanged(GL10 gl, int w, int h) {
if (buffer != null) {
buffer.dispose();
}
buffer = new FrameBuffer(gl, w, h);

if (master == null) {

world = new World();
        world.setAmbientLight(150, 150, 150);

sun = new Light(world);
sun.setIntensity(250, 250, 250);

thing = loadModel("assets/model.obj", thingScale);
        thing.build();

world.addObject(thing);

cam = world.getCamera();
cam.moveCamera(Camera.CAMERA_MOVEOUT, 50);
cam.lookAt(thing.getTransformedCenter());

SimpleVector sv = new SimpleVector();
sv.set(thing.getTransformedCenter());
sv.y -= 100;
sv.z -= 100;
sun.setPosition(sv);
//MemoryHelper.compact();

if (master == null) {
Logger.log("Saving master Activity!");
master = HelloWorld.this;
}
}
}

public void onSurfaceCreated(GL10 gl, EGLConfig config) {
}

public void onDrawFrame(GL10 gl) {

try {
if (!stop) {
if (touchTurn != 0) {
thing.rotateY(touchTurn);
touchTurn = 0;
}

if (touchTurnUp != 0) {
thing.rotateX(touchTurnUp);
touchTurnUp = 0;
}

buffer.clear(back);
world.renderScene(buffer);
world.draw(buffer);
buffer.display();

if (System.currentTimeMillis() - time >= 1000) {
Logger.log(fps + "fps");
fps = 0;
time = System.currentTimeMillis();
}
fps++;
} else {
if (buffer != null) {
buffer.dispose();
buffer = null;
}
}
} catch (Exception e) {
Logger.log(e, Logger.MESSAGE);
}
}

    private Object3D loadModel(String filename, float scale) {
assMan = getResources().getAssets();
is = new InputStream() {
@Override
public int read() throws IOException {
return 0;
}
};
        Object3D[] model = Loader.loadOBJ(is, null, scale);
        Object3D o3d = new Object3D(0);
        Object3D temp = null;
        for (int i = 0; i < model.length; i++) {
            temp = model[i];
            temp.setCenter(SimpleVector.ORIGIN);
            temp.rotateX((float)( -.5*Math.PI));
            temp.rotateMesh();
            temp.setRotationMatrix(new Matrix());
            o3d = Object3D.mergeObjects(o3d, temp);
            o3d.build();
        }
        return o3d;
    }
}
}




log:
Code: [Select]
07-25 22:33:48.269: WARN/ActivityManager(65): Activity idle timeout for HistoryRecord{44ffd098 com.threed.jpct.example/.HelloWorld}
07-25 22:33:48.549: INFO/dalvikvm-heap(466): Grow heap (frag case) to 13.402MB for 6378722-byte allocation
07-25 22:33:51.678: INFO/dalvikvm-heap(466): Forcing collection of SoftReferences for 9568078-byte allocation
07-25 22:33:51.798: ERROR/dalvikvm-heap(466): Out of memory on a 9568078-byte allocation.
07-25 22:33:51.798: INFO/dalvikvm(466): "GLThread 8" prio=5 tid=7 RUNNABLE
07-25 22:33:51.809: INFO/dalvikvm(466):   | group="main" sCount=0 dsCount=0 s=N obj=0x44e85270 self=0x11f848
07-25 22:33:51.809: INFO/dalvikvm(466):   | sysTid=472 nice=0 sched=0/0 cgrp=default handle=1283576
07-25 22:33:51.809: INFO/dalvikvm(466):   | schedstat=( 10442697916 807643615 403 )
07-25 22:33:51.828: INFO/dalvikvm(466):   at java.lang.AbstractStringBuilder.enlargeBuffer(AbstractStringBuilder.java:~97)
07-25 22:33:51.828: INFO/dalvikvm(466):   at java.lang.AbstractStringBuilder.append0(AbstractStringBuilder.java:157)
07-25 22:33:51.838: INFO/dalvikvm(466):   at java.lang.StringBuffer.append(StringBuffer.java:215)
07-25 22:33:51.838: INFO/dalvikvm(466):   at com.threed.jpct.Loader.loadBinaryFile(Loader.java:1076)
07-25 22:33:51.850: INFO/dalvikvm(466):   at com.threed.jpct.Loader.loadTextFile(Loader.java:71)
07-25 22:33:51.850: INFO/dalvikvm(466):   at com.threed.jpct.Loader.loadOBJ(Loader.java:302)
07-25 22:33:51.850: INFO/dalvikvm(466):   at com.threed.jpct.Loader.loadOBJ(Loader.java:207)
07-25 22:33:51.858: INFO/dalvikvm(466):   at com.threed.jpct.example.HelloWorld$MyRenderer.loadModel(HelloWorld.java:218)
07-25 22:33:51.858: INFO/dalvikvm(466):   at com.threed.jpct.example.HelloWorld$MyRenderer.onSurfaceChanged(HelloWorld.java:148)
07-25 22:33:51.878: INFO/dalvikvm(466):   at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1325)
07-25 22:33:51.878: INFO/dalvikvm(466):   at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1116)
07-25 22:33:51.928: INFO/ActivityManager(65): Displayed activity com.threed.jpct.example/.HelloWorld: 14353 ms (total 418702 ms)
07-25 22:33:51.958: WARN/dalvikvm(466): threadid=7: thread exiting with uncaught exception (group=0x4001d800)
07-25 22:33:52.078: ERROR/AndroidRuntime(466): FATAL EXCEPTION: GLThread 8
07-25 22:33:52.078: ERROR/AndroidRuntime(466): java.lang.OutOfMemoryError
07-25 22:33:52.078: ERROR/AndroidRuntime(466):     at java.lang.AbstractStringBuilder.enlargeBuffer(AbstractStringBuilder.java:97)
07-25 22:33:52.078: ERROR/AndroidRuntime(466):     at java.lang.AbstractStringBuilder.append0(AbstractStringBuilder.java:157)
07-25 22:33:52.078: ERROR/AndroidRuntime(466):     at java.lang.StringBuffer.append(StringBuffer.java:215)
07-25 22:33:52.078: ERROR/AndroidRuntime(466):     at com.threed.jpct.Loader.loadBinaryFile(Loader.java:1076)
07-25 22:33:52.078: ERROR/AndroidRuntime(466):     at com.threed.jpct.Loader.loadTextFile(Loader.java:71)
07-25 22:33:52.078: ERROR/AndroidRuntime(466):     at com.threed.jpct.Loader.loadOBJ(Loader.java:302)
07-25 22:33:52.078: ERROR/AndroidRuntime(466):     at com.threed.jpct.Loader.loadOBJ(Loader.java:207)
07-25 22:33:52.078: ERROR/AndroidRuntime(466):     at com.threed.jpct.example.HelloWorld$MyRenderer.loadModel(HelloWorld.java:218)
07-25 22:33:52.078: ERROR/AndroidRuntime(466):     at com.threed.jpct.example.HelloWorld$MyRenderer.onSurfaceChanged(HelloWorld.java:148)
07-25 22:33:52.078: ERROR/AndroidRuntime(466):     at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1325)
07-25 22:33:52.078: ERROR/AndroidRuntime(466):     at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1116)
07-25 22:33:52.168: WARN/ActivityManager(65):   Force finishing activity com.threed.jpct.example/.HelloWorld

Any advices?
Btw. Sorry for my english...

Offline EgonOlsen

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Re: load a .obj file in JPCT-AE demo
« Reply #7 on: July 26, 2011, 10:20:01 am »
You've coded that OutOfMemory-Exception all by yourself. Why are you creating an InputStream that does nothing but constantly writes 0 into the stream? This can't lead to anywhere else but an OutOfMemory. Simply load it like this:

Code: [Select]
cube=Object3D.mergeAll(Loader.loadOBJ(getResources().getAssets().open("cube.obj"), null, 20));
« Last Edit: July 26, 2011, 10:25:49 am by EgonOlsen »

Offline nico_r_a

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Re: load a .obj file in JPCT-AE demo
« Reply #8 on: July 28, 2011, 11:06:27 am »
ok, but when i put the file .mp3 in my raw, le file R.java doesn't update.

Offline EgonOlsen

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Re: load a .obj file in JPCT-AE demo
« Reply #9 on: July 28, 2011, 11:38:22 am »
Press f5 on the project in Eclipse.

Offline nico_r_a

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Re: load a .obj file in JPCT-AE demo
« Reply #10 on: July 28, 2011, 11:49:06 am »
i have already tried and don't update

Offline EgonOlsen

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Re: load a .obj file in JPCT-AE demo
« Reply #11 on: July 28, 2011, 12:17:15 pm »
It's an Eclipse issue. I have this problem myself from time to time. Try to erstattet Eclipse or do a clean on the project.

Offline nico_r_a

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Re: load a .obj file in JPCT-AE demo
« Reply #12 on: July 28, 2011, 02:03:44 pm »
i have another problem now.
in my .obj i don't have the link with my texture.
how can i do to create a link between the texture and the object?
« Last Edit: July 28, 2011, 02:17:38 pm by nico_r_a »

Offline EgonOlsen

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Offline nico_r_a

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Re: load a .obj file in JPCT-AE demo
« Reply #14 on: July 29, 2011, 10:30:50 am »
but i don't understand, i have downloaded deep exploration 5.06. But what should i do with the texture??
i don't understant the link between the code java in eclipse and the deep exploration

and can i do a effect transparency on a object??

I know that my questions are bad level but i am beginner.
thank you
« Last Edit: July 29, 2011, 10:49:59 am by nico_r_a »