Download 3d models using jPCT-AE

Question

I am trying to load 3d models into my application using jPCT-AE . I read a few tutorials and I think I understand the basics, but I have not yet been able to integrate the 3d files that I have.

I use the code snippets that I found in the tutorials package com.example.jpct;

import java.io.IOException; import java.io.InputStream; import java.io.UnsupportedEncodingException; 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.opengl.GLSurfaceView; import android.os.Bundle; import android.view.MotionEvent; import com.threed.jpct.Camera; import com.threed.jpct.FrameBuffer; import com.threed.jpct.Light; import com.threed.jpct.Loader; import com.threed.jpct.Logger; import com.threed.jpct.Object3D; import com.threed.jpct.Primitives; import com.threed.jpct.RGBColor; import com.threed.jpct.SimpleVector; import com.threed.jpct.Texture; import com.threed.jpct.TextureManager; import com.threed.jpct.World; import com.threed.jpct.util.BitmapHelper; import com.threed.jpct.util.MemoryHelper; import java.io.*; import com.threed.jpct.*; import android.content.res.Resources; import android.opengl.GLSurfaceView.EGLConfigChooser; import android.opengl.GLSurfaceView.Renderer; import android.util.Log; /** * 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 MainActivity extends Activity { // Used to handle pause and resume... private static MainActivity master = null; private GLSurfaceView mGLView; private MyRenderer renderer = null; private FrameBuffer fb = 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 cube = null; private int fps = 0; private Light sun = null; AssetManager assMan; InputStream is; private String thingName = "palm-realviz"; private int thingScale = 1;//end protected void onCreate(Bundle savedInstanceState) { Logger.log("onCreate"); if (master != null) { copy(master); } super.onCreate(savedInstanceState); mGLView = new GLSurfaceView(getApplication()); mGLView.setEGLConfigChooser(new GLSurfaceView.EGLConfigChooser() { public EGLConfig chooseConfig(EGL10 egl, EGLDisplay display) { // Ensure that we get a 16bit framebuffer. Otherwise, we'll fall // back to Pixelflinger on some device (read: Samsung I7500) int[] attributes = new int[] { EGL10.EGL_DEPTH_SIZE, 16, EGL10.EGL_NONE }; EGLConfig[] configs = new EGLConfig[1]; int[] result = new int[1]; egl.eglChooseConfig(display, attributes, configs, 1, result); return configs[0]; } }); renderer = new MyRenderer(); mGLView.setRenderer(renderer); setContentView(mGLView); } @Override protected void onPause() { super.onPause(); mGLView.onPause(); } @Override protected void onResume() { super.onResume(); mGLView.onResume(); } @Override protected void onStop() { super.onStop(); } private void copy(Object src) { try { Logger.log("Copying data from master Activity!"); Field[] fs = src.getClass().getDeclaredFields(); for (Field f : fs) { f.setAccessible(true); f.set(this, f.get(src)); } } catch (Exception e) { throw new RuntimeException(e); } } 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(); public MyRenderer() { } public void onSurfaceChanged(GL10 gl, int w, int h) { if (fb != null) { fb.dispose(); } fb = new FrameBuffer(gl, w, h); if (master == null) { world = new World(); world.setAmbientLight(20, 20, 20); sun = new Light(world); sun.setIntensity(250, 250, 250); // Create a texture out of the icon...:-) Texture texture = new Texture(BitmapHelper.rescale(BitmapHelper.convert(getResources().getDrawable(R.drawable.ic_launcher)), 64, 64)); TextureManager.getInstance().addTexture("texture", texture); try { cube = loadModel("assets/" + thingName + ".3ds", thingScale); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } //Primitives.getCube(10); //cube.calcTextureWrapSpherical(); //cube.setTexture("texture"); //cube.strip(); cube.build(); world.addObject(cube); Camera cam = world.getCamera(); cam.moveCamera(Camera.CAMERA_MOVEOUT, 50); cam.lookAt(cube.getTransformedCenter()); SimpleVector sv = new SimpleVector(); sv.set(cube.getTransformedCenter()); sv.y -= 100; sv.z -= 100; sun.setPosition(sv); MemoryHelper.compact(); if (master == null) { Logger.log("Saving master Activity!"); master = MainActivity.this; } } } public void onSurfaceCreated(GL10 gl, EGLConfig config) { } public void onDrawFrame(GL10 gl) { if (touchTurn != 0) { cube.rotateY(touchTurn); touchTurn = 0; } if (touchTurnUp != 0) { cube.rotateX(touchTurnUp); touchTurnUp = 0; } fb.clear(back); world.renderScene(fb); world.draw(fb); fb.display(); if (System.currentTimeMillis() - time >= 1000) { Logger.log(fps + "fps"); fps = 0; time = System.currentTimeMillis(); } fps++; } private Object3D loadModel(String filename, float scale) throws UnsupportedEncodingException { InputStream stream = new ByteArrayInputStream(filename.getBytes("UTF-8")); Object3D[] model = Loader.load3DS(stream, 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; } } } 

So applications fail, here is my logCat

 FATAL EXCEPTION: GLThread 93 java.lang.RuntimeException: [ 1363008600568 ] - ERROR: Not a valid 3DS file! at com.threed.jpct.Logger.log(Logger.java:189) at com.threed.jpct.Loader.load3DS(Loader.java:1554) at com.threed.jpct.Loader.load3DS(Loader.java:154) at com.example.jpct.MainActivity$MyRenderer.loadModel(MainActivity.java:269) at com.example.jpct.MainActivity$MyRenderer.onSurfaceChanged(MainActivity.java:207) at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1505) at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1240) 

The 3D file is located in the "assets" folder and is a valid 3ds file (I tested it on another 3d engine).

Can you help me?

Answer 1

Try creating an InputStream in the loadModel method instead:

 InputStream stream = mContext.getAssets().open("FILENAME.3DS") 

And look if this has changed or not. Here Context is the Application Context , which you can get from the Activity that creates the renderer:

 // the "this" refers to your "MainActivity" Context mContext = this.getApplicationContext(); 

Answer 2

 cube=Object3D.mergeAll(Loader.load3DS(getResources().getAssets().open("chair.3ds", 5)); 

Use this line to download a 3ds file. In the same way, you can download other file formats supported by jPCT-AE.

Answer 3

 InputStream stream = new ByteArrayInputStream(filename.getBytes("UTF-8")); 

I think .. the line above in your code does not read the file in InputStream, and not just copying it byte array of the string object filename.