Carga de modelos 3d con jPCT-AE

Estoy intentando cargar los modelos 3d en mi uso con jPCT-AE . He leído varios tutoriales y creo que entiendo los conceptos básicos, pero todavía tengo éxito en la integración de los archivos 3d que tengo.

Estoy haciendo uso de trozos de códigos que encontré en el paquete de tutoriales com.example.jpct;

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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; } } } 

Así que las aplicaciones fallan, aquí está mi 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) 

El archivo 3d está en la carpeta "assets", y es un archivo 3ds válido (lo probé en otro motor 3d)

¿Puedes ayudarme por favor?

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

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

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

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