www.jpct.net

Hi

   I am trying to load 5-6 md2 model on my GL. But it it taking more time and my app become stuck (Black screen) . So i tried to lode it in background using thread or AsyncTask. But i am getting null pointer error  in onDrow() . when i used any model object . otherwise blank screen (without model). 

class LoadModelAsyncTask extends AsyncTask<Void, Integer, Boolean>
   {
      protected Boolean doInBackground(Void... params)
      {
         System.out.println("i m doInBackground");
         ogro=loadModel(Environment.getExternalStorageDirectory() +"/texture_one.jpg",Environment.getExternalStorageDirectory() + "/logo_one.md2",0.25f);
         ogroA=loadModel(Environment.getExternalStorageDirectory() +"/texture_one.jpg",Environment.getExternalStorageDirectory() + "/circle_one.md2",0.25f);
         
         return null;
      
      }

      protected void onPostExecute(Boolean result)
      {
         System.out.println("i m onPostExecute");
         world.addObject(ogro);
         world.addObject(ogroA);
         world.buildAllObjects();
      }
   }


and call it in
onSurfaceChange() {

mLoadModelAsyncTask = new LoadModelAsyncTask();

         mLoadModelAsyncTask.execute();

cam.lookAt(ogro.getTransformedCenter());  ........1
cam.lookAt(ogroA.getTransformedCenter());.........2
}


here geting null pointer in line 1 and 2..aswell onDrow().


if any solution pls ..reply soon..!!
8)

You are not allowed to fiddle around with the world in anything but the rendering thread or your setup code (jPCT-AE isn't thread safe). If you add objects while the world is being rendered, everything may happen. A simple solution is to load the model in the thread but add it in onDraw after the loading has finished.

hi sir

As u told  i load a model in thread  in serfaceChanged()  and add the model into world  in onDrow().

public void onDrawFrame(GL10 gl)
      {
         
         if(world.getObjects()==null)
         {
            world.addObject(ogro);    ......................1
            world.addObject(ogroA);
            world.buildAllObjects();
            ................
                                 .....

but i m getting  the null pointer on line ..1. and following lines..
another way to solve it../

Please post the exception's stack trace. What you claim that happens actually can't happen for two reasons:

• That line can cause a nullpointer only if world is null. But world can't be null, because you access it before in the if-clause.
• That code never gets executed, because world.getObjects() never returns null.

Hi

  Now i am not getting any exception but now my model is not visible. it shows blank surface .following is my code.....

public void onSurfaceChanged(GL10 gl, int w, int h) {
         if (fb != null) {
            fb.dispose();
         }
         fb = new FrameBuffer(gl, w, h);
         world = new World();
         world.setAmbientLight(100, 100, 100);
         res = getResources();
         sun = new Light(world);
         sun.setIntensity(250, 250, 250);
         tm = TextureManager.getInstance();

         mLoadModelAsyncTask = new LoadModelAsyncTask(); // loading model in thread
         mLoadModelAsyncTask.execute();
      
         cam = world.getCamera();
         world.getCamera().setPosition(0, 0, -20);
         cam.moveCamera(Camera.CAMERA_MOVEOUT, 50);
         //cam.lookAt(ogro.getTransformedCenter());
         //cam.lookAt(ogroA.getTransformedCenter());

         SimpleVector sv = new SimpleVector();
         sv.y -= 50;
         sv.z -= 100;
         sun.setPosition(sv);

         MemoryHelper.compact();
      
      }
      public void onDrawFrame(GL10 gl)
      {
         if(ogro!=null&& ogroA!=null)
         {
            System.out.println("world--------------->"+world); //world is not null
            System.out.println("ogro--------------->"+ogro); // model is not null
            
            world.addObject(ogro);
            world.addObject(ogroA);
            world.buildAllObjects();
         }

  but object is not visible on surface ..pls check out the problem....and !!!

hi

thanks for help ..its working fine....