Hi All,

In my application based on gesture event Objects are moved. On collision with other object, I remove the object. Some times I am getting random crashes onDrawFrame() because of NullPointerException in drawVertexArray.


08-03 19:05:13.160: E/AndroidRuntime(18542): FATAL EXCEPTION: GLThread 18
08-03 19:05:13.160: E/AndroidRuntime(18542): java.lang.NullPointerException
08-03 19:05:13.160: E/AndroidRuntime(18542):    at com.threed.jpct.GLRenderer.drawVertexArray(GLRenderer.java:2127)
08-03 19:05:13.160: E/AndroidRuntime(18542):    at com.threed.jpct.World.draw(World.java:1354)
08-03 19:05:13.160: E/AndroidRuntime(18542):    at com.threed.jpct.World.draw(World.java:1135)
08-03 19:05:13.160: E/AndroidRuntime(18542):    at com.goora.matthew.nappybunch.ui.BlendRenderer.onDrawFrame(BlendRenderer.java:445)
08-03 19:05:13.160: E/AndroidRuntime(18542):    at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1388)
08-03 19:05:13.160: E/AndroidRuntime(18542):    at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1138)

I am not sure what I am doing wrong. Any idea why this can happen?

Hi All,

I am trying to convert mesh.xml file to .bones file with multiple rotation argument (x90,z180) but I am getting an Illegal argument exception.


D:\jpct\bones\Bones\scripts>jmeOgre2Bones.bat -rotation x90,z180 -out model_rot_x90_z180.group.bones -in model.mesh.xml

D:\jpct\bones\Bones\scripts>echo off
Exception in thread "main" java.lang.IllegalArgumentException: Unknown args: [z1
80]
        at raft.jpct.bones.util.JMEOgreImporter.main(JMEOgreImporter.java:167)


I saw the help manual, it is mentioned to add comma between the arguments.

usage: JMEOgreImporter [options] -in <ogre.mesh.xml> [ogre.mesh.xml...]
options:
    -out <destination file>                         : destination file to write
    -scale <scale>                                  : loading scale, default 1
    -rotation <<x|y|zdegrees>[,x|y|zdegrees]...>    : loading rotation, default
none (sample: x180,y180)

Please let me know if I am missing some arguments.

Thanks and Regards,
Subha

Hi All,

My graphic designer likes to know if she can use Normal maps for the texture. Is it possible to use the texture which has used normal map?

Thanks,
Subha

Hi All,

In normal 3D object in World space, following collision detection code worked.

sphere.setCollisionMode(Object3D.COLLISION_CHECK_OTHERS);
            sphere.addCollisionListener(new CollisionListener() {
               
               @Override
               public boolean requiresPolygonIDs() {
                  // TODO Auto-generated method stub
                  return false;
               }
               
               @Override
               public void collision(CollisionEvent arg0) {
                  Log.i("HelloWorldJPCT", "Sphere collision");
                  
               }
            });

When I tried the collision detection in Bones sample code , I never got any log message, Following is the code

ninjas.get(0).get(0).setCollisionMode(Object3D.COLLISION_CHECK_SELF);
      ninjas.get(0).get(0).addCollisionListener(new CollisionListener() {
         
         @Override
         public boolean requiresPolygonIDs() {
            // TODO Auto-generated method stub
            return false;
         }
         
         @Override
         public void collision(CollisionEvent ce) {
            // TODO Auto-generated method stub
            Log.i("app", "On collision");
            
         }
      });

Please let me know if I am missing something.

Regards,
Subha

Hi,

I have a requirement where I have to drag the object based on user touch movement (basically touch & drag). Based on the topic Picking, I am able to identify if an object is touched.

My understanding to achieve drag is the object must be translated based on touch coordinates.

I understood how to get 3D to 2D coordinates and viceversa. I am unable to understand,

i) how to co relate this to translation?

ii) How the screen width and height is translated to translate factors,

when I tried

object.translate(-100,100,0); the object was not seen. I tried by trial and error and found translate x should be in range of -30 to +30 and y in range of  -45 to +45.

I did the following Math calculation on Touch listener

if (me.getAction() == MotionEvent.ACTION_MOVE) {         
           
         xpos = me.getX();
         ypos = me.getY();
         if(sphereclicked) // if the object is clicked
         {
         SimpleVector touchvector =
            Interact2D.reproject2D3DWS(world.getCamera(), fb, (int)xpos, (int)ypos).normalize();

         sphere_vector = Interact2D.projectCenter3D2D(fb,sphere); // sphere is the 3D object
         
         if(diff == null)
         {
            diff = new SimpleVector();
         }
         diff.x = ((sphere_vector.x) - xpos)/-10.5f; // this is also trial and error , I didnt understand the Math behind it
         diff.y = ((sphere_vector.x) - ypos)/-10.5f;
         diff.z = 0;
         
             Log.i("HelloWorldJPCT", "diff : %d %d %d" + diff.x+ " "+
                   diff.y+" "+ diff.z);
           
         }

And on Draw Frame,

if(sphereclicked == true)
         {
            if(diff!=null)
            {
                sphere.clearTranslation();
                sphere.translate(diff);
            }
         
         }

But after this code, object moves in y-axis and x-axis. But in negative y-axis, the object doesn't move till the end of the screen. The same with x-axis, it never moves till the end of X-Axis.

I am attaching my code for your reference. Please help me to understand the concept behind this. How to relate the touch cordinates to translate for an object.

Thanks in Advance,

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