Terrain texture glitching? - Java-Gaming.org

I am using Ardor3D for a game. I made a simple array terrain data provider (creates terrain out of a float array). Then, I used an awtexturesource (provides texture for the terrain) and added a white rectangle that fills the whole terrain. At certain angles, though, it looks like :

What are the random black areas??? What am I doing wrong?

Code: (ExampleBase is a simple base for games that calls initExample() then repeatedly calls updateExample() in a loop)

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public class Level extends ExampleBase {

   Node _level=new Node("Level Root");
   private final float farPlane = 8000.0f; 
   private Terrain terrain;
   
   final int SIZE = 2048;
   PointLight pl=new PointLight();
   
   
   private double counter = 0;
    private int frames = 0;

   public void updateExample(ReadOnlyTimer t){
      counter += t.getTimePerFrame();
        frames++;
        if (counter > 1) {
            final double fps = frames / counter;
            counter = 0;
            frames = 0;
            System.out.printf("%7.1f FPS\n", fps);
        }
      pl.setLocation(_canvas.getCanvasRenderer().getCamera().getLocation());
   }
   
   
   @Override
   protected void initExample() {
      _canvas.setTitle("Terrain Example");
        _canvas.getCanvasRenderer().getCamera().setLocation(new Vector3(0, 10, 0));
        _canvas.getCanvasRenderer().getCamera().lookAt(new Vector3(1, -300, 1), Vector3.UNIT_Y);
        _canvas.getCanvasRenderer().getCamera().setFrustumPerspective(
                70.0,
                (float) _canvas.getCanvasRenderer().getCamera().getWidth()
                        / _canvas.getCanvasRenderer().getCamera().getHeight(), 1.0f, farPlane);
        _canvas.getCanvasRenderer().getRenderer().setBackgroundColor(ColorRGBA.CYAN);
        _controlHandle.setMoveSpeed(300);
      setupDefaultStates();
      
      AwtTextureSource awt = new AwtTextureSource(8, TextureStoreFormat.RGBA8);
      
      try {
           
         final int SIZE = 2048;

            float[] heightMap=new float[SIZE*SIZE];
            for(int i=0;i<heightMap.length;i++)heightMap[i]=0f;
            
      

            final TerrainDataProvider terrainDataProvider = new ArrayTerrainDataProvider(heightMap, SIZE, new Vector3(1, 300, 1));

            TerrainBuilder b=new TerrainBuilder(terrainDataProvider, _canvas.getCanvasRenderer().getCamera());
            b.addTextureConnection(awt);
            
            terrain = b.setShowDebugPanels(true).build();

            
            terrain.getTextureClipmap().setShowDebug(false);
            terrain.reloadShader();
            
            _level.attachChild(terrain);
        } catch (final Exception ex1) {
            System.out.println("Problem setting up terrain...");
            ex1.printStackTrace();
        }
      

        AwtShapeElement rectangle = new AwtShapeElement(new Rectangle(2048, 2048));
        Transform t = new Transform();
        rectangle.setTransform(t);
        awt.getProvider().addElement(rectangle);
      
      _root.attachChild(_level);
      
   }
   //copied from ArrayTerrainExample
   private void setupDefaultStates() {
        _lightState.detachAll();
        final DirectionalLight dLight = new DirectionalLight();
        dLight.setEnabled(true);
        dLight.setAmbient(new ColorRGBA(0.4f, 0.4f, 0.5f, 1));
        dLight.setDiffuse(new ColorRGBA(0.6f, 0.6f, 0.5f, 1));
        dLight.setSpecular(new ColorRGBA(0.3f, 0.3f, 0.2f, 1));
        dLight.setDirection(new Vector3(-1, -1, -1).normalizeLocal());
        
        pl.setAmbient(new ColorRGBA(0.4f, 0.4f, 0.5f, 1));
        pl.setDiffuse(new ColorRGBA(0.6f, 0.6f, 0.5f, 1));
        pl.setSpecular(new ColorRGBA(0.3f, 0.3f, 0.2f, 1));
        pl.setAttenuate(false);
        _lightState.attach(pl);
        _lightState.attach(dLight);

        _lightState.setEnabled(true);

        final CullState cs = new CullState();
        cs.setEnabled(true);
        cs.setCullFace(CullState.Face.Back);
        _root.setRenderState(cs);

        final FogState fs = new FogState();
        fs.setStart(farPlane / 2.0f);
        fs.setEnd(farPlane);
        fs.setColor(new ColorRGBA(1.0f, 1.0f, 1.0f, 1.0f));
        fs.setDensityFunction(DensityFunction.Linear);
        _root.setRenderState(fs);
    }

   /**
    * @param args
    */
   public static void main(String[] args) {
      start(Level.class);

   }

}