Examples of com.jme3.terrain.geomipmap.TerrainGrid

com.jme3.effect.EmitterSphereShape
TerrainGrid itself is an actual TerrainQuad. Its four children are the visible four tiles.

The grid is indexed by cells. Each cell has an integer XZ coordinate originating at 0,0. TerrainGrid will piggyback on the TerrainLodControl so it can use the camera for its updates as well. It does this in the overwritten update() method.
It uses an LRU (Least Recently Used) cache of 16 terrain tiles (full TerrainQuadTrees). The center 4 are the ones that are visible. As the camera moves, it checks what camera cell it is in and will attach the now visible tiles.
The 'quadIndex' variable is a 4x4 array that represents the tiles. The center four (index numbers: 5, 6, 9, 10) are what is visible. Each quadIndex value is an offset vector. The vector contains whole numbers and represents how many tiles in offset this location is from the center of the map. So for example the index 11 [Vector3f(2, 0, 1)] is located 2*terrainSize in X axis and 1*terrainSize in Z axis.
As the camera moves, it tests what cameraCell it is in. Each camera cell covers four quad tiles and is half way inside each one.
```
 +-------+-------+ | 1     |     3 |    Four terrainQuads that make up the grid |    *..|..*    |    with the cameraCell in the middle, covering |----|--|--|----|    all four quads. |    *..|..*    | | 2     |     4 | +-------+-------+ 
```
This results in the effect of when the camera gets half way across one of the sides of a quad to an empty (non-loaded) area, it will trigger the system to load in the next tiles.
The tile loading is done on a background thread, and once the tile is loaded, then it is attached to the qrid quad tree, back on the OGL thread. It will grab the terrain quad from the LRU cache if it exists. If it does not exist, it will load in the new TerrainQuad tile.
The loading of new tiles triggers events for any TerrainGridListeners. The events are:
- tile Attached
- tile Detached
- grid moved.
These allow physics to update, and other operation (often needed for loading the terrain) to occur at the right time.
@author Anthyon

  public static void startApp(){
    app.startCanvas();
    app.enqueue(new Callable<Void>(){
      public Void call(){
        if (app instanceof SimpleApplication){
          SimpleApplication simpleApp = (SimpleApplication) app;
          simpleApp.getFlyByCamera().setDragToRotate(true);
          String assdir =  new File(workspace).getAbsolutePath();
          app.setAssetsPath(assdir);
        }
        return null;
      }

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     * Attaches Statistics View to guiNode and displays it on the screen
     * above FPS statistics line.
     *
     */
    public void loadStatsView() {
        statsView = new StatsView("Statistics View", assetManager, renderer.getStatistics());
//         move it up so it appears above fps text
        statsView.setLocalTranslation(0, fpsText.getLineHeight(), 0);
        guiNode.attachChild(statsView);
    }

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        listener = new Listener();
        ar.setListener(listener);
        
        // init StateManager ----------------------------
        stateManager = new AppStateManager(this);
        
        // simple Init ----------------------------------
        guiNode.setQueueBucket(Bucket.Gui);
        guiNode.setCullHint(CullHint.Never);
        //loadFPSText();

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    private void setColor(Node node, ColorRGBA color){
  for(int i = 0; i < node.getQuantity(); i++){
      Spatial spatial = node.getChild(i);
      if(spatial instanceof Geometry){
                //Material material = new Material();
                AssetManager assetManager = JmeSystem.newAssetManager(Thread.currentThread().getContextClassLoader().getResource("com/jme3/asset/Desktop.cfg"));
                Material material = new Material(assetManager, "Common/MatDefs/Misc/SolidColor.j3md");
                material.setColor("m_Color",color);
                //Material geomMaterial = ((Geometry)spatial).getMaterial();
                spatial.setMaterial(material);
                System.out.println("Spatial: "+spatial.getName());

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     * Sets the color of the geometries of the children and home.
     * Note, this is a recursive method.
     * @param node the node that contains children
     **/
    private void setColor(Geometry geometry, ColorRGBA color){
        AssetManager assetManager = JmeSystem.newAssetManager(Thread.currentThread().getContextClassLoader().getResource("com/jme3/asset/Desktop.cfg"));
        Material material = new Material(assetManager, "Common/MatDefs/Misc/SolidColor.j3md");
        material.setColor("m_Color",color);
        geometry.setMaterial(material);
        System.out.println("Spatial: "+geometry.getName());
    }

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    //bgNode.attachChild(sky);


    sphere.updateModelBound();
    sphere.setQueueBucket(Bucket.Sky);
    Material sky = new Material(assetManager, "Common/MatDefs/Misc/Sky.j3md");
    TextureKey key = new TextureKey("Textures/Sky/Stars.dds", true);
    key.setGenerateMips(true);
    key.setAsCube(true);
    Texture tex = assetManager.loadTexture(key);
    sky.setTexture("m_Texture", tex);
    sky.setVector3("m_NormalScale", Vector3f.UNIT_XYZ);
    sphere.setMaterial(sky);
    sphere.setCullHint(Spatial.CullHint.Never);

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        // init Audio ----------------------------------
        // edited by floh -- 31/10/2011
        ar = JmeSystem.newAudioRenderer(settings);
        ar.initialize();


        listener = new Listener();
        ar.setListener(listener);
        
        // init StateManager ----------------------------
        stateManager = new AppStateManager(this);

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            Spatial spatial = assetManager.loadModel(obj);
            //Material mat = new Material(assetManager, "Common/MatDefs/Misc/ShowNormals.j3md");
            //spatial.setMaterial(mat);
            node.attachChild(spatial);


      node.setModelBound(new BoundingSphere());
      node.updateModelBound();
  } catch (Exception e) {
            e.printStackTrace();
      //logger.logp(Level.SEVERE, this.getClass().toString(),"loadNode()", "Exception", e);
      node = null;

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    entities.add(entity);
    mapNode.attachChild(entity);
  }
  
  public CollisionResults getCollisions(Ray ray) {
    CollisionResults results = new CollisionResults();
    mapNode.collideWith(ray, results);
    return results;
  }

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        flame.setSelectRandomImage(true);
        flame.setStartColor(new ColorRGBA(1f, 0.4f, 0.05f, 1f));
        flame.setEndColor(new ColorRGBA(.4f, .22f, .12f, 0f));
        flame.setStartSize(1.3f);
        flame.setEndSize(2f);
        flame.setShape(new EmitterSphereShape(Vector3f.ZERO, 1f));
        flame.setParticlesPerSec(0);
        flame.setGravity(-5f);
        flame.setLowLife(1f);
        flame.setHighLife(1f);
        flame.setInitialVelocity(new Vector3f(0, 7, 0));

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