Map: Fine-grained terrain grid implemented. Now there is smoother loading and unloading of terrain tiles.

src/roadtrip/view/FineTerrainGrid.java

@@ -41,6 +41,7 @@ import com.jme3.math.FastMath;
 import com.jme3.math.Vector2f;
 import com.jme3.math.Vector3f;
 import com.jme3.scene.Spatial;
+import com.jme3.scene.control.LodControl;
 import com.jme3.scene.control.UpdateControl;
 import com.jme3.terrain.Terrain;
 import com.jme3.terrain.geomipmap.LRUCache;
@@ -122,10 +123,11 @@ public class FineTerrainGrid extends TerrainQuad {
     protected HeightMapGrid heightMapGrid;
     private TerrainGridTileLoader gridTileLoader;
     protected Vector3f[] quadIndex;
-    protected Set<TerrainGridListener> listeners = new HashSet<TerrainGridListener>();
+    protected Set<TerrainGridListener> listeners = new HashSet<>();
     protected Material material;
     //cache  needs to be 1 row (4 cells) larger than what we care is cached
-    protected LRUCache<Vector3f, TerrainQuad> cache = new LRUCache<Vector3f, TerrainQuad>(20);
+    protected LRUCache<Vector3f, TerrainQuad> cache = new LRUCache<>(
+            getSubdivisionsPerSide() * getSubdivisionsPerSide() + getSubdivisionsPerSide());
     protected int cellsLoaded = 0;
     protected int[] gridOffset;
     protected boolean runOnce = false;
@@ -134,6 +136,11 @@ public class FineTerrainGrid extends TerrainQuad {
     public int getSize() {
         return size;
     }
+    
+    public int getSubdivisionsPerSide()
+    {
+        return 8;
+    }
 
     protected class UpdateQuadCache implements Runnable {
 
@@ -153,9 +160,9 @@ public class FineTerrainGrid extends TerrainQuad {
          * neighbours).
          */
         public void run() {
-            for (int i = 0; i < 4; i++) {
-                for (int j = 0; j < 4; j++) {
-                    int quadIdx = i * 4 + j;
+            for (int i = 0; i < getSubdivisionsPerSide(); i++) {
+                for (int j = 0; j < getSubdivisionsPerSide(); j++) {
+                    int quadIdx = i * getSubdivisionsPerSide() + j;
                     final Vector3f quadCell = location.add(quadIndex[quadIdx]);
                     TerrainQuad q = cache.get(quadCell);
                     if (q == null) {
@@ -221,20 +228,18 @@ public class FineTerrainGrid extends TerrainQuad {
     }
 
     protected boolean isCenter(int quadIndex) {
-        return quadIndex == 9 || quadIndex == 5 || quadIndex == 10 || quadIndex == 6;
+        // The only thing that is not a center for us here are the edges of the grid.
+        int w = getSubdivisionsPerSide();
+        // left / right edge
+        if (quadIndex % w == 0 || (quadIndex + 1) % w == 0) return false;
+        // top / down edge
+        if (quadIndex < w || quadIndex >= (w*w - w)) return false;
+        // center
+        return true;
     }
 
     protected int getQuadrant(int quadIndex) {
-        if (quadIndex == 5) {
-            return 1;
-        } else if (quadIndex == 9) {
-            return 2;
-        } else if (quadIndex == 6) {
-            return 3;
-        } else if (quadIndex == 10) {
-            return 4;
-        }
-        return 0; // error
+        return quadIndex + 1; // whatever, just not 0
     }
 
     public FineTerrainGrid(String name, int patchSize, int maxVisibleSize, Vector3f scale, TerrainGridTileLoader terrainQuadGrid,
@@ -268,8 +273,8 @@ public class FineTerrainGrid extends TerrainQuad {
 
     private void initData() {
         int maxVisibleSize = size;
-        this.quarterSize = maxVisibleSize >> 2;
-        this.quadSize = (maxVisibleSize + 1) >> 1;
+        this.quarterSize = maxVisibleSize / getSubdivisionsPerSide();
+        this.quadSize = (maxVisibleSize / getSubdivisionsPerSide()) + 1;
         this.totalSize = maxVisibleSize;
         this.gridOffset = new int[]{0, 0};
 
@@ -282,11 +287,14 @@ public class FineTerrainGrid extends TerrainQuad {
          *         |
          *         z
          */
-        this.quadIndex = new Vector3f[]{
-            new Vector3f(-1, 0, -1), new Vector3f(0, 0, -1), new Vector3f(1, 0, -1), new Vector3f(2, 0, -1),
-            new Vector3f(-1, 0, 0), new Vector3f(0, 0, 0), new Vector3f(1, 0, 0), new Vector3f(2, 0, 0),
-            new Vector3f(-1, 0, 1), new Vector3f(0, 0, 1), new Vector3f(1, 0, 1), new Vector3f(2, 0, 1),
-            new Vector3f(-1, 0, 2), new Vector3f(0, 0, 2), new Vector3f(1, 0, 2), new Vector3f(2, 0, 2)};
+        // generate a grid of quad positions
+        this.quadIndex = new Vector3f[getSubdivisionsPerSide() * getSubdivisionsPerSide()];
+        int i = 0;
+        for (int z = -getSubdivisionsPerSide() / 2 + 1; z <= getSubdivisionsPerSide() / 2; z++) {
+            for (int x = -getSubdivisionsPerSide() / 2 + 1; x <= getSubdivisionsPerSide() / 2; x++) {
+                quadIndex[i++] = new Vector3f(x, 0, z);
+            }
+        }
 
     }
 
@@ -357,7 +365,7 @@ public class FineTerrainGrid extends TerrainQuad {
     }
     
     protected void removeQuad(TerrainQuad q) {
-        if (q != null && ( (q.getQuadrant() > 0 && q.getQuadrant()<5) || q.getParent() != null) ) {
+        if (q != null && ( q.getParent() != null) ) {
             for (TerrainGridListener l : listeners) {
                 l.tileDetached(getTileCell(q.getWorldTranslation()), q);
             }
@@ -372,7 +380,6 @@ public class FineTerrainGrid extends TerrainQuad {
      * @param shifted quads are still attached to the parent and don't need to re-load
      */
     protected void attachQuadAt(TerrainQuad q, int quadrant, Vector3f quadCell, boolean shifted) {
-        
         q.setQuadrant((short) quadrant);
         if (!shifted)
             this.attachChild(q);
@@ -386,7 +393,6 @@ public class FineTerrainGrid extends TerrainQuad {
             }
         }
         updateModelBound();
-        
     }
 
     
@@ -412,17 +418,17 @@ public class FineTerrainGrid extends TerrainQuad {
         }
 
         int xMin = 0;
-        int xMax = 4;
+        int xMax = getSubdivisionsPerSide();
         int yMin = 0;
-        int yMax = 4;
+        int yMax = getSubdivisionsPerSide();
         if (dx == -1) { // camera moved to -X direction
-            xMax = 3;
+            xMax = getSubdivisionsPerSide() - 1;
         } else if (dx == 1) { // camera moved to +X direction
             xMin = 1;
         }
 
         if (dy == -1) { // camera moved to -Y direction
-            yMax = 3;
+            yMax = getSubdivisionsPerSide() - 1;
         } else if (dy == 1) { // camera moved to +Y direction
             yMin = 1;
         }
@@ -432,7 +438,7 @@ public class FineTerrainGrid extends TerrainQuad {
         // either way in one of the axes (say X or Y axis) then they are all touched.
         for (int i = yMin; i < yMax; i++) {
             for (int j = xMin; j < xMax; j++) {
-                cache.get(camCell.add(quadIndex[i * 4 + j]));
+                cache.get(camCell.add(quadIndex[i * getSubdivisionsPerSide() + j]));
             }
         }
         

src/roadtrip/view/GameWorldView.java

@@ -16,6 +16,7 @@ import com.jme3.scene.Spatial;
 import com.jme3.terrain.geomipmap.*;
 import com.jme3.terrain.geomipmap.grid.FractalTileLoader;
 import com.jme3.terrain.geomipmap.lodcalc.DistanceLodCalculator;
+import com.jme3.terrain.geomipmap.lodcalc.LodCalculator;
 import com.jme3.terrain.noise.ShaderUtils;
 import com.jme3.terrain.noise.basis.FilteredBasis;
 import com.jme3.terrain.noise.filter.IterativeFilter;
@@ -35,7 +36,7 @@ import roadtrip.view.model.GameWorldState;
  */
 public class GameWorldView {
 
-    public static boolean DEBUG = false;//true;
+    public static boolean DEBUG = true;
     
     private final GameWorldState state;
 
@@ -157,10 +158,12 @@ public class GameWorldView {
         //terrain.terrainGrid.setLocalScale(2f, 1f, 2f);
         this.rootNode.attachChild(terrain.terrainGrid);
 
-        TerrainLodControl control = new FineTerrainGridLodControl(terrain.terrainGrid, camera);
-        control.setLodCalculator(new DistanceLodCalculator(patchSize + 1, 3.7f)); // patch size, and a multiplier
-        terrain.terrainGrid.addControl(control);
-
+        final TerrainLodControl lodControl = new FineTerrainGridLodControl(terrain.terrainGrid, camera);
+        lodControl.setLodCalculator(new DistanceLodCalculator(patchSize + 1, 3.7f)); // patch size, and a multiplier
+        terrain.terrainGrid.addControl(lodControl);
+        
+        final Spatial treeModel = assetManager.loadModel("Models/tree.j3o");
+        
         final FineTerrainGrid terrainGrid = terrain.terrainGrid;
         terrainGrid.addListener(new TerrainGridListener() {
 
@@ -170,6 +173,7 @@ public class GameWorldView {
 
             @Override
             public void tileAttached(Vector3f cell, TerrainQuad quad) {
+                lodControl.forceUpdate();
                 while(quad.getControl(RigidBodyControl.class)!=null){
                     quad.removeControl(RigidBodyControl.class);
                 }
@@ -180,7 +184,8 @@ public class GameWorldView {
 
                 String quadObjectsNodeKey = getQuadObjectsNodeKey(quad);
                 Node objects = new Node(quadObjectsNodeKey);
-                populateQuadObjectsNode(quad, objects);
+                // TODO: fix
+                //populateQuadObjectsNode(quad, objects);
                 rootNode.attachChild(objects);
             }
 
@@ -189,7 +194,6 @@ public class GameWorldView {
                 ProceduralMapQuadBlock mapQuadBlock = state.proceduralMap.getMapQuadBlock(quad);
 
                 // Add map objects (for now - trees)
-                Spatial treeModel = assetManager.loadModel("Models/tree.j3o");
                 //System.out.println("Grid @ " + terrainGrid.getLocalTranslation() + " s " + terrainGrid.getLocalScale());
                 //System.out.println("Quad " + quad.getName() + " @ " + quad.getLocalTranslation());
                 for (MapObjectInstance mapObject : mapQuadBlock.getMapObjects()) {
@@ -202,7 +206,7 @@ public class GameWorldView {
                     if (control != null) {
                         modelInstance.addControl(control);
                         control.setPhysicsLocation(pos);
-                        physicsSpace.add(control);
+                        //physicsSpace.add(control);
                     }
                     objects.attachChild(modelInstance);
                 }