Added HideControl to hide eye-candy objects in the distance.

src/roadtrip/RoadTripPlanner.java

@@ -18,7 +18,7 @@ public class RoadTripPlanner extends SimpleApplication {
         app.start();
     }
 
-    public static boolean DEBUG = /*false;/*/true;/**/
+    public static boolean DEBUG = !true;/**/
 
     protected BulletAppState bulletAppState;
     private GameWorldState gameWorldState;

src/roadtrip/view/GameWorldView.java

@@ -264,6 +264,7 @@ public class GameWorldView {
                     }
                     modelInstance.setLocalTranslation(pos);
                     modelInstance.setLocalScale(scale);
+                    modelInstance.addControl(new HideControl());
                     objects.attachChild(modelInstance);
                 }
             }

src/roadtrip/view/HideControl.java

@@ -0,0 +1,77 @@
+package roadtrip.view;
+
+import java.util.ArrayList;
+import com.jme3.bounding.BoundingVolume;
+import com.jme3.renderer.Camera;
+import com.jme3.renderer.RenderManager;
+import com.jme3.renderer.ViewPort;
+import com.jme3.scene.Node;
+import com.jme3.scene.Spatial;
+import com.jme3.scene.control.AbstractControl;
+import com.jme3.scene.control.Control;
+
+public class HideControl extends AbstractControl
+{
+    private static final float DISTANCE_HIDE = 200;
+    
+    private ArrayList<Spatial> children;
+    private boolean hidden;
+    
+    private BoundingVolume prevBv;
+
+    @Override
+    public Control cloneForSpatial(Spatial spatial)
+    {
+        // TODO
+        return null;
+    }
+
+    @Override
+    protected void controlRender(RenderManager rm, ViewPort vp)
+    {
+        Camera cam = vp.getCamera();
+        BoundingVolume bv = spatial.getWorldBound();
+
+        if (bv == null) {
+            bv = prevBv;
+        } else {
+            prevBv = bv;
+        }
+
+        float distance = bv.distanceTo(cam.getLocation());
+
+        if (distance > HideControl.DISTANCE_HIDE) {
+            if (!hidden) {
+                for (int i = 0; i < children.size(); i++) {
+                    children.get(i).removeFromParent();
+                }
+                spatial.updateGeometricState();
+                hidden = true;
+            }
+        } else {
+            if (hidden) {
+                for (int i = 0; i < children.size(); i++) {
+                    ((Node) spatial).attachChild(children.get(i));
+                }
+            }
+            spatial.updateGeometricState();
+            hidden = false;
+        }
+    }
+
+    @Override
+    protected void controlUpdate(float tpf)
+    {
+    }
+
+    @Override
+    public void setSpatial(Spatial spatial)
+    {
+        if (!(spatial instanceof Node)) {
+            throw new IllegalArgumentException("only Node type is supported");
+        }
+        super.setSpatial(spatial);
+
+        children = new ArrayList<>(((Node) spatial).getChildren());
+    }
+}