BatchNode now properly unbatch subgraph when a Node is removed from it

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@10112 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/core/com/jme3/scene/BatchNode.java

@@ -247,6 +247,34 @@ public class BatchNode extends Node implements Savable {
         }
     }
 
+    //in case the detached spatial is a node, we unbatch all geometries in its subegraph
+    @Override
+    public Spatial detachChildAt(int index) {
+        Spatial s = super.detachChildAt(index);
+        if (s instanceof Node) {
+            unbatchSubGraph(s);
+        }
+        return s;
+    }
+
+    /**
+     * recursively visit the subgraph and unbatch geometries
+     * @param s 
+     */
+    private void unbatchSubGraph(Spatial s) {
+        if (s instanceof Node) {
+            for (Spatial sp : ((Node) s).getChildren()) {
+                unbatchSubGraph(sp);
+            }
+        } else if (s instanceof Geometry) {
+            Geometry g = (Geometry) s;
+            if (g.isBatched()) {
+                g.unBatch();
+            }
+        }
+    }
+    
+    
     private void gatherGeomerties(Map<Material, List<Geometry>> map, Spatial n, boolean rebatch) {
 
         if (n instanceof Geometry) {