RenderManager : Changed renderScene to reset the camera plane state to 0 (the first node to render is not always a root, it can be a sub part of the scene graph) and call renderSubScene.

Created a private method renderSubScene that recursively renders the scene graph.
This fixes culling issues with the reflection/redraction processors for the water effects se this post
http://jmonkeyengine.org/groups/graphics/forum/topic/possibly-bug-simplewater-postprocessor-renders-entire-scene-no-frustrum-of-objects/?#post-192561

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@9790 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/core/com/jme3/renderer/RenderManager.java

@@ -636,9 +636,15 @@ public class RenderManager {
      * contain the flattened scene graph.
      */
     public void renderScene(Spatial scene, ViewPort vp) {
-        if (scene.getParent() == null) {
+        //reset of the camera plane state for proper culling (must be 0 for the first note of the scene to be rendered)
-            vp.getCamera().setPlaneState(0);
+        vp.getCamera().setPlaneState(0);
-        }
+        //rendering the scene
+        renderSubScene(scene, vp);
+    }
+    
+    // recursively renders the scene
+    private void renderSubScene(Spatial scene, ViewPort vp) {
+
         // check culling first.
         if (!scene.checkCulling(vp.getCamera())) {
             // move on to shadow-only render
@@ -658,7 +664,7 @@ public class RenderManager {
             for (int i = 0; i < children.size(); i++) {
                 // Restoring cam state before proceeding children recusively
                 vp.getCamera().setPlaneState(camState);
-                renderScene(children.get(i), vp);
+                renderSubScene(children.get(i), vp);
             }
         } else if (scene instanceof Geometry) {
             // add to the render queue