fix Cinematic attach/detach/cleanup state

Author: capdevon

jme3-core/src/main/java/com/jme3/cinematic/Cinematic.java

@@ -362,6 +362,12 @@ public boolean isEnabled() {
      */
     @Override
     public void stateAttached(AppStateManager stateManager) {
+        for (CameraNode n : cameras.values()) {
+            if (n.getParent() == null) {
+                scene.attachChild(n);
+                logger.log(Level.INFO, "Attached CameraNode to the scene: {0}", n);
+            }
+        }
     }
 
     /**
@@ -372,6 +378,13 @@ public void stateAttached(AppStateManager stateManager) {
     @Override
     public void stateDetached(AppStateManager stateManager) {
         stop();
+
+        for (CameraNode n : cameras.values()) {
+            if (n.getParent() != null) {
+                scene.detachChild(n);
+                logger.log(Level.INFO, "Detached CameraNode from the scene: {0}", n);
+            }
+        }
     }
 
     /**
@@ -556,7 +569,6 @@ public void postRender() {
     @Override
     public void cleanup() {
         initialized = false;
-        clear();
     }
 
     /**
@@ -780,3 +792,4 @@ public void dispose() {
 }
 
 
+