@Override
    protected void setTransformRefresh() {
        refreshFlags |= RF_TRANSFORM;
        setBoundRefresh();
        for (Batch batch : batches.getArray()) {
            batch.geometry.setTransformRefresh();
        }
    }
SimpleBatchNode  comes with some restrictions, but can yield better performances.
Geometries to be batched has to be attached directly to the BatchNode
You can't attach a Node to a SimpleBatchNode
SimpleBatchNode is recommended when you have a large number of geometries using the 
same material that does not require a complex scene graph structure.

@see BatchNode
@author Nehon
jme3-core/src/main/java/com/jme3/scene/SimpleBatchNode.java