@Override
    public void clearTextureAtlas(final int atlasId) {
        initialData.rewind();
        getTextureAtlas(atlasId).getImage().setData(initialData);
    }
Nifty GUI BatchRenderBackend Implementation for jMonkeyEngine.

@author void
jme3-niftygui/src/main/java/com/jme3/niftygui/JmeBatchRenderBackend.java