@Override
    protected void postQueue(RenderQueue renderQueue) {
        PreNormalCaching.getPreNormals(renderManager, normalPass, viewPort);
    }
Create a Screen Space Ambient Occlusion Filter from the given one (by copy).
@param cloneFrom the original filter.
jme3-vr/src/main/java/com/jme3/post/CartoonSSAO.java