@Override
    protected void cleanUpFilter(Renderer r) {
        normalPass.cleanup(r);
    }
Create a Screen Space Ambient Occlusion Filter
@param sampleRadius The radius of the area where random samples will be picked. default 5.1f
@param intensity intensity of the resulting AO. default 1.2f
@param scale distance between occluders and occludee. default 0.2f
@param bias the width of the occlusion cone considered by the occludee. default 0.1f
jme3-effects/src/main/java/com/jme3/post/ssao/SSAOFilter.java