public void setApproximateNormals(boolean approximateNormals) {
        this.approximateNormals = approximateNormals;
        if (ssaoMat != null) {
            ssaoMat.setBoolean("ApproximateNormals", approximateNormals);
        }
    }
debugging only , will be removed

@param useAo true to enable, false to disable (default=true)
jme3-effects/src/main/java/com/jme3/post/ssao/SSAOFilter.java