public void setNormalThreshold(float normalThreshold) {
        this.normalThreshold = normalThreshold;
        if (material != null) {
            material.setFloat("NormalThreshold", normalThreshold);
        }
    }
sets the normal threshold default is 0.5

@param normalThreshold the desired threshold (default=0.5)
jme3-effects/src/main/java/com/jme3/post/filters/CartoonEdgeFilter.java