public void setReduceMul(float reduceMul) {
        this.reduceMul = reduceMul;
        if (material != null) {
            material.setFloat("ReduceMul", this.reduceMul);
        }
    }
set to 0.0f for higher quality

@param reduceMul the desired value (default=0.125)
jme3-effects/src/main/java/com/jme3/post/filters/FXAAFilter.java