public void setReflectionDisplace(float reflectionDisplace) {
        this.reflectionDisplace = reflectionDisplace;
        if (material != null) {
            material.setFloat("ReflectionDisplace", reflectionDisplace);
        }
    }
Sets the reflection displace. define how troubled will look the reflection in the water. default is 30

@param reflectionDisplace the desired displacement (default=30)
jme3-effects/src/main/java/com/jme3/water/WaterFilter.java