public void setUseSpecular(boolean useSpecular) {
        this.useSpecular = useSpecular;
        if (material != null) {
            material.setBoolean("UseSpecular", useSpecular);
        }
    }
Set to true to use specular lighting on the water

@param useSpecular true to enable the specular effect, false to disable
it (default=true)
jme3-effects/src/main/java/com/jme3/water/WaterFilter.java